Cisco Cisco Access Registrar 4.2 Spécifications télécharger pdf (Page 135)

4-37

Cisco Wireless LAN Controller Configuration Guide

OL-13826-01

Chapter 4 Configuring Controller SettingsWireless Device Access

Configuring Client Roaming

You can adjust the default RF settings (RSSI, hysteresis, scan threshold, and transition time) to fine-tune

the operation of client roaming using the controller GUI or CLI.

Intra-Controller Roaming

Each controller supports same-controller client roaming across access points managed by the same

controller. This roaming is transparent to the client as the session is sustained, and the client continues

using the same DHCP-assigned or client-assigned IP address. The controller provides DHCP

functionality with a relay function. Same-controller roaming is supported in single-controller

deployments and in multiple-controller deployments.

Inter-Controller Roaming

Multiple-controller deployments support client roaming across access points managed by controllers in

the same mobility group and on the same subnet. This roaming is also transparent to the client because

the session is sustained and a tunnel between controllers allows the client to continue using the same

DHCP- or client-assigned IP address as long as the session remains active. The tunnel is torn down, and

the client must reauthenticate when the client sends a DHCP Discover with a 0.0.0.0 client IP address or

a 169.254.*.* client auto-IP address or when the operator-set session timeout is exceeded.

Note Cisco 1030 remote edge lightweight access points at a remote location must be on the same subnet to

support roaming.

Inter-Subnet Roaming

Multiple-controller deployments support client roaming across access points managed by controllers in

the same mobility group on different subnets. This roaming is transparent to the client because the

session is sustained and a tunnel between the controllers allows the client to continue using the same

DHCP-assigned or client-assigned IP address as long as the session remains active. The tunnel is torn

down, and the client must reauthenticate when the client sends a DHCP Discover with a 0.0.0.0 client IP

address or a 169.254.*.* client auto-IP address or when the operator-set user timeout is exceeded.

Note Cisco 1030 remote edge lightweight access points at a remote location must be on the same subnet to

support roaming.

Voice-over-IP Telephone Roaming

802.11 voice-over-IP (VoIP) telephones actively seek out associations with the strongest RF signal to

ensure the best quality of service (QoS) and the maximum throughput. The minimum VoIP telephone

requirement of 20-millisecond or shorter latency time for the roaming handover is easily met by the

Cisco UWN Solution, which has an average handover latency of 5 or fewer milliseconds when open

authentication is used. This short latency period is controlled by controllers rather than allowing

independent access points to negotiate roaming handovers.

1 2 ... 130 131 132 133 134 135 136 137 138 139 140 ... 635 636

Pas de commentaire

Cisco Cisco Access Registrar 4.2 Spécifications Page 135