Re: [mpls] Some question on draft-xu-mpls-in-udp-04

[Lucy yong <[e-mail]>]

Hi Vivek,

I share my opinion. Please see below.

From: [e-mail] [mailto:[e-mail]] On Behalf Of Vivek Kumar
Sent: Wednesday, December 05, 2012 5:19 AM
To: [e-mail]
Subject: [mpls] Some question on draft-xu-mpls-in-udp-04

Hi  Authors,

I have some question.


1)      The  draft-xu-mpls-in-udp-04 main purpose seems to be for proving load balancing in IP network for MPLS packets.  Is that the only use case of this new encapsulation method or there can be some more ?
[Lucy] This draft proposes mpls-in-udp format to enable better load balancing in IP network for MPLS payload. In fact, as section 4 states, the udp encapsulation can apply other applications beside MPLS, for example, IP. However, potential for other applications are outside scope of this draft. We plan to have another draft describe the udp encapsulation in general as mentioned in section 4.


2)      The draft says that ingress PE router will calculate entropy and  encapsulate UDP header with src port containing entropy value . Does this mean that only PE routers can do UDP encap since PE router can look deep inside the packet to calculate entropy ?
                What if LSR's want to initiate UDP tunnel ?
[Lucy] Yes, the solution requires PE to support UDP and proposes to reserve two UDP port number to indicate the payload type. PE understands the payload and can get some flow entropy from the payload and insert into UDP src port. Could you elaborate what is the UDP tunnel?

Lucy

Kindly provide your comments .

Regards,
Vivek