one or more multicast routers, it is retransmitted. The number of times it is retransmitted
is the robust count minus one. In IGMPv3, the robust count is also a factor in determining
the group membership interval, the older version querier interval, and the other querier
present interval.
By default, the robustness variable is set to 2. You might want to increase this value if
you expect a subnet to lose packets.
The number can be from 2 through 10.
To change the value of the robustness variable:
1. Configure the robust count.
When you set the robust count, you are in effect configuring the number of times the
querier retries queries on the connected subnets.
[edit protocols igmp]
user@host# set robust-count 5
2. Verify the configuration by checking the IGMP Robustness Count field in the output
of the show igmp interfaces command.
Related
Documentation
Modifying the IGMP Host-Query Message Interval on page 450•
• Modifying the IGMP Query Response Interval on page 451
• Modifying the IGMP Last-Member Query Interval on page 455
• show pim interfaces
• RFC 2236, Internet Group Management Protocol, Version 2
• RFC 3376, Internet Group Management Protocol, Version 3
Limiting the Maximum IGMP Message Rate
This section describes how to change the limit for the maximum number of IGMP packets
transmitted in 1 second by the router.
Increasing the maximum number of IGMP packets transmitted per second might be
useful on a router with a large number of interfaces participating in IGMP.
To change the limit for the maximum number of IGMP packets the router can transmit
in 1 second, include the maximum-transmit-rate statement and specify the maximum
number of packets per second to be transmitted.
Related
Documentation
maximum-transmit-rate (Protocols IGMP)•
457Copyright © 2017, Juniper Networks, Inc.
Chapter 14: Configuring Internet Group Management Protocol
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