How does qualified learning for virtual private LAN service operate?
The following illustration shows a sample topology used to answer this question:
Traffic type and direction: unknown unicast from CE1 VLAN700 to CE2 VLAN700.
In this example, first assume that Router PE2 is a Juniper Networks MX Series 3D Universal Edge Router. The packets from Router CE1 for VLAN700 are flooded from Router PE2 only on the ports connected to VLAN700. This behavior is VPLS qualified learning. MX Series routers perform qualified lookups and qualified learning.
You can use the monitor interface and show interface queue commands to verify this behavior.
For more information, click Layer 2 VPNs and VPLS Feature Guide.