From: Sage Vadi (sagevadi@yahoo.co.uk)
Date: Sun Mar 02 2003 - 01:29:59 GMT-3
All of these costs are unidirectional in nature. In
your A to B example, none of these costs as set on A
will change B's perspective of the cost of the B to A
link. Said another way, there are two links here,
BtoA and AtoB. The AtoB link is assigned a cost on A
and the BtoA link on B. You can't set the cost of
BtoA from A. Furthermore, it has a lot to do with the
use of an spf-like algorithm which is a typical
characteristic of link state protocols.
NB: I do not agree with your above quote. Example:
NetworkB---R1-----R2---NetworkA
Using OSPF we can manipulate the cost of NetworkB as
R2 receives it, by doing it locally on R1 itself.
People get confused as they try to manipulate metrics
on directly connected interfaces, which is generally
pointless.
Can the same thing be done in ISIS?
As you said to accurately see this I would have to
recreate it, which I will... when I have time...
I believe it can but possibly the interfaces cannot be
a pure L1, if the router that is receiving those
routes is a pure L2, in my situation: I have tested
this and the pure L2 router does not receive the
metric.
...
Sage
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