Allied Telesis Patch 86261-04 Instrukcja Użytkownika Pobierz pdf (Strona 41)

Patch 86261-09 For Rapier and AT-8800 Series Switches SHOW IGMPSNOOPING ROUTERADDRESS 41

Patch 86261-09 for Software Release 2.6.1

C613-10388-00 REV J

When the limit is reached, the importing of routes will stop until existing

routes are removed. Because they are BGP routes, actions of BGP control when

the routes disappear.

The other way to limit the imported routes is to configure a routing filter. This

filter is used in conjunction with the /jointfilesconvert/412162/bgpfilter parameter in the set ospf

command to control the passing of routing information in and out of the

device. To configure a filter, use the add ip filter command:

add ip filter=filter-number {action=include|exclude}

source=ipadd [smask=ipadd] [entry=entry-number]

Use this filter to limit imported BGP routes with the command:

set ospf /jointfilesconvert/412162/bgpfilter=300...399

where the filter number is the previously configured filter.

Take care when configuring the IP filter. If the number of imported routes

reaches the /jointfilesconvert/412162/bgplimit parameter, you may not have imported all the routes

specified with the /jointfilesconvert/412162/bgpfilter parameter.

Advertising desired

routes

The order in which routes are added is arbitrary. This means that to have

desired BGP routes advertised by OSPF, you must take care setting the entry

number for the route filter with the add ip route command. Assign a low entry

number to a filter used to import preferred BGP routes. Alternatively, set the

/jointfilesconvert/412162/bgplimit parameter above the total number of routes that BGP will ever add to

the routing table.

Configuration

example

This example supposes that you want to import the route 192.168.72.0 into the

OSPF routing domain, but no other routes. This route is received on the

gateway router as a BGP route. The following steps show the sequence of

commands to use in this scenario.

1. Set up the IP filter:

add ip filter=300 source=192.168.72.0 smask=255.255.255.255

action=include

2. Set up OSPF BGP import parameters:

set ospf /jointfilesconvert/412162/bgpimport=on /jointfilesconvert/412162/bgpfilter=300 /jointfilesconvert/412162/bgplimit=1

3. Check that BGP has added the route to the IP route table:

show ip route=192.168.72.0

The route should be visible in the output of the command.

4. Check that OSPF has imported the route:

show ospf lsa=192.168.72.0

The output should show that there is an AS external LSA with this ID.

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