Acl
Switching
Using Deny ACEs in your PBR ACL on your Nexus 7k
Quite a while ago I had a need for some network duct tape… Policy Based Routing while useful should only IMHO be used as a temporary fix.
Security
Time-based ACLs
Ever since Cisco released IOS 12.0.1T we’ve had the ability to broaden the reach of the extended ACL to allow the influence of time.
Switching
Using Discontiguous Wildcard Masks in ACLs
Unlike subnet masks, wildcard masks allow you to use discontiguous bits which enable you to match on a range of values.
Security
IOS ACL Resequencing
This is one of those tricks you wish you learned about 10 years ago, but never did. You know how easy it is to mess up a nice looking access list.