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

My concern is that we would be introducing a new feature which won't work with some existing feature!. Could be a pain for operators who already use forwarding address for some optimization and want to use network hiding for security.

Rgds
Shraddha
-----Original Message-----
From: Acee Lindem [mailto:acee.lindem@ericsson.com] 
Sent: Thursday, February 09, 2012 8:43 PM
To: Shraddha Hegde
Cc: OSPF List
Subject: Re: [OSPF] OSPF WG Last Call for "Hiding Transit-only Networks in OSPF " - <draft-ietf-ospf-prefix-hiding-02.txt>

Hi Shraddha, 

You raise a very good point. 

On Feb 9, 2012, at 4:33 AM, Shraddha Hegde wrote:

> 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.

I think there should just be a general statement that a forwarding address MUST not be advertised when prefix-hiding is configured on the next-hop interface. However, we'll see what the authors have to say. 

Thanks,
Acee

> 
> 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
>> 
>> 
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