where to get answer of any error

[krahulbgp]

where to get answer of any  error detected in logs of cisco switch & router

[balaji.bandi]

Most cisco documented most of the errors and how to resolve those.

if any specific if not listed then contact TAC for help.

each Router and Switch have their own Logs information - based on test scenarios or errors.

[krahulbgp]

Is TAC supporting free if yes what is contact id

[balaji.bandi]

TAC supports is not free, if you have contract with cisco with the product - you can contact.

visit cisco.com (and check for support help - if you have contract)