SMC Networks TigerAccess SMC7816M - Manual (Page 833)

C
ONFIGURING
IEEE 802.1Q T
UNNELING
32-25
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 20-13).
2. Create a SPVLAN (vlan, page 32-8).
3. Configure the QinQ tunnel port to dot1Q tunnel port mode
(switchport mode dot1q-tunnel, page 32-27).
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
ethertype to identify 802.1Q tagged frames. The standard ethertype
value is 0x8100. (See switchport dot1q-ethertype, page 32-29.)
Table 32-8 IEEE 802.1Q Tunneling Commands
Command Function Mode Page
system mode Configures the switch to operate in normal
mode or QinQ mode GC 20-13
show system mode Displays the switch’s system mode GC 20-14
qinq priority map Copies the priority bits from the inner
VLAN tag to the outer VLAN tag GC 32-26
switchport mode
dot1q-tunnel Configures an interface as a QinQ tunnel
port IC 32-27
show dot1q-tunnel Displays information about QinQ tunnel
ports PE 32-28
switchport
dot1q-ethertype Sets the Tag Protocol Identifier (TPID)
value of a tunnel port IC 32-29