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    Multicast Replication on VLANs in Junos Fusion

    Integrated Routing and Bridging (IRB) provides support for Layer 2 bridging and Layer 3 routing on the same interface. IRB interfaces are used to route traffic between VLANs. Replication on the satellite devices occur on Layer 2. The aggregation device manages the replication of data packets at Layer 3. It replicates data for each IRB interface in the layer 3 replication list for a multicast group. It performs a VLAN write for each corresponding VLAN. When there are multiple VLANS and there are multicast receivers on the satellite device in the same group, the aggregation device sends one copy to each IRB with the corresponding VLAN ID to the satellite device. If the IRB interface spans multiple satellite devices, the aggregation device replicates a copy for each satellite device. Each satellite device replicates the data packets for its own extended port.

    When a multicast traffic is received on the xe interface with packets destined for hosts that are connected to extended ports (EP1 through EP5), the aggregation device manages the Layer 3 replication by replicating and forwarding data packets as follows:

    • For the VLAN 100 IRB interface on satellite device 1.
    • For the VLAN 200 IRB interface on satellite device 1.
    • For the VLAN 200 IRB interface on satellite device 2.

    Figure 1 illustrates multicast replication on VLANS in Junos Fusion. Each satellite device manages the Layer 2 processing by replicating data packets for its extended ports. Satellite device 1 replicates the data packets for extended ports EP1 and EP2. Stellite device 2 replicates data packets for extended ports EP4 and EP5.

    Figure 1: Layer 3 Multicast

    Layer 3 Multicast

    Modified: 2016-11-07