ProCurve 2910al-24g Management And Configuration Manual page 304

Port Trunking
Trunk Group Operation Using LACP
12-24
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
PORT LACP
NUMB ENABLED
---- -------
B1 Active
B2 Active
B3 Active
B4 Active
B5 Active
B6 Active
B7 Active
B8 Active
Figure 12-11. Blocked Ports with LACP
LACP
TRUNK PORT
GROUP STATUS
------- -------
Dyn1 Up
Dyn1 Up
Dyn1 Up
Dyn1 Up
Dyn1 Blocked
Dyn1 Blocked
B7 Down
B8 Down
LACP LACP
PARTNER STATUS
------- -------
Yes Success
Yes Success
Yes Success
Yes Success
Yes Failure
Yes Failure
No Success
No Success