Intermittent 100% Backplane Utilisation on Cisco 6500

Discussion in 'Hardware' started by pkcwu, Nov 13, 2008.

  1. pkcwu

    pkcwu

    Joined:
    Nov 12, 2008
    Messages:
    1
    Hi,

    I'm currently having issues with one of the Cisco 6506 in the network, it is running HSRP with another 6506 and also running OSPF/BGP. Recently, this 6506 is having intermittent 100% backplane utilisation, which caused everything to stop responding for a couple of seconds.

    As a result, spanning tree recalculation and HSRP failover kicked in, and caused interruptions in many parts of the network.

    What I don't understand is what caused the 100% utilisation, googling reveals that it could be caused by spanning tree loops and broadcast storms. But I have already tuned down the storm-control on broadcast on all ports into the 6506, and I don't think there are any loops in the network.

    Unlike an DDoS attack where the 100% utilisation is continuous, it just peaks at 100% for 1 or 2 seconds and comes back down... the logs don't seem to show much

    Any one have similar experience or is able to point me in the right direction would be greatly appreciated! Thanks.

    Here's the show version and show module:

    show version
    Cisco Internetwork Operating System Software
    IOS (tm) c6sup1_rp Software (c6sup1_rp-PSV-M), Version 12.1(22)E1, EARLY DEPLOYMENT RELEASE SOFTWARE (fc1)
    Technical Support: xxxxxx
    Copyright (c) 1986-2004 by cisco Systems, Inc.
    Compiled Fri 16-Apr-04 10:13 by pwade
    Image text-base: 0x60020F90, data-base: 0x616EA000

    ROM: System Bootstrap, Version 12.0(3)XE, RELEASE SOFTWARE
    BOOTLDR: MSFC Software (C6MSFC-BOOT-M), Version 12.1(3a)E4, EARLY DEPLOYMENT RELEASE SOFTWARE (fc1)

    xxxxxxxx uptime is 23 weeks, 5 days, 27 minutes
    Time since xxxxxxxx switched to active is 23 weeks, 5 days, 29 minutes
    System returned to ROM by power-on (SP by reload)
    System restarted at 09:34:31 AEST Sat May 31 2008
    System image file is "slot0:c6sup11-psv-mz.121-22.E1"

    cisco WS-C6506 (R5000) processor (revision 3.0) with 114688K/16384K bytes of memory.
    Processor board ID TBA05290886
    R5000 CPU at 200Mhz, Implementation 35, Rev 2.1
    Last reset from power-on
    X.25 software, Version 3.0.0.
    Bridging software.
    146 Virtual Ethernet/IEEE 802.3 interface(s)
    48 FastEthernet/IEEE 802.3 interface(s)
    10 Gigabit Ethernet/IEEE 802.3 interface(s)
    381K bytes of non-volatile configuration memory.
    4096K bytes of packet SRAM memory.

    16384K bytes of Flash internal SIMM (Sector size 256K).
    Configuration register is 0x2102



    show module
    Mod Ports Card Type Model Serial No.
    --- ----- -------------------------------------- ------------------ -----------
    1 2 Cat 6k sup 1 Enhanced QoS (Active) WS-X6K-SUP1A-2GE SAD03414219
    3 48 48 port 10/100 mb RJ-45 ethernet WS-X6248-RJ-45 SAD03430896
    5 8 8 port 1000mb GBIC Enhanced QoS WS-X6408A-GBIC SAD05040L5K

    Mod MAC addresses Hw Fw Sw Status
    --- ---------------------------------- ------ ------------ ------------ -------
    1 00d0.bcee.59a8 to 00d0.bcee.59a9 3.2 5.3(1) 12.1(22)E1 Ok
    3 0030.9613.f314 to 0030.9613.f343 1.1 4.2(0.24)VAI 8.3(0.111)TF Ok
    5 0002.fc25.3224 to 0002.fc25.322b 1.6 5.4(2) 8.3(0.111)TF Ok

    Mod Sub-Module Model Serial Hw Status
    --- --------------------------- --------------- --------------- ------- -------
    1 Policy Feature Card WS-F6K-PFC SAD03424981 1.0 Ok
    1 MSFC Cat6k daughterboard WS-F6K-MSFC SAD03427635 1.4 Ok

    Mod Online Diag Status
    --- -------------------
     
    pkcwu, Nov 13, 2008
    #1
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