Question - OSPF N and E route... (intra vs inter) **

 I think area 1 is your NSSA and R2 is your ABR R2 has the highest router ID
and will do the type7 type5 translation. It than is forwarded to R1 via area
0.

Please post your configuration and a show ip ospf on R2 and R1

Kind regards,

Maarten Vervoorn

2010/10/27 sp-ie m <sp.ccie.me_at_gmail.com>

Hey guys,
>
> I'm confused if Intra-area N1 will be left out and Inter-Area E1 will
> be chosen if E1 is seen from highest router-id NSSA ABR .
>
> I hv a square topology.
>
> Area 1 is NSSA.
>
> R1-----Area0-----R2
> | |
> Area1 Area1
> | |
> R3-----Area1-----R4
>
> R1-R2 in Area 0.
> R1-R3 in Area 1
> R2-R4 in Area 1
> R3-R4 in Area1.
>
> Router ID R1 = 1.1.1.1
> R2 = 2.2.2.2
> R3 = 3.3.3.3
> R4 = 4.4..4.4
>
> Question: Both R3 and R4 are redistributing a static route 134.1.1.0
> into Area1. R3 is redistributing it as N1 while R4 as N2.
> On R2, I can see it receives 134.1.1.0/24 as N1 from R4. This makes
> perfect sense as N1 is pref over N2.
>
> On R1, I can see it receives 134.1.1.0/24 as E1 route from R2 but the
> next hop is R3's interface IP. This part is tricky.
> Which rule says that E1 from Inter-area neighbor will supersede N1
> from local area?? I know this is somehow happening coz R4 has highest
> router-ID NSSA ABR but dont quite understand how intra-area N1 is left
> out and Inter-Area E1 is chosen.
>
> Tried a cursory look in few popular workbooks but didnt find similar issue.
>
>
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Received on Wed Oct 27 2010 - 19:27:26 ART