Dell MX5108n OS10 Enterprise Edition User Guide for PowerEdge MX IO Modules Re - Page 172

Link aggregation control protocol Group Ethernet interfaces to form a single link layer interface called a LAG or port-channel. Aggregating multiple links between physical interfaces creates a single logical LAG, which balances traffic across the member links within an aggregated Ethernet bundle and increases the uplink bandwidth. If one member link fails, the LAG continues to carry traffic over the remaining links. You can use LACP to create dynamic LAGs exchanging information between two systems (also called Partner Systems) and automatically establishing the LAG between the systems. LACP permits the exchange of messages on a link to: • Reach an agreement on the identity of the LAG to which the link belongs. • Move the link to that LAG. • Enable the transmission and reception functions. LACP functions by constantly exchanging custom MAC PDUs across LAN Ethernet links. The protocol only exchanges packets between ports you configure as LACP-capable. Modes A LAG includes three configuration modes - on, active, and passive. On Active Passive Sets the Channeling mode to Static. The interface acts as a member of the static LAG. Sets the interface in the Active Negotiating state. LACP runs on any link configured in this mode. A port in Active mode automatically initiates negotiations with other ports by using LACP packets. A port in Active mode can set up a port-channel (LAG) with another port in Active mode or Passive mode. Sets the interface in an Inactive Negotiating state, but LACP runs on the link. A port in Passive mode also responds to negotiation requests (from ports in Active mode). Ports in Passive mode respond to LACP packets. A port in Passive mode cannot set up a LAG with another port in Passive mode. • There is no dual-membership in static and dynamic LAGs: - If a physical interface is a part of a static LAG, the channel-group id mode active command is rejected on that interface. - If a physical interface is a part of a dynamic LAG, the channel-group id command is rejected on that interface. • You cannot add static and dynamic members to the same LAG. • There is a difference between the shutdown and no interface port-channel commands: - The shutdown command on LAG xyz disables the LAG and retains the user commands. - The no interface port-channel channel-number command deletes the specified LAG, including a dynamically created LAG. The interfaces restore and are ready for configuration. • A maximum of 128 port-channels with up to 16 members per channel are allowed. Configuration LACP is enabled globally by default. You can configure aggregated ports with compatible active and passive LACP modes to automatically link them. 1 Configure the system priority in CONFIGURATION mode (1 to 65535; the higher the number, the lower the priority; default 32768). lacp system-priority priority-value 2 Configure the LACP port priority in INTERFACE mode (1 to 65535; the higher the number, the lower the priority; default 32768). lacp port-priority priority-value 3 Configure the LACP rate in INTERFACE mode (default normal). lacp rate [fast | normal] 172 Layer 2