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Port Mirroring Diagnosing Switch Problems
page 27-12 OmniSwitch 6600 Family Network Configuration Guide April 2006
Port Mirroring
You can set up port mirroring for any pair of Ethernet ports within the same switch chassis. Ethernet ports
supporting port mirroring include 10BaseT/100BaseTX (RJ-45) and 1000BaseLX (LC) MiniGBIC
connectors. When port mirroring is enabled, the active “mirrored” port transmits and receives network
traffic normally, and the “mirroring” port receives a copy of all transmit and receive traffic to the active
port. You can connect an RMON probe or network analysis device to the mirroring port to see an exact
duplication of traffic on the mirrored port without disrupting network traffic to and from the mirrored port.
Note. A port that is part of an aggregate link cannot be mirrored.
Port mirroring runs in the Chassis Management software and is supported for Ethernet (10 Mbps), Fast
Ethernet (100 Mbps) and Gigabit Ethernet (1000 Mpbs) ports. One port mirroring session is supported per
OmniSwitch 6624, OmniSwitch 6600-P24, OmniSwitch 6600-U24, or OmniSwitch 6602-24 in a stack and
up to two port mirroring sessions are supported per OmniSwitch 6648 or OmniSwitch 6602-48 in a stack.
When a port mirroring session is configured, both the mirrored and mirroring ports are automatically
included in the same VLAN. Both ports must be identical in capacity (e.g., both ports support 10Mbps,
100Mbps or 1000Mbps) or the mirroring port must support a higher capacity than the mirrored port (e.g., a
mirrored Fast Ethernet port supports 100Mbps and a mirroring Gigabit Ethernet port supports 1000Mbps).
Note. Both the mirrored and mirroring ports must be connected and up (enabled) to start mirroring.
What Ports Can Be Mirrored?
OmniSwitch 6624, OmniSwitch 6600-P24, and OmniSwitch 6602-24 switches support mirroring between
any 10/100 port to any other 10/100 port. OmniSwitch 6600-U24 switches support mirroring between any
100 Mbps port to any other 100 Mbps port. Gigabit ports can also be mirrored between ports in a slot.
OmniSwitch 6648 and OmniSwitch 6602-48 switches support mirroring between any 10/100 port on the
same ASIC as another 10/100 port (i.e, ports 1-24 can mirror each other, and ports 25-48 can mirror each
other, but port 1 cannot mirror port 25, and vice versa). Gigabit ports on the OmniSwitch 6648 and the
OmniSwitch 6602-48 mirror the same as the OmniSwitch 6624.