Re: Re: Demultiplexing of VCCV packets in SAToP and CESoPS N
Skip Booth <ebooth <at> cisco.com>
2005-08-01 14:05:02 GMT
Sasha Vainshtein wrote:
> Skip and all,
> Stitching between MPLS and L2TP PWs is surely an important goal.
> However, I think that the existing situation makes it near impossible -
> and the TDM PWs are the least complicated part of it!
> When it come to Layer 2 PWs (FR, ATM, HDLC, Ethernet), the L2TP and
> MPLS sequencing schemes differ substantially:
> - L2TP uses a 24-bit no-gap sequence number space
> - MPLS uses a 16-bit, skipped-zero one.
Sure - but there's ways to perform the 16-24 bit conversion, albiet not that
pretty, you can still do it. In environments where sequencing is not required,
the interworking is pretty straightforward.
For TDM applications, since we are using the PWE3 MPLS CW for both L2TPv3 and
MPLS pseudowires, the interworking is very straightforward assuming we have a
consistent CW/RTP ordering.
> IMHO handling this difference at the stitching point would be much more
> complicated than handling the difference in the CW and RTP order for
> TDM PWs.
> Did I miss something?
Assuming we use the same CW (which I believe we are in agreement on), then the
interworking is very straightforward.