Juniper Networks EX2500 - Manual (Page 100)

EX2500 Ethernet Switch Configuration Guide
86 „ Configuring Port Mirroring
Figure 15: Monitoring Ports
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
...
9 10 11 12 5 6 7 8
SP
L/A
17 18 19 20 13 14 15 16 21 22 23 24 MGMT
B
A
1 2 3 4 CON RESET
EX2500
ST-A
SYS
FAN
ST-B
2 4 7 10
Monitor Port Mirrored Traffic
Regular Switch Port Traffic
Ing
re
ss
Eg
re
ss
Ing
re
ss
Eg
re
ss
Ing
re
ss
Eg
re
ss
NOTE: Ingress and egress traffic is duplicated and sent to the monitor port after
regular switch processing is complete.