Cisco Catalyst 3650 series Command Reference Manual page 1077

You can add extended-range VLANs to the allowed VLAN list, but not to the
Note
pruning-eligible VLAN list.
Separate nonconsecutive VLAN IDs with a comma; use a hyphen to designate a range of IDs.
• remove removes the defined list of VLANs from those currently set instead of replacing the list. Valid
IDs are from 1 to 1005; extended-range VLAN IDs are valid in some cases.
Note You can remove extended-range VLANs from the allowed VLAN list, but you cannot
remove them from the pruning-eligible list.
• except lists the VLANs that should be calculated by inverting the defined list of VLANs. (VLANs are
added except the ones specified.) Valid IDs are from 1 to 1005. Separate nonconsecutive VLAN IDs
with a comma; use a hyphen to designate a range of IDs.
• vlan-atom is either a single VLAN number from 1 to 4094 or a continuous range of VLANs described
by two VLAN numbers, the lesser one first, separated by a hyphen.
Native VLANs:
• All untagged traffic received on an IEEE 802.1Q trunk port is forwarded with the native VLAN configured
for the port.
• If a packet has a VLAN ID that is the same as the sending-port native VLAN ID, the packet is sent
without a tag; otherwise, the switch sends the packet with a tag.
• The no form of the native vlan command resets the native mode VLAN to the appropriate default VLAN
for the device.
Allowed VLAN:
• To reduce the risk of spanning-tree loops or storms, you can disable VLAN 1 on any individual VLAN
trunk port by removing VLAN 1 from the allowed list. 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.
• The no form of the allowed vlan command resets the list to the default list, which allows all VLANs.
Trunk pruning:
• The pruning-eligible list applies only to trunk ports.
• Each trunk port has its own eligibility list.
• If you do not want a VLAN to be pruned, remove it from the pruning-eligible list. VLANs that are
pruning-ineligible receive flooded traffic.
• VLAN 1, VLANs 1002 to 1005, and extended-range VLANs (VLANs 1006 to 4094) cannot be pruned.
Command Reference, Cisco IOS XE Everest 16.5.1a (Catalyst 3650 Switches)
switchport trunk
1051