Enterasys Networks RBT-4102 manuale d’uso

Enterasys RoamAbout ® Wir eless Networking RBT -4102 W ireless Access Point Configuration Guide P/N 9034186-05[...]

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i Notice Enterasys Networks  reserves  the  right  to  make  changes  in  specifications  and  other  information  contained  in  this  document  and  its  web  si te  without  prior  notice.  The  reader  should  in  all  cases  co nsult  Enterasys Netw orks [...]

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iii If  the  Program  is  exported  from  the  United  Stat es  pursuant  to  the  License  Ex ception  TSR  und er  the  U.S.  Export  Administration  Regulations,  in  addition  to  the  restriction  on  transfer  se t  fort h  in  Section  1  or ?[...]

iv 11. ASSIGNMENT. You  may  not  assign,  transfer  or  sublicense  this  Agreement  or  any  of  Your  rights  or  obligations  un der  this  Agreement,  except  that  You  may  assign  this  Agreement  to  any  person  or  entit y  which  acquires [...]

v Enterasys Networks, Inc. Software Li cense Agreement This  document  is  an  agreement  (“ Agreement”)  betwee n  Yo u ,  the  end  user,  and  Enterasys  Networks,  Inc.  on  behalf  of  itse lf  and  its  Affiliates  (“Enterasys”)  that  sets  forth  your  [...]

vi to  Enterasys. 5. PROTECTION  AND  SECURITY .I n  the  performance  of  this  Agreement  or  in  contemplation  thereof,  You  and  your  employees  and  agents  may  have  acce ss  to  private  or  confidential  information  owned  or  cont rolled  by  [...]

vii 9. UNITED  STATES  GOVERNMENT  RESTRICTED  RIGHTS .T h e  Licensed  Mate rials  (i)  were  developed  sol ely  at  private  expense;  (ii)  contains  “restricted  computer  software”  submitted  with  restri cted  rights  in  accordance  with  section  52 .227 [...]

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ix Contents Preface Purpose of This Manual .. .... ............. ... ... ... .... ............ .... ... ... ... ............. .... ... ... ... ... ............. .... . .. ................ ......... xiii Intended Audience .......... ............. ................. ............ ................. ............. ................ ........... ........ ...[...]

x Using Web Management to Configure Authentication ........ ............. ...... .......... ............. ............ ............. 4-1 6 Using the CLI to Configure Authentication ......... ............. ................. ............ ............. ............. ........ ........ 4-17 Filter Control and VLANs ....... ............. ................[...]

xi Security ............... ................ ................ ................ ................ ................ ................ ....... ................... ............. ... 4-78 Wired Equivalent Privacy (WEP) .. ................... ... ....... ................ ............. ............. ............. .......... ............ 4-79 Using Web Manag[...]

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RoamAbout RBT-4102 Wireless Access Point Configuration Guide xiii Preface Purpose of This Manual This  manual  provides  configuration  instructions  for  the  RoamAbout  RBT ‐ 4102  Access  Poi n t  using  We b  management  and  the  Command  Line  Interface  (CLI).  For  complete ?[...]

xiv Preface The  following  conventions  are  used  in  the  text  of  this  document: Getting Help For  additional  support  related  to  this  device  or  document,  contact  Enterasys  Networks  using  one  of  the  following  methods. Before  calling  Enteras[...]

RoamAbout RBT-4102 Wireless Access Point Con figuration Guide 1-1 1 Introduction Overview The  RoamAbout  RBT ‐ 4102 ,  RBT ‐ 4102 ‐ BG,  and  RBT ‐ 4102 ‐ EU,  are  IEEE  802.11a/b/g  access  points  that  provide  transparent,  wireless  high ‐ speed  data  communications  betw een[...]

Features 1-2 Introduction Features The  features  and  benefits  of  the  RBT ‐ 4102  include  the  following: •L o c a l  network  connection  via  10/100  Mbps  Ethernet  ports  or  54  Mbps  wireless  interface  (supporting  up  to  255  mobile  users  per ?[...]

Applications RoamAbout RBT-4102 Wireless Access Point Con figuration Guide 1-3 The  supported  functions  allow  a  security  administrator  to  configure  the  RBT ‐ 4102  as  follows: •G r a n t  restricted  access  to  an  un ‐ authenticated  guest  user . •G r a n t  access [...]

Applications 1-4 Introduction[...]

RoamAbout RBT-4102 Wireless Access Point Con figuration Guide 2-1 2 Network Configuration Overview The  wireless  solution  supports  a  stand ‐ alone  wire less  netw ork  configuration  as  wel l  as  an  integrated  configuration  with  10/100 Mbps  Ethernet  LANs. Wi r e l e s s  networ[...]

Network Topologies 2-2 Network Configuration Network T opologies Ad Hoc Wireless LAN (no Access Point or Bridge) An  ad  hoc  wirel ess  LAN  consists  of  a  group  of  computers,  each  equipped  with  a  wire less  adapter ,  connected  via  radio  signals  as  an  independent [...]

Network Topologies RoamAbout RBT-4102 Wireless Access Point Con figuration Guide 2-3 Infrastructure Wireless LAN The  access  point  also  provides  access  to  a  wired  LAN  for  wireless  workstations.  An  int egrated  wired/wireless  LAN  is  called  an  infrastructure  configurati[...]

Network Topologies 2-4 Network Configuration Infrastructure Wireless LAN for Roaming Wireless PCs The  Basic  Service  Se t  (BSS)  defines  the  communications  domain  for  each  access  point  and  its  associated  wireless  clients.  The  BSS  ID  is  a  48 ‐ bit  binary [...]

Network Topologies RoamAbout RBT-4102 Wireless Access Point Con figuration Guide 2-5 Infrastructure Wireless Bridge The  IEEE  802.11  standard  defines  a  Wi re l e s s  Distribution  System  (WDS)  for  bridge  connections  between  BSS  areas  (access  points).  The  access  point  [...]

Network Topologies 2-6 Network Configuration[...]

RoamAbout RBT-4102 Wireless Access Point Con figuration Guide 3-1 3 Initial Configuration Overview Yo u  can  manage  the  Enterasys  RoamAbout  RBT ‐ 4102  with: •T h e  Command  Line  Interface  (CLI)  accessed  through  a  direct  co nnection  to  the  console  po rt. For  a  [...]

