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9-7
Cisco Nexus 7000 Series NX-OS Interfaces Configuration Guide, Release 5.x
OL-23435-03
Chapter 9 Configuring Q-in-Q VLAN Tunnels
Licensing Requirements for Q-in-Q Tunnels
Licensing Requirements for Q-in-Q Tunnels
The following table shows the licensing requirements for this feature:
Guidelines and Limitations
Q-in-Q tunnels and Layer 2 tunneling have the following configuration guidelines and limitations:
• Switches in the service-provider network must be configured to handle the increase in MTU size due
to Q-in-Q tagging.
• MAC address learning for Q-in-Q tagged packets is based on the outer VLAN (Service Provider
VLAN) tag. Packet forwarding issues may occur in deployments where a single MAC address is
used across multiple inner (customer) VLANs.
• Layer 3 and higher parameters cannot be identified in tunnel traffic (for example, Layer 3
destination and source addresses). Tunneled traffic cannot be routed.
• Cisco Nexus 7000 Series devices can provide only MAC-layer ACL/QoS for tunnel traffic (VLAN
IDs and src/dest MAC addresses).
• You should use MAC address-based frame distribution.
• Asymmetrical links do not support the Dynamic Trunking Protocol (DTP) because only one port on
the link is a trunk. You must configure the 802.1Q trunk port on an asymmetrical link to trunk
unconditionally.
• You cannot configure the 802.1Q tunneling feature on ports that are configured to support private
VLANs. Private VLAN are not required in these deployments.
• You must disable IGMP snooping on the tunnel VLANs.
• Control Plane Policing (CoPP) is not supported.
• You should run the vlan dot1Q tag native command to maintain the tagging on the native VLAN
and drop untagged traffic. This will prevent native VLAN misconfigurations,
• You must manually configure the 802.1Q interfaces to be edge ports.
• Dot1x tunneling is not supported.
• You should perform an EPLD upgrade to newer versions in order for EtherType configuration to take
effect on some Cisco Nexus devices.
Configuring Q-in-Q Tunnels and Layer 2 Protocol Tunneling
This section describes how to configure Q-in-Q tunnels and Layer 2 protocol tunneling on Cisco Nexus
7000 Series devices.
This section includes the following topics:
• Creating a 802.1Q Tunnel Port, page 9-8
Product License Requirement
Cisco NX-OS 802.1Q-in-Q VLAN tunneling and L2 protocol tunneling require no license. Any
feature not included in a license package is bundled with the Cisco NX-OS system
images and is provided at no extra charge to you. For a complete explanation of the
Cisco NX-OS licensing scheme, see the Cisco NX-OS Licensing Guide.
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