The MPLS WG Archive

[Alex Zinin <azinin@cisco.com>]

James,

 I'm talking mostly about the second part.

 The question such a document (BCP or whatever status) could
 address is "how does one send IP over a SONET DCC channel?".
 The answer could be as simple as "by using RFC1662 encapsulation
 and treating D{1-3}/D{4-12} OH bytes as a synchronous stream
 of octets", i.e., not by using LAP-D, or LAP-B, or SLIP, and
 not trying to align HDLC frames within the sequence of SONET
 frames.
 
-- 
Alex Zinin


Monday, December 18, 2000, 6:59 AM, James Carlson <james.d.carlson@east.sun.com> wrote:

> Alex Zinin writes:
>>  A number of companies working in the SONET area already use or are
>>  planning to use DCC for IP control plane [I put MPLS list back ;),
>>  since this question is related to GMPLS and OTN-related work].
>> 
>>  There are two types of IP encapsulation on DCC that I know of:
>>  LAP-D and PPP/HDLC. We use the second one in our SONET products.
>> 
>>  I think writing up an IETF document describing this would make sense.

> Describing which part?  I think there are at least three separate
> issues here.  One is the control plane issue (specifying the use of IP
> over DCC for carrying control messages), another is the encapsulation
> (for which RFCs 1332, 1661, and 1662 should do fine), and a third is
> having ITU-T specify that PPP is a "legal" option for DCC.

> For the first two issues, I think those are already handled.  It's
> just that third one that might be an issue for some users, and I don't
> think that can be done within an IETF working group.

> If you're suggesting a BCP saying that IP/PPP/HDLC/DCC is a good
> thing, I suppose that's possible, but I don't see what it
> accomplishes.