Managing F-Chip Memory - Avaya P580 User Manual

Web Agent
Procedure
CLI Command

Managing F-chip Memory

Document No. 650-100-700, Issue 1
To use the Web Agent to manually change the IP unicast hash mode from
DA-only to SA-DA:
1. In the navigation pane, expand the Routing > L3 Forwarding Cache >
Cache Configuration. The Layer-3 Forwarding Cache Configuration
Web page is displayed in the content pane.
2. In the Hash Mode field for IP Unicast traffic, select SA-DA.
3. Click APPLY.
To use the CLI to manually change the IP unicast hash mode from DA-only
to SA-DA, enter the following command:
(configure)# ip unicast route-cache hash-mode sa-da
The reconfiguration of Hash Mode can cause a secondary effect: increased
cache usage. By default, the IP Unicast Cache size is 15,000 entries per F-
chip. Although this can be used up simply due to a high number of flows
(for example, a proxy server for the internet), the SA-DA Hash Mode
setting always causes 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 number comprises IP Unicast, IP Multicast, and
IPX entries for that F-chip.
To view the current total number of entries for the CPU, expand the
Routing > L3 Forwarding Cache folders, and then click Cache
Configuration. The Total Current Entries field displays the current total
entries for the CPU.
To view the current total number of entries for each F-chip, expand the
Routing > L3 Forwarding Cache folders, and then click Cache Contents.
The Active FE Web page is displayed in the content pane. See
As long as these totals stay under 70K, it is safe to increase the IP Unicast
Maximum Entries to prevent overflow. If the switch is not routing IPX or
has minimal IP Multicast traffic, it is generally safe to double the IP Unicast
maximum to 30,000.
When you enable an ACL, the switch may change the maximum number of
forwarding entries for IP unicast traffic to improve the performance of the
switch. If the maximum number of entries is set to:
Less than 15,000, the switch automatically doubles the setting.
Configuring Access Lists
Figure 13-7.
13-27