MQC vs. legacy Frame Relay traffic shaping

[jackawang]

I learned using the modern "MQC" way to configuer Frame Realy traffic shaping. I have my configuration as follows:

!

class-map VOICE

match ip dscp ef

!

class-map DATA

match ip dscp cs1

!

! "Child" policy-map, used to implement CBWFQ

!

policy-map CBWFQ

class VOICE

  priority 64

class DATA

  bandwidth 128

class class-default

  fair-queue

!

! "Parent" policy map, used for PVC shaping

!

policy-map SHAPE_384K

class class-default

  shape average 384000

  shape adaptive 192000

  service-policy CBWFQ

interface Serial 0/0/0:0.1

ip address 177.0.112.1 255.255.255.0

service-policy output SHAPE_384K

frame-relay interface-dlci 112

I've seen several hybrid configurations and I am not sure which one is correct and recommended. By "hybrid", I mean mixure of legacy FRTS and MQC.

------ Hybrid Config 1 (let MQC shape, just use legacy FRTS map-class to apply) ------------

! Class-map and Policy-map definations stay the same...

!

map-class frame-relay FRTS

service-policy SHAPE_384K

interface Serial 0/0/0:0.1

ip address 177.0.112.1 255.255.255.0

frame-relay interface-dlci 112

  class FRTS

------ Hybrid Config 2 (Let MQC do CBWFQ and let legacy FRTS shape and apply -----

map-class frame-relay SHAPE_384K

  frame-relay cir 38400

  frame-relay bc 3840

  frame-relay be 0

  service-policy CBWFQ

interface Serial 0/0/0:0.1

frame-relay traffic-shaping

ip address 177.0.112.1 255.255.255.0

frame-relay interface-dlci 112

  class SHAPE_384K

Please advise the differences between them and which one is recommended.

[Marwan ALshawi]

Hi

they are both to some extent can do the same thing

but the hybrid one you call

which is FR class map class and under it you apply a service policy can let you have per-VC QoS Policy

so you will have per-VC CBWFQ here by calling this MQC in the FRTS map-class

one this to consider is the MQC applied under the map-class for per-VC QoS consider the available bandwidth based on the micir so you need to adjust this value to meet your need by default is it micir = CIR/2

as you can apply it under the interface DLCI command, which is useful when you have hub router with multipoint interface and several DLCIs for the Spokes with differnt bandwidth/QoS needs

however the new IOS version can also shape per DLCI using MQC only using class map and GTS shaping

you can match the DLCI using the bellow commands

class-map map1

match fr-dlci xx      where xx is the dlci number and you can use it in the MQC policy

HTH

if helpful Rate