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Cisco 7200 VXR & Comcast Metro Ethernet Speed issues

Posted on 2012-03-18
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Last Modified: 2012-08-13
We moved to our new headquarters and have Comcast's Metro Ethernet installed.  

We noticed that we weren't getting our rated speeds in the server room, and plugging a laptop into the Comcast device directly, setting Flow Control to off, and the port negotiation to 100 Full Duplex, the laptop pulls a full 100/100 connection.  

We tried that same setup in the server room with the feed coming up from the Comcast equipment, and again, the line is delivering 100/100.  The minute we connect it to the Cisco 7200 VXR, speeds plummet to 1.5 Mbps on both the up and downstream.  

Our Cisco guy on-site says he's used the 7200 VXR with connections much faster than ours, so he's not sure why we're having such a hard time.  In every case, latency is phenomenal, often registering under 10ms to just about anywhere within three states, and not more than 25-30 to New York.  

Anyone have any suggestions?
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Question by:USAVolleyball
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Expert Comment

by:giltjr
ID: 37736028
Can you verify that duplex is correct?

If possible hard code both sides to 100 Mbps Full Duplex.
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Author Comment

by:USAVolleyball
ID: 37736088
It doesn't matter if we match Comcast's connection - we had been set to 100 Full Duplex, and when we try Auto, we would get 100 Half Duplex.  

The Network is set up like this:

Comcast - > Cisco 7200 VXR -> Cisco ASA 5510 -> Dell Power Connect 6248 -> Network

We do have a DMZ switch running on a Cisco Catalyst 2960, which is connected directly to the DMZ interface on the ASA.
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USAVolleyball earned 0 total points
ID: 37736232
Turns out we had some bad cables between switches & routers, brand new box of cables rated for CAT 6!  Oy!
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Author Closing Comment

by:USAVolleyball
ID: 37756305
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