I am trying to implement QOS in a network. We want to reserve bandwidth usage for different applications and to prioritize voice traffic.
I have used the following configuration for testing.
access-list 103 permit tcp any any eq smtp
access-list 103 permit tcp any any eq 1326
access-list 104 permit tcp any any eq www
access-list 104 permit tcp any any eq 443
access-list 110 permit udp any any range 16384 32767
access-list 111 permit tcp any eq 2000 any
access-list 111 permit tcp any any eq 2000
Class-map match-all voice-signaling
match access-group 111
class-map match-all voice-traffic
match access-group 110
class-map match-all mail
match access-group 103
class-map match-all web
match access-group 104
service-policy output VOICE-POLICY
The traffic flows over 128kbps multilink. The problem I face is that voice quality is too bad. It doesn't matter how much bandwidth I reserve for Voice-traffic.
show policy-map interface command shows drops for a single call with 48 kbps reservation. I increased the bandwidth for voice-traffic to 96kbps. At that time I didn't see any drops but voice quality was still poor.
I am using following configuration on the multilink:
service-policy output VOICE-POLICY
ip route-cache flow
ip tcp header-compression iphc-format
ppp multilink fragment-delay 10
ppp multilink interleave
ip rtp header-compression iphc-format
Its true that the link is overutilized and there is lot of traffic causing congestion. But I expect QOS to prioritize and reserve bandwidth for voice during the time of congestion.
In show policy-map interface command it even shows that its reserving the bandwidth for voice traffic.
There is no other UDP traffic as found with netflow accounting.
As I mentioned earlior, show policy-map int command show me that there are no drops once i reserve it for 96kbps..but the voice is till poor.
I remember looking at one cisco document that if the link is overutilized then Qos will not perform in the expected manner. And you need to increase the bandwidth.
Now my question is, unfortunately, that i expect QOS to reserve the bandwidth with my configuration. Eventough I reserve the bandwidth and I can see the resevation with show policy-map interface command, i don't get the performance.
i just want to know that if my link is over utilized then will QOS work in the same manner or the router will start behaving weird if there is lot of traffic.
Also if the community confirms that my configuration is correct, and there is nothing to modify, the i can take up the things with cisco asw well to find a resolution.
ISP is totally TDM so I don't think thay have anything to do with it.
The configuration on the other side is exactly the same as I put in earlier. I see the access-list and show policy-map counter increasing when I make a voice call. so i am sure that I am not missing any voice signalling or traffis Tcp ot UDP port.
I do not even see the router CPU etting exhausted. My concern is:
1. Is my configuration correct?
2. If there are any modificcations required;..please suggest, i will et back to you after testing it out.
3. If the link is really overuitilized then will the QOS work efficiently?/
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