Edge-Core ES3528-WDM

VLAN Commands
30-20
30
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 19-8).
2. Create a SPVLAN (vlan, page 30-7).
3. Configure the QinQ tunnel port to dot1Q tunnel port mode (switchport mode
dot1q-tunnel, page 30-21).
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 30-22.)
5. Configure the QinQ tunnel port to join the SPVLAN as an untagged member
(switchport allowed vlan, page 30-11).
6. Configure the SPVLAN ID as the native VID on the QinQ tunnel port
(switchport native vlan, page 30-11).
7. Configure system MTU to 1526 if jumbo frames are not enabled (see “System
MTU Commands” on page 19-9).
8. Configure the QinQ uplink port to join the SPVLAN as a tagged member
(switchport allowed vlan, page 30-11).
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 19-8
show system mode Displays the switch’s system mode GC 19-9
switchport mode
dot1q-tunnel
Configures an interface as a QinQ tunnel port IC 30-21
show dot1q-tunnel Displays information about QinQ tunnel ports PE 30-21
switchport dot1q-ethertype Sets the Tag Protocol Identifier (TPID) value of a tunnel port IC 30-22
system mtu Sets the maximum transfer unit for the switch GC 19-11
show system mtu Shows the maximum transfer unit size for Fast Ethernet
and Gigabit Ethernet ports
GC 19-11