Port Trunking
Trunk Group Operation Using LACP
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 will replace it (Port
Status becomes “Up”). When the other port becomes active again, the replace-
ment 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.
ProCurve(eth-B1-B8)# show lacp
LACP
PORT LACP TRUNK PORT LACP LACP
NUMB ENABLED GROUP STATUS PARTNER STATUS
---- ------- ------- ------- ------- -------
B1 Active Dyn1 Up Yes Success
B2 Active Dyn1 Up Yes Success
B3 Active Dyn1 Up Yes Success
B4 Active Dyn1 Up Yes Success
B5 Active Dyn1 Blocked Yes Failure
B6 Active Dyn1 Blocked Yes Failure
B7 Active B7 Down No Success
B8 Active B8 Down No Success
Figure 12-11. Blocked Ports with LACP
12-23
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