Runts Incrementing

[SSChris]

I have 4 remote offices connected. For reasons I won't explain here, our setup has the connection from our WAN carrier plugged into a Cisco 2900 switch, which then connects to our Cisco 1900 router, which 1-arm routes back to the switch, where the users are plugged in.

On each of them(the 2900s) the switch port that connects to the router is reporting that anywhere from 1/5-1/3 of the total # of packets received are undersized, or runts.

Somehow I am not seeing any noticable performance degredation.

Is this something I should be concerned about, and if so what may be the problem?

Thanks.

 

[vipergg]

Yes you should look at it , you probably have a speed duplex mismatch that should be fixed . If possible you should hardcode all the connections to 100/full duplex if possible between the switch and router , if not 100 then 10/full . The only reason you should be getting runts is either a speed duplex issues or your conections are running half duplex and the connection is overly busy , either way your speed is not as fast as it could be if you weren't getting these . 1/3 is a lot and these are all packets that have to be retransmitted when this happens .

 

[plshlpme]

basically it means your getting collisions somewhere

 

[SSChris]

Both sides of each link are hard set to 100/full.

I am not seeing collisions anywhere.

Could this be "bad" cabling or ports?