User Manual
IP IP Routing
6-17
An SCS in a small sales office might have a default route that points to the corporate headquarters. The SCS
doesn’t need to know about all of the routes on the headquarters network. It only knows to send all otherwise
unspecified traffic to the central location, where it will be routed to the final destination.
6.7.2.2 Adding Routes to the Table
Entries may be added to the routing table in three ways: locally, statically, or dynamically.
Locally When a route is added locally, it is automatically determined from the SCS IP
address and network mask. The SCS always keeps a local route to the Ethernet
that is attached to; this route is never deleted.
Statically Statically-entered routes are entered and removed by the administrator. These
routes are used when dynamic routes are unavailable.
To add a static route to the routing table, use the Set/Define IP Route
command. A destination and a path to that destination must be specified. The
destination may be an IP network, subnetwork, or host.
The path may be another router on the Ethernet or a site. To specify that the
route is another router, use the Nextrouter parameter. To specify that the route
is to a site, use the Site parameter. The Site parameter indicates that a particular
site should be started to forward the packet. The site will handle any remote
connections necessary to forward the packet (for example, dialing another
LAN).
A metric will be associated with the route to indicate its “cost.” The SCS will
use the route to determine the most efficient route; routes with a lower cost will
be chosen over routes with a higher cost. If a metric is not specified, the SCS
will assign a metric of 1 to the route.
Figure 6-40: Adding Static Routes
In Figure 6-40, the first command specifies that the route to network 192.5.4.0
is through another router, 192.0.1.1. The route was assigned a metric of 4.
The second command specifies that the route to network 192.5.3.0 is through
site dallas. As a metric is not specified, the SCS will assign this route a metric
of 1. When the SCS receives traffic destined for network 192.5.3.0, if this route
is determined to be the most efficient route, site dallas will be started and will
forward the packet.
To enter a static default route, use the Set/Define IP Route Default command.
Figure 6-41: Adding Default Routes
Local>> DEFINE IP ROUTE 192.5.4.0 NEXTROUTER 192.0.1.1 4
Local>> DEFINE IP ROUTE 192.5.3.0 SITE dallas
Local>> DEFINE IP ROUTE 192.0.1.0 DEFAULT SITE internet
Local>> DEFINE IP ROUTE 192.0.2.0 DEFAULT NEXTROUTER 192.0.1.1 2