Patton electronic 3120 - Manual (Page 207)

Routing Information 207
Model 3120 RAS Administrators’ Reference Guide 16 • IP
The IP Routing Information window also has a link to the O/S forwarding table where the forwarding param-
eters are displayed (“O/S forwarding table window” on page 210).
Destination (ipRouteDest)
The destination IP address of this route. An entry with a value of 0.0.0.0 is considered a default route. Multiple
routes to a single destination can appear in the table, but access to such multiple entries is dependent on the
table-access mechanisms defined by the network management protocol in use.
To view or modify next-hop routing information for each destination, click on a destination link in the Desti-
nation column. For more information about modifying next-hop routing information settings, refer to “IP
Routing Destination window” on page 212.
Mask (ipRouteMask)
Indicates the mask to be logical-ANDed with the destination address before being compared to the value in the
ipRouteDest field. For those systems that do not support arbitrary subnet masks, an agent constructs the value
of the ipRouteMask by determining whether the value of the corresponding ipRouteDest field belongs to a
Class A, B, or C network, and then using the appropriate mask from table 3.
Gateway (RouteGateway)
Specifies the IP address to which the packets should be forwarded.
Cost (RouteCost)
This is the cost of the route as defined by RIP standards. Cost is sometimes considered to be number of hops.
A cost of 16 is considered to be infinite. A cost can be given to user-entered routes so their preference in rela-
tion to learned routes can be calculated.
Interface (ipRouteIfIndex)
The index value that identifies the local interface through which the next hop of this route should be reached.
The interface identified by a particular value of this index is the same interface as identified by the same value
of ifIndex.
State (RouteState)
• invalid(1)—This setting deletes the route.
• active(2)—A valid route is in use.
• nopath(3)—No route is available to the specified gateway. The gateway is not known to local networks.
• agedout(4)—Invalid route (soon to be removed).
• costly(5)—A valid route, but not in use because of it’s higher cost.
Table 3. Masks
Mask Network
255.0.0.0 class-A
255.255.0.0 class-B
255.255.255.0 class-C