Subject: Request to revise Figure 11

From: Stewart Bryant <[email-masked]>
Date: Mon, 28 Jul 2003 12:26:59 +0100

I am editing <draft-ietf-pwe3-arch-04.txt> at add the agreed
5.4.4 changes and to change MPLS PID to PWE3 PID, and notice
that we have the following:

+---------------------+
|      Payload        |
/=====================\          +--------------------------------+
H Payload Convergence H--+------>| Flags, Frag, Len, Seq #, etc   |
H---------------------H  |       +--------------------------------+
H       Timing        H--------->|              RTP               |
H---------------------H  |       +--------------------------------+
H     Sequencing      H--+       |    PWE3 Payload Type Ident     |
\=====================/  |       +--------------------------------+
|  PW Demultiplexer   |--------->|           PW Label             |
+---------------------+  |       +--------------------------------+
|  PSN Convergence    |--+  +--->| Outer Label or MPLS-in-IP encap|
+---------------------+     |    +--------------------------------+
|        PSN          |-----+
+---------------------+
|      Data-link      |
+---------------------+
|       Physical      |
+---------------------+

   Figure 11: PWE3 over an MPLS PSN using a control word

At the ITU SG13 TDM meeting that followed on from ITEF-57 we descided
to layer RTP over the CW and not as shown above. The CW for TDM
is now ECMP safe so the PWE3 PID is not needed. TDM is the only
service using RTP, and most of the key IETF TDM designers were at
the meeting and bought into the agreement.

I would therefore like to match the arch draft with the latest ITU
text and the expected new TDM drafts.

Figure 11 should therefore become:

+---------------------+
|      Payload        |
/=====================\
H Payload Convergence H--+
H---------------------H  |       +--------------------------------+
H       Timing        H--------->|              RTP               |
H---------------------H  |       +--------------------------------+
H     Sequencing      H--+------>| Flags, Frag, Len, Seq #, etc   |
\=====================/  |       +--------------------------------+
|  PW Demultiplexer   |----+     |    PWE3 Payload Type Ident     |
+---------------------+  | |     +--------------------------------+
|  PSN Convergence    |--+ +---->|           PW Label             |
+---------------------+          +--------------------------------+
|        PSN          |--------->| Outer Label or MPLS-in-IP encap|
+---------------------+          +--------------------------------+
|      Data-link      |
+---------------------+
|       Physical      |
+---------------------+

   Figure 11: PWE3 over an MPLS PSN using a control word

Any objections?

Stewart