Preserving 802.1Q Vlan Tag Value For Lite Subinterfaces - Dell C9000 Series Networking Configuration Manual

protocol lldp
no shutdown
!
interface TenGigabitEthernet 0/18
Description SOFS-RDMA
no ip address
mtu 12000
portmode hybrid
switchport
no spanning-tree
dcb-map RoCE
!
protocol lldp
no shutdown
!
interface TenGigabitEthernet 0/22
Description SOFS- iSCSI
no ip address
mtu 12000
portmode hybrid
switchport
spanning-tree rstp edge-port
spanning-tree 0 portfast
dcb-map iSCSI
!
protocol lldp
no shutdown
Preserving 802.1Q VLAN Tag Value for
Lite Subinterfaces
All the frames in a Layer 2 VLAN are identified using a tag defined in the IEEE 802.1Q standard to determine
the VLAN to which the frames or traffic are relevant or associated. Such frames are encapsulated with the
802.1Q tags. If a single VLAN is configured in a network topology, all the traffic packets contain the same
do1q tag, which is the tag value of the 802.1Q header. If a VLAN is split into multiple, different sub-VLANs,
each VLAN is denoted by a unique 8021.Q tag to enable the nodes that receive the traffic frames determine
the VLAN for which the frames are destined.
Typically, a Layer 3 physical interface processes only untagged or priority-tagged packets. Tagged packets
that are received on Layer 3 physical interfaces are dropped. To enable the routing of tagged packets, the
port that receives such tagged packets needs to be configured as a switchport and must be bound to a VLAN
as a tagged member port.
A lite subinterface is similar to a normal Layer 3 physical interface, except that additional provisioning is
performed to set the VLAN ID for encapsulation.
A physical interface or a Layer 3 Port channel interface can be configured as a lite subinterface. Once a lite
subinterface is configured, only tagged IP packets with encapsulation VLAN ID are processed and routed. All
other data packets are discarded except the Layer 2 and Layer 3 control frames. It is not required for a VLAN
ID to be preserved (in the hardware or the OS application) when a VLAN ID, used for encapsulation, is
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