[j-nsp] bgp to ospf

[Joseph Soricelli]

Richard-

IIRC, in the "customer-A" term configuring "then next-hop w.x.y.z"  
with rtr C's loopback address should set the forwarding address to rtr  
C.

Assuming that rtr C is running OSPF, is there a particular reason that  
rtr C can't redist its own routes into OSPF?

-joe

Joseph Soricelli
JNCIE #14/ CCIE #4803
703-980-3999
joe at proteus.net
Twitter - @proteusnetworks



On Jun 13, 2011, at 6:42 AM, Richard Zheng wrote:

> 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
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