[c-nsp] BGP partial routes and partial carrier failures

[Paul Wozney]

Someone on another forum suggested using IP SLA and EEM to react to network
changes.  It's definitely an idea.

On Thu, Oct 2, 2014 at 11:46 AM, Paul Wozney <paul at wozney.ca> wrote:

> Okay so I've got two BGP routers here, accepting partial routes - one
> carrier to each router. Each carrier advertises a default route. I use an
> as-path filter to limit learned routes to those of the carrier +1 ASn:
>
> ip as-path access-list 11 permit ^NNNN_[0-9]*$
>
>
> One carrier has now had two outages in the last year where they've lost
> their upstream. They continue to advertise a default route to us, so our
> network experiences failures until we kill the link.
>
> It strikes me that if we had FULL routes (and no default route accepted) we
> could react automatically to failures like this - we could share tables
> between the routers and if one carrier lost half their routes we'd pick
> them up from the other router.
>
> Is this just how life with partial routes is? Or is there something else I
> can do?
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