The last-member query interval is the maximum amount of time between group-specific
query messages, including those sent in response to leave-group messages.
By default, the last-member query interval is 1 second. You can configure any value in
the range 0.1 through 0.9 seconds, and then 1-second intervals from 1 through 1024
seconds.
•
query-response-interval—Configures how long the router waits to receive a response
from its host-query messages.
By default, the query response interval is 10 seconds. You can configure any value in
the range 1 through 1024 seconds. This interval should be less than the interval set in
the query-interval statement.
•
robust-count—Provides fine-tuning to allow for expected packet loss on a subnet. It is
basically the number of intervals to wait before timing out a group. You can wait more
intervals if subnet packet loss is high and IGMP report messages might be lost.
By default, the robust count is 2. You can configure any value in the range 2 through 10
intervals.
•
group-limit—Configures a limit for the number of multicast groups (or [S,G] channels
in IGMPv3) that can join an interface. After this limit is reached, new reports are ignored
and all related flows are discarded, not flooded.
By default, there is no limit to the number of groups that can join an interface. You can
configure a limit in the range 0 through a 32-bit number.
•
host-only-interface—Configure an IGMP snooping interface to be an exclusively host-side
interface. On a host-side interface, received IGMP queries are dropped.
By default, an interface can face either other multicast routers or hosts.
•
multicast-router-interface—Configures an IGMP snooping interface to be an exclusively
router-facing interface.
By default, an interface can face either other multicast routers or hosts.
•
static—Configures an IGMP snooping interface with multicast groups statically.
By default, the router learns about multicast groups on the interface dynamically.
Figure 24 on page 482 shows networks without IGMP snooping. Suppose host A is an IP
multicast sender and hosts B and C are multicast receivers. The router forwards IP
multicast traffic only to those segments with registered receivers (hosts B and C).
However, the Layer 2 devices flood the traffic to all hosts on all interfaces.
481Copyright © 2017, Juniper Networks, Inc.
Chapter 15: Configuring Internet Group Management Protocol Snooping
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