Monitoring Vlans, On - Cisco Catalist 3850 Series Configuring Network Settings

Vlan

Configuring VLANs

• For VTP version 1 or 2, you can set the VTP mode to transparent in global configuration mode. You

should save this configuration to the startup configuration so that the switch boots up in VTP transparent

mode. Otherwise, you lose the extended-range VLAN configuration if the switch resets. If you create

extended-range VLANs in VTP version 3, you cannot convert to VTP version 1 or 2.

• STP is enabled by default on extended-range VLANs, but you can disable it by using the no spanning-tree

vlan vlan-id global configuration command. When the maximum number of spanning-tree instances

are on the switch, spanning tree is disabled on any newly created VLANs. If the number of VLANs on

the switch exceeds the maximum number of spanning-tree instances, we recommend that you configure

the IEEE 802.1s Multiple STP (MSTP) on your switch to map multiple VLANs to a single spanning-tree

instance.

• The number of routed ports, SVIs, and other configured features affects the use of the switch hardware.

If you try to create an extended-range VLAN and there are not enough hardware resources available,

an error message is generated, and the extended-range VLAN is rejected.

• In a switch stack, the whole stack uses the same running configuration and saved configuration, and

extended-range VLAN information is shared across the stack.

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