RFC 3813 (rfc3813) - Page 6 of 60

Multiprotocol Label Switching (MPLS) Label Switching Router (LSR) Management Information Base (MIB)

RFC 3813                      MPLS LSR MIB                     June 2004


   The operational status object indicates the packet forwarding state
   of a cross-connect entry.  For example, when the operational status
   objects is 'down' it indicates that the specified cross-connect entry
   will not forward packets.  Likewise, when it is set to 'up' it
   indicates that packets will be forwarded.

   The administrative status object indicates the forwarding state
   desired by the operator.

5.8.  mplsLabelStackTable

   The mplsLabelStackTable specifies the label stack to be pushed onto a
   packet, beneath the top label.  Entries to this table are referred to
   from mplsXCTable.

5.9   mplsInSegmentMapTable

   The mplsInSegmentMapTable specifies the mapping from the
   mplsInSegmentIndex to the corresponding mplsInSegmentInterface and
   mplsInSegmentLabel objects.  The purpose of this table is to provide
   the manager with an alternative means by which to locate in-segments.
   For instance, this table can be useful when tracing LSPs from LSR to
   LSR by first following the in-segment to out-segment, retrieving the
   outgoing label and out-going interface, and then proceeding to
   interrogate this table at the next-hop LSR to continue the trace.

6.  Use of 32-bit and 64-bit Counters

   64-bit counters are provided in this MIB module for high speed
   interfaces where the use of 32-bit counters might be impractical. The
   requirements on the use of 32-bit and 64-bit counters (copied
   verbatim from [RFC 2863]) are as follows.

   For interfaces that operate at 20,000,000 (20 million) bits per
   second or less, 32-bit byte and packet counters MUST be supported.
   For interfaces that operate faster than 20,000,000 bits/second, and
   slower than 650,000,000 bits/second, 32-bit packet counters MUST be
   supported and 64-bit octet counters MUST be supported.  For
   interfaces that operate at 650,000,000 bits/second or faster, 64-bit
   packet counters AND 64-bit octet counters MUST be supported.

7.  Example of LSP Setup

   In this section we provide a brief example of setting up an LSP using
   this MIB module's objects.  While this example is not meant to
   illustrate every nuance of the MIB module, it is intended as an aid
   to understanding some of the key concepts. It is meant to be read
   after going through the MIB module itself.



Srinivasan, et al.          Standards Track