From: ihatecisco@att.net
Date: Sat Mar 20 2004 - 04:06:27 GMT-3
[this is not a complaint, just a topic]
I saw on here previously someone was talking about redistributing OSPF into
BGP. I have decided to create this e-mail partially to expound upon the
subject, to study, and i can't sleep. lol. always a good reason.
BGP - The Joy of Synch
We all love to use the 'no synch' command, but sometimes its just not
fashionable. Or rather just not allowed. In order for BGP to recognize the
route as being in the IGP the BGP and the OSPF (or possibly other protocol's
router id - if existant) must match.
IBGP to OSPF(IGP)
This is another fun one, which i don't even recall if this command is in
parkhursts book.
bgp redistribute-internal
http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122cgcr/fiprr
p_r/bgp_r/1rfbgp1.htm#wp1221038
this command is neaded to redistribute IBGP routes into the IGPs.
OSPF into BGP
This is the item of discussion that i ran across in the list that i was either
not aware of, or just simply forgot in terms of messing with everything. So
it looks like i am going to be reading ospf network design solutions 2nd
edition (pg 673) & the ospf command & configuration book again.
Someone was right. if you use the
router bgp 100
redist ospf 1
you only get internal ospf routes into bgp. SO i would recommend brushing up
on this. because i am about to take the lab, and i think this could have
potentionally sunk me.
So thanks Mr Richard Dumoulin & Joseph D. Phillips
OSPF router ids.
i am always forgetting to do this. just make it a habit. you will be happy
about it later.
Distance Commands:
these distance commands are tricky with OSPF. you have to use the OSPF router
id for the neighbor in order for it to work right. (This could be for just
areas that have DRs, i still need to play with this some more) This isn't
specifically listed in the documentation but it is in parkhurst's book. Saves
some time and frustration.
http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122cgcr/fiprr
p_r/ind_r/1rfindp1.htm#wp1017503
Virtual-Links
Not much to go into about this right now. not to mention my eyes are getting
very sleepy.
Virtual Links are just that. they are virtual links to the Area 0 / Backbone
area. So if you have authentication on the backbone you are going to need to
have authentication on the virtual links, unless you specifically disable
authentication on the virtual links. Again i would recommend testing.
Other things that i tend to forget.
Whenever you do redistribution on an OSPF router, it becomes an ASBR
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