Connectivity Guide

LACP functions by constantly exchanging custom MAC PDUs across LAN Ethernet links. The protocol only exchanges packets between
ports you congure as LACP-capable.
Modes
A LAG includes three conguration 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 congured 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 dierence 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 specied LAG, including a dynamically created
LAG. The interfaces restore and are ready for conguration.
• A maximum of 128 port-channels with up to 16 members per channel are allowed.
Conguration
LACP is enabled globally by default. You can congure aggregated ports with compatible active and passive LACP modes to automatically
link them.
1 Congure 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 Congure 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 Congure the LACP rate in INTERFACE mode (default normal).
lacp rate [fast | normal]
Congure 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 conguration
OS10(conf-range-eth1/1/7-1/1/8)# do show running-configuration
...
!
interface ethernet1/1/7
lacp port-priority 4096
lacp rate fast
no shutdown
!
Layer 2
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