Re: OER External interface Null0

That's a good question. If you have only one external interface, what's the
point of PfR to begin with? So, I'm thinking that the reasons are not just
making 2nd interface appear, even though I might be wrong. I'm more
thinking of a possibility to use that as an exit interface to drop certain
traffic if a condition is met. I'd struggle coming up with a scenario to
use it in real life though.

--
Marko Milivojevic - CCIE #18427 (SP R&S)
Senior CCIE Instructor - IPexpert
On Mon, Mar 26, 2012 at 18:27, Tom Kacprzynski <tom.kac_at_gmail.com> wrote:
> Hello,
> I noticed that you can specify a Null0 interface as an external interface
> in OER. Does anyone know where you would use that?
>
> The only thing I could see that being used for is if you have to shutdown
> one of the border routers and your total number of external interfaces
> drops below 2 (which causes the master controller to become inactive). By
> configuring a null0 interface as an external interface, the master
> controlled comes up as active.
>
> Are there any other instance where that would make sense to configure a
> null0 as an external interface?
>
> r3(config-oer-mc-br)#interface null0 external
>
>
> Thanks
>
> Tom
>
>
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