Spanning tree: everyone's favorite protocol! Thousands of pages have already been written about spanning tree, so I've decided to ta...

In two recent posts, I covered SPAN , for mirroring traffic to a port on a local switch, and RSPAN , for mirroring traffic across a VLAN to ...

I recently wrote a post on configuring port mirroring (SPAN) on Cisco Catalyst switches .  SPAN (switched port analyzer) allows you to mirro...

So you have a network issue.  Or perhaps you don't, but you need to help find the root cause of a performance issue and conclusively sho...