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Layer 2 Features

  • Support for Q-in-Q tunneling with L2 swap-push/pop-swap configuration (EX2300, EX4100, EX4300, EX4300-MP, EX4400, EX4400-MP)—Starting in Junos OS Release 23.4R1, you can configure Q-in-Q tunneling with L2 swap-push/pop-swap in which the customer VLAN (C-VLAN) tag is swapped with the inner-vlan-id tag, and the service-provider-defined service VLAN (S-VLAN) tag is pushed on it (for traffic flowing from customer to service provider site). For the traffic flowing from the service provider network to the customer network, we've removed the S-VLAN tag, and replaced the C-VLAN tag with the VLAN ID configured on the UNI logical interface.

    [See Configuring Q-in-Q Tunneling and VLAN Q-in-Q Tunneling and VLAN Translation.]

  • Q-in-Q support on redundant trunk links using LAGs with link protection (EX4100-48MP and EX4400-48F)—Starting in Junos OS Release 23.4R1, we now support Q-in-Q on redundant trunk links (also called “RTGs”) using LAGs with link protection. Redundant trunk links provide a simple solution for network recovery when a trunk port on a switch goes down. In this case, traffic is routed to another trunk port, keeping network convergence time to a minimum.

    Q-in-Q support on redundant trunk links on a LAG with link protection also includes support for the following items:

    • Configuration of flexible VLAN tagging on the same LAG that supports the redundant links configurations.
    • Multiple redundant links configurations on one physical interface.
    • Multicast convergence.

    [See Q-in-Q Support on Redundant Trunk Links Using LAGs with Link Protection.]