CHAPTER 6
Port Mirroring for Physical Interfaces
•
Precedence of Multiple Levels of Layer 2 Port Mirroring on a Physical
Interface on page 29
•
Binding Layer 2 Port Mirroring to Ports Grouped at the FPC Level on page 30
•
Binding Layer 2 Port Mirroring to Ports Grouped at the PIC Level on page 32
•
Disabling Layer 2 Port Mirroring Instances on page 33
•
Examples: Layer 2 Port Mirroring at Multiple Levels of the Chassis on page 34
•
Example: Layer 2 Port Mirroring with Multiple Instances on page 36
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 or of an EX Series
switch 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 (or switch) applies the
Layer 2 port-mirroring properties to those ports as follows:
1. Chassis-level port-mirroring properties implicitly apply to all ports in the chassis.
If an MX Series router or an EX Series switch 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.
2. 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” on page 30.
3. 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” on page 32.
29Copyright © 2016, Juniper Networks, Inc.
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