RFC 2115 (rfc2115) - Page 3 of 32

Management Information Base for Frame Relay DTEs Using SMIv2

RFC 2115                  Frame Relay DTE MIB             September 1997


   Should the user wish to group DLCs together to associate them with a
   higher layer, or to associate a DLC with an unnumbered point-to-point
   service, the frame relay DTE MIB provides an entry in the
   frCircuitEntry record. For example, suppose one were to configure a
   company proprietary protocol to run above several of the frame relay
   VCs. The basic layering would look something like the following:

      IP (ipaddrEntry 1 )  IP (ipaddrEntry 2)  IP (ipaddrEntry 3)
         |                    |                     |
         |                    |                     |
         |                    |              proprietary protocol
         |                    |              layer   (ifIndex 3)
         |                    |                     |
         |                    |                     |
      DLCI 20            DLCI 30            DLCI 40/41/42
      (ifIndex 2)        (ifIndex 2)         (ifIndex 2,
                                              logical ifIndex 3)
         |                    |                     |
         |                    |                     |
         |____________________|_____________________|
                              |
                              |
                      FR  DLMCI (ifIndex.2)
                              |
                              |
                   Physical Interface (ifIndex.1)



A configuration which specified that DLCI 40, 41,and 42 were associated
with a proprietary protocol layer, while DLCI 20 and 30 were to run IP
directly can now be expressed using a combination of frCircuitIfIndex
and frCircuitLogicalIfIndex.  In this particular case DLCIs 40, 41 and
42 would use frCircuitIfIndex equal to the frame relay interface level
(2) while their frCircuitLogicalIfIndex would indicate the proprietary
protocol (3). DLCIs 20 and 30 would have both instances set to the frame
relay interface (2).

      Object           Meaning for Frame Relay Interface
      ______           _____________________________________

      ifDescr          As per DESCRIPTION in RFC 1573.
      ifType           The value allocated for Frame Relay
                       Interfaces - frameRelay (32).

      ifMtu            Set to maximum frame size in octets for
                       this frame relay interface.




Brown & Baker               Standards Track