[c-nsp] 3750 Dropping into software forwarding?

[Will Hargrave]

Will Hargrave wrote:

> It's a shame that Cisco don't give any guidance on how to interpret
> 'show platform tcam usage' on 3750. On 6500 you can do 'show platform
> hardware capacity forwarding' to check your TCAM usage.

... I didn't look hard enough ...

> I guess I could file an enhancement request since I have a bunch of
> 3750s on smartnet, but I don't know how much these kind of requests are
> listened to in Cisco and whether anyone would actually give a shit :-)

Sorry, this sounded a bit ranty... long day. It's already been
implemented, at least in 12.2(25)SEE2:

xxx-c3750-1#show platform tcam utilization

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

 Unicast mac addresses:                        400/3200         80/571
 IPv4 IGMP groups + multicast routes:          144/1152          7/28
 IPv4 unicast directly-connected routes:       400/3200         80/571
 IPv4 unicast indirectly-connected routes:    1040/8320         58/371
 IPv4 policy based routing aces:               512/512           2/2
 IPv4 qos aces:                                512/512           6/6
 IPv4 security aces:                          1024/1024        204/204

Note: Allocation of TCAM entries per feature uses
a complex algorithm. The above information is meant
to provide an abstract view of the current TCAM utilization

xxx-c3750-1#show sdm prefer
 The current template is "desktop routing" template.
 The selected template optimizes the resources in
 the switch to support this level of features for
 8 routed interfaces and 1024 VLANs.

  number of unicast mac addresses:                  3K
  number of IPv4 IGMP groups + multicast routes:    1K
  number of IPv4 unicast routes:                    11K
    number of directly-connected IPv4 hosts:        3K
    number of indirect IPv4 routes:                 8K
  number of IPv4 policy based routing aces:         512
  number of IPv4/MAC qos aces:                      512
  number of IPv4/MAC security aces:                 1K


Fab. :-)

Will