Comware

hi,
i have replaced an old switch with an hp 4204vl. and Since then i getting an error "Excessive late collisions & Excessive crc" on the trunk that i configer.what can be the Reason and how can i fix it??

'late collisions' can indicate a duplex mismatch -- one side thinks it's in full-duplex mode & the other is in half-duplex

you could check that and force full-duplex if needed

glen

Although if you don't have ancient busted kit at the other end of the links to the 4204vl my personal suggestion would be to set both ends to autonegotiate.

How do I configer autoneg?

I assume that on the new HP 4204vl that autoneg is already enabled. That would imply that the configuring that needs to be done would be on the other end, which will depend entirely on what that happens to be.

Is the Trunk Fibre or Copper?

On the ather side i have Switch 5412zl.
and the trunk is copper.

Starting at www.hp.com, click on "Support & Drivers." Then enter 5412zl in the box and hit enter. In my case I then selected the "HP E5400 zl Seitch Series" link, then "Manuals" down in the Resources section. There should be a command line reference there (several versions actually, pick the one which matches the firmware running on your switch. If you scroll down far enough there will also be a "Getting Started" section, and then farther still will be a "Setup and Install - general" section with a few promising-looking titles in there as well.

Thank you very much for your help.