Juniper EX2500 - Configuring Port Mirroring

EX2500 Ethernet Switch Configuration Guide
82  Configuring Port Mirroring
As shown in Figure 15, port 2 is acting as a monitor port, receiving mirrored traffic
from three other switch ports: ingress traffic from port 4, egress traffic from port 7,
and both ingress and egress traffic from port 10. A sniffer could be attached to port
2 in order to monitor the mirrored traffic on ports 4, 7, and 10.
Configuring Port Mirroring
To configure port mirroring for the example shown in Figure 15:
1. Specify the monitoring port, the mirroring port(s), and the port-mirror
direction.
ex2500(config)# port-mirroring monitor-port 2 mirroring-port 4 in
ex2500(config)# port-mirroring monitor-port 2 mirroring-port 7 out
ex2500(config)# port-mirroring monitor-port 2 mirroring-port 10 both
2. Enable port mirroring.
ex2500(config)# port-mirroring enable
3. View the current configuration.
ex2500# show port-mirroring
Port mirroring is enabled
Monitoring Ports Mirrored Ports
1 none
2 (4, in) (7, out) (10, both)
3 none
4 none
5 none
6 none
7 none
8 none
9 none
10 none
...
NOTE: Ingress and egress traffic is duplicated and sent to the monitor port after
regular switch processing is complete.