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BCMSN Notes -- STP States

I’ve decided to take on the CCNP certification, so I’m going to wind up with a few posts will be more my own notes than anything. 🙂 A switch port on a 2960 comes up with a default configuration on VLAN 1. What happens from the perspective of spanning-tree?

Using SSH to Run Commands on a Router or Switch

SSH is more than just a shell. You can copy files from and to a server or piece of network gear with it. You can use it to tunnel traffic. Possibly my favorite, though, is to use SSH to run a command on a remote box without interacting with a

The Most Random Things Can Hurt The Network

This is a great one that I have to share. A couple of coworkers walk in today and ask for some help on an issue. It seems that a business unit was having latency problems with a web app, and, after research by the product team and sysadmins, nothing wrong

Server NIC Aggregation to a Cisco Switch

Have you even noticed that your new servers all have 2 NICs on the board? At least all of them that I’ve seen in the last 3 years have. A lot of server admin actually use them in a NIC teaming scenario where both NICs are used as one

An Interesting Problem with Multiple DCs on a Stick

We talked about running multiple data centers on a stick back in August, which is where you have multiple logical pairs of client and server VLANs on a single CSM for different tiers or functions. The big point of the article was that you had to do some fancy forwarding

RSPANs on Cisco Switches

We discussed SPANs earlier, but let’s talk about RSPANs for a bit. Can anyone guess what the “R” means? You guessed it — “Remote”. An RSPAN is a way to get traffic from a SPAN source on one switch to a SPAN destination on another switch that’s connected via