[c-nsp] 3550 high cpu & process switched traffic

[Clinton Work]

Your problem is too many routes for the default SDM template. The default 
template is limited to 8K Unicast routes.  If you change the SDM template to 
routing you can probably fit the 11K routes into the TCAM.  The routing 
template is 24K for the 3550-12G and 16K routes for the regular 3550s.

Please check "show sdm prefer".

3550#show sdm prefer
  The current template is the default template.
  The selected template optimizes the resources in
  the switch to support this level of features for
  16 routed interfaces and 1K VLANs.

  number of unicast mac addresses:   6K
  number of igmp groups:             6K
  number of qos aces:                2K
  number of security aces:           2K
  number of unicast routes:          12K
  number of multicast routes:        6K


Note, seeing a high pps of routing packets under "show controller cpu" is 
bad. It means that the IP packets are being punted to the CPU for 
forwarding. You will see some due to IP options that can't be processed in 
the TCAM IP forwarding.

3550#sh contr cpu
routing packets : 3323805100 retrieved, 0 dropped, 0 errors

Example from a 3550 routing about 50Mbps of Internet traffic and the CPU is 
at 2%.  Each of these commands is a couple of seconds apart. The router is 
forwarding about 20,000 pps of Internet traffic.


3550#show controllers cpu-interface  | inc routing
routing protocol packets : 21492556 retrieved, 0 dropped
routing packets : 297482820 retrieved, 0 dropped

3550#show controllers cpu-interface  | inc routing
routing protocol packets : 21492557 retrieved, 0 dropped
routing packets : 297482826 retrieved, 0 dropped

3550#show controllers cpu-interface  | inc routing
routing protocol packets : 21492557 retrieved, 0 dropped
routing packets : 297482831 retrieved, 0 dropped

3550#show controllers cpu-interface  | inc routing
routing protocol packets : 21492557 retrieved, 0 dropped
routing packets : 297482837 retrieved, 0 dropped

3550#show controllers cpu-interface  | inc routing
routing protocol packets : 21492557 retrieved, 0 dropped
routing packets : 297482845 retrieved, 0 dropped




Tassos Chatzithomaoglou wrote:
> 
> 3550#sh ip cef sum
> IP CEF with switching (Table Version 2714880), flags=0x0
>   11194 routes, 0 reresolve, 0 unresolved (0 old, 0 new), peak 3
>   11197 leaves, 683 nodes, 2233168 bytes, 2714439 inserts, 2703242 
> invalidations
>   1 load sharing elements, 336 bytes, 1 references
>   universal per-destination load sharing algorithm, id BAF66A0D
>   2(0) CEF resets, 446 revisions of existing leaves
>   Resolution Timer: Exponential (currently 1s, peak 1s)
>   444 in-place/0 aborted modifications
>   refcounts:  196815 leaf, 175104 node
> 
>   Table epoch: 0 (11197 entries at this epoch)


-- 
===================================================
Clinton Work	clinton at scripty.com
Calgary, AB