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1720 VoIP QoS, no rate-limit?

randal
Level 1
Level 1

Hey guys,

I have a site with a Cisco 1720 running 12.2(4)T3. They have a T1, 12 channels for voice, the other 12 for data (768kbps). I need to set them up to guarantee 2x44kbps bandwidth for two VoIP lines that always terminate to 66.239.20.0/24. The VoIP lines do work, but during congestion they enjoy jitter/packet loss. My config doesn't seem to be prioritizing correctly:

!

class-map match-all voice

match access-group 101

!

!

policy-map policy1

class voice

priority 96

class class-default

fair-queue

!

!

interface Serial0

description **XXXXXXXX**

ip address XXXXXXXXXXXX 255.255.255.252

ip access-group FilterInboundv2 in

ip access-group FilterOutbound out

ip nat outside

encapsulation ppp

service-policy output policy1

!

!

access-list 101 permit ip any 66.239.20.0 0.0.0.255

access-list 101 permit ip 66.239.20.0 0.0.0.255 any

Of particular note, I do not have a "rate-limit" command to shape the inbound traffic on s0; anybody have an idea why? Any other pointers would be helpful.

Thanks,

Randal

2 Replies 2

cwy
Level 1
Level 1

Hi,

You have to ensure the remote router also setup the appropriate QoS config.

Moreover, better not only match ip address for the QoS class. You may also consider precedence value as one of the matching rule.

HTH.

rakshitj
Level 1
Level 1

Hi,

If you can use some compression technique it will help you. Kindly see the below script.

!

interface Serial0

bandwidth 64

backup delay 1 1

backup interface Dialer2

no ip address

encapsulation ppp

down-when-looped

no cdp enable

ppp multilink

!

interface Virtual-Template1

ip unnumbered FastEthernet0

no ip split-horizon

fair-queue 64 16 0

ppp authentication chap

ppp multilink

ppp multilink fragment-delay 10

ppp multilink interleave

ip rtp priority 16384 16383 48

!

multilink virtual-template 1

!

Kindly try this script. It had helped me a lot

This is much better then Policy Map.

Regards,

Rakshit Jethva