On Mon, Oct 29, 2007 at 01:40:07PM -0700, Aaron Glenn wrote:
quoted text > running 4.2/i386 as of two weeks ago, I've got a default route that
> isn't being seen as valid and consequently not installed in the RIB.
> when I first rolled this router out, however, it was valid and being
> installed. while I'm interested in what could have happened between
> then and now, I'm more interested in how the RDE actually makes its
> decisions on validity. I see no obvious reason for this route to be
> not valid.
>
> everything else (demotion, 'prefix lists', etc) works great, however (-:
>
> relevant info:
>
> root@edge-rtr-2$ bgpctl show rib nei 38.103.65.50 in
> flags: * = Valid, > = Selected, I = via IBGP, A = Announced
> origin: i = IGP, e = EGP, ? = Incomplete
>
> flags destination gateway lpref med aspath origin
> 0.0.0.0/0 38.103.65.50 100 0 174 i
>
> I am learning that nexthop from another session with 174:
>
> root@edge-rtr-2$ bgpctl show fib bgp
> flags: * = valid, B = BGP, C = Connected, S = Static
> N = BGP Nexthop reachable via this route
> r = reject route, b = blackhole route
>
> flags destination gateway
> *B 38.103.65.50/32 38.104.XXX.37
>
> root@edge-rtr-2$ cat /etc/bgpd.conf
> AS 10XX0
> router-id 72.37.XXX.178
>
> network inet connected
> network inet static
> network 38.98.XXX.0/24
>
> neighbor 72.37.XXX.177 {
> remote-as 10XX0
> announce all
> }
>
> group "COGENT" {
> remote-as 174
> depend on bge1
> softreconfig in yes
> softreconfig out yes
> neighbor 38.104.XXX.37 {
> local-address 38.104.XXX.38
> set prepend-self 3
> announce self
> }
> neighbor 38.103.XXX.50 {
> announce none
> multihop 8
> }
> }
>
>
The nexthop depends on a bgp route which is considered evil and therefor
not allowed by default. Add "nexthop qualify via bgp" to the global config
part and your setup should work again.
--
:wq Claudio
