Q-in-Q support on redundant trunk links using LAGs with link protection

You can configure redundant trunk links on LAGs in a service-provider configuration. In a service-provider network, redundant trunk links provide a simple solution for network recovery when a trunk port on a switch goes down. In that case, traffic is routed to another trunk port, keeping network convergence time to a minimum. Redundant trunk links on a LAG-service-provider-style configurations-include support for the following items that are not supported on enterprise-style redundant trunk link configurations: 

• Configuration of flexible VLAN tagging (that is, a service-provider style configuration) on the same LAG that supports the redundant links configurations 
• Multiple redundant-link configurations on one physical interface 
• Multicast convergence