[quagga-dev 10454] Re: OSPF: External Prefix Summarization

Joachim Nilsson troglobit at gmail.com
Sun Apr 21 17:45:38 BST 2013

On 04/21/2013 03:30 PM, Ján Janovic wrote:
> There is a one more idea in my head. Maybe you(or somebody else) could 
> help me with
> that. As you know for sure, when you start summarization on Cisco 
> devices,
> "discard" summary route is added to route table to prevent routing loops.
> Is there a possibility to add such a route in linux? And from Quagga 
> code?

Or is it a null route you're referring to?

     ip route tun0
     ip route eth0 10
     ip route null0 255

If tun0 is up it runs as default gateway, otherwise, eth0 and as a last 
the null0 route will act as a blackhole.


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