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Configuring IEEE 802.1Q Tunneling
52-13
52
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.
General Configuration Guidelines for QinQ
1. Configure the switch to QinQ mode (dot1q-tunnel system-tunnel-control,
page 52-14).
2. Create a SPVLAN (vlan, page 52-6).
3. Configure the QinQ tunnel access port to dot1Q-tunnel access mode
(switchport dot1q-tunnel mode, page 52-14).
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, page 52-15.)
5. Configure the QinQ tunnel access port to join the SPVLAN as an untagged
member (switchport allowed vlan, page 52-11).
6. Configure the SPVLAN ID as the native VID on the QinQ tunnel access port
(switchport native vlan, page 52-10).
7. Configure the QinQ tunnel uplink port to dot1Q-tunnel uplink mode (switchport
dot1q-tunnel mode, page 52-14).
8. Configure the QinQ tunnel uplink port to join the SPVLAN as a tagged member
(switchport allowed vlan, page 52-11).
Table 52-1 IEEE 802.1Q Tunneling Commands
Command Function Mode Page
dot1q-tunnel
system-tunnel-control
Configures the switch to operate in normal mode or QinQ
mode
GC 52-14
switchport dot1q-tunnel
mode
Configures an interface as a QinQ tunnel port IC 52-14
switchport dot1q-tunnel tpid Sets the Tag Protocol Identifier (TPID) value of a tunnel port IC 52-15
show dot1q-tunnel Displays the configuration of QinQ tunnel ports PE 52-16
show interfaces switchport Displays port QinQ operational status PE 45-10