Cisco 3750 – weird tcam usage

ciscoswitch

I have two 3750-X switches operating in a stack. The SDM template is set to desktop routing, as we need a lot of next-hop unicast routes.

The tcam usage is not looking quite right…every value is maxed out. Has anyone seen this before (or have any explanation to it), or should I open a TAC case right away?

CAM Utilization for ASIC# 0                      Max            Used
                                             Masks/Values    Masks/values

Unicast mac addresses:                       3292/3292        627/627
IPv4 IGMP groups + multicast routes:         1120/1120          1/1
IPv4 unicast directly-connected routes:      3072/3072         92/92
IPv4 unicast indirectly-connected routes:    8144/8144       3730/3730
IPv4 policy based routing aces:               498/498          13/13
IPv4 qos aces:                                474/474          21/21
IPv4 security aces:                           972/972          33/33

Edit:

Here is an example from Cisco, wich looks quite different:
http://www.cisco.com/en/US/products/hw/switches/ps5023/products_tech_note09186a00807213f5.shtml#SDM

Edit2:

I might want to add the reason why I'm investigating this: We're experiencing very random latency when we ping this switch, no matter what VRF or VLAN we use. The CPU utilization looks a bit weird as well:

    6644646454444584445446554355447464554555554444464645444445457455556545
    6907344850716408995114547934140092790235780624077383760641040825126164
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)

Current usage:

CPU utilization for five seconds: 25%/1%; one minute: 24%; five minutes: 24%
 PID Runtime(ms)   Invoked      uSecs   5Sec   1Min   5Min TTY Process
  81   105562156    425102     248330 13.41% 11.52% 11.62%   0 Adjust Regions
  75    38660112   6968319       5547  3.03%  2.94%  2.84%   0 RedEarth Tx Mana
  74    24316130  11091855       2192  1.59%  1.59%  1.59%   0 RedEarth I2C dri
   4    15330586    677415      22631  0.00%  1.14%  1.14%   0 Check heaps

Best Answer

You're not maxed out. The second set of numbers is the current utilization, and the first column is the max.

Edit 1: On page 17 of this link is a decent explanation of it.

Edit 2: For your underlying issue that you are noting, take a look at show controller utilization to get a good feel for the traffic you're seeing. Also, here's a decent guide from Cisco on troubleshooting high CPU usage in 3750s (linked here)

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