Information About Port Channels
Port channels provide a mechanism for combining individual links into a group to create a single logical link that provides the aggregate bandwidth of up to eight physical links. Port channels provide increased bandwidth and redundancy and balance the traffic load between the members port. If a member port within a port channel fails, traffic previously carried over the failed port switches to the remaining member ports.
Port channels can be configured using static mode (no protocol) or the Link Access Control Protocol (LACP). Any configuration changes that you apply to the port channel are applied to each member port of the port channel. A port channel must have at least two ports. A port channel can be added to a bridge. A bond is created when a port channel has more than two members and the port channel is added to a bridge.
A port can be a member of only one port channel. All the ports in a port channel must be compatible; they must use the same speed and operate in full-duplex mode.
Port Channels Bond Mode
A port channel can be configured for the following bond modes:
active-backup : In this mode, one of the ports in the aggregated link is active and all others ports are in the standby mode.
balance-slb : In this mode, load balancing of traffic is done based on the source MAC address and VLAN.
balance-tcp : In this mode, 5-tuple (source and destination IP, source and destination port, protocol) is used to balance traffic across the ports in an aggregated link.
Port Channels LACP Mode
A port channel can be configured for the following LACP modes:
off : Indicates that no mode is applicable.
active : Indicates that the port initiates transmission of LACP packets.
passive : Indicates that the port only responds to the LACP packets that it receives but does not initiate the LACP negotiation.