2 routers connected back to back, 10% packet lossed, why and how to solve?

[llgg_716]

2 routers connected back to back with 100M FastEthernet, 10% packets lossed, why and how to solve?

[ciscomoderator]

The focus of this board is Virtual Private Networks, however, there are a number of professionals online who may be able to assist you. We are always considering additional forums for such topics and I will make a note of your post.

If you don't get a suitable response to your post, you may wish to review our resources at the online Technical Assistance Center (www.cisco.com/tac) or speak with a TAC engineer. You can open a TAC case online at www.cisco.com/tac/caseopen

If anyone else in the forum has some advice, please reply to this thread.

Thank you for posting.

[saumen.sarkar]

Check the cable or change it - then set both routers ethernet ports as 'auto' - and also check for the type of crossover cable you are using -and what is the minimum length requirement also.

[faheyd]

The router ports should be set to 'duplex full', not auto. Make sure you have your 'cat 5' wires set to 1,2 looped to 3,6. You may also have to beef up the 'buffers' statements to get the ports to run 'wire' speed. I've never tried it, but you may be able to up your MTU's also. You should have identical router config's on both sides for those. A secret tip from me to you: Make your back-to-back cable at least 2 meters long, and see if that improves your packet loss.