Figure 7: Upstream and Downstream Interfaces
As described in “IGMP Overview” on page 42, earlier in this chapter, hosts interact with
the router through the exchange of IGMP messages. Similarly, when you configure IGMP
proxy, the router interacts with the router on its upstream interface through the exchange
of IGMP messages. However, when acting as the proxy, the router performs the host
portion of the IGMP task on the upstream interface, as follows:
•
When queried, sends group membership reports to the group.
•
When one of its hosts joins a multicast address group to which none of its other hosts
belong, sends unsolicited group membership reports to that group.
•
When the last of its hosts in a particular multicast group leaves the group, sends an
unsolicited leave group membership report to the all-routers group (244.0.0.2).
Configuring IGMP Proxy
To configure a downstream interface, enable IGMP on that interface. To configure IGMP
proxy on the router, complete the following tasks:
1. Enable IP multicast.
host1(config)#ip multicast-routing
2. Identify the interface that you want to act as the upstream interface.
3. Enable IGMP proxy on that interface.
host1(config-if)#ip igmp-proxy
4. (Optional) Specify how often the router sends unsolicited reports to routers on the
upstream interface.
host1(config-if)#ip igmp-proxy unsolicited-report-interval 600
5. (Optional) Specify how long the router calculates an IGMPv1 querier router to exists
on the subnetwork after the router receives an IGMPv1 query on this interface.
host1(config-if)#ip igmp-proxy V1-router-present-time 600
Copyright © 2010, Juniper Networks, Inc.70
JunosE 11.2.x Multicast Routing Configuration Guide
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