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Cisco Vlan
Link to Linux vlan info linux/vlan
Q-in-Q (qinq) Vlans in vlan
- Use a vlan to Tunnel/Trunk multiple vlans between edge switches. Achieved by adding a 2nd (Metro Tag) vlan tag to already vlan tagged traffic.
- L2 protocols can also be allowed to create the illusion of one long cable. e.g. CDP, VTP, and spanning tree
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