Initial Setup Using the CLI 3-2 Initial Configuration •  Set  the  emulation  mo de  to  VT100. •  When  using  HyperT erminal,  select  Te r m i n a l  keys,  not  Wi ndows  keys. 4. Once  you  have  set  up  the  terminal  correctly ,  press  the  Enter  key ?[...]

Initial Setup Using the CLI RoamAbout RBT-4102 Wireless Access Point Con figuration Guide 3-3 RICO, QA-QATAR, RO-ROMANIA, RU-RUSSIA, SA-SAUDI ARABIA, SG -SINGAPORE, SK-SLOVAK REPUBL IC, SI-SLOVENIA, ZA-SOUTH AFRICA, ES -SPAIN, SE-SWEDEN, CH-SWITZERLAND, SY-SYRIA, TW-TAIWAN, TH-THAILAND, TT-TRINIDAD & TOBAGO, TN-TUNISIA, TR-TURKEY, UA-UKRAINE, A[...]

Initial Setup Using the CLI 3-4 Initial Configuration 4. Change  the  default  username  and  password:  ty pe  username  and  specify  a  unique  user  name;  type  password  and  specify  a  unique  passw ord. RoamAbout 4102(config)#username Kare nBD RoamAbout 4102(config)#password **** [...]

Initial Setup Using the CLI RoamAbout RBT-4102 Wireless Access Point Con figuration Guide 3-5 . •  If  applicable,  the  Count y  Code  page  appears,  go  to  step  3. •  If  the  Country  Code  page  does  not  appear ,  go  to  st ep  4. 3. If  applicable,  set [...]

Initial Setup Using the CLI 3-6 Initial Configuration ```` c. Click  the  Reset  button  next  to  Reset  Access  Poi n t ,  located  at  the  bottom  of  the  page. The  access  point  prompts  you  to  confirm  that  you  wa n t  to  reboot  the  system. d. Click [...]

Initial Setup Using the CLI RoamAbout RBT-4102 Wireless Access Point Con figuration Guide 3-7 4. Enter  the  following  information,  and  click  Apply . •  System  Name  is  an  alias  used  for  the  access  point,  enabling  the  device  to  be  uniquely  identified  on[...]

Initial Setup Using the CLI 3-8 Initial Configuration b. Click  the  DHCP  Client:  Disable  radio  button.  DHCP  allows  you  to  enable  or  disable  the  option  to  obtain  the  IP  settings  for  the  access  point  from  a  DHCP  (Dynamic  Host  Configu[...]

Initial Setup Using the CLI RoamAbout RBT-4102 Wireless Access Point Con figuration Guide 3-9 f. Click  Administration  from  the  menu  on  the  left ‐ hand  sid e  of  the  page. The  Administration  page  appears. g. Click  the  Reset  button  next  to  Reset  Access  Poi n t , [...]

Initial Setup Using the CLI 3-10 Initial Configuration c. Specify  a  new  password  in  the  Pas sw o r d  field. d. Specify  the  new  password  again  in  the  Confirm  Pa s s wo r d  field. e. Click  Apply  at  the  bottom  of  the  page. The  access  point  displays [...]

RoamAbout RBT-4102 Wireless Access Point Con figuration Guide 4-1 4 Advanced Configuration Overview This  chapter  presents  adv anced  config uration  information  organized  according  to  the  structure  of  the  web  interface  for  easy  refere nce. Enterasys  Netw orks  recommends  t[...]

Overview 4-2 Advanced Configuration SNMP Controls access to this access point from management stations using SNMP , as well as the hosts that will receive trap messages. 4-30 Administration Configures user name and password for management access; upgrades software fro m local file, F TP , or TFTP ser ver; resets configuration settings to factory de[...]

Identification RoamAbout RBT-4102 Wireless Access Point Con figuration Guide 4-3 Identification Using W eb Management to Co nfigure System Information The  system  information  parameters  for  the  RBT ‐ 4102  can  be  left  at  the ir  def ault  settings.  However ,  modifying  these  parameter[...]

Identification 4-4 Advanced Configuration Using the CLI to Configure System Information From  the  config  mode,  use  the  system  name  command  to  specify  a  new  system  name.  Th en  return  to  the  Executive  mode,  and  use  the  show  system  command  to [...]

TCP / IP Settings RoamAbout RBT-4102 Wireless Access Point Con figuration Guide 4-5 TCP / IP Settings Configuring  the  RBT ‐ 4102  with  an  IP  address  expands  your  ability  to  manage  the  access  point.  A  number  of  access  point  features  depend  on  IP  addres s[...]

TCP / IP Settings 4-6 Advanced Configuration Using W eb Management to Configure TCP/IP Select  TCP/IP  Settings  from  the  menu. •D H C P  allows  you  to  enable  or  disable  the  option  to  obtain  the  IP  settings  for  the  access  point  from  a  DHCP  (Dynamic[...]

TCP / IP Settings RoamAbout RBT-4102 Wireless Access Point Con figuration Guide 4-7 If  you  have  management  stations,  DNS,  RADIUS,  or  other  netw ork  serve rs  located  on  another  subnet,  type  the  IP  address  of  the  default  gatew ay  router  in  the  text[...]

TCP / IP Settings 4-8 Advanced Configuration •E t h e r n e t  Settin gs  The  Ethernet  Settings  options  let  you  control  the  speed  and  duplex  setting  as  wel l  as  the  auto ‐ negotiation  state  of  the  Ethernet  port. – Auto  Negotiate  disables  or ?[...]

TCP / IP Settings RoamAbout RBT-4102 Wireless Access Point Con figuration Guide 4-9 Untagged VlanId : 1 ==================================== ==== RoamAbout 4102# SSH Configuration To  enable  the  SSH  server ,  use  the  ip  ssh ‐ server  enable  command  from  the  CLI  Ethern et  interface  confi[...]

TCP / IP Settings 4-10 Advanced Configuration Auto Negotiate : Disable Speed-duplex(Admin) : 100Base-TX Ful l Duplex Speed-duplex(Oper) : 100Base-TX Ful l Duplex ==================================== ==== test4102(if-ethernet)#[...]

RADIUS RoamAbout RBT-4102 Wireless Access Point Configur ation Guide 4-11 RADIUS Remote  Authentication  Dial ‐ in  User  Service  (RADIUS)  is  an  authe ntication  protocol  that  uses  software  running  on  a  central  server  to  control  access  to  RADI US ‐ aw are  dev[...]

