Foundry Networks Switch and Router User Manual

Configuring IP
December 2000 15 - 47
Figure 15.3 Standard and null static routes to the same destination network
Figure 15.4 shows another example of two static routes. In this example, a standard static route and an interface-
based static route are configured for destination network 192.168.6.0/24. The interface-based static route has a
lower metric than the standard static route. As a result, the Layer 3 Switch always prefers the interface-based
route when the route is available. However, if the interface-based route becomes unavailable, the Layer 3 Switch
still forwards the traffic toward the destination using an alternate route through gateway 192.168.8.11/24.
Router A
Router B
192.168.7.69/24
X
192.168.6.157/24
192.168.7.7/24
192.168.6.188/24
Router A
Router B
192.168.7.69/24
192.168.6.157/24
192.168.7.7/24
192.168.6.188/24
Two static routes to 192.168.7.0/24:
--Standard static route through
gateway 192.168.6.157, with metric 1
--Null route, with metric 2
When standard static route
is good, Router A uses that
route.
If standard static route is
unavailable, Router A uses
the null route (in effect dropping
instead of forwarding the packets).
Null

Foundry Networks Switch and Router Specifications

General

Brand	Foundry Networks
Model	Switch and Router
Category	Switch
Language	English