Remote Switched Port Analyzer
Remote Switched Port Analyzer
Unlike Local SPAN, Remote SPAN (RSPAN) allows for the SPAN
destination port to be anywhere on the Layer 2 network. This can potentially
help save time because the network engineer does not have to worry about placing
the sniffer on the same switch as the source. In fact, multiple destination
ports can be configured. A Catalyst 6500 can support up to 24 RSPAN destination
ports. Sniffers can be strategically placed so that they are readily available
if needed. A special VLAN is created for RSPAN to carry the copied source
traffic to the destination port. The traffic in RSPAN VLAN is flooded because
learning of MAC address is disabled. RSPAN VLAN does not generate bridge
protocol data units (BPDUs) on the network.
A source switch is where the monitored ports are located. A
source switch can only support one RSPAN VLAN. The steps outline has two
switches connected back to back using Inter-Switch Link (ISL) trunking. |
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