HP PROCURVE 2520 Management And Configuration Manual page 286

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.
Figure 12-11. Blocked Ports with LACP
12-24
ProCurve(eth-1-8)# show lacp
PORT LACP
NUMB ENABLED
---- -------
1 Active Dyn1
2 Active Dyn1
3 Active Dyn1
4 Active Dyn1
5 Active Dyn1
6 Active Dyn1
LACP
TRUNK PORT
GROUP STATUS
------- -------
Up Yes
Up Yes
Up Yes
Up Yes
Blocked Yes
Blocked Yes
LACP LACP
PARTNER STATUS
------- -------
Success
Success
Success
Success
Failure
Failure