Avaya P580 User Manual download pdf (Page 327)

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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,

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Last slot of a P882

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Avaya P580 User Manual Page 327

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