3Com 10014299 manual Configure IP Routing, Define a Routing Policy, Delete a routing policy

Configure IP Routing Policy 481

community. Actually, it is a method of grouping according to the destination address where the packets are sent. After grouping, the whole group of routing information should be distributed, received or imported. The community-list is an access list based on community information, used for the BGP protocol. Its matching object is the community field of BGP routing information.

Community-list definition is already implemented in BGP configuration. See the description of the ip community-listcommand in “Configuring a BGP Community”.

Configure IP Routing	Configuring an IP routing policy includes tasks that are described in the following
Policy	sections:
	■ Defining a Routing Policy
	■ Define a Matching Rules
	■ Defining an Apply Clause
	■	Configuring Route Import
	■ Defining an IP Prefix List
	■	Configuring Route Filter
Defining a Routing	A routing policy consists of several parts and each part has its own if-match
Policy	clauses and applies clauses, with sequence-numberspecifying the matching order
	of these parts.
	Perform the following configurations in system view.
	Table 560 Define a Routing Policy
	Operation		Command
	Define a routing policy and enter into the		route-policy policy-name{ permit
	routing policy view.		deny } { seq-number }
	Delete a routing policy		undo route-policy policy-name[
			permit deny ] [seq-number]

By default, no routing policy is defined.

permit specifies the matching mode of the defined routing policy node as permit mode. When the route item satisfies all if-match clauses of the node, it is permitted to pass the filtering of this node and execute apply clauses of this node. If the route item does not satisfy the if-match clauses of this node, the next node of this routing policy is tested.

deny specifies the matching mode of the defined routing policy node as deny mode. When the route item satisfies all if-match clauses of this node, it is rejected and the next node is nottested.

Please note that the parts of different seq-numberuse Boolean “OR” operations. Namely, route information matches every part in turn. Through a certain part of routing policy defines filtering through this routing policy.