Debugging Vlan Stacking; Vlan Stacking In Multi-Vendor Networks - Dell S6100 Configuration Manual

interface TenGigabitEthernet 1/1/1/1
no ip address
portmode hybrid
switchport
vlan-stack trunk
shutdown
Dell(conf-if-te-1/1/1/1)#interface vlan 100
Dell(conf-if-vl-100)#untagged tengigabitethernet 1/1/1/1
Dell(conf-if-vl-100)#interface vlan 101
Dell(conf-if-vl-101)#tagged tengigabitethernet 1/1/1/1
Dell(conf-if-vl-101)#interface vlan 103
Dell(conf-if-vl-103)#vlan-stack compatible
Dell(conf-if-vl-103-stack)#member tengigabitethernet 1/1/1/1
Dell(conf-if-vl-103-stack)#do show vlan
Codes: * - Default VLAN, G - GVRP VLANs
Q: U - Untagged, T - Tagged
x - Dot1x untagged, X - Dot1x tagged
G - GVRP tagged, M - Vlan-stack
NUM Status Description
* 1 Inactive
100 Inactive
101 Inactive
103 Inactive

Debugging VLAN Stacking

To debug VLAN stacking, use the following command.
• Debug the internal state and membership of a VLAN and its ports.
debug member
Example of Debugging a VLAN and its Ports
The port notations are as follows:
• MT — stacked trunk
• MU — stacked access port
• T — 802.1Q trunk port
• U — 802.1Q access port
• NU — Native VLAN (untagged)
Dell# debug member vlan 603
vlan id : 603
ports : Te 1/1/2/1 (MT), Te 1/1/3/1(MU), 1/1/3/2(MT), Te 1/1/3/3(MT), Te 1/1/3/4(MU)
Dell#debug member port tengigabitethernet 1/1/2/1
vlan id : 603 (MT), 100(T), 101(NU)
Dell#

VLAN Stacking in Multi-Vendor Networks

The first field in the VLAN tag is the tag protocol identifier (TPID), which is 2 bytes. In a VLAN-stacking network, after the frame is double
tagged, the outer tag TPID must match the TPID of the next-hop system.
While 802.1Q requires that the inner tag TPID is 0x8100, it does not require a specific value for the outer tag TPID. Systems may use any 2-
byte value; Dell Networking OS uses 0x9100 (shown in the following) while non-Dell Networking systems might use a different value.
Q Ports
U Te 1/1/1/1
T Te 1/1/1/1
M Te 1/1/1/1
Service Provider Bridging 799