Cisco Support Community
Showing results for 
Search instead for 
Did you mean: 
Community Member

Limiting Bandwidth on a shared T1

I have a frame-relay T1 with multiple point-to-multipoint subinterfaces sharing it. I want to limit the amount of bandwidth each PVC uses. I have some simple Traffic-shaping parameters set, but I still see BECNs and dropped packets. Are there other things I should be looking at to limit its use.


Re: Limiting Bandwidth on a shared T1


what type of traffic are you running over these PVCs.

Is it voice, voice and data or just data ?

There are different parameters that you should set for traffic shaping, if you are running voice/data.

What is your CIR for these pvcs ? Does the configured CIRs conform to what you have purchased ?? Post in your configs, for further analysis.

Community Member

Re: Limiting Bandwidth on a shared T1

This is only for data, no voice.

Most PVCs have a PORT and CIR of the same speed.

Regarding your question " Does the configured CIRs conform to what you have purchased ??". Do you mean what I have configured? If so, the answer is yes.

On the central router, I have the following configuration:

interface Serial1/1

mtu 8192

no ip address

no ip directed-broadcast

encapsulation frame-relay

no ip mroute-cache

frame-relay traffic-shaping

frame-relay lmi-type ansi


interface Serial1/1.806 multipoint

ip address

ip nat inside

ip ospf network point-to-multipoint

no ip mroute-cache

bandwidth 512

frame-relay class CIR-512k

frame-relay map llc2 806

frame-relay map ip 806 broadcast

frame-relay interface-dlci 806


map-class frame-relay CIR-512k

frame-relay cir 512000

frame-relay bc 64000

frame-relay mincir 512000

CreatePlease to create content