Subject: [nvo3] destination UDP port : draft-ietf-nvo3-vxlan-gpe-00

From: "Sandeep Kumar (Sandeep) Relan" <[email-masked]>
Date: Mon, 21 Sep 2015 23:24:42 +0000

Hello,

Concern/Query :  What is the need to have another Destination UDP port number ?

Reference           :  draft-ietf-nvo3-vxlan-gpe-00 (VXLAN - GPE)

This draft mentions that :
IANA has assigned the value 4790 for the VXLAN-GPE UDP port.

Further, this draft specifies:

P Bit:  Flag bit 5 is defined as the Next Protocol bit.  The P bit

      MUST be set to 1 to indicate the presence of the 8 bit next

      protocol field. When P=1, the destination UDP port MUST be 4790.

      P = 0 indicates that the payload MUST conform to VXLAN as defined

      in [RFC7348<https://tools.ietf.org/html/rfc7348>], including destination UDP port - 4789

What is the need for having another IANA  assigned UDP destination port number ?

I don't see any strong reasons on the need of another IANA assigned UDP destination port number ?
I believe,  the  P Bit can take care of distinguishing between RFC 7348 VXLAN packet from VXLAN-GPE packets.

Appreciate, any insight/ background on the requirement to define another new UDP destination port number for future VXLAN packets ?

Thanks & regards
Sandeep Relan