[c-nsp] Cisco 837 Series: QoS/Queuing/Shaping Question

[Nigel Camp]

Hi Jason,

>From what I've seen, the default pvc on the 837 is ubr. 
Service policies can only be applied on non ubr pvcs.

Simply change the pvc to something like this...

int atm0
pvc 0/38
vbr-nrt 256 256 
service-policy output shape_for_qos

Changing the pvc type only has local significance on the router.

Cheers,
Nigel 


-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net
[mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Jason Ledbetter
Sent: Friday, 5 November 2004 6:08 AM
To: cisco-nsp at puck.nether.net
Subject: [c-nsp] Cisco 837 Series: QoS/Queuing/Shaping Question

Greetings.

I have several remotes utilizing 800 series routers (831s and 837s) to 
perform QoS (queueing and shaping) for VOIP traffic over an IPsec tunnel.

Both the 831s and 837s are all running 12.3(11)T.

The 831 series seem to be performing as expected, however I am running into
some issues with the QoS configuration on the 837s that appear as though
they might be IOS bugs. I was hoping someone could validate the issues I'm
seeing for sanity purposes.

My QoS configuration looks as such:
!
class-map match-all match_voip_dest
 match access-group 150 ! ACL matching Destination PBX
class-map match-all match_voip_dscp
 match ip dscp ef 
!
policy-map qos_for_voip
 class match_voip_dscp
  priority 128
 class class-default
  fair-queue
policy-map qos_apply_dscp
 class match_voip_dest
  set ip dscp ef
policy-map shape_for_qos
 class class-default
  shape average 248000
  service-policy qos_for_voip
!

For the 831 units, the E0 interface has "service-policy input
qos_apply_dscp"
applied. The E1 interface has "service-policy output shape_for_qos" applied.

However, on the 837 units the following is seen:

!
policy-map shape_for_qos
 class class-default
  ! Note the lack of "shape average 248000"
  ! The command is accepted in the configuration, but not saved
  ! or seen in the running configuration.
  service-policy qos_for_voip
!

Secondly I am apparently unable to apply a policy to ATM0 or the PVC under
ATM0 for the output queue as seen below:

router#show policy-map int atm0 vc 0/38
Service policy is not configured on VC 0/38
router#conf t
router(config)#int atm0
router(config-if)#pvc 0/38
router(config-if-atm-vc)#service-policy output shape_for_qos
router(config-if-atm-vc)#^Z
router#show policy-map int atm0 vc 0/38
Service policy is not configured on VC 0/38

According to http://www.cisco.com/warp/public/121/where_policy.html I
believe
that I am attempting to apply these to the proper interface.....

So the two issues are:

1) Why is "shape average 248000" not saved in the policy-map on the 837?
2) What am I doing incorrectly with application of the output service
policy?

Any input you can give me would be greatly appreciated.

Thanks,

-jbl


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