IP Routing Features

Configuring Static IP Routes

The following command configures a static route to 207.95.7.0, using 207.95.6.157 as the next-hop gateway.

HPswitch(config)# ip route 207.95.7.0/24 207.95.6.157

When you configure a static IP route, you specify the destination address for the route and the next-hop gateway or routing switch interface through which the routing switch can reach the route. The routing switch adds the route to the IP route table. In this case, Router A knows that 207.95.6.157 is reachable through port A2, and also assumes that local interfaces within that sub-net are on the same port. Router A deduces that IP interface 207.95.7.188 is also on port A2.

The software automatically removes a static IP route from the IP route table if the port used by that route becomes unavailable. When the port becomes available again, the software automatically re-adds the route to the IP route table.

Configuring a Static IP Route

To configure an IP static route with a destination address of 192.0.0.0 255.0.0.0 and a next-hop router IP address of 195.1.1.1, enter the following commands:

HPswitch(config)# ip route 192.0.0.0 255.0.0.0 195.1.1.1

Syntax: ip route <dest-ip-addr>/<mask-bits> <next-hop-ip-addr>

The <dest-ip-addr> is the route’s destination. The <dest-mask> is the network mask for the route’s destination IP address. Alternatively, you can specify the network mask information by entering a forward slash followed by the number of bits in the network mask. For example, you can enter 192.0.0.0 255.255.255.0 as 192.0.0.0/.24.

Configuring the Default Route

You can also assign the default router as the destination by entering 0.0.0.0 0.0.0.0.

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.

16-18