Juniper ACX2000

CHAPTER 22
Configuring Multicast Listener Discovery
and Protocol-Independent Multicast
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Understanding MLD in ACX Series on page 669
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Enabling MLD on page 671
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PIM Overview on page 672
•
Designated Router on page 675
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Understanding PIM Sparse Mode on page 675
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PIM Configuration Statements on page 678
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Changing the PIM Version on page 680
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Modifying the PIM Hello Interval on page 681
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PIM on Aggregated Interfaces on page 682
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Enabling PIM Sparse Mode on page 682
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Configuring BFD for PIM in ACX Series on page 683
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Configuring PIM Trace Options on page 685
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Disabling PIM on page 687
Understanding MLD in ACX Series
The Multicast Listener Discovery (MLD) Protocol manages the membership of hosts and
routers in multicast groups. IP version 6 (IPv6) multicast routers use MLD to learn, for
each of their attached physical networks, which groups have interested listeners. Each
router maintains a list of host multicast addresses that have listeners. The router provides
addresses to the multicast routing protocol, which ensures that multicast packets are
delivered to interested listeners. In this way, MLD is used as the transport for the Protocol
Independent Multicast (PIM) Protocol.
MLD is an integral part of IPv6 and must be enabled on all IPv6 routers and hosts that
need to receive IP multicast traffic. The Junos OS supports MLD versions 1 and 2. Version
2 is supported for source-specific multicast (SSM) include and exclude modes.
In include mode, the receiver specifies the source or sources it is interested in receiving
the multicast group traffic from. Exclude mode works the opposite of include mode. It
669Copyright © 2017, Juniper Networks, Inc.