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15-16

IP Routing Features

Configuring Static IP Routes

Configuring a “Null” Route

You can configure the routing 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 routing switch receives a packet destined for the

address, the routing switch drops the packet instead of forwarding it.

To configure a null static route to drop packets destined for network

209.157.22.x, enter the following commands:

HPswitch(config)# ip route 209.157.22.0 255.255.255.0 reject

HPswitch(config)# write memory

Syntax: ip route <ip-addr> <ip-mask> reject

ip route <ip-addr>/<mask-bits> reject

The <ip-addr> parameter specifies the network or host address. The routing

switch will drop packets that contain this address in the destination field

instead of forwarding them.

The <ip-mask> parameter specifies the network mask. Ones are significant

bits and zeros allow any value. For example, the mask 255.255.255.0 matches

on all hosts within the Class C sub-net address specified by <ip-addr>. Alter-

natively, you can specify the number of bits in the network mask. For example,

you can enter 209.157.22.0/24 instead of 209.157.22.0 255.255.255.0.

The reject parameter indicates that this is a null route. You must specify this

parameter to make this a null route.

!Software.book Page 16 Thursday, October 10, 2002 6:10 PM

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