Different Port-Mirroring Properties for Different Router Interfaces

You can configure different sets of Layer 2 port-mirroring properties, known as port-mirroring instances, for different interfaces on an MX-series router:

• All ports in the chassis—The set of Layer 2 port mirroring properties configured at the [edit forwarding-options port-mirroring] hierarchy level is known as the global port-mirroring instance. If configured, these properties implicitly apply to all VPLS packets received on all ports in the router chassis. For detailed configuration information, see Layer 2 Port Mirroring for the Global Instance.
• Ports for a specific DPC or Packet Forwarding Engine—You can configure multiple, named port-mirroring instances, with each instance specifying different input sampling properties and output mirror destination properties. A named port-mirroring instance can be applied to a specific DPC to override the port-mirroring properties configured by the global port-mirroring instance. A named port-mirroring instance can also be applied to a specific Packet Forwarding Engine to override the port-mirroring properties configured for the DPC or for the global port-mirroring instance. For detailed configuration information, see Layer 2 Port Mirroring for a DPC or a Packet Forwarding Engine.
• A logical interface or a bridge domain forwarding table—You can configure a Layer 2 port-mirroring firewall filter that can be applied to a logical interface (including an aggregated Ethernet interface), the forwarding table of a bridge domain, or the flood table of a VPLS routing instance. A Layer 2 port-mirroring firewall filter uses the input sampling properties and output mirror destination properties configured in the global port-mirroring instance. In a Layer 2 port-mirroring firewall filter configuration, you can include one or more actions (under the then statement along with the port-mirror action modifier) that are to be taken on the mirrored packets. For detailed configuration information, see Layer 2 Port Mirroring for a Logical Interface, Forwarding Table, or Flood Table.

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