[j-nsp] Conditionally Generating Default Routes

[Bill Blackford]

My scenario is quite simple actually. @Mark Tinka hit on it.  A remote ISP
fed by a single fiber path. I want to fail to another connection (cable)
that apparently is fed on a different path. (Not a lot of options in rural
areas).



On Fri, May 8, 2015 at 2:01 PM, Mark Tinka <mark.tinka at seacom.mu> wrote:

>
>
> On 8/May/15 22:40, Saku Ytti wrote:
> > I'm not entirely sure what is the scenario. Is the scenario one where
> you have
> > PE and CE, where PE may become isolated and if such, it should not inject
> > default to CE?
>
> I've seen use-cases for this where customers are asking that if there is
> is backbone failure beyond the local PoP they connect to, any default
> routes announced to them should also disappear. Which makes sense.
>
> >
> >
> > b) generate static route in core boxes, via lets say discard route.
>
> In the use-case I describe above, the issue still remains if the local
> core routers are fine, but the backbone links to the rest of the network
> are down.
>
> In such a case, the only solution would be to originate the default
> route from a core router closer to where traffic normally
> ingresses/egresses the AS. The issue is that in large networks, this is
> not feasible, as traffic ingresses/egresses the network from all sorts
> of locations. It would be easier to focus on guaranteeing backbone
> uptime instead :-\.
>
> Mark.
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>



-- 
Bill Blackford

Logged into reality and abusing my sudo privileges.....