x460 Summit Stack Performance-Internet Slowness

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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.
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Stanley Riley Jr.

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Posted 3 years ago

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Prashanth KG, Employee

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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!
(Edited)
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Stanley Riley Jr.

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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?
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Prashanth KG, Employee

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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
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Stanley Riley Jr.

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Oh.  I'm sorry, I guess I confused the 2 topologies.  Here is my output:

Stack Topology is a Ring
Active Topology is a Ring
Node MAC Address    Slot  Stack State  Role     Flags
------------------  ----  -----------  -------  ---
*00:04:96:x  1     Active       Master   CA-
 00:04:96:x  8     Active       Standby  CA-
 00:04:96:x  7     Active       Standby  CA-
 00:04:96:x  6     Active       Standby  CA-
 00:04:96:x  5     Active       Standby  CA-
 00:04:96:x  4     Active       Standby  CA-
 00:04:96:x  3     Active       Standby  CA-
 00:04:96:x  2     Active       Backup   CA-
* - Indicates this node
Flags:  (C) Candidate for this active topology, (A) Active Node
        (O) node may be in Other active topology

Port Rx Error Monitor                                  Thu Nov  5 11:11:13 2015
Port      Link     Rx      Rx      Rx        Rx      Rx         Rx         Rx
          State    Crc    Over    Under     Frag    Jabber      Align      Lost
================================================================================
1:1       A      981       0        0        0        0          0          0
1:2       A        2       0        0        0        0          0          0
2:1       A        0       0        0        0        0          0          0
2:2       A        0       0        0        0        0          0          0
3:1       A        0       0        0        0        0          0          0
3:2       A        0       0        0        0        0          0          0
4:1       A        0       0        0        0        0          0          0
4:2       A        0       0        0        0        0          0          0
5:1       A        0       0        0        0        0          0          0
5:2       A        0       0        0        0        0          0          0
6:1       A     6302       0        0        0        0          0          0
6:2       A        0       0        0        0        0          0          0
7:1       A     5824       0        0        0        0          0          0
7:2       A        0       0        0        0        0          0          0
8:1       A        0       0        0        0        0          0          0
8:2       A        0       0        0        0        0          0          0
================================================================================
          > indicates Port Display Name truncated past 8 characters
          Link State: A-Active, R-Ready, NP-Port Not Present, L-Loopback
          0->Clear Counters  U->page up  D->page down ESC->exit

Congestion information for slot 1 type X460-48p since last query
  No switch fabric and CPU congestion present

Congestion information for slot 2 type X460-48p since last query
  No switch fabric and CPU congestion present

Congestion information for slot 3 type X460-48p since last query
  No switch fabric and CPU congestion present

Congestion information for slot 4 type X460-48p since last query
  No switch fabric and CPU congestion present

Congestion information for slot 5 type X460-48p since last query
  No switch fabric and CPU congestion present

Congestion information for slot 6 type X460-48p since last query
  No switch fabric and CPU congestion present

Congestion information for slot 7 type X460-48p since last query
  No switch fabric and CPU congestion present

Congestion information for slot 8 type X460-48p since last query
  No switch fabric and CPU congestion present
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Drew C., Community Manager

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Those RX CRC errors are of interest.
If you watch that output, are they incrementing?  You can clear counters to set it back to zero and watch too.
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Stanley Riley Jr.

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Agreed.  I have cleared the counters and I'm watching the output.  So far, port 6:1 has incremented by 5 over the last say 10-15 minutes.  And 7:1 increased by 1 while typing this reply.

Do we have a possible bad stacking cable or stacking modules?
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Drew C., Community Manager

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Yep, both cases are possible (though a cable is most likely).  Can I ask you to open a case with GTAC so they can help you dig in and figure it out?
How to contact Extreme Networks Global Technical Assistance Center (GTAC)
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Stanley Riley Jr.

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Sure can...thanks for all the help!