A coworker wanted to move servers from one tier to another. There’s a really simple solution that you may not see since policy is in the way.
Tag: csm
CSCtd31622 – CSM, Cookies, and the year 2010
It seems that we have another piece of evidence that Cisco doesn’t like the CSM. From what I’m able to creatively interpret, the software developers didn’t think anyone would be running the CSM for very long, so they set a…
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…
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…
CSM Probe Status of ???
I must be bored since I’m posting again. A colleague asked me to change the failed value of a TCP probe today. It was no big deal, but, when I looked to see the status of the change, I noticed…
Fail Actions on CSM Serverfarms
I’ve talked about probes and stuff on the CSM, but I never mentioned what happens to the connections to a server that fails. That is, if I’m connected to server A in a cluster and that server suddenly commits ritual…
Configuring Dedicated Trunks for the CSM
Did you catch the article on setting up fault tolerance on the CSM? In that article, I mentioned that Cisco recommends a dedicated trunk for the FT VLAN if you have two HA CSMs in two chassis. Discuss amongst yourselves…
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 probes (or just probes) typically send traffic to one…
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 separate…
Running Multiple Data Centers on a Stick with the CSM
That’s an awesome title, eh? I’ve mentioned a router-on-a-stick before but not a data-center-on-a-stick (DCOAS). This is one of those Cisco terms I ran across a while ago and is a group of servers sort of sticking out on their…