[j-nsp] bgp to ospf

[Richard Zheng]

Hi,

We have the following setup. RTR A speaks multihop BGP with CPE router C.
Router B is in the middle, and doesn't speak bgp. We redistribute BGP routes
on rtr A into OSPF. There is a filter to only allow specific routes learned
from rtr C. However OSPF external route redistributed at rtr A has a forward
address 0.0.0.0. So rtr B still sends traffic to A, which causes a loop.

How do I let rtr B know to send traffic to rtr C for routes learned from rtr
C?

 ----------                  --------------                 -----------
| BGP rtr A |  ============ | no-BGP rtr B |  ============ | CPE BGP C |
 ----------                  --------------                 -----------

The router filter is

term customer-A {
    from {
        protocol bgp;
        route-filter x.y.z.0/24 exact;
    }
    then accept;
}
term reject-others {
    then reject;
}

The ospf external route on rtr B is like this,
        Type-5 AS External Link States

  Routing Bit Set on this LSA
  LS age: 89
  Options: (No TOS-capability, DC)
  LS Type: AS External Link
  Link State ID: x.y.z.0 (External Network Number )
  Advertising Router: a.b.c.c (which is rtr-A's loopback)
  LS Seq Number: 80000001
  Checksum: 0xD32E
  Length: 36
  Network Mask: /24
    Metric Type: 2 (Larger than any link state path)
    TOS: 0
    Metric: 0
    Forward Address: 0.0.0.0
    External Route Tag: 0

Thanks,
Richard