Qos on Cisco 2610 with ISO 13.3(26)

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Expand view Topic review: Qos on Cisco 2610 with ISO 13.3(26)

Re:Qos on Cisco 2610 with ISO 13.3(26)

by Guest » Mon Jan 10, 2011 9:03 pm


Thanks for all of you help.Best regards,E.

Re:Qos on Cisco 2610 with ISO 13.3(26)

by Guest » Mon Jan 10, 2011 8:51 pm


The policy, itself, basically looks alright, although the bandwidth allocation for voice signaling might be too little.In execution, you didn't match any voice signaling packets, but since you're running FQ in class-default, you probably don't need a defined class for this traffic.What is of much concern with your policy stats, is the deep queue within class-default and the number of drops (21%).What you might try, remove both header compression statements from the multilink interface.

Re:Qos on Cisco 2610 with ISO 13.3(26)

by Guest » Mon Jan 10, 2011 8:28 pm


Joseph,Thank you very much for your persistent to help, I have decided to move on into the new way of managing voice over IP and you recommended. I have attached one router configuration with using LLQ. There is a problem with the configuration because as soon as I put the router in production it works for about a minute or two and then nothing goes through. Could you or any one give a look and comment on it please. I have a feeling that I am very close.P.S. I'm sure that our phone server ( Toshiba CTX 100)is the voice packets but Is it DSCP or DSCP EF or something else I don't know at this point; may be its better for me to prioritize the packets base on the host IP.Thank you,  

Re:Qos on Cisco 2610 with ISO 13.3(26)

by Guest » Mon Jan 10, 2011 6:59 pm


You might want to consider the information I provided in my post to your other (duplicate?) post.  See: http://forums.cisco.com/eforum/servlet/ ... ed_message

Re:Qos on Cisco 2610 with ISO 13.3(26)

by Guest » Mon Jan 10, 2011 6:31 pm


Hello.I think you might have a problem with your classification. By this I mean that your traffic is not being marked with the correct DSCP value or specifying cs5 for voice is incorrect.My question 'What is doing the classification' basically means what devices are marking the packets with the DSCP values? Is it the switch that is doing the classification or do you have your IP phones setting the DSCP value? If we can find this out then we can see what DSCP value is being set for voice payload.In the 'show access-list' you have pasted we can see how many matches each line gets. On the router 'Ellsworth' you can see you only have 8 packet matches for cs5. This indicates our problem as 1 single voice call will be way more than 8 packets alone.So to continue I would try the following:1) Try and find out what is classifying the voice traffic and what is it classifying it with?2) The normal DSCP value for voice payload is EF. You could try the following: i) adding the line 'access-list 102 permit ip any any dscp ef' to both routers ii) Make a voice call across the link iii) Then check the 'show access-list' command again to see if matches are shown against the new line.Simon

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