Configure an IPv6 Prefix List

Use IPv6 prefix lists to allow or deny specific IPv6 route updates. A prefix list policy specifies route prefixes to match. When there is a match, the route is used.

About this task

You configure prefix lists on a VRF instance the same way you configure the GlobalRouter, except that you must use VRF Router Configuration mode.

Procedure

Enter Global Configuration mode:

enable

configure terminal
Create an IPv6 prefix list:

ipv6 prefix-list <WORD 1-64> <WORD 1–256> [ge <0–128>] [le <0–128>] [id <1-2147483647>]

Use the same command to add additional prefixes to the list.
To rename the list:

ipv6 prefix-list <WORD 1–64> name <WORD 1–64>
Display the prefix list:

show ipv6 prefix-list <WORD 1–256> [vrf WORD<1-16>] [vrfids WORD<1-512>] [WORD <1-64>]

Example

Create an IPv6 prefix list:

Switch:1<config>#ipv6 prefix-list list4 2001:DB8::/32  ge 32 le 32

To rename the list:

Switch:1<config>#ipv6 prefix-list list4 name list5

Variable Definitions

Use the data in the following table to use the ipv6 prefix-list command.


Variable	Value
<WORD 1–64>	Specifies the IPv6 prefix-list name.
<WORD 1–256>	Specifies the IPv6 prefix and length.
ge <0–128>	Specifies the minimum length to match. Lower bound and higher bound mask lengths together can define a range of networks.
id <1-2147483647>	Specifies the Prefix list ID.
le <0–128>	Specifies the maximum length to match. Lower bound and higher bound mask lengths together can define a range of networks.
name <WORD 1–64>	Names the prefix list. The default value is none.

Use the data in the following table to use the show ipv6 prefix-list command.


Variable	Value
<WORD 1–256>	Specifies the IPv6 prefix and length.
vrf WORD<1-16>	Specifies the name of the VRF.
vrfids WORD<0-512>	Specifies the ID of the VRF and is an integer in the range of 0–512.
WORD<1-64>	Specifies a prefix list, by name, to use for the command output.