Half-duplex, different port speeds, or both not allowed in LACP trunks

Theports on both sides of an LACP trunk must be configured for the same speed and for full-duplex (FDx). The 802.3ad LACP standard specifies a full-duplex (FDx) requirement for LACP trunking. (10-gigabit ports operate only at FDx.)

A port configured as LACP passive and not assigned to a port trunk can be configured to half-duplex (HDx). However, in any of the following cases, a port cannot be reconfigured to an HDx setting:

  • If the port is a 10-gigabit port.

  • If a port is set to LACP Active, you cannot configure it to HDx.

  • If a port is already a member of a static or dynamic LACP trunk, you cannot configure it to HDx.

  • If a port is already set to HDx, the switch does not allow you to configure it for a static or dynamic LACP trunk.