This mimics the configuration on a 3850 stack that comes into play.
Now, when the desktop team has their system builds plugged into that 3750, in their words, the "network is slow" - which it "is." I pulled captures off the machines in question, and from the core switches, and from the filer that they are mostly trying to install things from. I don't typically pay attention to Expert data in a capture but the errors are in the thousands, despite packet response time being well within tolerable. I watched the interfaces (all of them involved) and noticed no drops or errors. Checked the switch CPU and mem, looked fine.
Here's where it gets interesting... I replaced the 3750 with another I had laying around and the same issue presents itself. Now, when they hook the machines up directly to their cube ports which are on a 3850 stack, boom! Everything is quick and the captures are clean.
The only major difference being 3850 vs 3750 and with that a 2 gig port channel vs a 20 gig port channel, however, they aren't even taxing the 2 gig port channel on the 3750.
I'm not sure where else to look at this point, especially with swapping the switch out. I was kind of hoping that would do it, like there was a hidden gremlin in the other 3750 that was causing trouble.
I know I didn't cover everything I did troubleshooting wise in this post, I'll be glad to repeat steps and procedures for you.
Both switches have a single path to the cores, no hops involved.
Network is VSS
Broadcast packets are within normal for the domain, I don't suspect congestion
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