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Re: [lisp] [pim] WGLC draft-ietf-pim-join-attributes-for-lisp-03

Dino Farinacci <farinacci@gmail.com> Fri, 03 June 2016 00:36 UTC

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From: Dino Farinacci <farinacci@gmail.com>
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Date: Thu, 02 Jun 2016 20:35:42 -0400
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To: "Jesus Arango (jearango)" <jearango@cisco.com>
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Cc: "lisp@ietf.org" <lisp@ietf.org>, "pim@ietf.org" <pim@ietf.org>, "Stig Venaas (svenaas)" <stig@cisco.com>
Subject: Re: [lisp] [pim] WGLC draft-ietf-pim-join-attributes-for-lisp-03
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> To support mobile multicast sources, the root xTR must keep track of ALL receiver RLOCs even when the corresponding receiver XTRs have not requested unicast

It is better for clarity of the text. Now I will comment on the design. 

> replication.  If the root xTR detects that the root-EID has moved to a new root xTR, it sends an SMR message to all receiver xTRs,  

You don't need SMRs. You can use Map-Notify messages from the map-server. It converges better. 

See draft-ietf-lisp-signal-free-multicast for
details. The same machinery can be used. And it is simple. 

> prompting them to update their map cache.  

Receiver xTRs are receiving and decapsulating packets. They are ETRs. They don't have map-caches. So this doesn't make sense. 

> This is only possible if  LISP can obtain from PIM the set of all receiver RLOCS that have active Join state for the root-EID.

Well they could register to the mapping system. That is where all receiver xTRs can be tracked (and perhaps not used for forwarding like it is in draft-ietf-lisp-signal-free-multicast). 

So try again. 

Dino

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