Precedence of Port-Mirroring Instances at Different Levels of the Chassis

If port-mirroring instances are configured at multiple levels in the MX-series router hierarchy, the port-mirroring properties are applied as follows:

1. For chassis-level Layer 2 port mirroring, configured by including the port-mirroring statement at the [edit forwarding-options] hierarchy level, the global port-mirroring properties apply to all DPCs and their Packet Forwarding Engines and their associated ports.
2. For a DPC bound to a named port-mirroring instance, configured by including the port-mirror-instance pm-instance-name statement at the [edit chassis fpc slot-number] hierarchy level, the FPC-level port mirroring properties apply to all Packet Forwarding Engines (and their associated ports) on the DPC and override the properties of the global port-mirroring instance (if the port-mirroring statement has been included at the [edit forwarding-options] hierarchy level).
3. For a Packet Forwarding Engine bound to a Layer 2 port-mirroring instance (configured by including the port-mirror-instance pm-instance-name-b statement at the [edit chassis fpc slot-number pic slot-number] hierarchy level), the PIC-level port-mirroring properties apply to all ports associated with the Packet Forwarding Engine and override the properties bound to the DPC (if the port-mirror-instance pm-instance-name-a statement has been included at the [edit chassis fpc slot-number] hierarchy level).

For more information about configuring port mirroring for Layer 2 VPLS traffic, see the JUNOS MX-series Layer 2 Configuration Guide.

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