11-15-2007 05:45 AM - edited 03-17-2019 09:10 PM
Hi All,
Please advice me what I wanted to do is possible or not.
I have 128 kbps Bandwidth leased line circuit to my branch office in Singapore and I would like to dedicated assign 64 kbps of my bandwidth for VoIP traffice. The rest traffic with go with another 64 kbps.
I am using cisco 1760 routers and is it possible to do?
Any advice will be appreciated.
11-15-2007 05:57 AM
Yes, use LLQ QoS for this.
class-map voice
match dscp ef
policy-map llq
class voice
priority 64
class class-default
fair-queue
interface serial x/y
service-policy output llq
after that, observe results with "show policy-map interface". If no packets matches class voice, your voice traffic is not marked dscp ef, as it should be so. either fix traffic or reconfig class voice.
Hope this helps, please rate post if it does!
11-16-2007 03:05 AM
Hello Sir,
Thanks for your advice.
But I could not understand what is..
class class-default <-- and I also can not type this command in router.
please advice me if you have time.
Thanks,
11-16-2007 04:17 AM
That would all traffic not matching class voice, ive fair queueing. It is not really necessary to have that, but is beneficial expecially on slow links.
Which exact IOS are you using ?
11-16-2007 06:07 PM
Hi,
IOS version is "C1700-IPVOICE-M (Version 12.3(7)XR3.
Thanks,
11-17-2007 02:29 AM
If you cannot upgrade IOS, just leave it without "class-default". Wath matters, is priority for voice.
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11-18-2007 05:50 PM
I have two routers connected. So, do I need to configure for both sides?
Thanks.
11-19-2007 07:45 PM
Bevilacqua,
I just configure on two Routers. Once I finised the configuration. I saw below output with not packets transfering.
Router#sh policy-map interface
Serial0/1
Service-policy output: llq
Class-map: voice (match-all)
0 packets, 0 bytes
5 minute offered rate 0 bps, drop rate 0 bps
Match: dscp ef
Queueing
Strict Priority
Output Queue: Conversation 40
Bandwidth 32 (kbps) Burst 800 (Bytes)
(pkts matched/bytes matched) 0/0
(total drops/bytes drops) 0/0
Class-map: class-default (match-any)
3269 packets, 2187341 bytes
5 minute offered rate 57000 bps, drop rate 0 bps
Match: any
Router#
After I made some ph calls. I can see below output showing packets transfering.
Router#sh policy-map interface
Serial0/1
Service-policy output: llq
Class-map: voice (match-all)
5045 packets, 322159 bytes
5 minute offered rate 5000 bps, drop rate 0 bps
Match: dscp ef
Queueing
Strict Priority
Output Queue: Conversation 40
Bandwidth 32 (kbps) Burst 800 (Bytes)
(pkts matched/bytes matched) 3115/128688
(total drops/bytes drops) 0/0
Class-map: class-default (match-any)
16895 packets, 10045657 bytes
5 minute offered rate 81000 bps, drop rate 0 bps
Match: any
Router#
So, is it working fine now? How can I check it is actually reserver the bandwidth for voice?
Thanks for your kind help.
11-20-2007 09:55 AM
Hi,
yes, it seems you are using a low bitrate codec, w/ vad.
You have reserved 32 kbps for voice. When there is no voice traffic, data can use that bandwidth.
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