RADIUS 4-12 Advanced Configuration Using W eb Management to Configure RADIUS Select  RADIUS  from  the  menu. •P r i m a r y  Radius  Server  Setup  configures  the  following  settings  to  use  RADIUS  authentication  on  the  access  point: – IP  Addr ess/Server  Nam e  specif[...]

RADIUS RoamAbout RBT-4102 Wireless Access Point Configur ation Guide 4-13 – RADIUS  Accounting  enables  or  disables  the  AP  to  send  RADIUS  accounting  information  for  clients  to  the  RADIUS  accounting  serv er .  Default:  Disable – Accounting  Port  specifies  the[...]

RADIUS 4-14 Advanced Configuration Using the CLI to Configure RADIUS From  the  global  configuration  mode,  use  the  radius ‐ server  address  command  to  specify  the  address  of  the  primary  RADIUS  serv er ,  or  the  radius ‐ server  secondary  address  command ?[...]

Authentication RoamAbout RBT-4102 Wireless Access Point Configur ation Guide 4-15 Authentication Wi r e l e s s  clients  can  be  authenticated  for  network  access  by  checking  their  MAC  address  against  the  local  database  configured  on  the  access  point,  or  by [...]

Authentication 4-16 Advanced Configuration Using W eb Management to Configure Authenti cation Select  Authenticat ion  from  the  menu. • 802.1x  Supplicant  allows  you  to  ena ble  or  disable  the  access  point  as  an  802.1x  authentication  supplicant  to  authenticate  wit[...]

Authentication RoamAbout RBT-4102 Wireless Access Point Configur ation Guide 4-17 Using the CLI to Configu re Authentication Use  the  802.1x  supplicant  user  command  from  the  global  configuration  mode  to  specify  the  username  and  password  that  the  access  points  uses ?[...]

Filter Control and VLANs 4-18 Advanced Configuration Filter Control and VLANs The  access  point  can  employ  VLAN  ID  and  network  traffic  frame  filterin g  to  control  access  to  network  resources  and  increase  security .  Yo u  can  prevent  communica tions  bet[...]

Filter Control and VLANs RoamAbout RBT-4102 Wireless Access Point Configur ation Guide 4-19 • Management  VLAN  ID  specifies  the  management  VLAN  ID  for  the  access  point. The  management  VLAN  is  for  managing  the  access  point.  For  example,  the  access  point [...]

Filter Control and VLANs 4-20 Advanced Configuration Using the CLI to Configure Filter Control and VLANs CLI Commands for VLAN Support From  the  global  configuration  mode,  use  the  management ‐ vlanid  command  to  set  the  default  Management  VLAN  ID  for  the  Ethernet  inte rface[...]

Filter Control and VLANs RoamAbout RBT-4102 Wireless Access Point Configur ation Guide 4-21 From  the  interface  ethernet  mode,  use  the  untagged ‐ vlanid  to  specify  a  VLAN  ID  for  the  AP  to  use  for  untagged  packets  entering  thr ough  the  AP’ s  Ethern[...]

Filter Control and VLANs 4-22 Advanced Configuration CLI Commands for Filtering Use  the  filter  ibss ‐ relay  command  from  the  global  conf iguration  to  set  the  mode  for  wireless ‐ to ‐ wireless  communications  th rough  the  access  point .  Use  the  filter  wi[...]

Filter Control and VLANs RoamAbout RBT-4102 Wireless Access Point Configur ation Guide 4-23 SVP Commands To  enable  SVP ,  from  the  global  configuration  mode,  use  the  svp  command.  To  disable  SVP ,  us e  the  no  ver si o n  of  the  command.  Use  the  show  svp[...]

CDP Settings 4-24 Advanced Configuration CDP Settings Cabletron  Discove ry  Protocol  (CDP)  settings  control  how  the  AP  uses  CDP  to  discov er  neighbors  on  the  physical  LAN  to  which  it  connects.  Using W eb Management to Configure CDP Select  CDP  Settings [...]

CDP Settings RoamAbout RBT-4102 Wireless Access Point Configur ation Guide 4-25 •P o r t  Status:  – Disable ‐ di sables  this  AP  from  using  CDP .  – Enable ‐ enables  this  AP  to  use  CDP  and  to  send  information  about  itself  at  the  specified  [...]

CDP Settings 4-26 Advanced Configuration Using the CLI to Configure CDP From  the  global  configuration  mode,  enable  cdp  with  the  cdp  auto ‐ enable  or  cdp  enable  commands.  Specify  the  hold  time,  transmit  frequency  and  optionally  an  authenticati on  co[...]

Rogue AP Detection RoamAbout RBT-4102 Wireless Access Point Configur ation Guide 4-27 Rogue AP Detection This  feature  scans  the  airw aves  and  collects  information  about  access  points  in  the  area. The  term  “rogue  AP”  is  used  to  describe  an  access  point ?[...]

Rogue AP Detection 4-28 Advanced Configuration • RADIUS  Authentication  enables  the  access  point  to  discove r  rogue  access  points.  Enabling  RADIUS  Authentication  causes  the  access  point  to  check  the  MAC  address/Basic  Service  Set  Identifier  (BSSI[...]

Rogue AP Detection RoamAbout RBT-4102 Wireless Access Point Configur ation Guide 4-29 802.11a : Rogue AP Status No. AP Address(BSSID) SSID Channel(MHz) RSSI Encr. IB SS ==================================== ==================================== 802.11b/g : Rogue AP Setting ==================================== =========================================[...]

SNMP 4-30 Advanced Configuration SNMP The  access  point  includes  an  on ‐ board  agent  that  supports  SNMP  v ersions  1,  2c,  and  3.  Access  to  the  on ‐ board  agent  using  SNMP  v1  and  v2c  is  controlled  by  co mmunity  strings.  To  co[...]

SNMP RoamAbout RBT-4102 Wireless Access Point Configur ation Guide 4-31 • SNMP  allows  you  to  enable  or  disable  SNMP  management  access  and  also  enables  the  access  point  to  send  SNMP  traps  (notifications).  SNMP  management  is  enabled  by  default. ?[...]

SNMP 4-32 Advanced Configuration • Engine ‐ ID  is  used  for  SNMP v3  to  identify  the  access  point  in  a  netw ork  of  multiple  access  points.  –E n t e r i n g  the  Engine ‐ ID  invalidates  all  engine  IDs  that  hav e  been  previously  config[...]

