Re: [bess] Question regarding RFC6625 and this draft-->//RE: I-D Action: draft-ietf-bess-mvpn-expl-track-13.txt

[Xiejingrong <[e-mail]>]

Hi Jeffrey,

The sender PE need to work on (*,*) tunnel for a while (switch-over timer) and then switch to the (S,G) tunnel.

To quote RFC6513 section 7.1.1
   The decision to bind a particular C-flow (designated as (C-S,C-G)) to
   a particular P-tunnel, or to switch a particular C-flow to a
   particular P-tunnel, is always made by the PE that is to transmit the
   C-flow onto the P-tunnel.

   When a C-flow is switched from one P-tunnel to another, the purpose
   of running a switch-over timer is to minimize packet loss without
   introducing packet duplication.

Jingrong

-----Original Message-----
From: Jeffrey (Zhaohui) Zhang [mailto:[e-mail]] 
Sent: Saturday, January 12, 2019 3:29 AM
To: Xiejingrong <[e-mail]>; [e-mail]
Cc: [e-mail]
Subject: RE: Question regarding RFC6625 and this draft-->//RE: [bess] I-D Action: draft-ietf-bess-mvpn-expl-track-13.txt

Jingrong,

> It is determined by the sender site PE whether to steer the flow of (C-S, C-G) into (*,*) PMSI-tunnel or (S,G)PMSI-tunnel, and the receiver site PE should work correctly in any case.

Why would the sender PE send into (*, *) when there is a match for (S,G)?

Jeffrey

> -----Original Message-----
> From: Xiejingrong [mailto:[e-mail]]
> Sent: Thursday, January 10, 2019 11:10 PM
> To: [e-mail]
> Cc: [e-mail]
> Subject: Question regarding RFC6625 and this draft-->//RE: [bess] I-D Action:
> draft-ietf-bess-mvpn-expl-track-13.txt
> 
> Hi,
> 
> I have a question regarding RFC6625 and this draft, since this draft 
> is based on the RFC6625.
> 
> In RFC6625 section "3.2.1 Finding the match for (C-S,C-G) for Data
> Reception":
> It defined the rules for Finding the matched S-PMSI A-D route for a 
> (C-S,C-G) state on a receiver site PE.
> It seems to me that, the receiver site PE will respond only to the 
> *ONE* 'Match for Reception' S-PMSI A-D route, and setup the 'reception 
> state' only for the 'Matched' S-PMSI A-D route.
> But it is not true for an inclusive-selective relation between S-PMSI 
> A-D (*,*) and S-PMSI A-D(S,G).
> Thinking the S-PMSI A-D (*,*) as an Inclusive one, the receiver site 
> PE with a
> (C-S,C-G) state should keep its join state on both the S-PMSI A-D 
> (*,*) and S- PMSI A-D(S,G), and setup the 'reception state' on both 
> the (*,*) PMSI-tunnel and (S,G) PMSI-tunnel.
> It is determined by the sender site PE whether to steer the flow of 
> (C-S, C-G) into (*,*) PMSI-tunnel or (S,G)PMSI-tunnel, and the 
> receiver site PE should work correctly in any case.
> 
> My question:
> Is the section 3.2.1 or RFC6625 wrong and should the 'Match for Reception'
> include *one or many* S-PMSI A-D routes ?
> Is it a problem that can affect this draft ?
> 
> Thanks
> Jingrong.
> 
> 
> -----Original Message-----
> From: BESS [mailto:[e-mail]] On Behalf Of internet- 
> [e-mail]
> Sent: Thursday, November 29, 2018 12:27 AM
> To: [e-mail]
> Cc: [e-mail]
> Subject: [bess] I-D Action: draft-ietf-bess-mvpn-expl-track-13.txt
> 
> 
> A New Internet-Draft is available from the on-line Internet-Drafts directories.
> This draft is a work item of the BGP Enabled ServiceS WG of the IETF.
> 
>         Title           : Explicit Tracking with Wild Card Routes in Multicast VPN
>         Authors         : Andrew Dolganow
>                           Jayant Kotalwar
>                           Eric C. Rosen
>                           Zhaohui Zhang
> 	Filename        : draft-ietf-bess-mvpn-expl-track-13.txt
> 	Pages           : 21
> 	Date            : 2018-11-28
> 
> Abstract:
>    The Multicast VPN (MVPN) specifications provide procedures to allow a
>    multicast ingress node to invoke "explicit tracking" for a multicast
>    flow or set of flows, thus learning the egress nodes for that flow or
>    set of flows.  However, the specifications are not completely clear
>    about how the explicit tracking procedures work in certain scenarios.
>    This document provides the necessary clarifications.  It also
>    specifies a new, optimized explicit tracking procedure.  This new
>    procedure allows an ingress node, by sending a single message, to
>    request explicit tracking of each of a set of flows, where the set of
>    flows is specified using a wildcard mechanism.  This document updates
>    RFCs 6514, 6625, 7524, 7582, and 7900.
> 
> 
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