mode (Multicast VLAN Registration)
Statement introduced in Junos OS Release 18.3R1 for EX4300 switches.
Support added in Junos OS Release 18.4R1 for EX2300 and EX3400 switches.
Configure the operating mode for a Multicast VLAN Registration (MVR) receiver VLAN.
A multicast VLAN (MVLAN) forwards multicast streams to interfaces on other VLANs that are configured as MVR receiver VLANs for that MVLAN, and can operate in either of two modes, transparent or proxy. The mode setting affects how IGMP reports are sent to the upstream multicast router. In transparent mode, the device sends IGMP reports out of the MVR receiver VLAN, and in proxy mode, the device sends IGMP reports out of the MVLAN.
We recommend that you configure proxy mode on devices that are closest to the upstream multicast router, because in transparent mode, IGMP reports are only sent out on the MVR receiver VLAN. As a result, MVR receiver ports receiving an IGMP query from an upstream router on the MVLAN will only reply on MVR receiver VLAN multicast router ports, the upstream router will not receive the replies, and the upstream router will not continue to forward traffic. In proxy mode, IGMP reports are sent out on the MVLAN for its MVR receiver VLANs, so the upstream multicast router receives IGMP replies on the MVLAN and continues to forward the multicast traffic on the MVLAN.
In either mode, the device forms multicast group memberships on the MVLAN, and IGMP queries and forwards multicast traffic received on the MVLAN to subscribers in MVR receiver VLANs tagged with the MVLAN tag by default. If you also configure the translate option at the [edit protocols igmp-snooping vlans vlan-name data-forwarding receiver] hierarchy level for hosts on trunk ports in MVR receiver VLANs, then upon egress, the device translates MVLAN tags into the MVR receiver VLAN tags instead.
This statement is available to configure the MVR mode only on devices that support the Enhanced Layer 2 Software (ELS) configuration style. Devices with software that does not support ELS operate in transparent mode by default, or operate in proxy mode if you configure the proxy statement at the [edit protocols igmp-snooping vlan vlan-name] hierarchy level for a VLAN configured as a data-forwarding VLAN.
When a host on an MVR receiver VLAN joins a multicast group, the device installs a bridging entry on the MVLAN and forwards MVLAN traffic for that group to the host, even though the host is not in the MVLAN. You can also configure the device to install the bridging entries on the MVR receiver VLAN (see the install option at the [edit protocols igmp-snooping vlans vlan-name data-forwarding receiver] hierarchy level).
When a host on an MVR receiver VLAN joins a multicast group, the device installs a bridging entry on the MVLAN, and subsequently forwards MVLAN traffic for that group to the host although the host is not in the MVLAN. You cannot configure the install option to install the bridging entries on the MVR receiver VLAN for a data-forwarding MVR receiver VLAN that is configured in proxy mode.
Required Privilege Level
routing—To view this statement in the
routing-control—To add this statement to the configuration.