Service Manual

interface GigabitEthernet 1/1
no ip address
portmode hybrid
switchport
vlan-stack trunk
shutdown
Dell(conf-if-gi-1/1)#interface vlan 100
Dell(conf-if-vl-100)#untagged gigabitethernet 1/1
Dell(conf-if-vl-100)#interface vlan 101
Dell(conf-if-vl-101)#tagged gigabitethernet 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 gigabitethernet 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 Q Ports
* 1 Inactive
100 Inactive U Gi 1/1
101 Inactive T Gi 1/1
103 Inactive M Gi 1/1
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 : Gi 2/4 (MT), Gi 3/1(MU), Gi 3/25(MT), Gi 3/26(MT), Gi 3/27(MU)
Dell#debug member port gigabitethernet 2/4
vlan id : 603 (MT), 100(T), 101(NU)
Dell#
VLAN Stacking in Multi-Vendor Networks
The rst eld in the VLAN tag is the tag protocol identier (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 specic 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 dierent
value.
If the next-hop system’s TPID does not match the outer-tag TPID of the incoming frame, the system drops the frame. For example,
as shown in the following, the frame originating from Building A is tagged VLAN RED, and then double-tagged VLAN PURPLE on
egress at R4. The TPID on the outer tag is 0x9100. R2’s TPID must also be 0x9100, and it is, so R2 forwards the frame.
Service Provider Bridging
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