IERS Lab4 Task1.3 - Loopguard and UDLD

Experts,

I have a question about UDLD and Loopguard in one of the IERS labs. I don't
think that loopguard is needed at all here. Why would you have to worry
about SW1 making the Fa0/15 a designated port if UDLD has already taken the
port down? By default UDLD acts faster than Loopguard by default right?

Task

  Administrators of your network are concerned about SW1 and SW2 not
  being able to detect a link failure on port Fa0/15.

 Configure SW1 and SW2 so that port Fa0/15 is brought down in the case
  that either switch can send traffic, but not receive, or vice versa.

 As an additional precaution, configure SW1 so that interface Fa0/15 is not
  mistakenly elected as a designated port in the above case.

Answer

SW1:
interface FastEthernet0/15
 udld port aggressive
 spanning-tree guard loop
SW2:
interface FastEthernet0/15
 udld port aggressive

-Mike

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Received on Sun Jan 24 2010 - 04:05:43 ART