Port Trunking

Port Status and Configuration

Table 12-4. LACP Trunk Types

LACP Port Trunk

Operation

 

 

 

 

Configuration

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Dynamic LACP

This option automatically establishes an 802.3ad-complianttrunk group, with LACP for the port Type

 

parameter and DynX for the port Group name, where X is an automatically assigned value from 1 to 6

 

(2600, 2600-PWR, 4100gl, and 6108) or 1 to 24 (2800), depending on how many dynamic and static trunks

 

are currently on the switch. (The 2600, 2600-PWR, 4100gl, and 6108 switches allow a maximum of six

 

trunk groups in any combination of static and dynamic trunks; the 2800 switch allows a maximum of 24

 

trunk groups in any combination of static and dynamic trunks.)

 

Under the following conditions, the switch automatically establishes a dynamic LACP port trunk group

 

and assigns a port Group name:

 

 

 

 

 

• The ports on both ends of a link have compatible mode settings (speed and duplex).

 

• The port on one end of a link must be configured for LACP Active and the port on the other end of

 

the same link must be configured for either LACP Passive (the default) or LACP Active. For example:

 

 

 

 

 

 

 

 

 

 

Switch 1

 

 

Switch 2

 

 

 

Port X:

Active-to-Active

 

Port A:

 

 

 

LACP Enable: Active

 

 

LACP Enable: Active

 

 

 

 

 

 

 

 

 

Port Y:

Active-to-Passive

 

Port B:

 

 

 

LACP Enable: Active

 

 

LACP Enable: Passive

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Either of the above link configurations allow a dynamic LACP trunk link.

Standby Links: A maximum of four (2600, 2600-PWR, 4100gl, and 6108) or eight (2800) operating links are allowed in the trunk, but, with dynamic LACP, you can configure one or more backup links that the switch automatically activates if a primary link fails. To configure a link as a standby for an existing dynamic LACP trunk, ensure that the ports in the standby link are configured the same as either of the above examples.

Displaying Dynamic LACP Trunk Data: To list the configuration and status for a dynamic LACP trunk, use the CLI show lacp command.

 

 

Note: The dynamic trunk is automatically created by the switch, and is not listed in the static trunk

 

 

listings available in the menu interface or in the CLI show trunk listing.

 

 

Static LACP

The trunk operates if the trunk group on the opposite device is running one of the following trunking

 

protocols:

 

•

Active LACP

 

•

Passive LACP

 

•

Trunk

 

•

FEC

This option uses LACP for the port Type parameter and TrkX for the port Group parameter, where X is an automatically assigned value from 1 to 6 (2600, 2600-PWR, 4100gl, and 6108) or 1 to 24 (2800), depending on how many static trunks are currently operating on the switch. (The switch allows the maximum number of trunk groups in any combination of static and dynamic trunks.)

Displaying Static LACP Trunk Data: To list the configuration and status for a static LACP trunk, use the CLI show lacp command. To list a static LACP trunk with its assigned ports, use the CLI show trunk command or display the menu interface Port/Trunk Settings screen.

Static LACP does not allow standby ports.

12-20