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New Member

NSSA ABR not translatingType 7 LSAs to Type 5

i'm not sure why it won't translate, i have two NSSA ABRs, one of them (highest RID) shows that it should be translating the LSAs from 7 to 5 but does not. I do see Type 7 LSAs in the Database. This is on a 6509 running 12.2(18)SXF8. Has anyone seen this before?

  • LAN Switching and Routing
1 ACCEPTED SOLUTION

Accepted Solutions
Cisco Employee

Re: NSSA ABR not translatingType 7 LSAs to Type 5

Andy,

Looking at the database entry for the type 7 lsa, we can see that the routing bit is not set. It could be that the forward address is not learnt via ospf or that the type 7 itself is not installed in the RIB (also learnt via another protocol with better AD).

Can you post the output of a "show ip ro 10.255.30.0" and "show ip ro 10.250.1.230".

Regards,

18 REPLIES
Hall of Fame Super Silver

Re: NSSA ABR not translatingType 7 LSAs to Type 5

Hello Singh,

does your router receive the type 5 LSA generated by the other NSSA ABR in area 0 ?

May you post the output of show ip ospf database about the type 7 LSA on both NSSA ABR routers ?

I wonder if seeing that the type 5 LSA is already in the database the router does not translate. May be because the other router is advertising a better metric or has done before.

hope to help

Giuseppe

New Member

Re: NSSA ABR not translatingType 7 LSAs to Type 5

Both routers have similar Databases. R2 shows that it should be converting.

Re: NSSA ABR not translatingType 7 LSAs to Type 5

what is your problem?

New Member

Re: NSSA ABR not translatingType 7 LSAs to Type 5

Type 7 LSA and not being converted to type 5 and those routes are not getting advertised out to the rest of the OPSF domain

Re: NSSA ABR not translatingType 7 LSAs to Type 5

http://www.ietf.org/rfc/rfc1587.txt

4.1 Translating Type-7 LSAs Into Type-5 LSAs

This step is performed as part of the NSSA's Dijkstra calculation

after type-5 and type-7 routes have been calculated. If the

calculating router is not an area border router this translation

algorithm should be skipped. All reachable area border routers in

the NSSA should now be examined noting the one with the highest

router ID. If this router has the highest router ID, it will be the

one translating type-7 LSAs into type-5 LSAs for the NSSA, otherwise

the translation algorithm should not be performed.

New Member

Re: NSSA ABR not translatingType 7 LSAs to Type 5

yes..this makes sense and this is exactly the situation i have but for some reason conversion is not happening on the NSSA ABR...

Re: NSSA ABR not translatingType 7 LSAs to Type 5

on both NSSA ABRs, or only on one of them?

New Member

Re: NSSA ABR not translatingType 7 LSAs to Type 5

well only one ABR (with the highest RID) is designated with translating the LSAs and it's not doin in

Re: NSSA ABR not translatingType 7 LSAs to Type 5

could you show the configurations?

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