HP 6120XG HP ProCurve Series 6120 Blade Switches Multicast and Routing Guide - Page 67

Other Sources of Routes in the Routing Table, Static IP Route Parameters, null interface.

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IP Routing Features Configuring Static IP Routes Other Sources of Routes in the Routing Table The IP route table can also receive routes from these other sources: ■ Directly-connected networks: One route is created per IP interface. When you add an IP interface, the routing switch automatically creates a route for the network the interface is in. ■ RIP: If RIP is enabled, the routing switch can learn about routes from the advertisements other RIP routers send to the routing switch. If the RIP route has a lower administrative distance than any other routes from different sources to the same destination, the routing switch places the route in the IP route table. (Refer to "Administrative Distance" on page 3­ 7.) ■ Default route: This is a specific static route that the routing switch uses if other routes to the destination are not available. See "Configuring the Default Route" on page 3-24. Static IP Route Parameters When you configure a static IP route, you must specify the following parameters: ■ The IP address and network mask for the route's destination network or host. ■ The route's path, which can be one of the following: • the IP address of a next-hop router. • a "null" interface. The routing switch drops traffic forwarded to the null interface. The routing switch also applies default values for the route's administrative distance (page 3-7). In the case of static routes, this is the value the routing switch uses to compare a static route to routes from other route sources to the same destination before placing a route in the IP route table. The default administrative distance for static IP routes is 1, but can be configured to any value from 1 - 255. The fixed administrative distance values ensure that the routing switch always prefers static IP routes over routes from other sources to the same destination. 3-21

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IP Routing Features
Configuring Static IP Routes
Other Sources of Routes in the Routing Table
The IP route table can also receive routes from these other sources:
■
Directly-connected networks: One route is created per IP interface. When
you add an IP interface, the routing switch automatically creates a route
for the network the interface is in.
■
RIP: If RIP is enabled, the routing switch can learn about routes from the
advertisements other RIP routers send to the routing switch. If the RIP
route has a lower administrative distance than any other routes from
different sources to the same destination, the routing switch places the
route in the IP route table. (Refer to “Administrative Distance” on page 3-
7.)
■
Default route: This is a specific static route that the routing switch uses
if other routes to the destination are not available. See “Configuring the
Default Route” on page 3-24.
Static IP Route Parameters
When you configure a static IP route, you must specify the following
parameters:
■
The IP address and network mask for the route’s destination network or
host.
■
The route’s path, which can be one of the following:
•
the IP address of a next-hop router.
•
a “null” interface. The routing switch drops traffic forwarded to the
null interface.
The routing switch also applies default values for the route’s administrative
distance (page 3-7). In the case of static routes, this is the value the routing
switch uses to compare a static route to routes from other route sources to
the same destination before placing a route in the IP route table. The default
administrative distance for static IP routes is 1, but can be configured to any
value from 1 - 255.
The fixed administrative distance values ensure that the routing switch always
prefers static IP routes over routes from other sources to the same destination.
3-21