Reference Guide

● 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 Sets the Channeling mode to Static. The interface acts as a member of the static LAG.
Active 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.
Passive 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]
Configure LACP
OS10(config)# lacp system-priority 65535
OS10(config)# interface range ethernet 1/1/7-1/1/8
OS10(conf-range-eth1/1/7-1/1/8)# lacp port-priority 4096
OS10(conf-range-eth1/1/7-1/1/8)# lacp rate fast
Verify LACP configuration
OS10(conf-range-eth1/1/7-1/1/8)# do show running-configuration
...
!
interface ethernet1/1/7
156
Layer 2