Can anyone tell me what a Cisco 3750 Stacksub interface is and why you would want to monitor it? I have an alert setup for the Stackports in case a switch in the stack goes down, but should I be alerting on the Stacksubs?
Thanks!
Bumping the thread.
I would also like to know what the "stackSub" interface is for on a stack switch. Should I be monitoring it, or just the stackports?
I believe those are just the stacking connections. I personally wouldn't alert on them, because if one switch in the stack died, you will probably know about it real quick. Thats just me though.
There are 2 ports on the back of the Cisco 3750's. Depending on the configuration you have the 3750's for redundancy of a failed interconnected cable depends on which stack port may go down.
http://www.cisco.com/en/US/docs/switches/lan/catalyst3750/software/release/12.1_14_ea1/configuration/guide/swstack.html
Ultimately you should create a ring and if one side breaks you won't be down. I alert on them just incase one side was to fail, else I wouldn't notice it until the other side fails as well.
From my perspective it is good to alert on one of them going down as that's an easy way to tell if a switch in the stack died. The only other way I know how to tell if a switch is dead is if you get alerted on any of the other interfaces or by trap.
but how would you know? as the stack ip would still be responding as long as 1 switch in the stack was up
i monitor every stack port, of our 3750's very good idea too
This is true. I suppose it doesn't hurt to have a little extra notification in the event that one stacking port dies, but the switch remains up.
Has anyone actually seen a stacking port die for whatever reason?
i have seen about 3-4 switch's where a stack port will flap, then it will eventually die, so it's good to have a warning on this
Which ports do you alert on? When I do a List Resources on one of my switches there are three different interfaces for each stacking port.
StackPort1, StackSub-St1-1, StackSub-St1-2
Which ports do you alert on? When I do a List Resources on one of my switches there are three different interfaces for each stacking port.StackPort1, StackSub-St1-1, StackSub-St1-2
I have selected all three on my stacks, but I have not had a failure since then to see how each interface acts when there is a failure of some sorts. We did have a stack failure last week, which is what prompted me to ask this question. At that time, I was not monitoring any of the stackports or the stacksubs.
