[j-nsp] Conditional advertising of default routes

Julian Cowley julian at lava.net
Fri Feb 3 18:37:45 EST 2006

On Thu, 26 Jan 2006, Pekka Savola wrote:
> On Thu, 26 Jan 2006, Thomas Salmen wrote:
>> You could ask your transit providers to send you a default route as well as
>> full routes?
> If they don't have a default route, they might not want to do so, if
> that'd mean they'd have to put a default route in their boxes.
> Actually, we have the same issue as Jee Kay.  Using a default route
> generates all sorts of (difficult-to-notice, and -debug) corner cases,
> but we really don't want to push full 200K routes on all our routers
> either..

Can you expound on these corner cases?

When we took a look at this issue last year, we came to conclusion
to always originate a default route from both of our Junipers
simultaneously.  This sounds exactly like Jee Kay's configuration now.
Even if its upstream link goes down, a router can still be used as
a gateway since it will just punt to the other router via OSPF or iBGP.

We've had more problems with using a default network (in Cisco
speak) where you look for a particular route from your upstream.
If that network disappears, the router will silently stop announcing
a default route.

"Seemed like to me would make them a step closer to achieving that
objective and we have an obligation in order to keep the peace to
work together to achieve the objective that we're trying to achieve
through the current diplomatic process." -- George W. Bush

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