Configuration Limitations for QinQ
• The native VLAN of uplink ports should not be used as the SPVLAN. If the SPVLAN
is the uplink port's native VLAN, the uplink po rt must be an unta gged memb er of
the SPVLAN. Then the outer SPVLAN tag will be stripped when the packets are
sent out. Another reason is that it causes non-customer pac kets to be forwa rded
to the SPVLAN.
• Static trunk port groups are compatible with QinQ tunnel ports as long as the Qin Q
configuration is consistent within a trunk port group.
• The native VLAN (VLAN 1) is not normally added to transmitted frames. Avoi d
using VLAN 1 as an SPVLAN tag for customer t raffic t o reduce the r isk of
misconfiguration. Instead, use VLAN 1 as a management VLAN instead of a data
VLAN in the service provider network.
• There are some inherent inc om pat ibili tie s betwe en La yer 2 and La yer 3 sw itch ing:
- Tunnel ports do not support IP Access Control Lists .
- Layer 3 Quality of Service (QoS) and other QoS featu res cont aining Layer 3
information are not supported on tunnel ports.
- Spanning tree bridge protocol data unit (BPDU) filtering is automatically disabled
on a tunnel port.
General Configuration Guidelines for QinQ
1. Configure the switch to QinQ mo de ( see “En abli ng Qin Q Tun neli ng o n the
Switch” on page 11-16).
2. 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 t o identify
802.1Q tagged frames. The default ethertype value is 0x8100. (See “Adding an
Interface to a QinQ Tunnel” on page 11-17.)
3. Create a Service Provider VLAN, also referred to as an SP VLAN (see “Crea ting
VLANs” on page 11-6).
4. Configure the QinQ tunnel access port to 802.1Q Tunnel mod e (see “Add ing an
Interface to a QinQ Tunnel” on page 11-17).
5. Configure the QinQ tunnel access port to join the SPVLA N as an untag ged
member (see “Adding Static Members to VLANs (VLAN Index)” on page 11-7).
6. Configure the SPVLAN ID as the native VID on the Q inQ tu nne l ac ces s po rt (s ee
“Configuring VLAN Behavior for Interfaces” on page 11-10).
7. Configure the QinQ tunnel uplink port to 802.1Q Tunn el Uplin k mode (see
“Adding an Interface to a QinQ Tunnel” on page 11-17).
8. Configure the QinQ tunnel uplink port to join the SPVLAN as a tagge d member
(see “Adding Static Members to VLANs (VLAN Index)” on page 11-7).
11-15
Configuring IEEE 802.1Q Tunneling
11