SNMP RoamAbout RBT-4102 Wireless Access Point Configur ation Guide 4-33 – User  specifies  string  to  identify  an  SNMP  user .  (32  characters  maximum) – Group  is  th e  name  of  the  SNMP  group  to  which  the  user  is  as signed  (32  characters  maximum). [...]

SNMP 4-34 Advanced Configuration •S N M P  Ta r g e t s – Ta r g e t  ID  is  the  name  you  enter  to  identify  the  SNMP  target.  Maximum:  32  characters – IP  Address  is  the  IP  address  of  the  use r .  – UDP  port  is  the  UDP  port  of ?[...]

SNMP RoamAbout RBT-4102 Wireless Access Point Configur ation Guide 4-35 Using the CLI to Configure SNMP The  access  point  includes  an  on ‐ board  agent  that  supports  SNMP  v ersions  1,  2c,  and  3.  Access  to  the  on ‐ board  agent  using  SNMP  v1  and  v2c  [...]

SNMP 4-36 Advanced Configuration localMacAddrAuthSuccess Enabled pppLogonFail Enabled sntpServerFail Enabled radiusServerChanged Enabled systemDown Enabled systemUp Enabled ==================================== ========= RoamAbout 4102# CLI Commands for Configur ing SNMPv3 Users and Groups Use  the  snmp ‐ server  engine ‐ id  comman[...]

SNMP RoamAbout RBT-4102 Wireless Access Point Configur ation Guide 4-37 Passphrase:**************** PrivType :DES Passphrase:**************** ==================================== ========= RoamAbout 4102#show snmp group-assig nments GroupName :TPS UserName :chris RoamAbout 4102#[...]

SNMP 4-38 Advanced Configuration CLI Commands for Conf iguring SNMPv3 T argets To  create  a  notification  target,  use  the  snmp ‐ server  targets  command  from  the  CLI  configuration  mode.  To  assign  a  filter  to  a  target,  use  the  snmp ‐ server  filter ?[...]

Administration RoamAbout RBT-4102 Wireless Access Point Configur ation Guide 4-39 Administration Changing the Password Management  access  to  the  We b  and  CLI  interface  on  the  RBT ‐ 4102  is  controlled  through  a  single  user  name  and  password.  Yo u  can  also  ga[...]

Administration 4-40 Advanced Configuration Using Web Management to Change the Password Select  Administration  from  the  menu. • Change  Username/Password  A  username  and  passw ord  are  required  to  configure  the  access  point.  Enterasys  Netw orks  strongly  recommends  that[...]

Administration RoamAbout RBT-4102 Wireless Access Point Configur ation Guide 4-41 Using the CLI to Ch ange the Password Use  the  username  and  password  commands  from  the  CLI  configurat ion  mode. Example RoamAbout 4102(config)#username John RoamAbout 4102(config)#password **** RoamAbout 4102(config)#confirm pass[...]

Administration 4-42 Advanced Configuration Upgrading Firmware Yo u  can  upgrade  the  RBT ‐ 4102  softwar e  from  a  local  file  on  the  management  workstation,  or  from  an  FT P  or  TF TP  serv er .  New  softw are  may  be  provided  periodically  on  th[...]

Administration RoamAbout RBT-4102 Wireless Access Point Configur ation Guide 4-43 Using Web Management to Upgrade Firmware • Curr ent  version  displays  the  ve rs io n  number  of  code. • Local  downloads  an  operation  code  image  file  from  the  We b  management  station  to  t[...]

Administration 4-44 Advanced Configuration Using the CLI to Upgrade F irmware To  download  softw are  from  a  TF TP/F TP  Serv er ,  use  the  copy  command  from  the  Ex ecutive  mode .  The  copy  command  requires  you  to  specify  ei ther  the  file  type  and [...]

System Log RoamAbout RBT-4102 Wireless Access Point Configur ation Guide 4-45 System Log The  RBT ‐ 4102  can  be  configured  to  send  event  an d  error  messages  to  a  System  Log  Serve r .  The  system  clock  can  also  be  synchronized  with  a  time  server ,[...]

System Log 4-46 Advanced Configuration • Logging  Level  sets  the  severity  level  for  event  logging. • Logging  Facility ‐ T ype  specifies  the  sys log  facility  to  use  for  messages,  (16  to  23)  local  0  to  local  7. The  system  allows  you ?[...]

System Log RoamAbout RBT-4102 Wireless Access Point Configur ation Guide 4-47 Using the CLI to Configure System Log To  enable  logging  on  the  access  point ,  use  the  logging  on  command  from  the  gl obal  configuration  mode.  The  logging  level  command  sets  the  min[...]

System Log 4-48 Advanced Configuration Using W eb Management to Configure SNTP Simple  Network  Time  Protocol  (SNTP)  allows  the  RBT ‐ 4102  to  set  its  internal  clock  bas ed  on  periodic  updates  from  a  time  server .  Ma intaining  an  accurate  time  on  [...]

System Log RoamAbout RBT-4102 Wireless Access Point Configur ation Guide 4-49 Using the CLI to Configure SNTP To  enable  SNTP  support  on  the  access  point,  from  the  global  configuration  mode  specify  SNTP  server  IP  addresses  using  the  sntp ‐ server  ip  command, ?[...]

WDS and STP 4-50 Advanced Configuration WDS and STP Each  access  po int  radio  int erface  can  be  configured  to  operate  in  a  bridge  mode,  which  allows  it  to  forw ard  traffic  directly  to  other  access  point  units.  To  set  up  bridge  link[...]

WDS and STP RoamAbout RBT-4102 Wireless Access Point Configur ation Guide 4-51 Using W eb Management to Configure WDS and STP Select  WDS  &  STP  from  th e  menu.[...]

WDS and STP 4-52 Advanced Configuration • WDS  Bridge  allows  you  to  specify  up  to  eight  WDS  bridge  links  (MAC  addr esses)  per  radio  interface  for  each  unit  in  the  wireless  bridge  network.  One  unit  must  be  configured  as  the ?[...]

WDS and STP RoamAbout RBT-4102 Wireless Access Point Configur ation Guide 4-53 ‐ Range:  0 ‐ 65535 ‐ Default:  32768 – Bridge  Max  Age  is  the  maximum  time  (in  seconds)  a  device  can  wa i t  without  receiving  a  configuration  message  before  attempting  to  re[...]

