
Customizing IGMP
114064 Rev. A 3-3
If at least one host on the local network specifies that it is a member of a given
group, the router will forward to that network all datagrams bearing the group’s
multicast address.
Host Leave Messages
When a Version 2 host leaves a group, it issues a Host Leave message. The
multicast router on the network issues a host query to determine whether there are
other group members on the network. If no host responds to the query, the router
assumes that no members belonging to that group exist on that interface.
Upon initialization, the host may immediately issue a report for each of its
supported multicast groups. The router accepts and processes these asynchronous
reports the same way it accepts requested reports.
Once in a steady state, hosts and routers communicate in a way that minimizes the
exchange of queries and reports.
Configuring IGMP on the Router
The following sections show you how to configure IGMP features on the router
using Site Manager.
Enabling and Disabling IGMP
When you configure IGMP on the router, IGMP is automatically enabled.You can
use Site Manager to disable and re-enable IGMP on the router.
Site Manager: Enable parameter: page A-13
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