From: Heiko Liedtke (heiko.liedtke@gmx.net)
Date: Mon Nov 27 2006 - 12:22:59 ART
Hi,
now I see the problem... There is a black hole at R4...
My solution would be the sync...
Robert Watson schrieb:
> This does not help. If I learn the 201.200.1.0/24 network from as 54 and
>it gets sent to r1 then R5 will learn of this route through IBGP. Problem
>arises when R5 tries to send packets to destination 201.200.1.0 network
>first hop to get to said network is r4 which is not running BGP so we have a
>problem. I am trying to canvas the community as to what a lab best practice
>would be to resolve. Sync (igp to bgp redistribution) or tunnels or some
>other solution
>
>
>
>-----Original Message-----
>From: Heiko Liedtke [mailto:heiko.liedtke@gmx.net]
>Sent: Sunday, November 26, 2006 1:24 PM
>To: Robert Watson
>Cc: ccielab@groupstudy.com
>Subject: Re: BGP Reachability through non bgp routers - help
>
>I am not sure if you have the possibilty
>to test this in a lab...
>
>There will be no problem for R1 to receive AS254 routes. This is
>BGP as usual.
>The routes are sent to R1 via iBGP with the BB2 address as the next-hop.
>(iBGP does not change any bgp attributes on received routes (if not told
>by you))
>
>If the segment between R5 and BB2 is not routed in your IGP, you might
>have to use the command neighbor xxxxx next-hop-self on R5.
>The AS254 routes on R1 should now have R5 as next-hop and everything should
>be fine.
>Redistributing BGP into IGP is never a good solution. Think about 200k
>routes
>redistributing into OSPF... this will melt down your network in seconds...
>
>Hope this helps
>
>Heiko
>
>
>
>Robert Watson schrieb:
>
>
>
>>Scenario
>>
>>R1 and R5 are ibgp peers in as 100
>>
>>Bb1 in as 54 connected to R1
>>BB2 in as 254 connected to R5
>>
>>There are 3 non bgp routers between R1 and R5
>>
>>R1 - R2 - sw1 - r4 - R5
>>
>>How many different ways can R1 reach as 254 routes behind R5 and what is
>>"lab best practice"
>>
>>Tunnels
>>Sync (redistribute bgp to igp and back)
>>
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>
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