Catalyst
Using Probes on the CSM
There are three different ways that a CSM checks for the health of the servers – active probes, inband health checking, and inband HTTP monitoring. Let’s talk about active probes. Active …
Configuring Fault Tolerance on the CSM
Like (nearly) everything in the Cisco world, you can set up your CSM to fail over to another module when the primary dies a horrible death. You can have two in the same chassis or even have them in …
Back to Basics -- CAM Table Population
At the office, we reprovision servers like it’s going out of style. It happens so often that my cabling documentation rarely matches what’s actually out in field, which is a pretty big …
Storm Control
We run a large number of LANs all over the country that are “controlled” by the particular business unit. We manage the gear, but, since they have the money and have to pay for anything we …
Getting Started with EtherChannel
In my professional life at some point, I came across someone who had a stack of Catalyst 2950 switches all trunked together with their Internet routers connected to the top of the stack. This was all …
Trunking on a Catalyst Switch
If you didn’t now already, trunks are connections between switches that carry traffic for all VLANs. It allows you to have, say, VLAN 10 and VLAN 20 on two switches appear as the same network. …