mld-snooping

List of Syntax

Syntax (SRX Series, EX Series)

Syntax (MX Series, EX9200)

Hierarchy Level

Release Information

Statement introduced in Junos OS Release 12.1 for EX Series switches.

Statement introduced in Junos OS Release 14.2 for MX Series routers with MPC.

Statement introduced in Junos OS Release 18.1R1 for SRX1500 devices.

Description

Enable and configure MLD snooping. MLD snooping constrains IPv6 multicast traffic at Layer 2 by configuring Layer 2 LAN ports dynamically to forward IPv6 multicast traffic only to those ports that want to receive it.

More Information: Multicast Listener Discovery (MLD) is a protocol built on ICMPv6 and used by IPv6 routers and hosts to discover and indicate interest in a multicast group. There are two versions, MLDv1 (RFC 2710) which is equivalent to IGMPv2, and MLDv2 (RFC 3810), which is equivalent to IGMPv3. Both MLDv1 and MLDv2 support Query, Report and Done messages, just as IGMP. MLDv2 further supports source-specific Queries/Reports and multi-record Reports.

For MX Series devices, MLD snooping restricts the forwarding of IPv6 multicast traffic to only those interfaces in a bridge-domain/VPLS that have interested listeners. Rather than flooding all interfaces in the bridge-domain/VPLS, MLD snooping restricts the forwarding of IPv6 multicast traffic to only those interfaces in a bridge-domain/VPLS that have interested listeners. These interfaces are identified by snooping MLD control packets, identifying the set of outgoing interfaces for a multicast stream, and building forwarding state accordingly. Queries will be snooped and flooded to all ports; Report and Done messages are snooped and selectively forwarded to multicast router ports only.

The remaining statements are explained separately. See CLI Explorer.

Required Privilege Level

routing—To view this statement in the configuration.

routing-control—To add this statement to the configuration.