From: ccie2k4@gmail.com
Date: Tue Mar 24 2009 - 22:05:57 ART
Hi i have read that it is not recommended to enable portfast on a switch to
switch interlink however if one switch is a L2 Access Switch and the other
is a central switch if portfast is enabled on the L2 access switch than
there don't seem to be any issues even though physically a loop is created
by connecting to 2 interfaces on the L2 from the central. One just goes into
blocking. The central side is configured for root guard
If portfast is enabled on ports on L2 than wouldn't this provide faster
connectivity since the port won't have to go through all the states and
transition to forwarding instantly. Is there a best practice for such
connectivity even though there are possibilities that a loop might occur.
Also if there was no physical loop (only 1 port) than would it make
difference.
if enable bpdu guard on this port than it will disable it because there are
bpdu's being sent even though both sides are connected as access ports. I
see this happen but is it the correct way
if portfast is enabled than does the port transition instantly. I see that
it does but books always say it bypasses listening and learning stage which
is only 30 sec. spanning-tree is 50 sec hence that still leaves 20 seconds.
Is this true because 20 it seems like ports go to forwarding a lost faster
than 20 seconds or does the 20 seconds affect only during convergence.
thnks
Blogs and organic groups at http://www.ccie.net
This archive was generated by hypermail 2.1.4 : Mon Apr 06 2009 - 06:44:07 ART