Subject: draft-kumar-sfc-nsh-udp-transport & draft-ietf-rtgwg-dt-encap

From: Xuxiaohu <[email-masked]>
Date: Wed, 22 Jul 2015 08:37:57 +0000

Hi all,

First of all, I like the idea of directly encapsulating NSH over UDP since it eliminates the unnecessary VXLAN header encapsulation burden. However, there are still many headaches surrounding any UDP-based encapsulation proposal such as congestion controll, IPv6/UDP checksum, MTU and fragmentation, UDP dest port resource utilization. 

Since UDP has been selected as a tunnelling technology by more and more encapsulation proposals besides NSH-in-UDP, including but not limited to VXLAN, VXLAN-GPE, MPLS-in-UDP, IP-in-UDP,  TRILL-in-UDP, draft-ietf-rtgwg-dt-encap would be more useful in practice if it could give us concrete recommendations regarding the above headaches surrounding the UDP tunnelling usage, IMHO.

Best regards,
Xiaohu