WDS and STP 4-54 Advanced Configuration Using the CLI to Configure WDS To  set  the  role  of  the  access  point  radio  interface,  use  the  bridge  role  command  from  the  CLI  wireless  interface  configuration  mode.  Then,  configure  the  MAC  addresses  of ?[...]

WDS and STP RoamAbout RBT-4102 Wireless Access Point Configur ation Guide 4-55 Using the CLI to Configure STP If  a  radio  interface  is  set  to  the  Bridge  or  Root  Bridge  role ,  STP  can  be  enabled  on  the  access  point  to  maintain  a  val id  network  topo[...]

Radio Interface 4-56 Advanced Configuration Radio Interface The  IEEE  802.11a  and  802.11b/g  interfaces  include  configuration  options  for  radio  signa l  characteristics,  Vir t u a l  APs  (V AP s),  and  wireless  security  features.  The  configuration  options  for [...]

Radio Interface RoamAbout RBT-4102 Wireless Access Point Configur ation Guide 4-57 Radio Settings Using Web Management to Conf igure Interface Radio Settings Select  Radio  Settings  under  the  type  of  interface  (802.11a  or  802.11b/g)  that  you  wan t  to  configure.  • Interface  Status ?[...]

Radio Interface 4-58 Advanced Configuration • Native  VLAN  ID  is  the  VLAN  ID  for  this  default  radio  interface.  The  access  point  assigns  this  VLAN  ID  to  all  client  traffic  us ing  this  radio  interface  unless  you  assign  unique  V[...]

Radio Interface RoamAbout RBT-4102 Wireless Access Point Configur ation Guide 4-59 – Right .  The  radio  only  uses  the  antenna  on  the  right  si de  (the  side  closest  to  the  access  poin t  LEDs).  Select  this  method  when  using  an  optional  external [...]

Radio Interface 4-60 Advanced Configuration –T h e  802.11b/g  radio  channel  that  the  access  point  uses  to  communicate  with  wirel ess  clients.  When  multiple  access  points  are  deploy ed  in  the  same  ar ea,  set  the  channel  on  neighboring [...]

Radio Interface RoamAbout RBT-4102 Wireless Access Point Configur ation Guide 4-61 faster .  Using  higher  DTIM  va l u e s  reduces  the  pow er  used  by  stations  in  Pow e r  Save  mode,  but  delays  the  transmission  of  broadcast/multicast  frames.  Range:  1 ‐ 255 [...]

Radio Interface 4-62 Advanced Configuration Using the CLI to Configure th e 802.1 1a Interface Radio Settings From  the  global  configuration  mode,  enter  the  interface  wireless  a  comm and  to  access  the  802.11a  radio  interface.  Set  the  interface  SSID  using  the  [...]

Radio Interface RoamAbout RBT-4102 Wireless Access Point Configur ation Guide 4-63 To  view  the  current  802.11a  radio  settings,  use  the  show  interface  wireless  a  command. Example RoamAbout 4102#show interface wirele ss a Wireless Interface Information ==================================== ==========[...]

Radio Interface 4-64 Advanced Configuration Ad mission Control: No TX OP Limit: 0.000 ms AC2(Video) : lo gCwMin: 3 logCwMax: 4 AIFSN: 2 Ad mission Control: No TX OP Limit: 3.008 ms AC3(Voice) : lo gCwMin: 2 logCwMax: 3 AIFSN: 2 Ad mission Control: No TX OP Limit: 1.504 ms WMM AP Parameters AC0(Best Effort) : lo gCwMin: 4 logCwMax: 6 AIFSN: 3 Ad mis[...]

Radio Interface RoamAbout RBT-4102 Wireless Access Point Configur ation Guide 4-65 Using the CLI to Configure the 802.1 1b/g Interface Radio Settings From  the  global  configuration  mode,  enter  the  interface  wireless  g  command  to  access  th e  802.11g  radio  interface.  Set  the  i[...]

Radio Interface 4-66 Advanced Configuration To  view  the  current  802.11g  radio  settings,  use  the  show  interface  wirel ess  g  command. Example RBT4102-230.101#show int wireless g Wireless Interface Information ==================================== ===================================== ----------------[...]

Radio Interface RoamAbout RBT-4102 Wireless Access Point Configur ation Guide 4-67 TX OP Limit: 0.000 ms AC1(Background) : lo gCwMin: 4 logCwMax: 10 AIFSN: 7 Ad mission Control: No TX OP Limit: 0.000 ms AC2(Video) : lo gCwMin: 3 logCwMax: 4 AIFSN: 2 Ad mission Control: No TX OP Limit: 3.008 ms AC3(Voice) : lo gCwMin: 2 logCwMax: 3 AIFSN: 2 Ad missi[...]

Radio Interface 4-68 Advanced Configuration Wi-Fi Multimedia (WMM) Configuration Wi r e l e s s  networks  offer  an  equal  opportunity  for  all  devices  to  transmit  data  from  any  type  of  application.  Although  this  is  accepta ble  for  most  applications,  multime[...]

Radio Interface RoamAbout RBT-4102 Wireless Access Point Configur ation Guide 4-69 After  a  collision  detection,  a  backoff  wa i t  time  is  calculated.  The  total  wai t  time  is  the  sum  of  a  minimum  wai t  time  (Arbitration  Inter ‐ Frame  Space,  or  AI[...]

Radio Interface 4-70 Advanced Configuration – Support :  WMM  will  be  used  for  any  associated  device  that  supports  this  feature.  Devices  that  do  not  support  this  feature  may  still  associate  with  the  access  point. – Required :  WMM  must ?[...]

Radio Interface RoamAbout RBT-4102 Wireless Access Point Configur ation Guide 4-71 ----------------Antenna------------- ------------------------------------- Antenna Select : Fi xed Fixed Antenna Control : Di versity Antenna ID : 0x 0000(Integrated antenna) Ack-TimeOut : 0 us ----------------802.11 Parameters--- ------------------------------------[...]

Radio Interface 4-72 Advanced Configuration Ad mission Control: No TX OP Limit: 0.000 ms AC2(Video) : lo gCwMin: 3 logCwMax: 4 AIFSN: 1 Ad mission Control: No TX OP Limit: 3.008 ms AC3(Voice) : lo gCwMin: 2 logCwMax: 3 AIFSN: 1 Ad mission Control: No TX OP Limit: 1.504 ms ==================================== ===================================== RB[...]

