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Posted by Darren Green on July 29, 2006, 5:22 am
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Diagram didn't come out properly - enclosed txt file with it on.
>I would be grateful if someone could help clarify why this happens in my
>lab
> mock up. First the description....
>
> Network as follows:
>
> RTRA(eBGP) -877
> RTRC(RIPv2) - 877
> |
> |
> 192.168.1.0/24 |------------MPLS Cloud -----------------|
> 192.168.2.0/24
> | (1800 Router)
> |
> | |
> |
> | |
> |
> RTRB (eBGP) - 877| |
> RTRD(Backup ISDN) - 801
> | |
> |-------RTRE (2801)
> (eBGP)
>
> Rtr A, C,E MPLS facing WAN Links - 10.250.1.X/30
> Rrt B & Rtr E links - 172.16.1.0/30
>
> On the left hand side of the diagram, I have 2 x routers, 1 (A) x connects
> to my MPLS Cloud (rtr 1800), the other (B)
> connects to router E. All links into the cloud (other than the ISDN router
> as it's not configured yet) & router B are /30
> point to point links as follows:
>
> Router A - 10.250.1.1/30 with the corresponding port on the 1800 (VLAN2)
> as
> 10.250.1.2/30
> RTRC - 10.250.1.9/30 with the cloud being Vlan 4 - 10.250.1.10/30
> RTRE - 110.250.1.13/30 with the cloud being Vlan5 - 10.250.1.14/30
>
> The cloud 1800 is providing the following role:
>
> 1) Pushing a default route (default information-originate) into the cloud
> so
> that my remote sites 192.168.X.0/24 have a
> default route from router E which onward connects to the Internet.
>
> 2) Redistribution of eBGP routes via a route-map permitting only 0.0.0.0
> 0.0.0.0 into RIP
>
> 3) Redistribution or RIP into BGP permitting the subnets of router C
> 10.250.1.8/30 & 192.168.2.0/24 to pass to router
>
> When looking at the routing table of router C - I find the following
> subnets:
>
> 10.250.1.0 /30 - WAN subnet from router A
> 10.250.1.12 /30 - WAN subnet from router E
>
> Both of the above are learned via RIPV2 with a next hop address of
> 10.250.1.10/30. How can this be ? - If my redistribution on
> my 1800 router is only permitting the BGP learned route of 0.0.0.0 to be
> injected into RIP, why does router C learn of the
> WAN subnets from router A and E when I have not permitted them.
>
> Is this all because my simulated WAN cloud is 1 x router ?
>
> Regards
>
> Darren
>
>
begin 666 Diagram.txt
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H"7P)? T*"0D)?"TM+2TM+2U25%)%("@R.# Q*0T*"0D)"2AE0D=0*0``
`
end
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