Nortel 2245 - Multicast

Page 44 of 206 Planning
553-3001-304 Standard 3.00 September 2004
Note: The WSS 2270 must be running version 2.0.71.0 (or later)
software.
Mobility across different subnets when using DHCP
If a WSS is not in use and the wireless handset’s IP address has been acquired
through DHCP, the wireless handset must be powered down and powered up
when entering a new subnet. This enables functionality of the wireless
handset when entering the WLAN RF signal coverage area of a different
WLAN IP Telephony Manager 2245 group on a different subnet. Once the
wireless handset establishes communication within the ESSID of the new
WLAN, obtains another IP address from the DHCP server, and checks in with
the group master, normal functionality returns. If the wireless handset is
configured to use ESSID of the new WLAN, it automatically discovers the
ESSID of the APs operating in broadcast mode.
Table 5 summarizes the capabilities.
Multicast
IP multicast addresses are used by the WLAN Handset 2211’s Push To Talk
(PTT) feature. This requires that multicasting be enabled on the Layer 2
switch used by the defined group (WLAN IP Telephony Manager 2245
master/slaves and wireless handsets).
Table 5
Roaming and handover capabilities summary
IP address WSS in use Roaming capability Handover capability
Static No No No
Static Ye s Ye s Ye s
DHCP No Yes, if the wireless
handset is power-
cycled between
subnets.
No
DHCP Ye s Ye s Ye s