Changing The Igmp Version - Juniper ACX1000 Configuration Manual

ACX Series Universal Access Router Configuration Guide

Changing the IGMP Version

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By default, the routing device runs IGMPv2. Routing devices running different versions of
IGMP determine the lowest common version of IGMP that is supported by hosts on their
subnet and operate in that version.
To enable source-specific multicast (SSM) functionality, you must configure version 3
on the host and the host's directly connected routing device. If a source address is specified
in a multicast group that is statically configured, the version must be set to IGMPv3.
If a static multicast group is configured with the source address defined, and the IGMP
version is configured to be version 2, the source is ignored and only the group is added.
In this case, the join is treated as an IGMPv2 group join.
BEST PRACTICE:
interface hierarchy level, it overrides the
new interface does not inherit the version number that you specified with the
statement. By default, that new interface is enabled with
interface all
. You must explicitly specify a
2
For example, if you specified
configure the
version 3
configure an interface for a multicast group at the
static group multicast-group-address]
as well as the other group parameters. Otherwise, the interface is
number
enabled with the default
If you have already configured the routing device to use IGMP version 1 (IGMPv1) and then
configure it to use IGMPv2, the routing device continues to use IGMPv1 for up to 6 minutes
and then uses IGMPv2.
To change to IGMPv3 for SSM functionality:
Configure the IGMP interface.
1.
[edit protocols igmp]
user@host# set interface ge-0/0/0 version 3
Verify the configuration by checking the version field in the output of the
2.
interfaces command. The
fields, such as V1 Membership Report, V2 Membership Report, and V3 Membership
Report.
CAUTION: On MX Series platforms, IGMPv2 and IGMPv3 can or cannot be
configured together on the same interface, depending on the Junos OS release
at your installation. Configuring both together can cause unexpected behavior
in multicast traffic forwarding.
If you configure the IGMP version setting at the individual
interface all
version number
version 3 with interface all
statement for the new interface. Additionally, if you
hierarchy level, you must specify a
.
version 2
show igmp statistics command has version-specific output
statement. That is, the
version
when adding a new interface.
, you would need to
[edit interface interface-name
version
show igmp
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