Cisco 4006+4013+4232-L3 Bandwidth / Speed

Aug 16, 2007

I have a Cisco 4006 with a 4013 Supervisor and a 4232-L3 and 3 x 4148-RJ modules.

When downloading data from ServerA on the switch to ServerB on
the switch the download speed is limited to about 650KB/sec.

ServerA -> ServerB = 650KB/sec.

ServerB -> ServerA = 11MB/sec.

So the problem is in one direction.

Each server has its own VLAN and a /29 IP block and both servers are physically connected to the 4006's 4148-RJ modules.

This seems to affect servers at random.

This issue disappears if I change the /29 IP block on the server experiencing the slow downloads while still using the same VLANs and ports to a /29 not experiencing this issue.

When I change the /29 to one that is not affected the switch is capable of full wire speed which is approximately 11MB/sec sustained. When I change back to the old /29 the downloads are limited to about 650KB/sec max.

I have tried the following:

changing VLANs

changing ports on the 4006

replaced CAT5 patch cords

replaced NICs in affected servers

replaced motherboards in affected servers

had multiple people examine the configs

and a few other crazy ideas yet the problem persists.

This problem affects only a few servers on the switch however I have a similar problem on a larger group of servers as well.

Several servers are limited to 650KB/sec downloads from very fast servers outside the network on the public internet.

For example:

LocalServerA on the 4006 with a /29 is downloading from RemoteServerA on the internet and is getting about 650KB/sec.

RemoteServerA -> RemoteServerA = 650KB/sec

LocalServerB on the 4006 with another /29 is downloading from RemoteServerA on the internet and is getting 3-8MB/sec sustained.

RemoteServerA -> LocalServerB = 3-8MB/sec

If I change the /29 on LocalServerA to a /29 which is unaffected by this issue the speed problem disappears while still using the same hardware, VLANs and physical ports.

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