Dell PowerEdge FN I/O Module Configuration Guide 9.10(0.0)

PDF

ACL Resequencing

ACL resequencing allows you to re-number the rules and remarks in an access or prefix list.

The placement of rules within the list is critical because packets are matched against rules in sequential order. To order new rules using the current numbering scheme, use resequencing whenever there is no opportunity.

For example, the following table contains some rules that are numbered in increments of 1. You cannot place new rules between these packets, so apply resequencing to create numbering space, as shown in the second table. In the same example, apply resequencing if more than two rules must be placed between rules 7 and 10.

You can resequence IPv4 ACLs, prefixes, and MAC ACLs. No CAM writes happen as a result of resequencing, so there is no packet loss; the behavior is similar Hot-lock ACLs.

NOTE: ACL resequencing does not affect the rules, remarks, or order in which they are applied. Resequencing merely renumbers the rules so that you can place new rules within the list as needed.

Table 1. ACL Resequencing
Rules	Resequencing
Rules Before Resequencing:	seq 5 permit any host 1.1.1.1
	seq 6 permit any host 1.1.1.2
	seq 7 permit any host 1.1.1.3
	seq 10 permit any host 1.1.1.4
Rules After Resequencing:	seq 5 permit any host 1.1.1.1
	seq 10 permit any host 1.1.1.2
	seq 15 permit any host 1.1.1.3
	seq 20 permit any host 1.1.1.4