ip access-list logging hash-generation
Cisco IOS routers generate syslog entries for log-enabled ACEs. The system appends a tag (either a user-defined cookie or a router-generated MD5 hash value) to ACE syslog entries. This tag uniquely identifies the ACE, within an access control list (ACL), that generated the syslog entry.
http://www.cisco.com/en/US/docs/ios/security/command/reference/sec_i1.html#wp1042763
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