ExtremeSwitching (Other)

  • 1.  x460 Summit Stack Performance-Internet Slowness

    Posted 11-05-2015 14:23
    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.



  • 2.  RE: x460 Summit Stack Performance-Internet Slowness

    Posted 11-05-2015 14:30
    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!


  • 3.  RE: x460 Summit Stack Performance-Internet Slowness

    Posted 11-05-2015 14:50
    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?


  • 4.  RE: x460 Summit Stack Performance-Internet Slowness

    Posted 11-05-2015 14:56
    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


  • 5.  RE: x460 Summit Stack Performance-Internet Slowness

    Posted 11-05-2015 15:13
    Oh. I'm sorry, I guess I confused the 2 topologies. Here is my output:

    [i][i][i]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



  • 6.  RE: x460 Summit Stack Performance-Internet Slowness

    Posted 11-05-2015 15:13
    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.


  • 7.  RE: x460 Summit Stack Performance-Internet Slowness

    Posted 11-05-2015 15:13
    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?


  • 8.  RE: x460 Summit Stack Performance-Internet Slowness

    Posted 11-05-2015 15:13
    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)



  • 9.  RE: x460 Summit Stack Performance-Internet Slowness

    Posted 11-05-2015 15:13
    Sure can...thanks for all the help!