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IPv4 Access Control Lists (ACLs)

Monitoring Static ACL Performance

ACE Counter Operation: For a given ACE in an assigned

ACL, the counter increments by 1 each time the switch detects

a packet that matches the criteria in that ACE, and maintains

a running total of the matches since the last counter reset.

For example, in ACL line 10 below, there has been a total of 37

matches on the ACE since the last time the ACL’s counters were

reset.

Total

( 37) 10 permit icmp 10.10.20.3

Note: This ACL monitoring feature does not include hits on

the “implicit deny” that is included at the end of all ACLs.

Resetting ACE Hit Counters to Zero:

• Removing an ACL from an interface zeros the ACL’s ACE

counters for that interface only.

• For a given ACL, either of the following actions clear the ACE

counters to zero for all interfaces to which the ACL is

assigned.

– adding or removing a permit or deny ACE in the ACL

– rebooting the switch

9-93

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