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User’s Manual of SGSD-1022 / SGSD-1022P
SGSW-2840 / SGSW-2840P
576
5.21.5 Configuring IEEE 802.1Q Tunneling
IEEE 802.1Q tunneling (QinQ tunneling) uses a single Service Provider VLAN (SPVLAN) for customers who have multiple
VLANs. Customer VLAN IDs are preserved and traffic from different customers is segregated within the service provider’s
network even when they use the same customer-specific VLAN IDs. QinQ tunneling expands VLAN space by using a
VLAN-in-VLAN hierarchy, preserving the customer’s original tagged packets, and adding SPVLAN tags to each frame (also
called double tagging).
This section describes commands used to configure QinQ tunneling.
Command Function Mode
dot1q-tunnelsystem-tunnel-cont
rol
Configures the switch to operate in normal mode or QinQ mode GC
switchport dot1q-tunnel mode Configures an interface as a QinQ tunnel port IC
switchport dot1q-tunnel tpid Sets the Tag Protocol Identifier (TPID) value of a tunnel port IC
show dot1q-tunnel Displays the configuration of QinQ tunnel ports PE
show interfaces switchport Displays port QinQ operational status PE
Table 5-71 IEEE 802.1Q Tunneling Commands
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
• 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.
• IGMP Snooping should not be enabled on an tunnel access port.
• 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.