Chapter 4: Troubleshooting tools
This section describes available troubleshooting tools and their applications.
Port mirroring
Avaya Ethernet Routing Switch 4000 Series switches have a port mirroring feature that helps
you to monitor and analyze network traffic. The port mirroring feature supports both ingress
(incoming traffic) and egress (outgoing traffic) port mirroring. After port mirroring is enabled,
the ingress or egress packets of the mirrored (source) port are forwarded normally and a copy
of the packets is sent from the mirrored port to the mirroring (destination) port. Although you
can configure Avaya Ethernet Routing Switch 4000 Series to monitor both ingress and egress
traffic, some restrictions apply:
• For Xtx mode, you can only configure one port as the monitor port and one port as the
mirrored port (monitoring traffic transmitted by port X).
• For Xrx mode, you can only configure one port as the monitor port and one port as the
mirrored port (monitoring traffic received by port X).
• For XrxorXtx mode, you can only configure one port as the monitor port and one port as
the mirrored port (monitoring traffic received by port X OR transmitted by port X).
• For XrxYtx mode, you can only configure one port as the monitor port, one port for
mirroring traffic received by port X and one port for mirroring traffic transmitted by port Y
(monitoring traffic received by port X AND transmitted by port Y).
• For XrxorYtx mode, you can only configure one port as the monitor port, one port for
mirroring traffic received by port X and one port for mirroring traffic sent by port Y
(monitoring traffic received by port X OR transmitted by port Y).
• For XrxYtxorYrxXtx mode, you can only configure one port as the monitor port, one port
for mirroring traffic received/sent by port X and one port for mirroring traffic sent/received
by port Y ((traffic received by port X AND transmitted by port Y) OR (monitoring traffic
received by port Y AND transmitted by port X)).
You can also monitor traffic for specified MAC addresses.
• For Adst mode, you can only configure one port as the monitor port and destination MAC
address A. (monitoring traffic with destination MAC address A).
• For Asrc mode, you can only configure one port as the monitor port and source MAC
address A. (monitoring traffic with source MAC address A).
Troubleshooting Avaya ERS 4000 Series April 2014 25
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