RFC 2024 (rfc2024) - Page 3 of 90

Definitions of Managed Objects for Data Link Switching using SMIv2

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RFC 2024                  DLSw MIB using SMIv2              October 1996


    See the object dlswCircuitS1Index.

o   ifIndex is the primary index into dlswSdlcLsTable, which lists the
    SDLC stations DLSw is serving.

2.2  Relation to Underlying DLC Layer

   The DLSw MIB does not duplicate the information in the MIBs for the
   DLC layer underneath it.  Instead, each circuit table entry contains
   a pointer to a conceptual row in an underlying enterprise-specific or
   standard DLC MIB.

   Using the 802.2 LLC management as an example, the following rules
   should be considered when developing new DLSw related DLC MIBs, and
   when implementing the interactions between DLSw MIB and DLC MIBs:

o   The referenced row should represent the local LLC-2 (and/or LLC-1,
    if supported) link station that DLSw is using.  In the current 802.2
    LLC MIB draft, this might be a row of one of the tables
    llcCcAdminTable, llcCcOperTable, or llcCcStatsTable.

    A circuit using local LLC services will therefore have
    dlswCircuitS1DlcType = llc, and dlswCircuitS1Dlc = pointer to an LLC
    MIB table row.

o   Because DLSw is the user of LLC services, it is generally preferable
    to initiate administrative actions using the DLSw MIB and allow DLSw
    to control LLC directly, rather than starting with LLC MIB
    administrative actions.  For example, a hung circuit should be
    disconnected by setting dlswCircuitState, as opposed to setting
    llcCcAdminStatus to disable the LLC part of the circuit.  Similarly,
    setting bits in dlswIfSapList will cause row creation in
    llcSapOperTable as well as set the necessary DLSw-LLC relationship.

2.3  Relation to SDLC MIB (RFC 1747)

   The general comments stated in 2.2, "Relation to Underlying DLC
   Layer" apply to the SDLC MIB.  The following apply if the DLSw MIB is
   implemented in a product that also implements RFC 1747 [9]:

o   The row referenced from dlswCircuitS1Dlc should represent the local
    SDLC link station that DLSw is using.  This might be a row of one of
    the tables sdlcLSAdminTable, sdlcLSOperTable, or sdlcLSStatsTable.

    A circuit using local SDLC services will therefore have
    dlswCircuitS1DlcType = sdlc, and dlswCircuitS1Dlc = OID of one of
    these table rows.




Chen, et. al.               Standards Track
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