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Re: [OSPF] OSPF WG Last Call for "Hiding Transit-only Networks in OSPF " - <draft-ietf-ospf-prefix-hiding-02.txt>

Shraddha Hegde <shraddha@juniper.net> Thu, 09 February 2012 09:37 UTC

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From: Shraddha Hegde <shraddha@juniper.net>
To: OSPF List <ospf@ietf.org>
Date: Thu, 09 Feb 2012 15:03:08 +0530
Thread-Topic: [OSPF] OSPF WG Last Call for "Hiding Transit-only Networks in OSPF " - <draft-ietf-ospf-prefix-hiding-02.txt>
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Subject: Re: [OSPF] OSPF WG Last Call for "Hiding Transit-only Networks in OSPF " - <draft-ietf-ospf-prefix-hiding-02.txt>
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In case of p2mp networks, type 3 links used to describe the interface address
is omitted to hide the network.

This can cause problems in the next hop calculation in certain cases and in my opinion it is better to avoid installing a certain route  (as done in case of broadcast networks in this draft) rather than completely omitting it.

Consider a scenario when p2mp interfaces are configured in the NSSA area.

A---------B
     | 
     ------C

A,B and C are connected over a p2mp network configured in NSSA area.
B & C are ASBRs importing external routes. B & C will have to include forwarding address corresponding to interface address when they advertise external LSA to A. 
We cannot hide the p2mp network in the above scenario as type 3 stub-links are completely omitted, we cannot resolve the forwarding address for the external LSAs originated by B & C.

Rgds
Shraddha

-----Original Message-----
From: ospf-bounces@ietf.org [mailto:ospf-bounces@ietf.org] On Behalf Of Acee Lindem
Sent: Wednesday, February 08, 2012 10:37 PM
Cc: OSPF List
Subject: [OSPF] OSPF WG Last Call for "Hiding Transit-only Networks in OSPF " - <draft-ietf-ospf-prefix-hiding-02.txt>

As I have heard no objections, I'm beginning the 2 week OSPF Working Group last call for draft-ietf-ospf-prefix-hiding-02.txt.
Please review the draft and post your last call comments prior to 12:00 AM PDT on February 23nd, 2012. 
Here is a URL for your convenience: 

http://www.ietf.org/id/draft-ietf-ospf-prefix-hiding-02.txt

Thanks,
Acee 

On Jan 26, 2012, at 11:19 AM, Acee Lindem wrote:

> As WG co-chair, I have reviewed this document and believe it is ready for OSPF WG last call. Any other opinions? 
> There is at least one implementation. Here is a URL for you convenience:
> 
>   http://www.ietf.org/id/draft-ietf-ospf-prefix-hiding-01.txt
> 
> There is an IPR disclosure on this draft:
> 
>   http://datatracker.ietf.org/ipr/1423/
> 
> I will start WG last call next week if I don't hear any objections.
> 
> Thanks,
> Acee
> 
> 
> _______________________________________________
> OSPF mailing list
> OSPF@ietf.org
> https://www.ietf.org/mailman/listinfo/ospf

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