Allied Telesis Rapier 16Fi-FX Installationsanleitung PDF herunterladen (Seite 114)

20 Software Reference

Any of the four octets of the IP address may be replaced by an asterisk (*) to

enable wildcard matches.

To add more ports to an association, use the command:

add ip igmp destination=ipaddress interface=interface

port={all|port-list}

Unlike dynamic IGMP group membership information, static IGMP

associations never time out. If the network configuration changes, they must be

manually modified. To delete ports from an association, use the command:

delete ip igmp destination=ipaddress interface=interface

port={all|port-list}

To remove an association from a switch, use the command:

destroy ip igmp destination=ipaddress interface=interface

To enable or disable IGMP debugging of destination and source IP addresses,

use the commands:

enable ip igmp debug [destination={all|ipaddress}]

[sourceipaddress={all|ipaddress2}]

disable ip igmp debug

Debugging is disabled by default. To display which debugging options are set,

use the command:

show ip igmp debug

IGMP Proxy

In a network with a simple tree topology, you can use IGMP proxy to simply

the configuration of multicast routing. The switch at the root of the tree must

run a multicast routing protocol, but all other switches in the network can be

configured as IGMP proxy agents.

The IGMP proxy agent must be configured with a single upstream interface

and one or more downstream interfaces. An upstream interface is an interface

in the direction towards the root of the tree. A downstream interface is an

interface in the direction away from the root of the tree.

The IGMP proxy agent periodically transmits IGMP general membership

queries to the hosts attached to its downstream interfaces. The proxy agent

uses IGMP report and leave messages received on downstream interfaces to

build and maintain a database of multicast group memberships, and reports

changes to the list of multicast groups in the database on the upstream

interface. The following table summarises how the IGMP proxy agent

processes each IGMP message type.

When this message... Is received on this interface... Then the IGMP proxy agent...

Report downstream • adds the membership subscription to the multicast

group membership database

• forwards the report message on the upstream interface,

if the membership subscription is for a new multicast

group

upstream • discards the message without processing

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