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SNMP MIB Objects
E-9
3162-A2-GB20-40
August 2000
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 –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.
IP Group – “ipRouteDest” Object (ipRouteEntry 1)
The ipRouteDest object serves as the index to the routing table. Since indexes for
tables must be unique, only one route per destination may appear in the table. To
ensure that no duplicate destinations appear in the routing table, the ipRouteDest
object of the ipRouteTable will be treated as described in RFC 1354 (IP
Forwarding Table MIB):
“The destination IP address of this route. An entry with a value of 0.0.0.0 is
considered a default route. This object may not take a Multicast (Class D)
address value. Any assignment (implicit or otherwise) of an instance of this object
to a value x must be rejected if the bitwise logical–AND of x with the value of the
corresponding instance of the ipForwardMask object is not equal to x.”
IP Group – “ipRouteIfIndex” Object (ipRouteEntry 1)
When the routing table is displayed, the ipRouteIfIndex object for some entries
may have a value greater than ifNumber. In these cases, the ipRouteIfIndex
refers to a proprietary interface which is not currently implemented by the
interface group of MIB II. Route entries with an unrecognized ipRouteIfIndex
value should not be deleted.
When setting this object via SNMP, the ipRouteIfIndex value can only assume an
appropriate value of ifIndex defined for the particular device type.