[j-nsp] bgp to ospf

[Richard Zheng]

Hi Joseph,

rtr C belongs to the customer. It only talks bgp with rtr A.

The issue is that redistribution from bgp to ospf on rtrA. It should set the
forwarding address to rtr C's ip. I tried to use 'then next-hop w.x.y.z',
but no effect.

Thanks,
Richard


On Mon, Jun 13, 2011 at 2:39 AM, Joseph Soricelli <joe at proteus.net> wrote:

> 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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>
>