[j-nsp] Originate a default route

[Masood Ahmad Shah]

You can advertise default route by using policy routing like this...

---Create a policy---

policy-statement default-originate {
    from {
        route-filter 0.0.0.0/0 exact;
    }
    then accept;
}

---Apply the above policy to OSPF---

protocols {
        ospf {
            export default-originate;


Regards,
Masood





-----Original Message-----
From: juniper-nsp-bounces at puck.nether.net
[mailto:juniper-nsp-bounces at puck.nether.net] On Behalf Of Chris Adams
Sent: Monday, July 28, 2008 7:55 PM
To: juniper-nsp at puck.nether.net
Subject: [j-nsp] Originate a default route

I'm trying to originate a default route on a JUNOS router (M10i) that is
currently default-free.  I see recommendations to do "set
routing-options static route default discard", but that seems bad to me
for a couple of reasons:

- changes routing behavior: normally attempting to go to an IP with no
  matching route returns network unreachable, but discard just drops

- changes uRPF behavior: loose-mode uRPF is now meaningless

I think using "reject" instead of "discard" would keep the same routing
behavior.  However, since JUNOS treats "discard" and "reject" as valid
destinations for uRPF (unlike Cisco IOS and interface Null0), I don't
see a way to originate a default route (since JUNOS can't just originate
a default route like Cisco IOS) and still have useful loose-mode uRPF.

Is there any way around this?
-- 
Chris Adams <cmadams at hiwaay.net>
Systems and Network Administrator - HiWAAY Internet Services
I don't speak for anybody but myself - that's enough trouble.
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