[j-nsp] Conditionally Generating Default Routes

[Mark Tinka]

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.