From: Ben-Shalom, Omer (omer.ben-shalom@xxxxxxxxx)
Date: Wed Nov 14 2001 - 07:22:16 GMT-3
Hi.
I have a question on the way to handle link state protocol route metrics.
In all protocols that are not link state a router will essentially send
knowledge of routes it knows , how to get there and the metric so if you
make a change in a router by, say, using a route map it will send this
information along and you can influence other routers in the domain to go
through you or not going to that route.
Now for the link state.
Suppose I have 2 OSPF routers and I want to influence users to go through me
going to some destinations, how can this be achieve, I may be missing
something easy here but my understanding is that all routers have the same
database so I cannot influence the cost of any link that I don't own.
Seems to me this prevents me from getting what I want unless I an ASBR/ABR
that creates a new type of LSA (by summarization for example or by changing
LSA type etc).
To some up -
If there are 2 ABR's to an area I think you can influence which one is
preferable to go to a specific destination outside the area by manipulating
a summary route you create (but can I have a summary route which remains the
same ?) but if I have 2 routers in the same area I cannot influence which
one is chosen by other routers to go to specific destination just influence
the cost of my own links.
Any clarification on this will be welcome.
Also - if anyone can please recap what happens to LSA's going from one area
to the backbone to another area, which LSA types are involved and which
points in the path can influence the metrics in passing (and in which ways)
that will be super.
Thanks
Omer.
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