Preset attributes are similar to characteristics, in that their values
   control the way in which the routing module operates. However, unlike
   characteristics, you cannot alter preset attribute values using the set
   command.

     BROADCAST LSP TRANSMISSION INTERVAL
         Support: L1,L2

         Interval, in milliseconds, between the transmission of Link State
         Packets LSPs on a broadcast circuit.

     COMPLETE SNP INTERVAL
         Support: L1,L2

         Interval, in seconds, between generation of Complete Sequence Number
         Packets SNPs by a designated router on a broadcast circuit.

     DEFAULT ESHELLO TIMER
         Support: All

         Value to be used for the current suggested Hello timer, in the absence
         of any suggested value from the intermediate system IS. On routers,
         this is the value to be suggested when the router is not required to
         poll the ES configuration.  In routers, this value is suggested by the
         Suggested ES Configuration Timer option in IS Hellos.

     DR ISISHELLO TIMER
         Support: L1,L2

         Interval, in seconds, between the generation of IS-IS Hello PDUs by
         the designated router.

     ES CACHE HOLDING TIME
         Support: End

         Holding time, in seconds, for an entry in the node's end-node cache
         database.

     ES CACHE WIDTH
         Support: End

         Maximum number of LAN address entries in the node's end-node cache
         database on a broadcast circuit.

     HOLDING MULTIPLIER
         Support: All

         Value by which to multiply the Hello timer to obtain the holding timer
         value for ES and IS Hellos and for point-to-point, router-to-router
         Hellos.

     INACTIVE SELECTOR
         Support: All

         This is the selector value identifying the port to which incoming
         Inactive Subset PDUs are to be sent.

     INITIALIZATION TIMER
         Support: All

         Delay, in seconds, between initialization of a data link and sending a
         DECnet-Plus message on a DDCMP circuit.

     ISIS FORMAT
         Support: L1,L2

         This attribute controls the protocol identification to be used for
         "DNA Private" PDUs.  On broadcast circuits, this characteristic also
         controls the SAP on which they are transmitted.

     ISIS HOLDING MULTIPLIER
         Support: L1,L2

         Value by which to multiply the ISIS Hello timer to obtain the value of
         the holding timer for LAN level 1 and level 2 router-to-router Hellos.

     MAXIMUM AGE
         Support: L1,L2

         Number of seconds before an LSP is considered to be expired.

     MAXIMUM LSP GENERATION INTERVAL
         Support: L1,L2

         Maximum interval, in seconds, between link state packets LSPs
         generated by this node.

     MINIMUM LSP GENERATION INTERVAL
         Support: L1,L2

         Minimum time, in seconds, between generation of  LSPs by this node.

     MINIMUM LSP TRANSMISSION INTERVAL
         Support: L1,L2

         Minimum interval, in seconds, between retransmissions of an LSP.

     MULTICIRCUIT ESHELLO TIMER
         Support: End

         Value to be used for the current suggested Hello timer on a
         multicircuit end node with more than one circuit enabled, in the
         absence of any suggested values from the IS.

     ORIGINATING l1 LSP BUFFER SIZE
         Support: L1,L2

         Maximum size of level 1 LSPs and SNPs originated at this node.

     ORIGINATING l2 LSP BUFFER SIZE
         Support: L2

         Maximum size of level 2 LSPs and SNPs originated at this node.

     PARTIAL SNP INTERVAL
         Support: L1,L2

         Minimum interval, in seconds, between sending partial SNPs.

     POLL ESHELLO RATE
         Support: All

         Interval, in seconds, between ES Hellos when a router requires to poll
         the ES configuration.

     QUEUE THRESHOLD
         Support: L1,L2

         Average queue length at a router, above which the "congestion
         experienced" bit will be set in a forwarded data PDU.

     WAITING TIME
         Support: L1,L2

         Delay, in seconds, between routing databases being in the waiting
         state and entering the on state.

     ZERO AGE LIFETIME
         Support: L1,L2

         Time, in seconds, for which the purge header of an expired LSP is
         retained.