Using Policy Rules to Provide Routing Solutions

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The next-interface, next-hop, filter, and forward rules provide routing solutions for traffic matching a classifier. A classifier can have only one action that provides a routing solution.

If you configure two routing solution rules, such as filter and forward, in the same classifier group, the router displays a warning message, and the rule configured last replaces the previous rule.

For IP policy lists, policy rules are available to enable you to make a forwarding decision that includes the next interface and next hop:

Forward next interface—Causes an interface to forward all packets that satisfy the classification associated with that rule to the next interface specified
Forward next hop—Causes an interface to forward all packets that satisfy the classification associated with that rule to the next-hop address specified

For example, you can route packets arriving at IP interface ATM 0/0.0 so that they area handled as indicated:

Packets from source 1.1.1.1 are forwarded out of interface ATM 0/0.1.
Packets from source 2.2.2.2 are forwarded out of interface ATM 2/1.1.
All other packets are dropped.

To configure this routing policy, issue the following commands:



host1(config)#ip classifier-list claclA ip
host 1.1.1.1 any 

host1(config)#ip classifier-list claclB ip
host 2.2.2.2 any 

host1(config)#ip policy-list IpPolicy100 

host1(config-policy-list)#classifier-group
claclA  

host1(config-policy-list-classifier-group)#forward interface atm 0/0.1 

host1(config-policy-list-classifier-group)#exit 

host1(config-policy-list)#classifier-group
claclB  

host1(config-policy-list-classifier-group)#forward interface atm 2/1.1  

host1(config-policy-list-classifier-group)#exit

host1(config-policy-list)#classifier-group *  

host1(config-policy-list-classifier-group)#filter  

host1(config-policy-list-classifier-group)#exit

 

host1(config)#interface atm 0/0.0 

host1(config-subif)#ip policy input IpPolicy100
statistics enabled

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