SMC Networks SMC TigerAccess SMC7824M/FSW - Manual (Page 640)

VLAN C
OMMANDS
30-24
Configuring 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 (system mode, page 19-10).
2. Create a SPVLAN (vlan, page 30-8).
3. Configure the QinQ tunnel port to dot1Q tunnel port mode
(switchport mode dot1q-tunnel, page 30-25).
4. Set the Tag Protocol Identifier (TPID) value of the tunnel port. This
step is required if the attached client is using a nonstandard 2-byte
Table 30-8 IEEE 802.1Q Tunneling Commands
Command Function Mode Page
system mode Configures the switch to operate in normal
mode or QinQ mode GC 19-10
show system mode Displays the switch’s system mode GC 19-11
switchport mode
dot1q-tunnel Configures an interface as a QinQ tunnel
port IC 30-25
show dot1q-tunnel Displays information about QinQ tunnel
ports PE 30-26
switchport
dot1q-ethertype Sets the Tag Protocol Identifier (TPID)
value of a tunnel port IC 30-27
system mtu Sets the maximum transfer unit for the
switch GC 19-13
show system mtu Shows the maximum transfer unit size for
Fast Ethernet and Gigabit Ethernet ports GC 19-14