Allied Telesis AT-8824 Installationsanleitung PDF herunterladen (Seite 144)

2-22 Release Note

Software Version 2.7.5

C613-10454-00 REV A

Applying route maps To use a route map to filter or modify update messages that it receives from a

peer, use one of the commands:

add /jointfilesconvert/427458/bgp peer=ipadd remoteas=asn inroutemap=routemap

[other-options]

set /jointfilesconvert/427458/bgp peer=ipadd inroutemap=routemap [other-options]

The router or switch checks every route in the update message against every

entry in the filter, starting with the entry with the lowest entry number, until it

finds a match or gets to the end of the filter.

Filtering OSPF routes when writing to the RIB

To filter OSPF routes before adding them to the RIB, first create a route map

that matches on the appropriate route characteristics. Then use the route map

in the command:

set ospf inroutemap=routemap

Plan your filters carefully. If a filter excludes a matching route from the RIB,

OSPF does not advertise a summary LSA for that route because summary LSA

messages are derived from the filtered RIB. This means that incorrect filters can

prevent Area Border Routers from advertising routes to other areas.

Filtering RIP routes when writing to the RIB

To filter RIP routes before adding them to the RIB, simply create a filter or

series of filters, using the command:

add ip route filter[=filter-id] ip=ipadd mask=ipadd

action={include|exclude} protocol=rip direction=receive

[other-options]

The router or switch automatically applies the filter when importing RIP

routes, because protocol=rip.

The immediate effect of a route filter with direction set to receive and action

set to exclude is that route advertisements received matching the filter do not

result in a new entry in the local RIB. However, routes already in the RIB are

not deleted even when they match the route filter. Therefore, if you

dynamically add a route filter at the manager prompt, you may also need to

manually delete unwanted routes from the RIB.

Filtering invalid when writing static and interface routes to

the RIB

You cannot filter in a way that excludes statically-configured or interface routes

from the RIB.

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Allied Telesis AT-8824 Installationsanleitung Seite 144