[j-nsp] Conditionally Generating Default Routes

[Payam Chychi]

On 2015-05-08, 5:01 PM, Mark Tinka 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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Hi,

Could you not simply do this at multiple locations and utilize 
preference values to create more of a pre-deterministic behavior?

I do apologize if ive missed the point on this