The Trunk group feature allows you to manually configure multiple high-speed load-sharing links between two Layer 2 Switches or Layer 3 Switches or between a Layer 2 Switch and Layer 3 Switch and a server.
In addition to enabling load sharing of traffic, trunk groups provide redundant, alternate paths for
traffic if any of the segments fail.
Trunk groups are manually-configured aggregate links containing multiple ports
IEEE 802.3ad link aggregation is a protocol that dynamically creates and manage trunk groups
Static Trunk Groups:
Use the "trunk ethernet <ports>" command to define a trunk group. After trunk groups are defined, use the "trunk deploy" command to activate all queued trunk configurations.
Brocade software supports the IEEE 802.3ad standard for link aggregation.
This standard describes the Link Aggregation Control Protocol (LACP), a mechanism for allowing ports on both sides of a redundant link to form a trunk link (aggregate link), without the need for manual configuration of the ports into trunk groups.
When you enable link aggregation on a group of ports, the ports can negotiate with the ports at the remote end of the links to establish trunk groups.
Key: Every port that is 802.3ad-enabled has a key. The key identifies the group of potential trunk ports to which the port belongs. Ports with the same key are called a key group and are eligible to be in the same trunk group.