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) as10.250.1.2/30 RTRC - 10.250.1.9/30 with the cloud being Vlan 4 - 10.250.1.10/30 RTRE - 220.127.116.11/30 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 0.0.0.00.0.0.0 into RIP
3) Redistribution or RIP into BGP permitting the subnets of router C10.250.1.8/30 & 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 of10.250.1.10/30. 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 ?