Dell PowerConnect B-RX BigIron RX Series Configuration Guide v02.7.02 - Page 270

7 Configuring forwarding parameters Figure 11 shows an example of two static routes configured for the same destination network. One of the routes is a standard static route and has a metric of 1. The other static route is a null route and has a higher metric than the standard static route. The device always prefers the static route with the lower metric. In this example, the device always uses the standard static route for traffic to destination network 192.168.7.0/24, unless that route becomes unavailable, in which case the device sends traffic to the null route instead. FIGURE 11 Standard and null static routes to the same destination network 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 Router A 192.168.6.188/24 Router B 192.168.6.157/24 192.168.7.7/24 When standard static route is good, Router A uses that route. 192.168.7.69/24 Router A 192.168.6.188/24 192.168.6.157/24 If standard static route is unavailable, Router A uses the null route (in effect dropping instead of forwarding the packets). Router B 192.168.7.7/24 X 192.168.7.69/24 Null 198 BigIron RX Series Configuration Guide 53-1001810-01