This is usually done by originating your prefixes on the core router.

In your case, set up a BGP session with the router on the other side of
the link, and originate your prefix from there.

Core router <-- iBGP --> Border router <-- eBGP --> Peer router

On the core router you have `network x.x.x.x/x` in your configuration.
On the border router you don't have any `network` prefixes, just
advertise the prefixes you get from the core router to the peer.

When the link between the core and border router goes down, you will
stop advertising the prefixes to the peer (so the traffic will be routed
over a backup path).

On 2017-01-11 05:03, Muenz, Michael wrote:
> Am 09.01.2017 um 10:35 schrieb Muenz, Michael:
>>
>>
>> I'm using the network statement in BGP and in Zebra have a Null Route
>> for the prefix. My thought to solve this explicit issue is to set a
>> route for the prefix via internal IF, so when the NIC is down R1
>> doesn't advertise any networks.
>>
> 
> Ok, this doesn't work, tested it, shut down eth1 and the network was
> still advertised.
> Also I got in a bit trouble, because not every network in the assigment
> is in use, so it tries to find it on eth1 and I ended in full arp cache :)
> 
>> Not really sure if this is really the way how to solve situations like
>> these? I also read about bgp conditional advertisement, but perhaps
>> this is a bit oversized for a small network?
>>
>>
>> Any ideas? Or is a route via internal just fine?
> 
> So I'm back at the beginning, any ideas how to solve this with quagga?
> 
> Thanks,
> Michael
> 
> 

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