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Alteon OS Application Guide
248
Appendix A: Troubleshooting 42C4911, January 2007
Layer 3 Port Mirroring
(Monitoring Port and Egress Port in the same GEA)
In this scenario, you observe Layer 3 port mirroring on an egress port, and both the egress port
and the monitoring port are in the same Gigabit Ethernet Aggregator (GEA) unit. To find out
which GEA unit each port resides on, use the /info/geaport command.
The monitoring port always shows a tagged packet with a VLAN ID (VID) of the egress port.
NOTE – In general, the GbESM mirrors all Layer 3 ingress packets after the packets are routed,
that is, all Layer 3 packets observed at the monitoring port have source MAC address, destina-
tion MAC address, VLAN, TTL, IP checksum changed as if they have gone through the rout-
ing process to the egress port.