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OSPF - NSSA point to multipoint network

ThibaultMean
Beginner
Beginner

Hello All,

I'm dealing with this really odd behaviour.

I have a bunch of routers connected as per the attached diagram.

ospf.gif

I am redistributing the 200.200.200.0/30 network into OSPF on R2

Redistribution occurs as I can see the route installed in R1 routing table.

Now what is really odd is that the show ip route 200.200.200.1 on R1 shows R2, R3 and R4 as valid candidate for the 200.200.200.0/30 subnet.

So basically when I do a debug ip icmp on R1 and start pinging 200.200.200.2 I can see a reply frma R3 saying use R2 as gateway.

I'll add more output shortly.

Any idea ???

Regards,

Thibault.

5 Replies 5

smehrnia
Rising star
Rising star

hi,

what ospf interface type u set on R1 FR?

Hope it Helps!

Soroush.

R1 is multipoint, R2,R3,R4 are point to point. But I as said ip reachability is not an issue.

Going to lab it up now

i think u have a misconfig in OSPF network type (NBMA, Broadcast) on ur devices so the spokes get the original adv and then re-advertise it. or neighbor cost misconfig in case of NMBA.

neway, keep me posted if it wasnt none of the above.

what do u get from show ip ospf database output?

Hope it Helps!

Soroush.

yup, could be something like this.

Will look into this again tomorrow

Thanks for the reply.

I fixed the issue by removing the "redistribute connected subnet" under the router ospf section and replaced it with network 200.200.200.0 0.0.0.3

Need to double check the behavior of of the redistribute connected command in this kind of environment.

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