Mirroring of Packets Forwarded or Flooded to a VLAN
To mirror Layer 2 traffic forwarded to or flooded to a VLAN, apply a port-mirroring firewall
filter to the input to the forwarding table or flood table. Any packet received for the VLAN
forwarding or flood table and that matches the filter conditions is mirrored.
For more information about VLANs, see Understanding Layer 2 Bridge Domains . For
information about flooding behavior in a VLAN, see Understanding Layer 2 Learning and
Forwarding for Bridge Domains .
NOTE: When you configure port mirroring on any interface under one VLAN,
the mirrored packet can move to an external analyzer located under different
VLANs.
Mirroring of Packets Forwarded or Flooded to a VPLS Routing Instance
To mirror Layer 2 traffic forwarded to or flooded to a VPLS routing instance, apply a
port-mirroring firewall filter to the input to the forwarding table or flood table. Any packet
received for the VPLS routing instance forwarding or flood table and that matches the
filter condition is mirrored.
For more information about VPLS routing instances, see Configuring a VPLS Routing
Instance and Configuring VLAN Identifiers for Bridge Domains and VPLS Routing Instances.
For information about flooding behavior in VPLS, see the Junos OS VPNs Library for Routing
Devices.
Related
Documentation
Understanding Layer 2 Port Mirroring on page 3•
• Defining a Layer 2 Port-Mirroring Firewall Filter
• Example: Layer 2 Port Mirroring at a Logical Interface
• Example: Layer 2 Port Mirroring for a Layer 2 VPN
• Example: Layer 2 Port Mirroring for a Layer 2 VPN with LAG Links
• Example: Layer 2 Port Mirroring to Multiple Destinations
67Copyright © 2016, Juniper Networks, Inc.
Chapter 8: Port Mirroring for Multiple Destinations
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