Hello Alex,
LACP allows for this by using LACP priority on member links
by using a config like the following:
h run int te1/3
Building configuration...
Current configuration : 227 bytes
!
interface TenGigabitEthernet1/3
switchport
switchport trunk encapsulation dot1q
switchport mode trunk
mtu 9216
logging event link-status
>>>>lacp port-priority 65535
channel-protocol lacp
channel-group 1 mode active
end
without placing the command on the other two member links this port is kept in halted mode
sh etherchannel 1 det
Group state = L2
Ports: 3 Maxports = 16
Port-channels: 1 Max Port-channels = 16
Protocol: LACP
Minimum Links: 0
Ports in the group:
-------------------
Port: Te1/1
------------
Port state = Up Mstr In-Bndl
Channel group = 1 Mode = Active Gcchange = -
Port-channel = Po1 GC = - Pseudo port-channel = Po1
Port index = 1 Load = 0x55 Protocol = LACP
Flags: S - Device is sending Slow LACPDUs F - Device is sending fast LACPDUs.
A - Device is in active mode. P - Device is in passive mode.
Local information:
LACP port Admin Oper Port Port
Port Flags State Priority Key Key Number State
Te1/1 SA bndl 32768 0x1 0x1 0x1D 0x3D
Partner's information:
Partner Partner LACP Partner Partner Partner Partner Partner
Port Flags State Port Priority Admin Key Oper Key Port Number Port State
Te1/1 SA bndl 32768 0x0 0x1 0x1D 0x3D
Age of the port in the current state: 22d:13h:12m:43s
Port: Te1/3
------------
Port state = Up Mstr Hot-stdby Not-in-Bndl
Channel group = 1 Mode = Active Gcchange = -
Port-channel = null GC = - Pseudo port-channel = Po1
Port index = 0 Load = 0x00 Protocol = LACP
Flags: S - Device is sending Slow LACPDUs F - Device is sending fast LACPDUs.
A - Device is in active mode. P - Device is in passive mode.
Local information:
LACP port Admin Oper Port Port
Port Flags State Priority Key Key Number State
Te1/3 FA hot-sby 65535 0x1 0x1 0x1F 0x7
Partner's information:
Partner Partner LACP Partner Partner Partner Partner Partner
Port Flags State Port Priority Admin Key Oper Key Port Number Port State
Te1/3 FA hot-sby 65535 0x0 0x1 0x1F 0x7
Age of the port in the current state: 22d:13h:53m:12s
Port: Te1/5
------------
Port state = Up Mstr In-Bndl
Channel group = 1 Mode = Active Gcchange = -
Port-channel = Po1 GC = - Pseudo port-channel = Po1
Port index = 0 Load = 0xAA Protocol = LACP
Flags: S - Device is sending Slow LACPDUs F - Device is sending fast LACPDUs.
A - Device is in active mode. P - Device is in passive mode.
Local information:
LACP port Admin Oper Port Port
Port Flags State Priority Key Key Number State
Te1/5 SA bndl 32768 0x1 0x1 0x1E 0x3D
Partner's information:
Partner Partner LACP Partner Partner Partner Partner Partner
Port Flags State Port Priority Admin Key Oper Key Port Number Port State
Te1/5 SA bndl 32768 0x0 0x1 0x1E 0x3D
Age of the port in the current state: 23d:12h:48m:12s
Port-channels in the group:
----------------------
Port-channel: Po1 (Primary Aggregator)
------------
Age of the Port-channel = 793d:01h:59m:40s
Logical slot/port = 14/2 Number of ports = 2
Hope to help
Giuseppe
