Towards editing ACLs, you can disable the default restriction on conflicting rules within an ACL. You can then create a conflicting rule before deleting the previous version.
Note
We recommend that after ACL-editing sessions towards which you disabled conflicting-rule check, restore the default setting—by entering the no allow-conflicting-rules command.device# configure terminal
device(config)# acl-policy
device(config-acl-policy)# allow-conflicting-rules
device# show running-config mac access-list extended mac1 mac access-list extended mac1 seq 10 permit host 0001.0001.0001 any seq 20 deny host 0001.0001.0002 any count seq 30 hard-drop host 0001.0001.0003 any mirror
device# configure terminal device(config)# acl-policy device(config-acl-policy)# allow-conflicting-rules
device(config-acl-policy)# exit device(config)# mac access-list mac1 device(conf-macl-ext)# seq 21 permit host 0001.0001.0002 any count device(conf-macl-ext)# no seq 20
device(conf-macl-ext)# exit device(config)# acl-policy device(config-acl-policy)# no allow-conflicting-rules