Setup guide

Prefix List Rules

routing prefix-list list <listname>

Property Description

prefix (IP address/mask; default: 0.0.0.0/0) - network prefix to match

prefix-length (integer; default: 0-32) - length (range) of the network prefix in bits

action (accept | reject; default: accept) - action to perform on list member

Notes

There are two different values to match - prefix (i.e. destination address of the route applying the

network mask) and prefix length. Prefix length matches network mask of the received route.

For example, if prefix=172.16.0.0/16 and prefix-length=16-24, then received route for

172.16.24.0/24 will match, but route for 172.16.24.0/25 will not.

Example

To accept the routes to the 172.16.0.0/16 network and any of it's subnetworks that has their network

mask between 16 and 24:

[admin@Wandy] routing prefix-list> list cybernet

[admin@Wandy] routing prefix-list list cybernet> add prefix=172.16.0.0/16 \

\... prefix-length=16-24

[admin@Wandy] routing prefix-list list cybernet> print

# PREFIX PREFIX-LENGTH ACTION

0 172.16.0.0/16 16-24 accept

[admin@Wandy] routing prefix-list list cybernet>

AAA

Document revision 1.7 (Tue May 11 14:13:40 GMT 2004)

This document applies to Wandy RouterOS V2.8

Table of Contents

Summary

Specifications