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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.
When you enable an ACL, the switch automatically sets hash mode for IP unicast traffic to SA-DA. This setting improves the performance of the switch when an ACL is enabled.
This setting can cause a noticeable increase in the total flows identified and result in an increased usage of F-chip memory. See “Managing F-chip Memory” in this case.
IMPORTANT: Changing the Hash Mode setting affects every L3-enabled F-chip on the P580 or P882.
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