Install guide

IP Multicasting 21
The IGMP proxy agent uses the information maintained in the multicast group
membership database to forward multicast data packets received on the
upstream interface to all downstream interfaces that have members of the
multicast group.
Multicast packet forwarding is enabled as long as:
■ a multicast routing protocol is not enabled
■ an interface is configured with IGMP proxy in the upstream direction
■ at least one interface is configured with IGMP proxy in the downstream
direction
To add an IP interface and configure IGMP proxying, use the command:
add ip interface=interface ipaddress={ipadd|dhcp}
[igmpproxy={off|upstream|downstream}] [other-options...]
To configure IGMP proxy on an existing IP interface, use the command:
set ip interface=interface
igmpproxy={off|upstream|downstream}]
IGMP proxy is turned off by default.
IGMP must also be enabled on the switch and on the interface for IGMP proxy
to function.
To enable IGMP on the switch, use the command:
enable ip igmp
To enable IGMP on a specific interface, use the command:
enable ip igmp interface=interface
Leave downstream • removes the membership subscription from the
multicast group membership database
• forwards the leave message on the upstream interface,
if there are no remaining membership subscriptions for
the multicast group (no other hosts connected to any of
the downstream interfaces have members of the
multicast group)
upstream • discards the message without processing
Group-specific query downstream • discards the message without processing
upstream • transmits a report message on the upstream interface,
if the multicast group membership database contains at
least one member of the multicast group attached to a
downstream interface
General query downstream • discards the message without processing
upstream • transmits a report message on the upstream interface
for each multicast group in the multicast group
membership database with at least one member
attached to a downstream interface
When this message... Is received on this interface... Then the IGMP proxy agent...