[c-nsp] QPPB on Cisco 3750-ME

[Chris Mason]

Hi,

I am not having much luck on Google with regards to if this is
supported or not, but I currently have a 3750-ME running 12.2(44)SE6
and I am having some interesting results when trying to use QPPB. The
same configuration works perfectly well on an ISR, but the 3750 can be
quite feature limiting due to it's hardware nature. I wouldn't be
using a 3750 for this sort of thing unless I needed the throughput
with H-QoS.

I have a table-map applied under BGP which sets a precedence value
based on a community (standard QPPB) and I can see that CEF has this
precendence value saved ready to use:

Switch# show ip route 192.0.2.1
Routing entry for 192.0.2.0/24
  Known via "bgp 64512", distance 20, metric 0
  Tag 100, precedence priority (1), type external         <-- IP Prec 1
  Last update from 192.168.0.1 00:47:11 ago
  Routing Descriptor Blocks:
  * 192.168.0.1, from 192.168.0.1, 00:47:11 ago
      Route metric is 0, traffic share count is 1
      AS Hops 6
      Route tag 100

I then define "bgp-policy destination ip-prec-map" on the ingress interface:

interface FastEthernet1/0/2
 no switchport
 ip address 10.254.0.1 255.255.255.0
 bgp-policy destination ip-prec-map
!

When I send traffic in on this interface it isn't being marked - I
have applied an outbound ACL which matches precedence values and I can
see it coming through as IP Prec 0. If I originate traffic with IP
Prec 1 then it comes through as IP Prec 1 on my ACL - the "bgp-policy"
statement doesn't appear to be doing anything at all.

Has anyone tried to use this feature on the 3750-ME before or am I
hitting a platform limitation?

Thanks,
Chris