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Removing vlan 1 from trunk
I would like to know if there are any problems associated with removing VLAN 1 from all trunks. I found the following from Cisco's website:
Remove VLAN 1 from the allowed list so you can disable VLAN 1 on any individual VLAN trunk port in order to reduce the risk of spanning-tree loops or storms. When you remove VLAN 1 from a trunk port, the interface continues to send and receive management traffic, for example, Cisco Discovery Protocol (CDP), Port Aggregation Protocol (PAgP), Link Aggregation Control Protocol (LACP), Dynamic Trunking Protocol (DTP), and VLAN Trunking Protocol (VTP) in VLAN 1.
Is this true that management traffic passes even when VLAN 1 is disabled for all Cisco switches? What about other managed switches such as Dell?
Remove VLAN 1 from the allowed list so you can disable VLAN 1 on any individual VLAN trunk port in order to reduce the risk of spanning-tree loops or storms. When you remove VLAN 1 from a trunk port, the interface continues to send and receive management traffic, for example, Cisco Discovery Protocol (CDP), Port Aggregation Protocol (PAgP), Link Aggregation Control Protocol (LACP), Dynamic Trunking Protocol (DTP), and VLAN Trunking Protocol (VTP) in VLAN 1.
Is this true that management traffic passes even when VLAN 1 is disabled for all Cisco switches? What about other managed switches such as Dell?
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No, vlan's are not auto-detected. It would depend on the IP address of the device, whether software or the operating system has been set to tag the network traffic with a particular VLAN, and what the switchport's native VLAN setting is.
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Thanks.
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