Radio Interface RoamAbout RBT-4102 Wireless Access Point Configur ation Guide 4-73 V irtual APs (V APs) Configuration In  addition  to  defining  netw ork  characteristics  for  the  default  radio  interface,  you  can  define  network  characteristics  for  up  to  seven  VA P s  per [...]

Radio Interface 4-74 Advanced Configuration – Secure  Acces s  specifies  whether  clients  can  access  the  default  radio  interface  netw ork  by  discoveri ng  and  automatically  configuring  the  SSID,  or  whether  clients  must  be  already  configured  with ?[...]

Radio Interface RoamAbout RBT-4102 Wireless Access Point Configur ation Guide 4-75 Using the CLI to Configure V irtual APs From  the  global  configuration  mode,  enter  the  interface  wireless  a  comm and  to  access  the  802.11a  radio  interface,  or  the  interface  wireless  g [...]

Radio Interface 4-76 Advanced Configuration To  view  VA P  settings,  use  the  show  interface  wireless  <a|g>  <vap#>  command. AP4102-230.108#show interface wirele ss g 1 Wireless Interface Information ==================================== ===================================== ----------------Identif[...]

Radio Interface RoamAbout RBT-4102 Wireless Access Point Configur ation Guide 4-77 Ad mission Control: No TX OP Limit: 0.000 ms AC2(Video) : lo gCwMin: 3 logCwMax: 4 AIFSN: 2 Ad mission Control: No TX OP Limit: 3.008 ms AC3(Voice) : lo gCwMin: 2 logCwMax: 3 AIFSN: 2 Ad mission Control: No TX OP Limit: 1.504 ms WMM AP Parameters AC0(Best Effort) : l[...]

Security 4-78 Advanced Configuration Security The  access  point  is  configured  by  default  as  an  “open  sy stem,”  which  broadcasts  a  beacon  signal  including  the  configured  SSID.  Wir e l es s  clients  with  an  SS ID  setting  of  “any”  can [...]

Security RoamAbout RBT-4102 Wireless Access Point Configur ation Guide 4-79 Wired Equivalent Privacy (WEP) WEP  provide s  a  basic  level  of  security ,  preventing  unau thorized  access  to  the  netw ork  and  encrypting  data  transmitted  between  wireless  clients  and  the  [...]

Security 4-80 Advanced Configuration – Key  Ty p e  specifies  the  preferred  method  of  entering  WEP  encryption  keys  on  the  access  point  and  enter  up  to  four  keys: ‐ Hexadecimal :  Enter  keys  as  10  hexadecimal  digits  (0  to  9  and ?[...]

Security RoamAbout RBT-4102 Wireless Access Point Configur ation Guide 4-81[...]

Security 4-82 Advanced Configuration • Pr e ‐ Authentication .  If  Pre ‐ Authenticati on  is  enabled,  a  WP A2  wireless  client  can  perform  an  802.1X  authe ntication  with  other  wireless  access  poi nts  in  its  range  when  it  is  still  connected [...]

Security RoamAbout RBT-4102 Wireless Access Point Configur ation Guide 4-83 – Supported ‐ allows  WP A ‐ enabled  clients  and  clients  only  capable  of  supporting  WEP  to  access  the  network.  • WP A  Key  Management:  Yo u  can  configure  WP A  to  wor k  in[...]

Security 4-84 Advanced Configuration The  802.1x  EAP  packets  are  al so  used  to  pass  dynamic  unicast  ses sion  keys  and  static  broadcast  keys  to  wireless  clients.  Session  keys  are  unique  to  each  client  and  are  used  to  encrypt [...]

Security RoamAbout RBT-4102 Wireless Access Point Configur ation Guide 4-85 If  you  specify  RADIUS  MAC  for  this  default  interface  or  VA P,  you  must  specify  the  following  parameters: – MAC  Authentication  Password  specifies  the  authenticati on  password  this ?[...]

Security 4-86 Advanced Configuration Using the CLI to Configure WP A Pre-Shared Key To  enter  a  key  val u e,  use  the  wpa ‐ psk ‐ type  command  to  specify  a  hexadecimal  or  alphanumeric  key ,  and  then  use  the  wpa ‐ preshared ‐ key  command  to  define  t[...]

Security RoamAbout RBT-4102 Wireless Access Point Configur ation Guide 4-87 To  view  the  current  security  settin gs,  use  the  show  interface  wireless  a  or  show  interface  wireless  g  command. Example RBT4102-230.101#show interface wirel ess a Wireless Interface Information ============[...]

Security 4-88 Advanced Configuration AC1(Background) : lo gCwMin: 4 logCwMax: 10 AIFSN: 7 Ad mission Control: No TX OP Limit: 0.000 ms AC2(Video) : lo gCwMin: 3 logCwMax: 4 AIFSN: 2 Ad mission Control: No TX OP Limit: 3.008 ms AC3(Voice) : lo gCwMin: 2 logCwMax: 3 AIFSN: 2 Ad mission Control: No TX OP Limit: 1.504 ms WMM AP Parameters AC0(Best Effo[...]

Security RoamAbout RBT-4102 Wireless Access Point Configur ation Guide 4-89 Using the CLI to Configu re Lo cal MAC Authentication Use  the  mac ‐ authenticat ion  server  command  from  the  Interface  Wir e l e ss  or  Interface  Wir e l e ss :  VA P  configuration  modes  to  enable  local  [...]

Security 4-90 Advanced Configuration 802.11a 802.11b/g Index MAC Address Status 01234567 01234567 ===== ================= ========= == ====== ======== 1 00-01-f4-88-b3-d7 ALLOWED ****** ** ******** 2 00-00-11-22-33-44 ALLOWED *--*-- -- *--*---- ==================================== ===============[...]

Security RoamAbout RBT-4102 Wireless Access Point Configur ation Guide 4-91 Using the CLI to Configure RADIUS MAC Authentication Use  the  mac ‐ authenticat ion  server  command  from  the  Interface  Wir e l e ss  or  Interface  Wir e l e ss :  VA P  configuration  modes  to  enable  remote  [...]

Security 4-92 Advanced Configuration To  display  the  current  settings,  us e  the  show  authenti cation  command  from  the  Executive  mode. Example RoamAbout 4102#show authentication 802.11a Authentication Server Inform ation VAP AuthMode SessionTimeout Password Default Local MAC ========================[...]

