x460 Summit Stack Performance-Internet Slowness

[Stanley_Riley_J]

Hey guys,

We have an 8 switch stack of x460 48p. We are seeing very slow internet speeds on devices connected to stacks 5,6, and 7.

SWITCH # = DOWNLOAD / UPLOAD

Stack 1 = 168 / 23

Stack 2 = 159 / 23

Stack 3 = 144 / 23

Stack 4 = 120 / 23

Stack 5 = 33 / 23

Stack 6 = 6 / 23

Stack 7 = 20 / 23

Stack 8 = 177 / 23

I have even connected my laptop directly to ports on each stack and took the above measurements. All ports look normal as far as running 1000/FULL. I'm not sure what else to look for.

We are running XOS 15.5.4.2 patch 1-5.

Does anyone have any ideas on this behavior from these switches in our stack? I'm not sure if I provided enough information, but let me know what else might be helpful and I'll see if I can get it.

Thanks in advance for any suggestions you guys might have.

[Drew_C]

Those RX CRC errors are of interest.
If you watch that output, are they incrementing? You can

code:

clear counters

to set it back to zero and watch too.

[Prashanth_KG]

Stanley,

The explanation that slot 8 returns back to slot 1 indicates that it is ring.

Please share the following outputs:

- debug hal show congestion
- show stacking
- show ports stack-ports rxerrors

[Stanley_Riley_J]

The gateway for the internet is in slot 1. I think we are using a daisy chain topology, where slot 1 (stacking port 1) goes to slot 2 (stacking port 2) all the way down the line where on slot 8 returns back to slot 1.

Will that debug be service affecting?

[Prashanth_KG]

Hi Stanley,

Is the stack ring or daisy chain topology?

Do you see any fabric congestion for slots 5, 6 and 7?

"debug hal show congestion"

Also, share the details about where the gateway for internet is connected. In which slot?

Looking forward to your answers!