Using a Prefix Tree

The following example creates a prefix tree that permits routes with a prefix length of 24 or larger in the 10.10.2.0/24 network:

clear ip prefix-tree

• Use to clear all hit counts in the prefix trees or the specified entry from the specified prefix tree. (The router increments the hit count by 1 each time an entry matches.)
• Example

  host1#clear ip prefix-tree xyz

• There is no no version.
• See clear ip prefix-tree.

ip prefix-tree

• Use to create a prefix tree for best route filtering; specifies a tree entry—a deny or permit clause for a network address.
• The prefix tree name can be up to 32 characters long.
• Example

  host1(config)#ip prefix-tree boston42 permit 10.10.2.0/24

• Use the no version to remove the specified prefix tree or the specified tree entry.
• See ip prefix-tree.

match ip address

• Use with the prefix-tree keyword to match routes that have a destination network number address that is permitted by the prefix tree.
• Example

  host1(config-route-map)#match ip address prefix-tree xyz

• Use the no version to delete the match clause from a route map or a specified value from the match clause.
• See match ip address.

match ip next-hop

• Use with the prefix-tree keyword to match routes that have a next-hop router address passed by the specified prefix tree.
• Example

  host1(config-route-map)#match ip next-hop prefix-tree xyz

• Use the no version to delete the match clause from a route map or a specified value from the match clause.
• See match ip next-hop.

match-set summary prefix-tree

• Use to specify the prefix tree that summarizes routes for a particular route map.
• Use the ip prefix-tree command to set the conditions of the prefix tree, including which routes to summarize and how many bits of the network address to preserve.
• Example

  host1(config-route-map)#match-set summary prefix-tree dog3

• Use the no version to disable use of the prefix tree by the route map.
• See match-set summary prefix-tree.

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