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Different Port-Mirroring 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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