Brocade FastIron Ethernet Switch Layer 3 Routing Configuration Guide - Manual (Page 72)

FIGURE 6 Standard and interface routes to the same destination network
To configure a standard static IP route and a null route to the same network, enter commands such as
the following.
device(config)# ip route 192.168.7.0/24 192.168.6.157/24 1
device(config)# ip route 192.168.7.0/24 null0 3
The first command configures a standard static route, which includes specification of the next-hop
gateway. The command also gives the standard static route a metric of 1, which causes the Layer 3
switch to always prefer this route when the route is available.
The second command configures another static route for the same destination network, but the
second route is a null route. The metric for the null route is 3, which is higher than the metric for the
standard static route. If the standard static route is unavailable, the software uses the null route.
To configure a standard static route and an interface-based route to the same destination, enter
commands such as the following.
device(config)# ip route 192.168.6.0/24 ethernet 1/1 1
device(config)# ip route 192.168.6.0/24 192.168.8.11/24 3
The first command configured an interface-based static route through Ethernet port 1/1. The command
assigns a metric of 1 to this route, causing the Layer 3 switch to always prefer this route when it is
available. If the route becomes unavailable, the Layer 3 switch uses an alternate route through the
next-hop gateway 192.168.8.11/24.
Configuring a default network route
The Layer 3 switch enables you to specify a candidate default route without the need to specify the
next hop gateway. If the IP route table does not contain an explicit default route (for example,
0.0.0.0/0) or propagate an explicit default route through routing protocols, the software can use the
default network route as a default route instead.
Configuring a default network route
72 FastIron Ethernet Switch Layer 3 Routing Configuration Guide
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