Security RoamAbout RBT-4102 Wireless Access Point Configur ation Guide 4-93 Using the CLI to Configur e WEP Shared Key Security From  the  interface  wireless  or  interface  wireless:  VA P  configurat ion  modes,  use  the  authentication  command  to  enable  WEP  shared ‐ key  authentica t[...]

Security 4-94 Advanced Configuration To  view  the  current  security  settings,  use  the  show  interfac e  wireless  a  <vap#>  or  show  interface  wireless  g  <vap#>  command. RoamAbout 4102#show interface wirele ss g Wireless Interface Information ==========================[...]

Security RoamAbout RBT-4102 Wireless Access Point Configur ation Guide 4-95 Using the CLI to Configur e WEP over 802.1x Security From  the  interface  wireless  or  interface  wireless:  VA P  configurat ion  modes,  use  the  authentication  command  to  select  open  system  authentication. ?[...]

Security 4-96 Advanced Configuration WPA Key Mgmt Mode : DY NAMIC WPA PSK Key Type : HE X Encryption : 64 -BIT ENCRYPTION Default Transmit Key : 1 Common Static Keys : Ke y 1: ***** Key 2: EMPTY Ke y 3: EMPTY Key 4: EMPTY Pre-Authentication : Di sabled Authentication Type : OP EN ----------------Authentication Param eters---------------------------[...]

Security RoamAbout RBT-4102 Wireless Access Point Configur ation Guide 4-97 Using the CLI to Configure WP A2 Security From  the  interface  wireless  or  interface  wireless:  VA P  configurat ion  modes,  use  the  authentication  command  to  select  the  wpa2  required  authentication. [...]

Security 4-98 Advanced Configuration WPA PSK Key Type : HE X Encryption : 64 -BIT ENCRYPTION Default Transmit Key : 1 Common Static Keys : Ke y 1: ***** Key 2: EMPTY Ke y 3: EMPTY Key 4: EMPTY Pre-Authentication : Di sabled Authentication Type : WP A2-ONLY ----------------Authentication Param eters--------------------------------- 802.1X : RE QUIRE[...]

Security RoamAbout RBT-4102 Wireless Access Point Configur ation Guide 4-99 Using the CLI to Configure WP A2 Pre-Shared Key Security From  the  interface  wireless  or  interface  wireless:  VA P  configurat ion  modes,  use  the  authentication  command  to  select  wpa2 ‐ psk  authentication. ?[...]

Security 4-100 Advanced Configuration Multicast cipher : AE S Unicast cipher : AE S PMKSA Lifetime : 72 0 minutes WPA clients : RE QUIRED WPA Key Mgmt Mode : PR E SHARED KEY WPA PSK Key Type : AL PHANUMERIC Encryption : 64 -BIT ENCRYPTION Default Transmit Key : 1 Common Static Keys : Ke y 1: ***** Key 2: EMPTY Ke y 3: EMPTY Key 4: EMPTY Pre-Authent[...]

Status Information RoamAbout RBT-4102 Wireless Access Point Configuration Guide 4-101 S t atus Information Status  information  is  described  in  Ta b l e 4 ‐ 8 . T able 4-8 St atus Menu Description AP S tatus Displays configuratio n settings for the basic system and the wirel ess interface CDP S tatus Displays information about n[...]

Status Information 4-102 Advanced Configuration Using W eb Management to V iew AP S t atus Select  AP  Status  from  the  menu.[...]

Status Information RoamAbout RBT-4102 Wireless Access Point Configuration Guide 4-103 AP  System  Configuration  displa ys  the  following  basic  system  configurat ion  settings: • System  Up  Ti m e  is  the  length  of  time  the  management  agent  has  been  up. • MAC  A[...]

Status Information 4-104 Advanced Configuration Using the CLI to Display AP St atus To  view  the  current  access  point  system  settings,  use  the  show  system  command  from  the  Executiv e  mode.  To  view  the  current  radio  interfa ce  settings,  us e  the  sh[...]

Status Information RoamAbout RBT-4102 Wireless Access Point Configuration Guide 4-105 Using W eb Management to V iew CDP St atus The  CDP  Status  window  shows  the  CDP  enabled  devices  currently  asso ciated  with  the  access  point.  Select  CDP  Status  from  the  menu. Neighbors ?[...]

Status Information 4-106 Advanced Configuration Using the CLI to Display CD P St atus Use  the  cdp  enable  or  cdp  auto ‐ enable  commands  from  the  general  configuration  mode  to  enable  the  AP  to  use  CDP .  Set  CDP  parameters  using  the  cdp  hold ‐ t[...]

Status Information RoamAbout RBT-4102 Wireless Access Point Configuration Guide 4-107 Using W eb Management to V iew S t ation S t atus The  Station  Status  window  displays  the  status  of  stations  associated  with  the  defaul t  radio  interfaces  and  any  VA P s  configured  for  [...]

Status Information 4-108 Advanced Configuration • Station  Address  is  the  MAC  address  of  the  wir eless  client. • Authenticat ed  disp lays  if  the  station  has  been  au thenticated.  The  two  bas ic  methods  of  authentication  supported  for  802.11  wir[...]

Status Information RoamAbout RBT-4102 Wireless Access Point Configuration Guide 4-109 Using W eb Management to V iew Neighbor AP Detection S t atus The  Neighbor  AP  Detection  St atus  window  shows  the  wireless  clients  curren tly  associated  with  the  access  point.  Select  Neighbor  A[...]

Status Information 4-110 Advanced Configuration Using the CLI to V iew Neig hbor AP Detection St atus To  view  the  neighbor  AP  detecti on  resul ts  of  a  rogue  AP  scan,  use  the  show  rogue ‐ ap  command  from  the  Executive  mode. Example RoamAbout 4102#show rogue-ap 802.11a [...]

Status Information RoamAbout RBT-4102 Wireless Access Point Configuration Guide 4-111 Using W eb Management to V iew WDS-STP St atus Select  WDS ‐ STP  Status  from  the  menu. • Port  number  is  the  designated  port. • Priority  defines  the  pr iority  of  the  port  in  STP .  If ?[...]

Status Information 4-112 Advanced Configuration Using the CLI to View WDS-STP St atus To  view  the  status  information  shown  in  the  WDS ‐ STP  Status  web  page,  yo u  will  need  to  enter  several  commands.  This  section  breaks  up  the  commands  that  you [...]

