Examples: Port Mirroring Configuration; Resource Use On Ex Series Switches - Juniper JUNOS OS 10.3 - SOFTWARE Manual

Table 481: Port Mirroring Terminology (continued)
Term
Remote port mirroring
Statistical sampling
Related
Documentation

Examples: Port Mirroring Configuration

Example: Configuring Port Mirroring for Local Monitoring of Employee Resource Use on EX
Series Switches
Copyright © 2010, Juniper Networks, Inc.
Description
Functions the same as local port mirroring, except that the mirrored traffic is not copied to
a local analyzer port but is flooded into an analyzer VLAN that you create specifically for
the purpose of receiving mirrored traffic.
In the intermediate switch, you can avoid flooding of the mirrored traffic to the member
ports of the VLAN by setting the "ingress only" attribute to the incoming ports of the VLAN
and the "egress only" attribute to the outgoing port of the VLAN.
You can configure the system to mirror a sampling of the packets, by setting a ratio of 1:x,
where x is a value from 1 through 2047.
For example, when the ratio is set to 1, all packets are copied to the analyzer. When the
ratio is set to 200, 1 of every 200 packets is copied.
Example: Configuring Port Mirroring for Local Monitoring of Employee Resource Use
on EX Series Switches on page 3543
Example: Configuring Port Mirroring for Remote Monitoring of Employee Resource Use
on EX Series Switches on page 3549
Configuring Port Mirroring to Analyze Traffic (J-Web Procedure) on page 3558 or
Configuring Port Mirroring to Analyze Traffic (CLI Procedure) on page 3555
Firewall Filter Match Conditions and Actions for EX Series Switches on page 3009
Example: Configuring Port Mirroring for Local Monitoring of Employee Resource Use
on EX Series Switches on page 3543
Example: Configuring Port Mirroring for Remote Monitoring of Employee Resource Use
on EX Series Switches on page 3549
EX Series switches allow you to configure port mirroring to send copies of 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 EX2200, EX3200, EX4200, or EX4500 switches
Packets exiting a VLAN on EX8200 switches
You can analyze the mirrored traffic using a protocol analyzer application installed on a
system connected to the local destination interface (or a running on a remote monitoring
station if you are sending mirrored traffic to an analyzer VLAN).
Chapter 127: Port Mirroring
3543