User`s guide

Configuring IP Routing
Managing the routing table
2-16 Preliminary January 30, 1998 Pipeline User’s Guide
Static and dynamic routes
A static route is a path from one network to another, which specifies the
destination network and the router to use to get to that network. For routes that
must be reliable, the administrator often configures more than one path (adds a
secondary route), in which case the Pipeline chooses the primary route on the
basis of an assigned metric.
A dynamic route is a path to another network that is “learned” dynamically rather
than configured in a profile. A router that uses RIP broadcasts its entire routing
table every 30 seconds, updating other routers about which routes are usable.
Hosts that run ICMP can also send ICMP Redirects to offer a better path to a
destination network.
Note:
A dynamic route can overwrite or “hide” a static route to the same
network if the dynamic route’s metric is lower than that of the static route.
However, dynamic routes age and if no updates are received, they eventually
expire. In that case, the “hidden” static route reasserts itself and is reinstated in
the routing table.
Configuring static routes
Every Connection profile that specifies an explicit IP address is a static route.
(For details on configuring connections, see “Configuring IP routing
connections” on page 2-30.)
The network diagram in Figure 2-4 shows a static route to a subnet specified in
the LAN Adrs parameter (10.9.8.10/22) of a Connection profile. With this LAN
Adrs parameter setting, the implied static route is defined with the following
addresses:
• Dest=10.9.8.10/22