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Alteon OS Application Guide
246
Appendix A: Troubleshooting 42C4911, January 2007
Monitoring Ports
The port mirroring feature in the Alteon OS allows you to attach a sniffer to a monitoring port
that is configured to receive a copy of all packets that are forwarded from the mirrored port.
Alteon OS enables you to mirror port traffic for all layer 2 and layer 3. Port mirroring can be
used as a troubleshooting tool or to enhance the security of your network. For example, an IDS
server can be connected to the monitor port to detect intruders attacking the network.
As shown in Figure A-1, port EXT3 is monitoring ingress traffic (traffic entering the switch)
on port EXT1 and egress traffic (traffic leaving the switch) on port EXT2. You can attach a
device to port EXT3 to monitor the traffic on ports EXT1 and EXT2.
Figure A-1 Monitoring Ports
Figure A-1 shows two mirrored ports monitored by a single port. Similarly, you can have a sin-
gle or groups of:
one mirrored port to one monitored port
more than two mirrored ports to one monitored port
Alteon OS does not support a single port being monitored by multiple ports.
Ingress and egress traffic is duplicated and sent to the monitor port after processing.
NOTE – The GbESM cannot mirror LACPDU packets.
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RS 232
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Monitoring port
Mirrored ports
Ingress
Egress