Allied Telesis AT-8824 Installationsanleitung PDF herunterladen (Seite 135)

Filtering IP Routes 2-13

Software Version 2.7.5

C613-10454-00 REV A

Matching on

MED

An entry that matches on med lets you select or discard routes with a

particular Multi Exit Discriminator metric. BGP can use the MED to determine

the best route to a destination. To match on MED, use the command:

add ip routemap=routemap entry=1..4294967295

[action={include|exclude}] match med=0..4294967295

Matching on

next hop

An entry that matches on nexthop lets you select or discard routes that traverse

a particular node. To do this, use the command:

add ip routemap=routemap entry=1..4294967295

[action={include|exclude}] match nexthop=ipadd

Matching on

origin

An entry that matches on origin lets you select or discard routes depending on

how BGP learned them: internally, externally, or from another means (such as

statically-configured routes). To do this, use the command:

add ip routemap=routemap entry=1..4294967295

[action={include|exclude}] match

origin={egp|igp|incomplete}

Matching on

prefix list

An entry that matches on prefixlist lets you select or discard routes to a list of

destinations.

To do this, first create the prefix list and add entries to it by using the

command:

add ip prefixlist=name entry=1..65535

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

See “Creating Prefix Lists” on page 2-8 for more information.

Then use the prefix list in the match clause of a route map by using the

command:

add ip routemap=routemap entry=1..4294967295

[action={include|exclude}] match prefixlist=name

All the match options described previously—AS path, community, next hop

and origin—match on the attributes in an update message. Prefix list does not;

it matches prefixes.

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Allied Telesis AT-8824 Installationsanleitung Seite 135