does anyone know if using a vlan is any slower than not? wondering if tagging the packets causes any additional load or slowdown versus untagged vlans (vlan 1?). Im talking about noticibility with 1gbps of traffic and high pps (under ddos type situation maybe)
As I understand tagging has to be done by cpu. So some additional cpu cycles have to be done per packet. May be not notable using big packets. With a lot of small packets you should see it.
If you need Gigabit performance I would offload the tagging to a switch.
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thank you - that was me gut feeling but wanted to ask others.