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Cisco 6880-X-LE slow response time (CPU problem?)

jhonny.eriksson
Level 1
Level 1

Hello,

 

Just recently I refreshed a complete network where old 3550s and 6500 (SUP2) was switched to 2960X access and 6880-X-LE core. Ever since the refresh we're seeing really wierd response times and users are reporting the network as slow at times.The topology is pretty basic; 2x6880-X-LE core (VSS) and 2960X (single up to 3 switches in a stack) with dual 10G etherchannel-uplinks towards the core.

 

The logical setup is a little bit different becuse we are preparing for a migration from normally routed core to MPLS VPN. As such the configuration for MPLS is completed on the device but the routes are leaked locally to the old IPv4 core until all the sites have updated core equipment that supports MPLS VPN.

 

Looking at the CPU of the 6880-X-LE I find the slcp process (VSS) running really high plus there are spikes every now and then:


    2222222221111122222111112222222222333331111122222111112222
    2222555556666633333666663333300000111116666655555666663333
100
 90
 80
 70
 60
 50
 40
 30     *****                         *****     *****
 20 **********************************************************
 10 **********************************************************
   0....5....1....1....2....2....3....3....4....4....5....5....
             0    5    0    5    0    5    0    5    0    5
               CPU% per second (last 60 seconds)

    3333333333332222522222222332333233322222223323233322333223
    1043420105114499699698569109110812598899880080621068080790
100
 90
 80
 70
 60                 *
 50                 *
 40          *      *                 *                  *
 30 ************  **#*****************************************
 20 ##########################################################
 10 ##########################################################
   0....5....1....1....2....2....3....3....4....4....5....5....
             0    5    0    5    0    5    0    5    0    5
               CPU% per minute (last 60 minutes)
              * = maximum CPU%   # = average CPU%

    5576556666565556766666567575656666666566665666556556666565556567667766
    3506790362745380444136920707590321618722679271782992402874763916889230
100
 90
 80                                                                *  *
 70   **    *       *    *  * * *     * *   **  *           *      *****
 60  ************ ******************************************* ************
 50 **********************************************************************
 40 **********************************************************************
 30 **********************************************************************
 20 ######################################################################
 10 ######################################################################
   0....5....1....1....2....2....3....3....4....4....5....5....6....6....7.
             0    5    0    5    0    5    0    5    0    5    0    5    0
                   CPU% per hour (last 72 hours)
                  * = maximum CPU%   # = average CPU%

Interrupt processing is 0% so all processing dedicated control plane processing. Total of 8 instances of OSPF is running (old VRF-Lite infrastructure) and BGP for the new MPLS VPN which is prepared:

CPU utilization for five seconds: 27%/0%; one minute: 21%; five minutes: 21%
 PID Runtime(ms)   Invoked      uSecs   5Sec   1Min   5Min TTY Process
 108   120571588 177074071        680 15.75% 12.55% 12.65%   0 slcp process
 603    22238784   3375191       6588  6.23%  3.08%  2.88%   0 Lif stats RP tas
 602    22289352   1620456      13754  4.00%  2.79%  2.81%   0 Lif stats hw rea
 143     3863428    827054       4671  0.31%  0.39%  0.41%   0 OIR Process
 924     2185836  58781876         37  0.31%  0.21%  0.22%   0 Port manager per
 907     2682572   2521666       1063  0.23%  0.33%  0.33%   0 Env Poll
1013       84384     63259       1333  0.15%  0.02%  0.00%   0 l2_fwd_mac_oob_s

.

.

 

Pinging the 6880-X-LE or any device attached to it replies with an average 3ms locally, 15-20ms from remote.

Any ideas?

 

9 Replies 9