Subject: SRv6 SRH format

From: "Joel M. Halpern" <[email-masked]>
Date: Mon, 9 Jul 2018 14:16:31 -0400

In the SRH format in section 2, there is a tag field defined.  However, 
there is no use given for it, and no processing rules.  Which means that 
interoperability is unlikely unless we all jump to the same conclusions 
about how to use the field.

So let's use the usual practice in the IETF for such field.

Reserved: Must be zero on initial transmission, must be unchanged on 
relaying, must be ignored when processing.

If a later spec wants to define a meaning for the field, it can do so. 
That is the point of reserved fields.

Yours,
Joel