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Hello I have 8 routers Connected to a central office. Can ibgp be used
instead of ospf or eigrp? why not? what are the disadvantages?

bgp work on tcp so you can peer with others if they are directley
connected . If they are not then you need some way of learning the
route to that destination before you can peer with the remote end.
there are few well written bgp guides on cisco.com have a look at them.


There is no hard and fast rule what protocol is the best and what you
should use in your network . If ospf can get what you need then that if
bgp get you your results then use that. Make sure you understand how
each protocol works and how your network can benifit from them after
all you are the one going to be woken up at night if it goes down.

http://groups.google.com/group/Netwo...436b14b17aaee2

What if my networks are behind nat. Can I create crypto maps and set up
the routing to go inside nat? does this make a difference? Can I do
this with ibgp? Thanks
cisco wrote:
> http://groups.google.com/group/Netwo...436b14b17aaee2

In article < .com>,
<> wrote:
>What if my networks are behind nat. Can I create crypto maps and set up
>the routing to go inside nat? does this make a difference? Can I do
>this with ibgp? Thanks

Not really clear what you are asking for... but if you need routing
through an IPsec tunnel or through a firewall doing NAT, your choices
are pretty much limited to either a GRE tunnel or BGP. My preference is
BGP, but a GRE tunnel can be easier. Either way, if you're routes are
going through a NAT translation, it's a bit tricky to get the
forwarding tables to be correct (the next hop advertised by the routing
protocol does not get translated by NAT, so you have to force it to be
correct. This is trivial with BGP, or can be done indirectly using a
static route.

Depending upon your environment, you may also need to worry about how
much you can trust the routes advertised on the other side of the
firewall. See the white paper on my web site on supporting redundant
firewalls for a paranoid example. You may also get some hints from the
redundant VPN white paper, also there.

Good luck and have fun!
--
Vincent C Jones, Consultant Expert advice and a helping hand
Networking Unlimited, Inc. for those who want to manage and
Tenafly, NJ Phone: 201 568-7810 control their networking destiny
http://www.networkingunlimited.com

Thanks for the help i was starting to think it could not be done.
In this link
http://www.cisco.com/warp/public/459/bgp-toc.html

talks about using bgp to redistribute eigrp. That could be a good
option. But setting bgp alone could do the job too.
Thanks.