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QinQ (Provider Bridging)
Effects of QinQ on Other Switch Features
Stacking In QinQ mixed vlan mode:
• Stacking is only supported on C-VLANs. The device does not advertise
itself (using the stack discovery protocol) in the S-VLAN space.
In QinQ svlan mode:
• Stacking discovery protocol frames will not be sent out of
customer-network ports; similarly, any stacking discovery protocol
frames received on customer-network ports will be dropped.
UDLD In QinQ mixed vlan or svlan modes:
• UDLD frames received on udld-disabled customer network ports will
be dropped. However, if the customer-network port is udld-enabled, it
can peer with a customer device.
• UDLD frames received on udld-disabled provider network ports will be
reforwarded out of other udld-disabled provider network ports on the
same VLAN.
• UDLD reforwarding in the C-VLAN space (QinQ disabled or mixed vlan
mode) will remain unaltered.
udp-bcast- In QinQ svlan mode:
forward
• udp-bcast-forward is NOT supported on provider core devices.
unknown-vlans In QinQ mixed vlan mode:
• GVRP (learn and disabled modes) not supported on S-VLAN ports.
• A C-VLAN port that has GVRP enabled will need to disable it before it
can be added to S-VLANs.
Voice VLANs In QinQ mixed vlan mode:
• S-VLANs cannot be configured as voice-VLANs.
VRRP In QinQ mixed vlan or svlan modes:
• VRRP is NOT supported on S-VLANs.
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