Allied Telesis AT-8824 Installationsanleitung PDF herunterladen (Seite 130)

2-8 Release Note

Software Version 2.7.5

C613-10454-00 REV A

About IP Filters

Description An IP filter filters routes if it has a filter ID number in the range 300 to 399. It

matches on the source and mask of the route, and specifies whether matching

routes are included or excluded.

When to use

IP filters

Use an IP filter when you want to filter routes that the router or switch imports

from BGP into OSPF. “Applying Filters When Redistributing from the RIB” on

page 2-23 has more information.

You can also use an IP filter as a BGP prefix filter (either an infilter or an

outfilter), but we recommend you use a prefix list instead.

Creating Filters

This section describes the commands, options and procedures for creating each

of the different types of filter. It contains the following subsections:

■ Creating Prefix Lists

■ Creating AS Path Lists for BGP

■ Creating Route Maps for BGP

■ Creating Route Maps for OSPF

■ Creating IP Route Filters

■ Creating IP Filters

Creating Prefix Lists

To create a prefix list and add entries to it, use the command:

add ip prefixlist=name entry=1..65535

[action={match|nomatch}] [masklength=range] [prefix=ipadd]

The masklength parameter specifies the range of prefix mask lengths matched

by this entry in the prefix list. The range is either a single CIDR mask from 0 to

32, or two masks separated by a hyphen. These options are valid for setting the

mask length:

■ As a mask length range (masklength=a-b).

For a route to match against this entry, its prefix mask length must be

between a and b inclusive. a must be less than b.

■ As a single mask length (masklength=a).

For a route to match against this entry, its prefix mask length must be

exactly a.

■ As an implicit mask length, by not specifying masklength (for example,

prefix=192.168.0.0).

For a route to match against this entry, its prefix mask length must

correspond exactly to the mask for the class of the given address—in this

example, 24.

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Allied Telesis AT-8824 Installationsanleitung Seite 130