Chris Adams wrote:
I'm trying to originate a default route on a JUNOS router (M10i) that is
Is it BGP, OSPF , ISIS where you 're trying to originate it?
currently default-free. I see recommendations to do "set
routing-options static route default discard", but that seems bad to me
In general in Junos we use "generated" routes - not static ones.
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
"reject" option would give you desired ICMP unreachables.
- 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.
I'm not sure where and how is uRPF applied in your topology but you may
check following link:
http://www.juniper.net/techpubs/software/junos/junos91/swconfig-network-interfaces/unicast-rpf-and-default-routes.html
Angel Bardarov
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