12-29-2008 07:22 PM - edited 03-06-2019 03:10 AM
Hi All,
We were trying to configure Modular QOS on an ATM sub-interface in output direction on a Cisco 3845 router and we get an error message stating CBWFQ not supported on sub-interfaces.The sample config as below
policy-map x
class w
priority percent 20
class y
bandwidth percent 10
We have class-map configured appropriately.
Any help would be appreciated.
Thanks
Regards
Anantha Subramanian Natarajan
12-30-2008 12:25 AM
Hello Anantha,
have you configured the ATM class of service on the associated PVC ?
if UBR it doesn't allow to use the CBWFQ because it sees the ATM subif without guaranteed BW resources
Hope to help
Giuseppe
12-30-2008 05:58 AM
Hi Giuseppe,
Thanks for the response,Let me check whether UBR been used on that ATM subif.
Once again thank you very much
Regards
Anantha Subramanian Natarajan
12-30-2008 08:27 AM
Hi anasubra,
We have several 3845s in our environment doing MQC. They act as ATM hosts for our client edge sites and we then connect to the AT&T network MPLS network to back haul to their perspective HQs. On the MPLS circuits the policy will need to go under the PVC like this.
interface ATM0/IMA1.1 point-to-point
description xxxxxxxxxxxxxxxxxxxx
bandwidth 1216
ip vrf forwarding xxxxxxx
ip address xx.xx.xx.xx 255.255.255.252
pvc 1/32
vbr-nrt 1216 1216 1
tx-ring-limit 3
oam-pvc manage 0
encapsulation aal5snap
service-policy output
On the ATM host side it goes directly under the sub-interface like this..
interface ATM0/IMA0.58 point-to-point
ip vrf forwarding xxxxxxx
ip address xx.xx.xx.xxx 255.255.255.252
service-policy input
pvc 1/40
encapsulation aal5snap
HTH,
Lloyd
12-30-2008 08:45 AM
Hi Lloyd,
Thank you very much for the response. Actually with respect to your scenario,the ATM host side is our Cisco 3845 router having the point-to-point pvc and when we tried to configure the service-policy under the subif,it didn't take the command and gives the message that CBWFQ not supported on the subif,,,,also we tried configure the service-policy under the pvc and it takes the command without any error message but didn't show in the configuration.
Any help would be appreciated.
Thanks
Regards
Anantha Subramanian Natarajan
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