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Re: [PWE3] Proposed new 5.4.3 for arch draft


Thomas D. Nadeau wrote:
Stewart, you are aware that IP
employs ECMP as well, yes? 
Of course.


Seems more
generic to just mention ECMP instead of
MPLS, or mention MPLS as an example.

But this is an MPLS specific problem we are addressing.

ECMP in an IP network works just fine (provided you
ECMP per flow and not per packet).

BTW ECMP is just one example case of when you need to
discriminate between an IP packet and a non-IP packet
MPLS payload. IPFIX is another case.

- Stewart




	--Tom



-----Original Message-----
From: pwe3-admin@ietf.org [mailto:pwe3-admin@ietf.org] On Behalf Of
Stewart Bryant
Sent: Tuesday, March 02, 2004 7:47 PM
To: pwe3@ietf.org
Subject: [PWE3] Proposed new 5.4.3 for arch draft


Here is the proposed change to 5.4.3 that was discussed
at the WG meeting. Also here is the corresponding change
to section 9.

The arch draft will become informational, and
I will post a pre-draft of the full document with all
the 07 changes incorporated some time next week.

Please consider this the start of a two week last
call on this change.

I will put together a draft for the CW text in the
next few days.

- Stewart
---------------------------------------------------


5.4.3. PW Packets Aliasing IP Packets

To allow accurate packet inspection in an MPLS PSN, and/or to operate
correctly over MPLS PSNs that have deployed equal-cost multiple-path
load-balancing (ECMP), a PW packet must not alias an IP packet. IP
packets are carried in MPLS label stacks without any protocol
identifier. he method of packet discrimination must therefore be based
on some unique characteristic of the IP packet header, which PWE3 must
not mimic.T

This is the subject of work in progress.

-----------------------------------------------------


9.  IANA considerations

    IANA considerations will be identified in the PWE3 documents that
    define the PWE3 encapsulation, control and management protocols.





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