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SNMP MIB Objects
E-11
3160-A2-GB21-80
March 1999
IP Group – “ipRouteTable” Object (ip 21)
The routing table used by the DSU/CSU is supported as a read/write table.
Entries in this table may be added, deleted, or changed. You should exercise
great caution when adding or modifying routes in the ipRoutingTable. In general,
it should not be necessary to add or modify routes in the DSU/CSU. In those
cases where it is deemed necessary, the routes should only be added to the
connected device (i.e., the device closest to the destination). Internal routing
mechanisms will propagate the route to the other devices.
An existing route may be effectively deleted by setting the ipRouteType object to
“invalid” for the entry to be deleted. An existing route may be modified by
changing fields in the desired entry (indexed by ipRouteDest) of the routing table.
A new route may be added by specifying values for a table entry for which the
index (“ipRouteDest”) does not already exist.
To add a route using an SNMP set, you must specify a group of minimal objects.
These variable bindings must be contained in a single Protocol Data Unit (PDU).
The objects are described in more detail in the following sections. The minimal
set consists of:
H ipRouteDest
H ipRouteIfIndex
The following objects are defaulted if not specified in the set PDU used to add a
route.
H ipRouteMetric1 – Defaulted to 1 hop.
H ipRouteMetric2 – Defaulted to current slot for carrier devices and –1 for
standalone devices.
H ipRouteType – Defaulted to indirect.
H ipRouteMask – Defaulted as specified in the MIB description.
The following objects are unused in the DSU/CSU and setting them will have no
effect on the operation of the IP implementation.
H ipRouteMetric3, ipRouteMetric4, ipRouteMetric5 – Defaulted to –1 as
specified in the MIB.
H ipRouteNextHop – Defaulted to 0.0.0.0.
The following read-only objects must not be specified in the set PDU used to add
a route.
H ipRouteProto – Set to netmgmt(3) by software.
H ipRouteAge – Defaulted to 999.
H ipRouteInfo – Set to OBJECT IDENTIFIER {0, 0} since it is unused.