CHAPTER 127
Port Mirroring
•
Port Mirroring—Overview on page 3539
•
Examples: Port Mirroring Configuration on page 3543
•
Configuring Port Mirroring on page 3555
•
Verifying Port Mirroring Configuration on page 3560
•
Configuration Statements for Port Mirroring on page 3561
•
Operational Mode Commands for Port Mirroring on page 3574
Port Mirroring—Overview
•
Understanding Port Mirroring on EX Series Switches on page 3539
Understanding Port Mirroring on EX Series Switches
Use port mirroring to facilitate analyzing traffic on your Juniper Networks EX Series
Ethernet Switch on a packet level. Use port mirroring as part of monitoring switch traffic
for such purposes as enforcing policies concerning network usage and file sharing, and
identifying sources of problems on your network by locating abnormal or heavy bandwidth
usage from particular stations or applications.
Port mirroring copies packets to either a local interface for local monitoring or to a VLAN
for remote monitoring. You can use port mirroring to copy these packets:
•
Packets entering or exiting a port
•
Packets entering a VLAN on Juniper Networks EX2200, EX3200, EX4200, or EX4500
Ethernet Switches
•
Packets exiting a VLAN on Juniper Networks EX8200 Ethernet Switches
This topic describes:
•
Port Mirroring Overview on page 3539
•
Port Mirroring Terminology on page 3542
Port Mirroring Overview
Port mirroring is needed for traffic analysis on a switch because a switch, unlike a hub,
does not broadcast packets to every port on the device. The switch sends packets only
3539
Copyright © 2010, Juniper Networks, Inc.
Summary of Contents for JUNOS OS 10.3 - SOFTWARE
Page 325: ...CHAPTER 17 Operational Mode Commands for System Setup 229 Copyright 2010 Juniper Networks Inc ...
Page 1323: ...CHAPTER 56 Operational Mode Commands for Interfaces 1227 Copyright 2010 Juniper Networks Inc ...
Page 2841: ...CHAPTER 86 Operational Commands for 802 1X 2745 Copyright 2010 Juniper Networks Inc ...
Page 3367: ...CHAPTER 113 Operational Mode Commands for CoS 3271 Copyright 2010 Juniper Networks Inc ...
Page 3435: ...CHAPTER 120 Operational Mode Commands for PoE 3339 Copyright 2010 Juniper Networks Inc ...
Page 3529: ...CHAPTER 126 Operational Mode Commands for MPLS 3433 Copyright 2010 Juniper Networks Inc ...