Acopia Adaptive Resource Switch, Cli Maintenance Manual

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Troubleshooting Network Connections
Configuring Port Mirroring
7-28 CLI Maintenance Guide
Configuring Port Mirroring
You can also monitor all of the traffic on a specific port, using an external packet
analyzer.
Port mirroring captures all packets going through designated source
interface(s) and copies them to the “MIRROR” interface. A network analyzer at the
“MIRROR” interface can therefore see all traffic going through the source
interface(s) in real time.
Port mirroring is not supported on the ARX®500.
From cfg mode, use the
monitor system
command to monitor one source interface:
monitor system source-interface slot / port {rx | tx | both}
where
slot / port is the source port (for example, “3/3” on an ARX®6000 or “1/3” on
an ARX®1000). Use the
show interface summary
command to find all ports
configured on the ARX.
{rx | tx | both} chooses the direction of monitored packets. Choose rx for
received (ingress) packets, tx for transmit (egress) packets, or both .
A notice appears, cautioning you against excessive traffic through the MIRROR port
(similar to the Caution above). Enter
yes to continue.
For example, the following command sequence shows all port numbers and then
monitors the receive packets on port 3/1:
bstnA6k(cfg)# show interface summary
Oversubscription of the destination monitor port during port mirroring can result in a
service interruption. Proceed only upon the advice from Acopia Technical Support.
Remember to shut off port mirroring after you have finished diagnosing your problem.
Port mirroring slows the source interface(s) with numerous packet selection, duplication,
and forwarding operations.
Monitor sessions do not persist across reboots.