Manual:Routing/Prefix list

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Applies to RouterOS: 2.9, v3, v4 +

Sub-menu: /routing prefix-list


Filtering by prefix list involves matching the prefixes of routes with those listed in the prefix list. When there is a match, the rule is used. The prefix lists can be used to filter out RIP routes, and are used if specified under /routing rip interface.


Property Description
action (accept | discard; Default: accept) action to perform on route matching the rule
chain (string; Default: "") chain name to place this rule in. If a chain with the specified name does not exist it will be automatically created
invert-math (yes | no; Default: no) invert this match, i.e. apply the rule to routes that would fail to match it and vice versa
prefix (IP prefix; Default: 0.0.0.0/0) network prefix to match. If prefix-length is not set, only exact match is done. For example, 0.0.0.0/0 then matches only the default route and nothing else
prefix-length (integer; Default: 0-32) network prefix mask length to match. If prefix-length is set, for a route to match the prefix and prefix-length of a rule, the following should hold:
  • the network prefix of the route falls within the range of the prefix of the rule, (i.e.
  • the network mask of the route is greater of equal than the network mask of the prefix;
  • the network address of the route masked out by the network mask of the prefix is equal to the network address of the prefix;)
  • the length of the network mask of the route falls within the range of the prefix-length
set-metric (integer; Default: ) Set metric