Supermicro SSE-F3548S - Page 91

Supermicro SSE-F3548S/SSE-F3548SR Configuration User’s Guide
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SMIS(config)# interface fx 0/1
SMIS(config-if)# switchport mode trunk
SMIS(config-if)# switchport trunk allowed vlan 2-20
SMIS(config-if)# exit
Configure to not to allow VLANs 30 to 50 on trunk interface fx 0/1.
SMIS# configure terminal
SMIS(config)# interface fx 0/1
SMIS(config-if)# switchport mode trunk
SMIS(config-if)# switchport trunk allowed vlan except 30-50
SMIS(config-if)# exit
3.8.2.2 Native VLAN on Trunk
All packets sent out on a trunk interface carry the 802.1Q VLAN tag header. There may be cases in which
untagged packets need to be carried over a trunk interface. This is achieved by using the native VLAN
feature of the trunk interface.
Any VLAN can be configured on any trunk interface as a native VLAN. Trunk interfaces will send native
VLAN packets as untagged packets without adding the 802.1Q VLAN tag header. Similarly, any untagged
packets received on a trunk interface will be considered to be native VLAN packets.
VLAN 1 is the default native VLAN for all trunk interfaces.
Figure VLAN-5: Native VLANs
Users can configure a native VLAN for trunk interfaces by following the steps below.
Step
Command
Description
0/1VLAN 20 &
30VLAN 20 & 30
0/40VLAN
40VLAN 40
Switch B
VLAN
20 & 30
Switch A
Native VLAN 40
VLAN
40
Trunk Links
Access Links