RE: ABR of Not-So-Stubby Area

From: Pankaj Madhukar Kulkarni (PankajKu@hclcomnet.co.in)
Date: Thu Mar 10 2005 - 01:45:26 GMT-3


Al,
This is quite interesting...

How does an ABR know about the presence of the other ABR in the area?

Let's continue hunting...
Pankaj

-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
alsontra
Sent: Thursday, March 10, 2005 9:24 AM
To: 'Jonathan ZD'; 'CCIE - GS'
Subject: RE: ABR of Not-So-Stubby Area

Search the archives, I had to learn this the hard way....

And the answer is: If you have two ABR to an NSSA, the ABR with the
highest
router-id will translate N2---to--->E2. If for some reason the ABR with
highest RID is not connected to area 0, no conversion will take place.
Easies solution is to change RIDs.

To paraphrase:

NSSA RFC 1587 states that before an NSSA ABR converts Type-7 to Type-5,
all
NSSA ABR must examine all other NSSA ABR to determine the highest
router-id.
The NSSA ABR with the highest router-id "must" the conversion from N2 to
E2.
(Troubleshooting IP protocols, Cisco Press -Page 444)

Happy hunting
Al

-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Jonathan ZD
Sent: Wednesday, March 09, 2005 9:31 AM
To: CCIE - GS
Subject: ABR of Not-So-Stubby Area

I've followed the link (911networks.com) some one posted it under group
study
one time, I've come across many summary they posted and felt so unsure
about
it. There's one topic that I'd like to ask Group to confirm it.

Under the following link (about Not-So-Stubby Area):
http://911networks.com/node/234?PHPSESSID=38ceea92a6df4ad93d2fba9ecc6477
80

It said that "ONLY THE ROUTER WITH HIGHEST ROUTER-ID DOES THE CONVERSION
LSA
7
TO 5, MAKE SHURE THAT IT'S THE ABR".

Is this true?

Thanks,

Jonathan.



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