Status Information RoamAbout RBT-4102 Wireless Access Point Configuration Guide 4-113 show bridge link Child St atus The  following  example  uses  th e  show  bridge  li nk  command,  from  the  Executiv e  mode,  to  display  the  status  for  ea ch  Child  connection. Example RoamAbout [...]

Status Information 4-114 Advanced Configuration Root Bridge St atus The  following  example  uses  th e  show  bridge  li nk  command,  from  the  Executiv e  mode,  to  display  the  root  bridge  status. Example RoamAbout 4102#show bridge link wire less a Interface Wireless A WDS Information =[...]

Status Information RoamAbout RBT-4102 Wireless Access Point Configuration Guide 4-115 Using W eb Management to View Event Logs The  Event  Logs  window  shows  the  log  messages  generated  by  the  access  po int  and  stored  in  memory .  The  Clear  Logs  button  clears  all [...]

Status Information 4-116 Advanced Configuration Using the CLI to V iew Event Logs From  the  global  configuration  mode,  use  the  show  logging  command. Examples RoamAbout 4102#show logging Logging Information ==================================== ======== Syslog State : Enabled Logging Console State : Enabled Logging [...]

Status Information RoamAbout RBT-4102 Wireless Access Point Configuration Guide 4-117 Oct 21 10:15:51 Notice: 802.11b/g VAP2:Station Associated: 00-e0-63-50-3d-eb Oct 21 10:15:51 Notice: 802.11b/g VAP2:S tation Forwarding: 00-e0-63-50-3d-eb Encryption key type=STATIC WEP Press <n> next. <p> previous. <a> abort. <y> continue [...]

Status Information 4-118 Advanced Configuration[...]

RoamAbout RBT-4102 Wireless Access Point Config uration Guide A-1 A Default Settings This  appendix  lists  the  access  point  system  defaults.  To  reset  the  access  point  defaults,  refer  to  the  CLI  command  “reset  configuration”  from  the  Executiv e  level ?[...]

A-2 Default Settings CDP CDP Auto Enable Auto Hold T ime 180 (seconds) Tx Frequency 60 (seconds) Port Settings Auto VLAN Management VLAN Disabled Management VLAN ID 1 VLAN Disabled Native VLAN 1 Untagged VLAN ID 1 IAPP IAPP Enabled Filter Control IBSS Relay All V AP Wireless AP Management Disabled Ethernet T ype Filter Disabled Rogue AP Interface a[...]

RoamAbout RBT-4102 Wireless Access Point Config uration Guide A-3 System Log Syslog Setup Disabled Logging Console Disabled Logging Level Error Logging F acility T ype 16 SNTP Server Disabled SNTP Primary Server 137.92.140.80 SNTP Secondary Server 192.43.244.18 SNTP Server Date-T ime 00:00, January 1st, 2000 Daylight Savings Disabled WDS & STP [...]

A-4 Default Settings Radio Channel Default Wireless Interface 802.1 1a (Continued) Auto Channel Select Enabled T ransmit Power Full Auto Data Rate Select Enable Software Retry Disable Maximum Tx Data Rate 54 Mbps Beacon Interval 100 ms Data Beacon Rate (DTIM) 2 Beacons Fragment Length 2346 bytes RTS Threshold 2347 bytes Maximum Associations 255 V A[...]

RoamAbout RBT-4102 Wireless Access Point Config uration Guide A-5 MAC Authentication M AC Authentication L ocal MAC System Defa ult Allowed Session T imeout 0 (disabled) Password NOP ASSWORD 802.1x Authentication S tatus Disabled Broadcast Key Refresh 0 minutes (disabled) Session Key Refresh 0 minutes (disabled) Session T imeout 60 minutes (disab l[...]

A-6 Default Settings Preamble Length Long Wireless Interface 802.1 1b/g (Continued) V AP1: Network Name (SSID) RoamAbout De fault Netwo rk Name 1 V AP2: Network Name (SSID) RoamAbout De fault Netwo rk Name 2 V AP3: Network Name (SSID) RoamAbout De fault Netwo rk Name 3 V AP4: Network Name (SSID) RoamAbout De fault Netwo rk Name 4 V AP5: Network Nam[...]

RoamAbout RBT-4102 Wireless Access Point Config uration Guide B-1 B T roubleshooting T roubleshooting Step s Check  the  following  items  before  contacting  technical  suppor t. 1. If  wireless  clients  c annot  access  the  network,  check  the  following: a. Be  sure  the  access  poi[...]

Troubleshooting Steps B-2 Troubleshooting 3. If  you  cannot  access  the  on ‐ board  configuration  program  via  a  serial  port  connection: a. Be  sure  you  have  set  the  te rminal  emulator  program  to  VT100  compatible,  8  data  bits,  1  stop  bit[...]

Maximum Distance Tables RoamAbout RBT-4102 Wireless Access Point Config uration Guide B-3 Maximum Dist ance T ables Ta b l e B ‐ 1  through  Ta b l e B ‐ 3  list  the  wireless  distance s. The  operating  range  distances  listed  in  the  following  tabl es  are  for  typical  environments[...]

Maximum Distance Tables B-4 Troubleshooting[...]

Index-1 Index Numerics 802.1D tags WWM 4-68 802.1x description 4-83 enable options 4-84 session key refresh rate 4-84 session timeout 4-84 802.1x su pplicant 4-16 password 4-16 username 4-16 using the CLI 4-17 A Administration CLI 4-41 Advanced c onfigurat ion 4-1 All VAP mode 4-19 Antenna ID 4-59 AP scan duration 4-28 scan interval 4-28 Applicatio[...]

Index-2 Logging Console 4-45 Logging level 4-46 Lost password B-2 M MAC address authentication 4-84 MAC Authentication MAC address username 4-1 1 RADIUS server password required 4-1 1 MAC Authentication Settings 4-85 MAC Authentication table 4-85 Maximum Associations 4-58 Maximum data rate 802.11a interface 4-60 maximum data rate 4-60 Maximum dista[...]

Index-3 V VLAN configuration 4-58 native ID 4-58 VLAN ID 4-19 VLAN ID RADIUS Attributes 4-58 VLAN IDs 4-58 VLANs 4-18 W WDS 4-50 bridge 4-52 CLI 4-54 WDS & STP web management 4-51 Web Manageme nt SNMP 4-30 WMM 4-69 Web manageme nt administration 4-40 authentication 4-16 CDP 4-24 com port 4-41 configuration page descriptions 4-1 default username[...]

Index-4[...]