OMCR
Oversubscribed Multi-Chassis Redundancy
Warm-Standby Node or Protecting Node
Refers to the oversubscribed node that offers the protection of subscriber hosts spread over multiple BNGs. During the normal operation, the protecting node maintains the subscriber host in the form of an MCS record (Multi-Chassis Synchronization Record) in the control plane. Only when the failure occurs and the protecting node becomes active, are the subscriber-hosts fully instantiated in the data and control plane. This node is sometimes referred to as N:1 node.
Active/Active (1:1) Model
This mode of operation refers to the model where subscribers host are fully synchronized between two chassis, regardless of the state of the underlying SRRP instance (Master/Standby). Each node can have MCS peering sessions with four other nodes where each peering session represent 1 to 1 mapping set of active subscriber hosts.