Manual:Routing/Prefix list

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