From: Brian McGahan (brian@xxxxxxxxxxxxxxx)
Date: Mon May 06 2002 - 17:28:04 GMT-3
Jason,
It shouldn't be working that way. They should both be learning
the networks that R2 is advertising, but their peering will be in race
state. If R3 isn't learning about the link between R1 & R2, then you
have a wrong configuration on R2. Most likely you have a malformed
'network' statement under BGP. If R2's directly connected interfaces are
204.156.20.0/30 and 165.40.22.0/23, then R2 should say:
Router BGP 3127
Network 204.156.20.0 mask 255.255.255.252
Network 165.40.22.0 mask 255.255.254.0
Double check this and report back.
Brian McGahan
CCIE #8593
brian@cyscoexpert.com
CyscoExpert Corporation
Internetwork Consulting & Training
http://www.cyscoexpert.com
Voice: 847.674.3392
Fax: 847.674.2625
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Jason Wydra
Sent: Monday, May 06, 2002 3:01 PM
To: Carlos G Mendioroz
Cc: Groupstudy ccielab list
Subject: Re: IBGP HELP??
I'm not running an IGP yet R1 learns about R3 via R2. I have a network
statement on R2 for both links to R1 and R2. R1 has the route to R3 in
its bgp and ip route table. R3 learns nothing from R2 about networks on
the R1 side. Need to put a static route in on R3 pointing to R2 as next
hop for the TCP connection to come up.
Carlos G Mendioroz <tron@huapi.ba.ar> wrote: Jason,
What IGP are you running ?
How is R1 supposed to learn how to reach R3 ?
Remember that iBGP will never (well almost never *) relay
information, so you need some IGP to do that.
(Hmm, you said that R1 has learned via BGP the 165.40.22.0/23,
so it has to be originated at R2, may be by a network command.
Do you have a simmilar network command for the 204.156.20.0/30 ?)
(*) The "almost never" relates to setups like route reflectors,
where you get a controlled iBGP redistribution.
HTH.
Jason Wydra wrote:
>
> I have AS 3127 with 3 routers. R1 is connected to R2 via Token ring.
R2 is connected to R3 via Ethernet. R1 and R3 do not have a direct
connection. They are attempting to peer through R2. R1 and R2 neighbor
states are active. R2 and R3 neighbor state is active. R1 and R3
neighbor state will NOT come up. The network on link between R1 and R2
is 204.156.20.0/30 and network between R2 and R3 is 165.40.22.0/23. From
R1 I CANNOT ping R3. R1 has learned a route from BGP to R3. Looking on
R3 it has not learned a route to R1 (From R2). This is obviously why I
cannot ping from R1 to R3 and this is also why the BGP peer won't come
up. Simply adding a static route on R3 pointing to R1 solves the problem
and my BGP peers comes up. My question is why does R2 tell R1 about the
165 network but R2 does not tell R3 about the 204 network? Why do I have
to add a static to R3? Please help!!
>
> Jason Wydra
>
> CCNP,CCDP
>
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