[c-nsp] Two Cores connected to same eBGP AS

[Keegan Holley]

It depends on your environment, but yes it is safe to connect two internal
routers to the same upstream AS.  You should also configure iBGP or HSRP (but
usually not both)
  to control outbound traffic to AS xyz.  I would also avoid redistributing
BGP into your IGP or vice versa.  You should statically configure what is
advertised into BGP and probably send a default or a subset of routes into
your AS internal routers.  Something like this should really be tuned to
your specific use case though.  garbage in garbage out...

On Fri, Apr 8, 2011 at 6:24 AM, Chris Knipe <savage at savage.za.org> wrote:

> Hi,
>
> I have a quick question...   Let's say I have RTR1 and RTR2
> interconnected and exchanging routes via EIGRP, on AS abc
>
> I now want to connect AS abc from RTR1 as well as RTR2 to AS xyz and
> broadcast my ranges to them, and receive routes from them.
>
> Is it safe to just connect both sessions and let the traffic route via
> RTR1 as well as RTR2, or, considering RTR2 is for a failover scenario,
> how would one automatically achieve a Active/Passive failover scenario
> so that RTR2 will only establish the BGP session when RTR1 is down /
> inaccessible / etc?
>
> Sorry if this is something very common, or very complex - I'm more
> than willing to do some reading up if there can be pointers given
> please.
>
> Both RTR1 and 2 are 6500 series - the amount of routes exchanged will
> be minimal < 100K prefixes.
>
>
> --
>
> Regards,
> Chris Knipe
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