Brocade Communications Systems ICX 7250 series, Configuration Manual

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The following example removes the name of the designated static route, removes the route, and saves the change to the IP routing table.
device# configure terminal
device(config)# no ip route 10.22.22.22 255.255.255.255 10.1.1.1 name xyz
device(config)# no ip route 10.22.22.22 255.255.255.255 10.1.1.1
device(config)# write memory
Static route recursive lookup
This feature enables the Brocade device to use static routes to resolve another static route. The recursive static route next hop lookup
level can be configured. By default, this feature is disabled.
To configure static route next hop recursive lookup by other static routes, use the following command.
device(config)# ip route next-hop-recursion 5
Syntax: [no] ip route next-hop-recursion level
The level available specifies the numbers of level of recursion allowed. Acceptable values are 1-10. The default value is 3.
NOTE
This command can be independently applied on a per-VRF basis.
Static route resolve by default route
This feature enables the Brocade device to use the default route (0.0.0.0/0) to resolve a static route. By default, this feature is disabled.
Use the following command to configure static route resolve by default route.
device(config)# ip route next-hop-enable-default
Syntax: [no] ip route next-hop-enable-default
NOTE
This command can be independently applied on a per-VRF basis.
This command works independently with the ip route next-hop-recursion and ip route next-hop commands. If the default route is a
protocol route, that protocol needs to be enabled to resolve static routes using the ip route next-hop command in order for static routes
to resolve by this default route. If the default route itself is a static route, you must configure the ip route next-hop-recursion command
to resolve other static routes by this default route.
Configuring a "Null" route
You can configure the Layer 3 switch to drop IP packets to a specific network or host address by configuring a "null" (sometimes called
"null0") static route for the address. When the Layer 3 switch receives a packet destined for the address, the Layer 3 switch drops the
packet instead of forwarding it.
To configure a null static route, use the following CLI method.
To configure a null static route to drop packets destined for network 10.157.22.x, enter the following commands.
device(config)# ip route 10.157.22.0 255.255.255.0 null0
device(config)# write memory
Syntax: ip route ip-addr ip-mask null0 [ metric ] [ distance num ]
or
Static routes configuration
Brocade FastIron Layer 3 Routing Configuration Guide
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