Inserting Rules into ACLs

To insert rules into an ACL, follow these steps.
  1. Enter the configure terminal command to access global configuration mode. 
    device# configure terminal
  2. Enter ACL configuration sub-mode for the IPv4, IPv6, or MAC ACL you want to modify. 
    device(config)# ip access-list standard ip_acl_1

    device(config)# ipv6 access-list ipv6_acl_1

    device(config)# mac access-list macdata
  3. Enter the appropriate show command to display the rules of the relevant ACL.
    • Enter the show ip access-lists command followed by the name of an IPv4 ACL.
    • Enter the show ipv6 access-lists command followed by the name of an IPv6 ACL.
    • Enter the show mac access-lists command followed by the name of a MAC ACL.
    device(config-std-ipacl-ip_acl_1)# show ip access-lists ip_acl_1
Standard IP access list ip_acl_1: 3 entries
10: permit 1.1.1.0  0.0.0.255
11: permit host 2.2.2.1 
20: deny   2.2.2.0  0.0.0.255

    device(config-ipv6-access-list ipv6_acl_1)# show ipv6 access-lists ipv6_acl_1
ipv6 access list ipv6_acl_1: 3 entries
10: permit ipv6 2001:DB8::/64 any
11: permit ipv6 2001:DB8:101::/64 any 
20: permit ipv6 host 2001:DB8:aa:10::102 host 2001:DB8:101::102

    device(config-macl-mac123)# show mac access-lists mac123
mac access-list mac123: 1 entries
permit 1111.2222.3333 ffff.ffff.ffff 4444.5555.6666 ffff.ffff.ffff
  4. To insert a rule between two adjacent rules, complete the following steps:
    1. In ACL configuration sub-mode, enter the regenerate-seq-number command. 
      device(config-ipv6-access-list ipv6_acl_1)# regenerate-seq-number
    2. Re-enter the appropriate show command to display the updated contents of the ACL. 
      device(config-ipv6-access-list ipv6_acl_1)# show ipv6 access-lists ipv6_acl_1
10: permit ipv6 2001:DB8::/64 any
20: permit ipv6 2001:DB8:101::/64 any 
30: permit ipv6 host 2001:DB8:aa:10::102 host 2001:DB8:101::102
  5. Create the new rule, beginning with the keyword sequence and the needed sequence number.
    device(config-ipv6-access-list ipv6_acl_1)# sequence 25 permit ipv6 2001:DB8:10::/64 2001:DB8:102::/64
Parent topic: Sequence-based ACL Editing