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Precedence of Multiple Levels of Layer 2 Port Mirroring on a Physical Interface
You can bind different sets of Layer 2 port mirroring properties (the global instance and one or more named instances) at various levels of an MX Series router chassis (at the chassis level, at the FPC level, or at the PIC level). Therefore, it is possible for a single group of physical interfaces to be bound to multiple Layer 2 port mirroring definitions.
If a group of ports (or, in the case of a PIC-level binding in an MX960 router, a single port) is bound to multiple Layer 2 port mirroring definitions, the router applies the Layer 2 port-mirroring properties to those ports as follows:
- Chassis-level port-mirroring properties implicitly apply to all ports in the chassis. If an MX Series router is configured with the global port-mirroring instance, those port mirroring properties apply to all ports. See Configuring the Global Instance of Layer 2 Port Mirroring.
- FPC-level port-mirroring properties override chassis-level properties. If a DPC or FPC is bound to a named instance of port mirroring, those port mirroring properties apply to all ports associated with that DPC or FPC, overriding any port mirroring properties bound at the chassis level. See Binding Layer 2 Port Mirroring to Ports Grouped at the FPC Level.
- PIC-level port-mirroring properties override FPC-level properties. If a Packet Forwarding Engine or PIC is bound to a named instance of port mirroring, those port mirroring properties apply to all ports associated with the Packet Forwarding Engine or PIC, overriding any port mirroring properties bound to those ports at the FPC level. See Binding Layer 2 Port Mirroring to Ports Grouped at the PIC Level.
