HP AA979A - StorageWorks SAN Switch 2/8V, Administrator'S Manual, Page: 316 / 465

328 Troubleshooting
Supported hardware
Port mirroring is supported on Condor-based ASIC platforms, including:
• SAN Switch 4/32
• SAN Switch 4/32B
• 4/64 SAN Switch
• 400 MP Router
• 4/256 SAN Director with chassis option 5
Port mirroring can be used on the following blades within a chassis:
• FC4-32 32-port blade
• FC4-16 16-port blade
• FC4-48 48-port blade
• FR4-18i routing & FCIP blade
• FC4-16IP iSCSI blade on FC ports only
The FC4-48 implements port pairing, meaning that two ports share the same area. Port pairing uses a
single area to map to two physical ports. A frame destined to the secondary port is routed to the
primary port. The primary port's filtering zone engine is used to redirect the frame to the secondary
port. Port mirroring uses the port filter zone engine to redirect the frames to the mirror port. If two
F_Ports share the same area, both ports cannot be part of a mirror connection. One of the two ports
can be part of the connection as long as the other port is offline. Supported port configurations are
shown in Table 71 .
If IOD is enabled, adding or deleting a port mirror connection causes a frame drop. Port mirroring
reroutes a given connection to the mirror port, where the mirror traffic takes an extra route to the mirror
port. When the extra route is removed, the frames between the two ports goes directly to the
destination port. Since the frames at the mirror port could be queued at the destination port behind
those frames that went directly to the destination port, port mirroring drops those frames from the mirror
port when a connection is disabled. If IOD has been disabled, port mirroring does not drop any frames
but displays an IOD error.
• A port cannot be mirrored to multiple locations. If you define multiple mirror connections for the same
F_Port, all the connections must share the same mirror port.
• Local switches cannot be mirrored because FICON CUP frames to a local switch are treated as
well-known addresses or embedded frame traffic.
• Using firmware download to downgrade to previous Fabric OS releases that do not support port
mirroring requires that you remove all port mirroring connections. If you downgrade to a previous
versions of Fabric OS, you cannot proceed until the mirroring connections are removed.
Table 71 Port combinations for port mirroring
Primary port Secondary port Supported
F_Port F_Port No
F_Port Offline Yes
Offline F_Port Yes
F_Port E_Port Yes
E_Port F_Port Yes
E_Port E_Port No