Juniper EX9200 Features Guide

Layer 2 Port Mirroring of PE Router or PE Switch Aggregated Ethernet Interfaces
An aggregated Ethernet interface is a virtual aggregated link that consists of a set of
physical interfaces of the same speed and operating in full-duplex link connection mode.
You can configure aggregated Ethernet interfaces between CE devices and PE devices
for VPLS routing instances. Traffic is load-balanced across all of the links in the aggregated
interface. If one or more links in the aggregated interface fails, the traffic is switched to
the remaining links.
You can apply a Layer 2 port-mirroring firewall filter to an aggregated Ethernet interface
to configure port mirroring at the parent interface. However, if any child interfaces are
bound to different Layer 2 port-mirroring instances, packets received at the child interfaces
will be mirrored to the destinations specified by their respective port-mirroring instances.
Thus, multiple child interfaces can mirror packets to multiple destinations.
For example, suppose the parent aggregated Ethernet interface instance ae0 has two
child interfaces:
•
xe-2/0/0
•
xe-3/1/2
Suppose that these child interfaces on ae0 are bound to two different Layer 2
port-mirroring instances:
•
pm_instance_A—A named instance of Layer 2 port mirroring, bound to child interface
xe-2/0/0.
•
pm_instance_B—A named instance of Layer 2 port mirroring, bound to child interface
xe-3/1/2.
Now suppose you apply a Layer 2 port-mirroring firewall filter to the Layer 2 traffic sent
on ae0.0 (logical unit 0 on the aggregated Ethernet interface instance 0). This enables
port mirroring on ae0.0, which has the following effect on the processing of traffic received
on the child interfaces for which Layer 2 port-mirroring properties are specified:
•
The packets received on xe-2/0/0.0 are mirrored to the output interfaces configured
in port-mirroring instance pm_instance_A.
•
The packets received on xe-3/1/2.0 are mirrored to the output interfaces configured
in port-mirroring instance pm_instance_B.
Because pm_instance_A and pm_instance_B can specify different packet-selection
properties or mirror destination properties, the packets received on xe-2/0/0.0 and
xe-3/1/2.0 can mirror different packets to different destinations.
Related
Documentation
• Understanding Layer 2 Port Mirroring on page 3
• Layer 2 Port Mirroring Firewall Filters
• Defining a Layer 2 Port-Mirroring Firewall Filter
• Example: Layer 2 Port Mirroring for a Layer 2 VPN
15Copyright © 2016, Juniper Networks, Inc.
Chapter 3: Behavior of Layer 2 Port Mirroring of Logical Interfaces on PE Routers

Juniper EX9200 Specifications

General

Brand	Juniper
Model	EX9200
Category	Network Router
Language	English