Routing Table - 3Com LANPLEX 2500 EXTENDEDPLEX®2500 EXTENDED User Manual

158.101.1.1
Figure 4-4 Router Interfaces in the LANplex System

Routing Table

A routing table allows a router or host to determine how to send a
packet toward the packet's ultimate destination. The routing table
contains an entry for every destination network, subnet, or host to
which the router or host is capable of forwarding packets. A router or
host uses the routing table when the destination IP address of the
packet it is sending is not on a network or subnet to which it is directly
connected. The routing table provides the IP address of a router that
can forward the packet toward its destination.
The routing table consists of the following elements:
Destination IP Address — the destination network, subnet, or host
Subnet Mask — the subnet mask corresponding to the destination IP
address
Metric — a measure of the "distance" to the destination. In the Routing
Information Protocol (RIP), the metric is the number of hops.
Gateway — the IP address of the next hop router (the IP address of the
interface through which the packet travels)
Interface — the interface number through which a packet must travel
to reach that router
Figure 4-5 shows the routing table of the router in Figure 4-4.
Network 1
Interfaces
158.101.1.2
1
Router
Interface 1
IP Address
Interface
Elements of IP Routing
Network 2
158.101.2.1
158.101.2.2
2
3
158.101.3.1
158.101.3.2
Network 3
4-5