QoS on dialer interface with MLPPP

Unanswered Question
Apr 15th, 2014
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Hello,

 

I am facing a curious situation at applying CBWFQ on dialer interface with MLPPP.

Platform is Cisco2901 and IOS version is 15.3(3)M1

If I applied "service-policy output WAN-CBWFQ" on dialer interface with MLPPP, it is just discarded without any error message.

Policy-map and interface config is as follow.

policy-map WAN-CBWFQ
 class RT
  bandwidth percent 97
  queue-limit 128 packets
 class Data
  bandwidth percent 2
 class class-default

interface Dialer2
 ip address 172.26.156.1 255.255.255.252
 encapsulation ppp
 dialer pool 2
 dialer string 00000000   (00000000 is dummy)
 dialer load-threshold 1 either
 dialer-group 1
 ppp authentication chap
 ppp chap hostname golbasi_isdn
 ppp multilink

 

After several trial, I found following step (to remove "ppp multilink" before applying "service-policy") worked. 

[config command]

conf t

int di2

no ppp multilink

service-policy output WAN-QOS-ISDN

ppp multilink

end

Interface config after above step is as follow.

interface Dialer2
 ip address 172.26.156.1 255.255.255.252
 encapsulation ppp
 dialer pool 2
 dialer string
00000000   (00000000 is dummy)
 dialer load-threshold 1 either
 dialer-group 1
 ppp authentication chap
 ppp chap hostname golbasi_isdn
 ppp multilink
 service-policy output WAN-CBWFQ


I tried this on another IOS 15.2(4)M5, and it worked as expected just "service-policy" command without step to remove "ppp multilink".

Does this mean newer IOS (such as 15.3) does not support QoS on dialer interface with MLPPP ?
 

Best Regards,

 

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