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Re: [Bier] Comments on draft-hfa-bier-pim-tunneling

Eric C Rosen <erosen@juniper.net> Tue, 18 July 2017 21:21 UTC

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To: "Bidgoli, Hooman (Nokia - CA/Ottawa)" <hooman.bidgoli@nokia.com>, "Dolganow, Andrew (Nokia - SG/Singapore)" <andrew.dolganow@nokia.com>, Antoni Przygienda <prz@juniper.net>
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From: Eric C Rosen <erosen@juniper.net>
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Date: Tue, 18 Jul 2017 17:21:25 -0400
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Archived-At: <https://mailarchive.ietf.org/arch/msg/bier/2RAeezxsk_JsxWhS0bAkT4yJ_XM>
Subject: Re: [Bier] Comments on draft-hfa-bier-pim-tunneling
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On 7/18/2017 4:34 PM, Bidgoli, Hooman (Nokia - CA/Ottawa) wrote:
> We are not trying to create a PIM adjacency via BIER. It is more like 
> mLDP tunneling concept.

By "mLDP tunneling concept" are you referring to mLDP "in-band 
signaling" (RFC6826)?

If you are sending PIM Join/Prune messages from one router to another, 
then the routers are PIM adjacencies, and I don't see how you can avoid 
treating them as such.
This does raise a lot of issues -- what if the Join has Join attributes 
in it, how can you tell what Join attributes are supported unless you 
have Hellos, etc.  Also, by carrying PIM Join/Prune messages, you retain 
the issues that come from periodic retransmission of the Join/Prune 
messages.

mLDP in-band signaling doesn't carry PIM Join/Prune messages, it just 
carries the (S,G) information.  It does have some ASM issues because 
there is no "prune this source off the shared tree" operation.  Or to 
put it another way: mLDP in-band signaling does not tunnel PIM over 
mLDP, it splices several PIM trees together with a P2MP LSP.   If you 
want your scheme to function like mLDP in-band signaling, you need to 
say a lot more about how the BIER-PIM Join/Prune messages are 
constructed and how they are processed.

That would be a less general solution than using BIER  to emulate a 
link.  It would also need to be compared to other forms of overlay 
signaling such as MVPN-based GTM.

> love to have a face to face chat before the session. 

Unfortunately I am not in Prague.

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