RE: [PWE3] Proposed new 5.4.3 for arch draft

["Andrew G. Malis" <andymalis at comcast.net>]

Sasha,

Even if someone is silly enough to propose that (especially since there's a 
1/64K chance that the checksum will match in a random 20-byte bit 
pattern:-), I really don't thing the WG would be silly enough to include it 
in a WG document.  But if you explicitly block this bad idea, people will 
ask why you don't explicitly block other bad ideas as well (and then 
proceed to spend their time thinking up other bad ideas to block).

I'm happy with the text as is

Cheers,
Andy

---------

At 3/3/2004 03:52 AM +0200, Sasha Vainshtein wrote:
> Stewart and all,
> Basically fine, please see a couple of minor comments inline (marked
> [Sasha]).
>
> Regards,
>                  Sasha.
> ... snipped ...
>
> 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.
> [Sasha] IMO it should be MUST NOT or, probably, SHOULD NOT.
> 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.
> [Sasha] I honestly believe no one will ever propose verifying the cheksum
> [Sasha] of the first 20 bytes after the bottom label as "the unique
> [Sasha] characteristic of the IP packet header". But worse things have
> [Sasha] happened, so maybe we should explicitly block this.
> 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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