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Implementing and Operating Cisco Enterprise Network Core Technologies (ENCOR) · Cisco
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I've often wondered why a regular VLAN couldn't be used for RSPAN transport and I could never find any info that clearly stated why. I've done it without configuring the VLAN transport for RSPAN. I believe though is that an RSPAN VLAN has all the usual VLAN control frames suppressed such as BDUs, DTP, VTP, etc so that only the captures are sent through.
Configuring RSPAN requires a few more steps. You have to configure a dedicated RSPAN VLAN on both the source and destination switches, like so: vlan 3333 name RSPAN remote-span
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