[mpls] Question on draft-lm-mpls-sfc-path-verification

[Loa Andersson <[e-mail]>]

Yao,

This is a follow up from your presentation at the MPLS interim meeting 
September 16, 2020.

Thank you for the draft, I think the the problem you are addressing 
might turn out to be real.

A few early comments though.

You are defining new a new LSP Ping TLV and two  sub-TLVs for this TLV, 
but there are no IANA section in the document. An IANA section would 
probably have made it easier to parse the document.

However mostly my question was because I missed the early slides, 
including the SFC Validation TLV.

So let us see if I got it right after reading the document and go over 
the slides again.

You define a new LSP Ping TLV - the SFC Validation TLV.

You also define two sub-TLVs - the SFC Info Sub-TLV and the SFC Basic 
Unit FEC Sub-TLV.

The SFC Validation TLV may be included in a MPLS echo request or an MPLS 
echo reply.

The SFC Basic Unit FEC Sub-TLV maybe included in a SFC Validation TLV 
carried both in a MPLS echo request and a MPLS echo reply.

The SFC Info Sub-TL mayb be included in a SFC Validation TLV only if the 
TLV is carried in a MPLS echo replay.

Correct?

You need to define which range the TLV and sub-TLVs should be allocated 
from.

/Loa
-- 

Loa Andersson                        email: [e-mail]
Senior MPLS Expert                          [e-mail]
Bronze Dragon Consulting             phone: [phone]