Paradyne 317x E1 manual IP Group ± ªipRouteTableº Object ip

ACCULINK 317x E1 DSU/CSU

IP Group ± ªipRouteTableº Object (ip 21)

The routing table used by the E1 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 E1 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 ªinvalidº 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 (ªipRouteDestº) 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:

•ipRouteDest

•ipRouteIfIndex

The following objects are defaulted if not specified in the set PDU used to add a route.

•ipRouteMetric1 ± Defaulted to 1 hop.

•ipRouteMetric2 ± Defaulted to ±1 for standalone devices.

•ipRouteType ± Defaulted to indirect.

•ipRouteMask ± Defaulted as specified in the MIB description.

The following objects are unused in the E1 DSU/CSU and setting them will have no effect on the operation of the IP implementation.

•ipRouteMetric3, ipRouteMetric4, ipRouteMetric5 ± Defaulted to ±1 as specified in the MIB.

•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.

•ipRouteProto ± Set to netmgmt(3) by software.

•ipRouteAge ± Defaulted to 999.

•ipRouteInfo ± Set to OBJECT IDENTIFIER {0, 0} since it is unused.

IP Group ± ªipRouteDestº 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 is treated as described in RFC 1354 (IP Forwarding Table MIB):

ªThe 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.º

IP Group ± ªipRouteIfIndexº 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.

IP Group ± ªipRouteMetric2º Object (ipRouteEntry 4)

For standalone devices, ipRouteMetric2 is not used and contains ±1.

When adding a route to the routing table using SNMP, do not specify a value for ipRouteMetric2.

E-6 December 1996 3170-A2-GB20-20