I want to know that Cisco always start every thing with âZEROâ but Cisco make default VLAN 1, why is not VLAN0 âZEROâ?
Is there any logic or standard? Please let me know.
In 802.1q, a vlan value of 0 means that the frame does not belong to any vlan. Vlan 1 is the first usable vlan. That's why Cisco is using it.
Cisco IPphone learn the voice vlan configured on the switch by cdp, it's not using vlan 0