Avaya P580 - Manual (Page 327)

Avaya P550R, P580, P880, and P882 Multiservice Switch User Guide, v5.3.1 9-41
Configuring IP Routing
Configuring Hash Mode
If your diagnosis shows a performance degradation with an ACL
enabled, the IP Unicast Hash mode needs to be changed from
“DA-only” to “SA-DA”.
To do this from the switch Web Agent, select:
Routing>L3 Forwarding Cache> Cache Configuration> IP
Unicast Hash Mode
To do this from the switch CLI, enter the following command in
Configure mode:
<configure># ip unicast route-cache hash-mode sa-da
This can cause a noticeable increase in the total Flows identified
resulting in a increased F-chip memory usage. See the next section
in this case.
Important: Changing the Hash Mode parameter affects every L3-
enabled F-chip on the P580/P882.
Managing F-chip Memory
The reconfiguration of Hash Mode can cause a secondary effect:
increased cache usage. By default, the IP Unicast Cache size is 15000
entries per F-chip. Although this can be used up simply due to a
high number of Flows (e.g., a proxy server for the internet), the SA-
DA Hash Mode will always cause more Flows to be identified than
in the DA-only mode.
The F-chip memory can accommodate approximately 70,000 total
entries for routed (L3) Flows. This is comprised of IP Unicast, IP
Multicast, and IPX entries for that F-chip. The running total is
viewable via the Web Agent as follows:
For the CPU L3, select:
Routing>L3 Forwarding Cache>Cache Configuration> Cur-
rent System Entries
For each F-chip, select:
Routing>L3 Forwarding Cache>Cache Contents,
17 32 32/1-
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33 33/1-
33/4
Last slot of a P882