149| DellPowerConnect W- Series ArubaOS 6.2 | User Guide
Configuring LACP
Two LACP configured devices exchange LACPDUs to form a LAG. A device is co nfigurableas an active or passive
participant. In active mode, the device initiates DUs irrespective of the partner state; passive mode devices respond
only to the incoming DUs sent by the partner device. Hence, to form a LAG group between two devices, one device
must be an active participant. For detailed information on theLA CP commands, see theA rubaOSCommand Line
ReferenceGuide.
In the CLI
LACPDUs exchange their corresponding system identifier/priority along with their port’s key/priority. This
information determinest he LAG of a given port. The LAG for a port is selected based on it’s keys; the port is placed
in that LAG only when it’s system ID /keyand partner's system ID /keymatc hes the other ports in the LAG (if the
grouphas ports).
1. E nableLA CP and configure the per-portspeci fic LACP. The group numberrange is 0 to 7.
lacp group<group_number> mode {active | passive}
lActive mode—the interface is in active negotiating state. LACP runs on any linkthat is configured to be in
the active state. The port in an active mode also automatically initiates negotiations wi th otherpo rts by
initiating LACP packets.
lPassive mode—the interface is
not
in an active negotiating state. LACP runs on any link that is configured in
a passive state. The port in a passive mode responds to negotiations requests from other ports that are in an
active state. Ports in passive state respond to LACP packets.
NOTE:A port in a passive state cannot setup a port channel (LAG group) with another port in a passive state.
2. Set t het imeout for theLA CP session. The timeout value is the amount of time that a port-channeli nterface
waits for a LACPDU from the remote system before terminating the LACP session. The default time out value
is long (90 seconds);s horti s 3 seconds.
lacp timeout {long | short}
3. Set t heport priorit y.
lacp port-priority <priority_value>
The higherthe priority value the lower the priority. Range is 1 to 65 535 and defaultis 255.
4. V iew your LACP configuration.
The port uses the groupnumber +1 as the “actor admin key”. By default, allt heports use the long timeout value
(90 seconds).
(host)#show lacp 0 neighbor
Flags: S - Device is requesting Slow LACPDUs
F - Device is requesting fast LACPDUs
A - Device is in active mode P - Device is in passive mode
Partner's information
---------------------
Port Flags Pri OperKey State Num Dev Id
---- ----- ---- ------- ----- ---- ----------------
FE 1/1 SA 1 0x10 0x45 0x5 00:0b:86:51:1e:70
FE 1/2 SA 1 0x10 0x45 0x6 00:0b:86:51:1e:70
Whena port in a LA G,is misconfigured (that is, the partnerdevice is different thant heot herports) or the
neighborti mesout or can not exchangeLACPD Us with the partner,the port stat usi s displayedas “DOWN”
(see the followingexample).
(host)#show lacp 0 internal