KB.15.15

run together.

(HP_Switch_name#)

To restore LACP to the port, you must remove port security and re-enable LACP active or passive.

Changing trunking methods

To convert a trunk from static to dynamic, you must first eliminate the static trunk.

Static LACP trunks

When a port is configured for LACP (active or passive), but does not belong to an existing trunk

group, you can add that port to a static trunk. Doing so disables dynamic LACP on that port, which

means you must manually configure both ends of the trunk.

Dynamic LACP trunks

You can configure a port for LACP-active or LACP-passive, but on a dynamic LACP trunk you cannot

configure the other options that you can on static trunks. If you want to manually configure a trunk,

use the trunk command. (See "Using the CLI To Configure a Static or Dynamic Trunk Group")

VLANs and dynamic LACP

A dynamic LACP trunk operates only in the default VLAN (unless you have enabled GVRP on the

switch and use Forbid to prevent the ports from joining the default VLAN.)

If you want to use LACP for a trunk on a non-default VLAN and GVRP is disabled, configure the

trunk as a static trunk.

Blocked ports with older devices.

Some older devices are limited to four ports in a trunk. When eight LACP-enabled ports are

connected to one of these older devices, four ports connect, but the other four ports are blocked.

The LACP status of the blocked ports is shown as "Failure."

If one of the other ports becomes disabled, a blocked port replaces it (Port Status becomes "Up".)

When the other port becomes active again, the replacement port goes back to blocked (Port Status

is "Blocked".) It can take a few seconds for the switch to discover the current status of the ports.

Figure 60 Blocked ports with LACP

If there are ports that you do not want on the default VLAN, ensure that they cannot become

dynamic LACP trunk members. Otherwise a traffic loop can unexpectedly occur. For example:

156 Port Trunking