map-class frame-relay , policy map

Answered Question
Feb 26th, 2007

Does a service-policy output have to be applied to an interface for qos to work?

here is the config but there is nothing applied to the serial interface..

Thanks for your help

policy-map 256/128KVoice

class 256/128KVoice

priority 112

class class-default


map-class frame-relay 256/128KVoice

frame-relay cir 128000

frame-relay bc 1280

frame-relay be 600

frame-relay mincir 128000

no frame-relay adaptive-shaping

frame-relay fair-queue

frame-relay fragment 150

frame-relay ip rtp priority 16384 16380 210

interface Serial0/0

bandwidth 1544

ip address

ip route-cache flow

no fair-queue

service-module t1 timeslots 1-24

I have this problem too.
0 votes
Correct Answer by Brandon Buffin about 9 years 7 months ago

Yes, the policy must be applied to an interface/sub-interface for QoS to take affect. Take a look at the QoS SRND for specific examples. Look under WAN Aggregator QoS Design -> WAN Edge Link-Specific QoS Design.


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ud0508500 Tue, 02/27/2007 - 04:18

Great....thank you for your time and help

greatly appreciate it..

Quick question about fair-queue.

should this be set on the interface as well, as it sits now there is no fair-queue on the serial interface

Brandon Buffin Tue, 02/27/2007 - 05:28

The fair-queue command is not necessary on the serial interface. The command in the policy map for class class-default will fair-queue all traffic not in the 256/128KVoice class.

Hope this helps. If so, please rate the post.


kumar-brajesh Thu, 07/14/2011 - 03:55


Will QOS will work in this way  where class is put on WAN interface where it should be service  policy.

router#sh run interface Se0/0/0.1
Building  configuration...

Current configuration : 239 bytes
interface  Serial0/0/0.1 point-to-point

bandwidth 2048
ip address XXXX
ip nat outside
frame-relay  interface-dlci 555
  class COS-OUT-S0/0/0.1   

COS-OUT-S0/0/0.1 is defined as policy map  with class of voice and video.

When checking on WAN int #sh policy-map  interface  Se0/0/0.1 , can see output of service policy input/output with policy map  recpective classes and packets match entries.Is  QOS working with this  configuration?

Appreciate any input on this.




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