Junos OS, Release 16.1. For information about tunnel interfaces, see the Junos OS Network
Interfaces Library for Routing Devices.
Mirror Destination Properties
For a given packet address family, the mirror destination properties of a Layer 2
port-mirroring instance specify how the selected packets are to be sent on a particular
physical interface:
•
The physical interface on which to send the selected packets.
•
Whether filter checking is to be disabled for the mirror destination interface. By default,
filter checking is enabled on all interfaces.
NOTE: If you apply a filter to an interface that is also a Layer 2 port-mirroring
destination, a commit failure occurs unless you have disabled filter checking
for that mirror destination interface.
Mirror-Once Option
If port mirroring is enabled at both ingress and egress interfaces, you can prevent the MX
Series router and an EX Series switch from sending duplicate packets to the same
destination (which would complicate the analysis of the mirrored traffic).
NOTE: The mirror-once port-mirroring option is a global setting. The option
is independent of the packet selection properties and the packet family
type-specific mirror destination properties.
Related
Documentation
Understanding Layer 2 Port Mirroring on page 3•
• Restrictions on Layer 2 Port Mirroring
• Application of Layer 2 Port Mirroring Types
Application of Layer 2 Port Mirroring Types
You can apply different sets of Layer 2 port-mirroring properties to the VPLS packets at
different ingress or egress points of an MX Series or of an EX Series route.
Table 3 on page 6 describes the three types of Layer 2 port mirroring you can configure
on an MX Series router and EX Series switch: the global instance, named instances, and
firewall filters.
5Copyright © 2016, Juniper Networks, Inc.
Chapter 1: Introduction to Port Mirroring
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