Port Trunking
Trunk Group Operation Using LACP
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-1-8)# show lacp
LACP
PORT LACP TRUNK PORT LACP LACP
NUMB ENABLED GROUP STATUS PARTNER STATUS
---- ------- ------- ------- ------- -------
1 Active Dyn1 Up Yes Success
2 Active Dyn1 Up Yes Success
3 Active Dyn1 Up Yes Success
4 Active Dyn1 Up Yes Success
5 Active Dyn1 Blocked Yes Failure
6 Active Dyn1 Blocked Yes Failure
Figure 12-11. Blocked Ports with LACP
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