We have 2 routers, both with a default route that speak BGP to each other (over multiple sessions, one for each link).
Router A is advertising a default route to Router B and I can see that in my route table, but Router B doesn't appear to be advertising one back to Router A even though it has its own route. Both routers have "default-originate: if installed".
This is what I see on Router B:
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[admin@bdr1.edpk.xyz.com.au] > ip route print where dst-address=0.0.0.0/0
Flags: X - disabled, A - active, D - dynamic, C - connect, S - static, r - rip, b - bgp, o - ospf, m - mme,
B - blackhole, U - unreachable, P - prohibit
# DST-ADDRESS PREF-SRC GATEWAY DISTANCE
0 ADb 0.0.0.0/0 103.AAA.BBB.3 103.AAA.BBB.22 15
1 Db 0.0.0.0/0 27.CCC.DDD.165 90
2 S 0.0.0.0/0 27.CCC.DDD.165 27.CCC.DDD.165 99
3 Db 0.0.0.0/0 103.AAA.BBB.3 103.AAA.BBB.30 15
[admin@bdr1.edpk.xyz.com.au] > routing bgp advertisements print "XYZ - MOR (DF)" where prefix=0.0.0.0/0
PEER PREFIX NEXTHOP AS-PATH ORIGIN LOCAL-PREF
What I'm trying to achieve is that each router knows that there is a default route via the other side should its own upstream fail. We're also, through weights, trying to make sure that Router B only uses its own upstream if Router A is not reachable. Ultimately I want Router B to advertise a Route (for 27.CCC.DDD.165) to Router A that can be used by Router A if its normal default route is lost (which it also learns by BGP).
Filters definitely allow the default route to go out to the other side.
Can anyone tell me what I'm misunderstanding?
