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Swapped 2501 with a 2621 router, but Frame Relay went crawling?!

Just replaced the 2501 router with 1 2621 router for a customer. They are running a frame-relay circuit 256k. All we did is configure the same exact configuration on the 2501 to the 2621. After it went online, the connection was extremeley slow. We can telnet to the 2621 router, but barely can do anything to it. Finally, replaced the old 2501 in its place, and the circuit was ot its normal speed. The only thing different between the two routers is the Serial cable, which the 2621 uses the Fast Serial small type. Can a bad cable yield a slow connection like this, instead of no connection? Here;s the configs on the Serial port. Any help o rsuggestions would be appreciated. Thanks,

Tarek

interface Serial0

description 256KB Frame-Relay Circuit to Bell South

mtu 5000

ip address 172.21.146.30 255.255.255.252

encapsulation frame-relay IETF

bandwidth 256

frame-relay interface-dlci 545

frame-relay lmi-type ansi

2 REPLIES
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Re: Swapped 2501 with a 2621 router, but Frame Relay went crawli

Tarek,

It is always possible that a bad cable can cause a slow connection. It may cause errors on the line. When you do a "show interface s0" command, do you see input errors incrementing? The best indicator of output errors would be if you see an increasing number of status timeouts in the output of the "show fram lmi" command.

Good luck,

Mark

Re: Swapped 2501 with a 2621 router, but Frame Relay went crawli

There is another major difference between 25xx and a 2621: the LAN interface are 100Mb instead of 10. Could it be that you have a speed/duplex mismatch on the LAN interface?

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