Allied Telesis AT-8824 Guía de instalación descargar pdf (Pagina 133)

Filtering IP Routes 2-11

Software Version 2.7.5

C613-10454-00 REV A

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

command:

add ip routemap=routemap entry=1..4294967295

[action={include|exclude}] match aspath=1..99

When the router or switch uses this route map to examine an update message,

the router or switch goes through the entries in the AS path list. The update

matches if an entry in the AS path list matches the AS path in the update

message, and that AS path list entry is an include entry.

If the update message matches, the router or switch carries out the action of the

route map; one of:

■ exclude the update message

■ include the update message without modification

■ include the update message and modify its attributes

Note that the action (include/exclude) of the AS path list and the action of the

route map entry are separate. The following table shows the effect of each

combination.

In this context, the parameters include and exclude in the AS path list do not

indicate whether the matching update message is allowed or dropped; they

simply indicate whether the update matches or does not match the path list.

This is different to the behaviour when you use the AS path list itself as a filter,

as described in “Applying Filters” on page 2-20.

AS path list entry Route map entry Action when route map applied

include include An update message with that AS_path

matches, and is processed

include exclude An update message with that AS_path

matches, and is discarded

exclude include An update message with that AS_path does

not match. The router or switch continues

checking to see if the update message

matches other entries in the route map.

exclude exclude An update message with that AS_path does

not match. The router or switch continues

checking to see if the update message

matches other entries in the route map.

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Allied Telesis AT-8824 Guía de instalación Pagina 133