Nortel Networks WEB OS 212777 - Manual (Page 162)

Web OS 10.0 Application Guide
162 n Chapter 6: Server Load Balancing
212777-A, February 2002
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If a session entry for a client cannot be added because of resource constraints, the subse-
quent WAP packets for that client will not be load balanced correctly; and the client will
need to drop the connection and then reconnect to his wireless service.
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The persistence of a session cannot be maintained if the number of healthy real WAP gate-
ways changes during the session. For example, if a new WAP server comes into service or
some of the existing WAP servers are down, the number of healthy WAP gateway changes
and, in this case, the persistence for a user cannot be maintained.
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Persistence cannot be maintained if the user moves from one ISP to another, or if the base
of the user’s session changes (that is, from CALLING_STATION_ID to USER_NAME, or
vice versa). For example, if a user moves out of a roaming area, it is possible that his/her
CALLING_STATION_ID is not available in the RADIUS Accounting packets. In such a
case, the switch uses USER_NAME to choose a WAP server instead of
CALLING_STATION_ID. Thus, persistence cannot be maintained.
Configure the following filter on the switch to examine a RADIUS accounting packet:
1. Set the basic filter parameters.
2. Turn on proxy and RADIUS snooping.
3. Apply and save your configuration.
N OTE – Web OS supports Virtual Router Redundancy Protocol (VRRP) and stateful failover,
using both static session entries and RADIUS snooping. However, active-active configuration
with Stateful Failover is not supported.
>> # /cfg/slb/filt 1 (Select the filter)
>> Filter 1 # dip 10.10.10.100 (Set the destination IP address)
>> Filter 1 # dmask 255.255.255.255 (Set the destination IP mask)
>> Filter 1 # proto udp (Set the protocol to UDP)
>> Filter 1 # dport 1813 (Set the destination port)
>> Filter 1 # action redir (Set the action to redirect)
>> Filter 1 # group 1 (Set the group for redirection)
>> Filter 1 # rport 1813 (Set server port for redirection)
>> Filter 1 # adv (Select the advance filter menu)
>> Filter 1 Advanced# proxy ena (Enable proxy)
>> Filter 1 Advanced# rdsnp ena (Enable RADIUS snooping)
>> Filter 1 Advanced# apply
>> Filter 1 Advanced# save