From: Jay Hennigan (jay@west.net)
Date: Tue Aug 05 2003 - 15:56:08 GMT-3
On Tue, 5 Aug 2003, ccie2be wrote:
> Hi,
>
> BGP wouldn't form peers between 2 spokes on a F/R hub and spoke topology.
>
> Here are the details:
>
> R3---------R2----------R1
> spoke hub spoke
>
>
> All routers are running OSPF and the F/R is in subnet 172.16.100.0/24 and the
> f/r interfaces were all left at their default ospf network types -
> non-broadcast. The neighbor command was configured on R2 to allow it to form
> ospf adjacencies with R1 and R3. R1 can ping R2 but not R3 and R3 can ping R2
> but not R1.
>
> R1's loopback interface = 192.168.1.1 and R2's loopback = 192.168.2.2 and R3's
> loopback = 192.168.3.3
>
> The route table of each router shows all 3 loopbacks.
Can you ping and/or telnet to the appropriate loopback from each of the
neighbor routers?
> R1 and R3 can both peer with R2 but they don't peer with each other. I
> thought that as long as there was a TCP path ( the ip addr was in the route
> table), R3 and R1 could peer. But this isn't working. Can someone explain
> why not?
Generally true. "In the route table" != "There is a TCP path", however.
Policy routing, ACLs, and a plethora of other things can result in an
address being in the route table yet unreachable. Don't despair. You
now have a great opportunity to practice your skill with detailed show
and debug commands!
-- Jay Hennigan - CCIE #7880 - Network Administration - jay@west.net WestNet: Connecting you to the planet. 805 884-6323 WB6RDV NetLojix Communications, Inc. - http://www.netlojix.com/
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