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New Member

Priority queueing of packets on frame relay subinterface

I need to get some low volume, interactive data, prioritized on frame relay PVCs across our network. I have followed the CBWFQ examples from cisco.com, but my test packets are still showing latency over 1 second. My lab set up has a corporate connected gateway router linked via FE to testrouter 50. TR51 has a T1 frame relay loop to another router acting as a frame relay switch. The other side of the FR switch has a 56k link to  testrouter51. I am sourcing test pings from my desktop PC, that are marked as AF43, and leave at a rate of 1/second, when the response comes back in time. I am using a Smartbits to generate some default class traffic at a rate of about 56Kbps only in the 'outbound' direction, toward TR51, as this emulates a file copy from corporate to remote sites, that is causing the AF43 traffic to suffer. Here is the relevant config on the TR50 device:

class-map match-all rtu-data

match ip dscp af43

!

policy-map frame-56

class rtu-data

    priority percent 20

class network-mgt-data

    bandwidth percent 5

class class-default

     random-detect dscp-based

     fair-queue

!

interface Serial0/2/0

no ip address

encapsulation frame-relay

load-interval 30

no fair-queue

service-module t1 clock source internal

frame-relay traffic-shaping

!

interface Serial0/2/0.501 point-to-point

bandwidth 56

ip address 10.41.111.50 255.255.255.0

snmp trap link-status

frame-relay class frame-56

frame-relay interface-dlci 501

  class frame-56

!

map-class frame-relay frame-56

frame-relay cir 56000

frame-relay bc 300

frame-relay be 0

frame-relay mincir 56000

service-policy output frame-56

!

Thanks in advance for any suggestions you have !

1 REPLY
New Member

Priority queueing of packets on frame relay subinterface

Minor correction to above:

gateway router linked via FE to testrouter 50. TR51 has a T1 frame relay loop to another router acting as a frame relay switch.

should be:

gateway router linked via FE to testrouter 50. TR50 has a T1 frame relay loop to another router acting as a frame relay switch.

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