When Ethernet tunnel is configured on two member ports located on different IOMs, the SAP queues and virtual schedulers are created with the actual parameters on each IOM.
The protection mode '8031-1to1' (default) activates only the primary path at any point in time, guaranteeing the use of the needed QoS resources.
Ethernet tunnel CC messages transmitted over the SAP queues using the default egress QoS policy use NC (network class) as a forwarding class. If user traffic is assigned to the NC forwarding class, it competes for the same bandwidth resources with the Ethernet CCMs. As CCM loss could lead to unnecessary bouncing of the Ethernet tunnel, congestion of the queues associated with the NC traffic should be avoided. The operator must configure different QoS Policies to avoid congestion for the CCM forwarding class by controlling the amount of traffic assigned into the corresponding queue.