Chapter 19
| VLAN Commands
Configuring IEEE 802.1Q Tunneling
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General Configuration Guidelines for QinQ
1. Configure the switch to QinQ mode (dot1q-tunnel system-tunnel-control).
2. Create a SPVLAN (vlan).
3. Configure the QinQ tunnel access port to dot1Q-tunnel access mode
(switchport dot1q-tunnel mode).
4. Set the Tag Protocol Identifier (TPID) value of the tunnel access port. This step is
required if the attached client is using a nonstandard 2-byte ethertype to
identify 802.1Q tagged frames. The standard ethertype value is 0x8100. (See
switchport dot1q-tunnel tpid.)
5. Configure the QinQ tunnel access port to join the SPVLAN as an untagged
member (switchport allowed vlan).
6. Configure the SPVLAN ID as the native VID on the QinQ tunnel access port
(switchport native vlan).
7. Configure the QinQ tunnel uplink port to dot1Q-tunnel uplink mode
(switchport dot1q-tunnel mode).
8. Configure the QinQ tunnel uplink port to join the SPVLAN as a tagged member
(switchport allowed vlan).
Limitations for QinQ
â—† The native VLAN for the tunnel uplink ports and tunnel access ports cannot be
the same. However, the same service VLANs can be set on both tunnel port
types.
â—† IGMP Snooping should not be enabled on a tunnel access port.
â—† If the spanning tree protocol is enabled, be aware that a tunnel access or tunnel
uplink port may
be disabled if the spanning tree structure is automatically
reconfigured to overcome
a break in the tree. It is therefore advisable to disable
spanning tree on these ports.
dot1q-tunnel system-
tunnel-control
This command sets the switch to operate in QinQ mode. Use the no form to disable
QinQ operating mode.
Syntax
[no] dot1q-tunnel system-tunnel-control
Default Setting
Disabled
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