Subject: Re: [sfc] draft-ietf-sfc-nsf-01: It makes more sense to state "MD-type = 0x2" (zero or more Variable) as "MUST" and MD-type=0x1" as " SHOULD"

From: "Zhouqian (Cathy)" <[email-masked]>
Date: Fri, 20 Nov 2015 01:19:40 +0000

I support Linda's opinion.

Cathy

From: Linda Dunbar 
Sent: Wednesday, November 18, 2015 5:42 PM
To: [email-masked]'; 'Paul Quinn (paulq)'; 'Elzur, Uri'
Subject: draft-ietf-sfc-nsf-01: It makes more sense to state "MD-type = 0x2" (zero or more Variable) as "MUST" and MD-type=0x1" as " SHOULD" 

Paul and Uri, 

The Section 3.2 of  draft-ietf-sfc-nsf-01 says:

As both MD-type 1 and MD-type 2 are specified by the draft, a more reasonable approach is having the minimum common part (i.e. the first 8 bytes) as the MUST. As the MD-TYPE 2 allows minimum 0 context header (or 16 bytes context header), the MD-TYPE 2 should be a MUST support. And MD-TYPE 1 is a "SHOULD" support. 

Let's face it, the majority of SFC deployment probably won't need the all 16 bytes "context header" (which has higher chance of packet fragmentation). 

Linda