System information

6-24
Optimizing Port Usage Through Traffic Control and Port Trunking
Port Trunking
Optimizing Port Usage
Through Traffic Control and
Trunk Group Operation Using LACP
The switch can automatically configure a dynamic LACP trunk group or you
can manually configure a static LACP trunk group. The methods for displaying
Note LACP requires full-duplex (FDx) links of the same media type (10/100Base-T,
100FX, etc.) and speed, and enforces speed and duplex conformance across
a trunk group.
LACP trunk status include:
In most cases, trunks configured for LACP on the ProCurve 2512/ 2524
switches operate as described in table 6-6:
Table 6-6. LACP Trunk Types
Trunk Display Method Static LACP Trunk Dynamic LACP Trunk
CLI
show lacp command Included in listing. Included in listing.
CLI
show trunk command Included in listing. Not included.
Port/Trunk Settings screen in menu interface Included in listing. Not included
LACP Port Trunk
Configuration
Operation
Dynamic LACP This option automatically establishes an
802.3ad-compliant trunk group, with Dyn1 for the port Group
name and
LACP for the port Type parameter.
Under the following conditions, the switch automatically establishes a dynamic LACP port trunk group:
• 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:
Either of the above link configurations allow a dynamic LACP trunk link.
Standby Links: A maximum of four 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 four-port dynamic LACP trunk, ensure that both 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.
Switch 1
Port X:
LACP Enable: Active
Port Y:
LACP Enable: Active
Switch 2
Port A:
LACP Enable: Active
Port B:
LACP Enable: Passive
Active-to-Active
Active-to-Passive