Troubleshooting PPPoE speed issues with radius

Unanswered Question
May 17th, 2010

Hi all.

I use the Global Cisco VSA, "Cisco-AVPair" in my radius file for my cisco gear to connect.

At some point, someone in my organization recieved information from a Cisco rep that we should follow the following guidelines to setup new plans.

Example file:

elsif ($acct_type eq "512/256")  {\
    ${$_[1]}->add_attr('Cisco-AVPair',\
              'lcp:interface-config=rate-limit output 512000 128000 256000 conform-action transmit exceed-action drop');\
              ${$_[1]}->add_attr('Cisco-AVPair',\
              'lcp:interface-config=rate-limit input 256000 64000 128000 conform-action transmit exceed-action drop');\
      }\

In the file above, the speed is the first number, the next number the burst number, and the 3rd number the excessive burst. The burst and excessive burst are set to 1/4 and 1/2 respectively, at Cisco's advice.

Using this template, we have made many speed plans with no issues. However, I have run into an issue with two news plans we are offering. We increased out backbone to a 150 meg fiber link to the world, so we wished to add new speeds as well.

We want to offer a a 3meg/1.5meg plan (down/up) and a 5meg/2.5meg (down/up) plan. Using this, I have added the following speed plans:

elsif ($acct_type eq "3072/1536")  {\
                ${$_[1]}->add_attr('Cisco-AVPair',\
                                        'lcp:interface-config=rate-limit output 3072000 768000 1536000 conform-action transmit exceed-action drop');\
                                        ${$_[1]}->add_attr('Cisco-AVPair',\
                                        'lcp:interface-config=rate-limit input 1536000 384000 768000 conform-action transmit exceed-action drop');\
                                }\
                elsif ($acct_type eq "5120/2560")  {\
                ${$_[1]}->add_attr('Cisco-AVPair',\
                                        'lcp:interface-config=rate-limit output 5120000 1280000 2560000 conform-action transmit exceed-action drop');\
                                        ${$_[1]}->add_attr('Cisco-AVPair',\
                                        'lcp:interface-config=rate-limit input 2560000 640000 1280000 conform-action transmit exceed-action drop');\
                                }\

These conform to the standards Cisco gave us. However, I am running into issues. Both plans give anywhere from 500k to 2 megs over the listed download rate consistantly. On the upload side, both files seem to be stuck at around 400-500k. I am currently "playing" with the speeds on both ends to resolve this issue, but I'd like some feedback to make sure I'm not overlooking anything in this situation.

Thanks.

I have this problem too.
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