The MPLS WG Archive

[Loa Andersson <loa@pi.se>]

MPLSers,

included are two major items that the authors, wg-chairs and ADs
want specific comments on when the LSR mib module is published and
last called. The MIB will be sent to the Internet Drafts today (Friaday)
but will take a few days before it is announced. The last call will be
started by a specific mail, as soon as we see it publiched, and will be
limitied to changes since the last version. The discussion on the items
below could take place as a part of the wg last call.


The items are:

1) The indexing of the in/out/XC
    tables has changed from Unsigned32s
    to Octet Strings of up to 24 bytes
    in length.

    The reason this was done was to facilitate
    LSRs that support multiple applications of
    MPLS in a distribute fashion. Use of a
    flat 32 bit indexing space on these platforms
    ends up with VERY slot N^2+ GetNext searches
    due to the fact that labels are distributed
    among different applications. The GetNext
    routine must then query each application's
    "bag" of labels to determine the next index.
		
    This change is compatible with implementations
    that wish to remain with the 4 byte indexing;
    they just use a 4 byte octet string, while others
    are free to use the more specific indexing.

2) The addition of a RowPointer to the in/out/label
    stack tables to support "long" or GMPLS-style
    labels. The RowPointer is normally set to zeroDotZero
    except when the MIB needs to refer to an external
    table that defines labels that exceed the 32bits
    of space alloted in the tables today.  This
    in essence, future-proofs the MIB and makes
    it compatible immediately with the GMPLS MIBs
    defined in CCAMP.




-- 
/Loa

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email: loa@pi.se