Core issue
The ability to apply sequence numbers to IP access list entries simplifies access list changes. Prior to the IP Access List Entry Sequence Numbering feature, there was not a way to specify the position of an entry within an access list.
A Cisco platform can unexpectedly reload while it attemps to resequence an access list. This symptom is observed when a few Access Control Entries (ACE) are deleted and then immediately enters the ip access-list resequence access-list-name starting-sequence-number increment command.
This problem is documented in Cisco bug ID CSCsa50971.
Resolution
Currently, a workaround does not exist.
This problem is fixed in Cisco IOS Software Release 12.2(25)EWA6 and later, hence in order to resolve this issue, a Cisco IOS upgrade is needed, which can be downloaded from the LAN Switching Software page.
Refer to IP Access List Entry Sequence Numbering for more information.
