Troubleshooting LAN/WAN problems

[marcospce]

Hey guys,

What informations are important in a sh interface (port) command to troubleshoot a problem ?

What i have to look ? What is the normal and problematic numbers ?

[allan.thomas]

There are four aspects which I would initially be aware of when troubleshooting an interface, these are as follows:

Verify that the Line and Protocol status are both UP.

Verify that the Reliability is 255/255, any thing less would indicate a physical issue.

Verify that the a LAN interface for example is operating at the correct speed and duplex.

Ensure that there are not errors occuring, such as CRC, collisions/multiple collisions, and packet drops.

Hope this helps

Allan.

[Kevin Dorrell]

If it is a serial line, here is a good document that tells you about the command:

http://www.cisco.com/univercd/cc/td/doc/cisintwk/itg_v1/tr1915.htm

If it is a switch port, this is the document:

http://www.cisco.com/en/US/products/hw/switches/ps700/products_tech_note09186a008015bfd6.shtml

Hope this helps.

Kevin Dorrell

Luxembourg