[c-nsp] IOS XR BGP

[Christian Meutes]

Hi,

On Thu, 24 Nov 2011 10:49:18 +0000, Nick Ryce wrote:

> I am moving from Juniper to Cisco ( IOS XR ) and am looking to
> emulate a certain feature ( aggregate addressing for BGP )

in XR you can use RPL for this.

> In BGP on IOS XR you use the network statement network x.x.x.x/19 now
> you need to have an exact route for this ( normally setting a static
> route ).  This will not suit my requirements as if we lose IGP on 
> that
> router I would like to stop announcing the ranges via BGP but the
> static route will still be there and I will theoretically blackhole
> traffic.
>
> Any ideas how to allow BGP to announce an aggregate route when there
> is less specific in IGP would be a great help.

ASR(config-rpl)# if rib-has-route in (10.10.0.0/19 ge 20) then
ASR(config-rpl-if)# pass
ASR(config-rpl-if)# endif
ASR(config-rpl)

Then redistribute your static with "network 10.10.0.0/19 route-policy 
foo"
inside of BGP.

Christian