Using a Prefix List

The following example creates a prefix list that permits routes with a prefix length up to 24 in the 151.0.0.0/8 network:

host1(config)#ip prefix-list abc permit 151.0.0.0/8 le 24

clear ip prefix-list

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

  host1#clear ip prefix-list abc

  
  



• There is no no version.


• See clear ip prefix-list.

clear ipv6 prefix-list

• Use to clear all hit counts in the IPv6 prefix lists or the specified entry from the specified prefix list. (The router increments the hit count by 1 each time an entry matches.)
• Example
  

  host1#clear ipv6 prefix-list abc

  
  



• There is no no version.


• See clear ipv6 prefix-list.

ip prefix-list

ipv6 prefix-list

• Use to create a prefix list for route filtering and to specify a list entry—a deny or permit clause for a network address—to the prefix list. Use to add entries to prefix lists.
• The prefix list name can be up to 32 characters long.
• Specify the position of each entry in the list with the seq (sequence) keyword. If you do not specify a sequence number, the router uses the value of the last sequence number plus 5.
• Use the ge and le keywords to specify a range of network prefixes. These keywords have the following values:
  • prefix length < ge <= 32
  • prefix length < le <= ge
• If you do not specify either the ge or le keyword, an exact match is expected.
• Example 1—IPv4; exact match required; the router permits only a route with a prefix length of 8 and a network address of 151.0.0.0.
  

  host1(config)#ip prefix-list abc permit 151.0.0.0/8

  
  



• Example 2—IPv6; exact match required; the router permits only a route with a prefix length of 8 and a network address of 1:0:0:0:0:0:0:5.
  

  host1(config)#ipv6 prefix-list abc permit 1::5/8
  



• Use the no version to remove the specified prefix list or the specified list entry.


• See ip prefix-list.


• See ipv6 prefix-list.

match ip address

• Use to specify an access list or use with the prefix-list or prefix-tree keyword to match routes that have a destination network number address that is permitted by any specified access list, prefix list, or prefix tree.
• Example
  

  host1(config-route-map)#match ip address prefix-list abc

  
  



• 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 ipv6 address

• Use to match any route that has a destination network number address that is permitted by the specified access list or prefix list.
• Example
  

  host1(config-route-map)#match ipv6 address prefix-list boston

  
  



• Use the no version to delete all address match clauses from a route map unless you specify an access list or prefix list, in which case only the list match is removed from the route map.


• See match ipv6 address.

match ip next-hop

• Use with the prefix-list keyword to match routes that have a next-hop router address passed by the specified access lists, prefix lists, or prefix trees.
• Example
  

  host1(config-route-map)#match ip next-hop prefix-list abc

  
  



• 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 ipv6 next-hop

• Use to match any routes that have a next-hop router address passed by the specified access list or prefix list.
• Example
  

  host1(config-route-map)#match ipv6 next-hop prefix-list next1

  
  



• Use the no version to delete all next-hop match clauses from a route map unless you specify an access list or prefix list, in which case the router removes only the list match from the route map.


• See match ipv6 next-hop.