1-2priority and MAC address of this system, priority, number and operation key of the port. Upon receivingthe information, the peer compares the information with the information of other ports on the peerdevice to determine the ports that can be aggregated. In this way, the two parties can reach anagreement in added/removed to/from a dynamic aggregation group.2) Extended LACP functionBy using expansion fields in LACPDUs, you can expand the functions of LACP. For example, bydefining a new Type/Length/Value (TLV) data field among the expansion fields of the LACPDUs, youcan deliver the LACP multi-active detection (MAD) mechanism in an Intelligent Resilient Framework(IRF) stack.z S5600 series that support extended LACP functions can be used as an IRF member device or anintermediate device in LACP MAD implementation.z For details about IRF, member devices, intermediate devices, and the LACP MAD mechanism, seethe IRF Fabric operation.Operational KeyWhen aggregating ports, link aggregation control automatically assigns each port an operational keybased on the port speed, duplex mode, and basic configurations described in ConsistencyConsiderations for the Ports in Aggregation.z In a manual or static link aggregation group, the selected ports are assigned the same operationalkey.z In a dynamic link aggregation group, all member ports are assigned the same operational key.Consistency Considerations for the Ports in AggregationTo participate in traffic sharing, member ports in an aggregation group must use the sameconfigurations with respect to STP, QoS, GVRP, QinQ, VLAN, port attributes and so on as shown in thefollowing table.Table 1-1 Consistency considerations for ports in an aggregationCategory ConsiderationsSTPState of port-level STP (enabled or disabled)Attribute of the link (point-to-point or otherwise) connected to the portPort path costSTP prioritySTP packet formatLoop protectionRoot protectionPort type (whether the port is an edge port)
