Re: reading ieee 802.1Q spec pdf

From: John Gibson (johngibson1541@yahoo.com)
Date: Wed Apr 11 2007 - 12:21:28 ART

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Before MST, when a port receives a BPDU, the
switch simply adds the port's cost to what
is said about the cost in the BPDU. Then
the switch pass the BPDU on to every other
port.

Now, the port that receives the BPDU is not
related to what cost should be added to
the BPDU. Now the switch has to parse the
M-record, which is the entire picture of
the region, and extract what is related
to ALL the ports in local switch. What
a mess.

So, MSTI's can only start to converge AFTER
IST is converged ?

Hopefully, MSTI's converges in an instances
(depending on the CPU speed) after IST is
converged.

This is the OSPF spirit ? LSA converges first
then compute the routing table in an instance
 (depending on the CPU speed). Someone said
they are following OSPF spirit ?

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