Reference Guide

Up to 128 prefix lists may be configured. The maximum number of statements allowed in prefix list is 64.
These numbers indicate only IPv6 prefix lists. IPv4 prefix lists may be configured in appropriate
numbers independently.
Default No prefix lists are configured by default. When neither the ge nor the le option is configured, the
destination prefix must match the network/length exactly. If the ge option is configured without
the le option, any prefix with a network mask greater than or equal to the ge value is considered
a match. Similarly, if the le option is configured without the ge option, a prefix with a network
mask less than or equal to the le value is considered a match.
Format ipv6 prefix-list list-name [seq seq-number] { {permit/deny}
ipv6-prefix/prefix-length [ge ge-value] [le le-value] |
description text | renumber renumber-interval
first-statement-number}
Mode Global Configuration
Parameter Description
list-name
The text name of the prefix list. Up to 32 characters.
seq number (Optional) The sequence number for this prefix list statement. Prefix list statements are
ordered from lowest sequence number to highest and applied in that order. If you do not
specify a sequence number, the system will automatically select a sequence number five
larger than the last sequence number in the list. Two statements may not be configured with
the same sequence number. The value ranges from 1 to 4,294,967,294.
permit Permit routes whose destination prefix matches the statement.
deny Deny routes whose destination prefix matches the statement.
ipv6-
prefix/
prefix-
length
Specifies the match criteria for routes being compared to the prefix list statement. The ipv6-
prefix can be any valid IPv6 prefix where the address is specified in hexadecimal using 16-bit
values between colons. The prefix-length is the The length of the IPv6 prefix, given as a
decimal value that indicates how many of the high-order contiguous bits of the address
comprise the prefix (the network portion of the address). A slash mark must precede the
decimal value.
ge length (Optional) If this option is configured, specifies a prefix length greater than or equal to the
ipv6-prefix/prefix-length. It is the lowest value of a range of the length.
le length (Optional) If this option is configured, specifies a prefix length less than or equal to the ipv6-
prefix/prefix-length. It is the highest value of a range of the length.
Description A description of the prefix list. It can be up to 80 characters in length.
renumber (Optional) Provides the option to renumber the sequence numbers of the IPv6 prefix list
statements with a given interval starting from a particular sequence number.
The following example configures a prefix list that allows routes with one of two specific destination
prefixes, 2001::/64 and 5F00::/48:
(R1)(config)# ipv6 prefix-list apple seq 10 permit 2001::/64
(R1)(config)# ipv6 prefix-list apple seq 20 permit 5F00::/48
no ipv6 prefix-list
Use this command to deletes either the entire prefix list or an individual statement from a prefix list.
Routing Commands
ExtremeSwitching 200 Series: Command Reference Guide for version 01 .02.04.0007 534