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Document No. 650-100-700, Issue 1 12-23
Configuring IP Routing
When packets are sent to the null interface, the router sends an
Internet
Control Message Protocol (ICMP)
destination unreachable message to
the source of the packet (Router 3 in Figure 12-7 ).
Procedure
Web Agent
Procedure
To create a static route to a null interface:
1. In the navigation pane, expand the Routing > IP > Configuration
folders.
2. Click Static Routes. The IP Static Routes Web page is displayed in the
content pane.
3. Click CREATE. The Add IP Static Route Web page is displayed in the
content pane. See Figure 12-6 .
4. In the Network Address field, enter the IP address of the network for
which you are creating a null interface.
5. In the Mask field, enter the subnet mask for the network.
6. In the Next-Hop Address field, enter null 0.
7. In the Cost field, enter the routing metric of the path. For an explanation
of this field, see Table 12-5 .
8. In the Preference field, select either high or low. For an explanation of
this field, see Table 12-5 .
9. Click APPLY.
CLI Command
To create a static route to a null interface, use the following CLI command:
(configure)#
ip route <route-addr> <mask> null 0 <cost>
For example, to create the static route to the null interface in Figure 12-7 ,
you would enter ip route 10.10.0.0 255.255.0.0 null 0 <cost>.