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Re: [PWE3] Proposed new 5.4.3 for arch draft
Stewart,
see a question below.
Mustapha.
--------------
Stewart Bryant wrote:
>
> 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. The method of packet discrimination must therefore
> be based on some unique characteristic of the IP packet header,
> which PWE3 must not mimic.
>
> This is the subject of work in progress.
MA> I am not clear about the impact of the above paragraph on the
rest of Section 5.4.3 and on Section 5.4.4. I understand that option
3 in your presentation Monday proposes a separate "PWE3 control word
registry" which will not allow values of 4 and 6. If so, why it that
not sufficient?
Why add that "the method of discrimination should be based on some
unique characteristic of the IP packet header"?
> -----------------------------------------------------
>
> 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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