Forum Discussion
Reed_Gregory_76
Nimbostratus
NimbostratusLACP out of sync errors
We have a redundant pair of 3400 LTMs, and have LACP port trunks working to a stack of Cisco 3750G switches, and to our Cisco 6509 core. However we seem to have trouble getting the LACP to function probably with a new Cisco 3750E switch stack. All settings appear the same, but the F5 and Cisco 3750E switches are complaining about out of sync errors.
Working sets:
Channel group 3 neighbors
Partner's information
LACP port Admin Oper Port Port
Port Flags Priority Dev ID Age key Key Number State
Gi1/0/11 SA 257 0001.d78f.1c00 17s 0x0 0x2 0x101 0x3D
Gi3/0/32 SA 258 0001.d78f.1c00 18s 0x0 0x2 0x102 0x3D
Channel group 4 neighbors
Partner's information:
LACP port Admin Oper Port Port
Port Flags Priority Dev ID Age key Key Number State
Gi2/0/11 SA 257 0001.d78f.0d00 4s 0x0 0x2 0x101 0x3D
Gi4/0/32 SA 258 0001.d78f.0d00 3s 0x0 0x2 0x102 0x3D
Nonworking set:
Channel group 16 neighbors
Partner's information:
LACP port Admin Oper Port Port
Port Flags Priority Dev ID Age key Key Number State
Gi1/0/2 SA 261 0001.d78f.0d00 19s 0x0 0x0 0x105 0x45
Gi2/0/2 SA 262 0001.d78f.0d00 19s 0x0 0x0 0x106 0x45
F5 LTM log shows this:
Aug 20 17:20:38 local/bigip2 info lacpd[2014]: 01160010:6: Link 1.6 removed from aggregation
Aug 20 17:21:38 local/bigip2 info lacpd[2014]: 01160011:6: Link 1.5 Actor Out of Sync
Aug 20 17:21:38 local/bigip2 info lacpd[2014]: 01160012:6: Link 1.5 Partner Out of Sync
Aug 20 17:21:38 local/bigip2 info lacpd[2014]: 01160011:6: Link 1.6 Actor Out of Sync
Aug 20 17:21:38 local/bigip2 info lacpd[2014]: 01160012:6: Link 1.6 Partner Out of Sync
Any help would be greatly appreciated.
- The_BhattmanCan you post your port channel configuration of the Cisco 3750 with respect to the F5 connections.
CB 
Reed_Gregory_763750E:
interface GigabitEthernet1/0/2
description F5 Secondary Uplink
switchport trunk encapsulation dot1q
switchport trunk native vlan 999
switchport trunk allowed vlan 1010,1016
switchport mode trunk
channel-group 15 mode passive
3750G:
interface GigabitEthernet1/0/11
description Uplink to Primary F5
switchport trunk encapsulation dot1q
switchport trunk native vlan 999
switchport trunk allowed vlan 5,6,10,11,16
switchport mode trunk
channel-group 3 mode active- Reed_Gregory_76750E (does not work... interface up / protocol down both interfaces):
interface GigabitEthernet1/0/2
description F5 Secondary Uplink
switchport trunk encapsulation dot1q
switchport trunk native vlan 999
switchport trunk allowed vlan 1010,1016
switchport mode trunk
channel-group 16 mode active
end
interface GigabitEthernet2/0/2
description F5 Secondary Uplink
switchport trunk encapsulation dot1q
switchport trunk native vlan 999
switchport trunk allowed vlan 1010,1016
switchport mode trunk
channel-group 16 mode active
end
interface Port-channel16
description F5 Secondary Uplink
switchport trunk encapsulation dot1q
switchport trunk native vlan 999
switchport trunk allowed vlan 1010,1016
switchport mode trunk
end
FunnyFarmsho lacp nei
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
Channel group 16 neighbors
Partner's information:
LACP port Admin Oper Port Port
Port Flags Priority Dev ID Age key Key Number State
Gi1/0/2 SA 261 0001.d78f.0d00 21s 0x0 0x0 0x105 0x45
Gi2/0/2 SA 262 0001.d78f.0d00 21s 0x0 0x0 0x106 0x45
IOS: C3750E Software (C3750E-UNIVERSALK9-M), Version 12.2(50)SE2
flash:c3750e-universalk9-mz.122-50.SE2.bin
********************************************************
3750 stack (does work):
interface GigabitEthernet2/0/11
description Uplink to Secondary F5
switchport trunk encapsulation dot1q
switchport trunk native vlan 999
switchport trunk allowed vlan 5,6,10,11,16
switchport mode trunk
channel-group 4 mode active
end
interface GigabitEthernet4/0/32
description Uplink to Secondary F5
switchport trunk encapsulation dot1q
switchport trunk native vlan 999
switchport trunk allowed vlan 5,6,10,11,16
switchport mode trunk
channel-group 4 mode active
end
interface Port-channel4
description Uplink to Secondary F5
switchport trunk encapsulation dot1q
switchport trunk native vlan 999
switchport trunk allowed vlan 5,6,10,11,16
switchport mode trunk
end
ServerFarmshow lacp nei
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
Channel group 4 neighbors
Partner's information:
LACP port Admin Oper Port Port
Port Flags Priority Dev ID Age key Key Number State
Gi2/0/11 SA 257 0001.d78f.0d00 19s 0x0 0x2 0x101 0x3D
Gi4/0/32 SA 258 0001.d78f.0d00 18s 0x0 0x2 0x102 0x3D
IOS: C3750 Software (C3750-IPSERVICESK9-M), Version 12.2(50)SE1
c3750-ipservicesk9-mz.122-50.SE1.bin - The_BhattmanHave you tried using flowcontrol command?
CB - Reed_Gregory_76Sending flow control is unsupported. Receiving flow control is "off".
That's the default. Use flowcontrol to set how?
flowcontrol (on|off|desired) - The_BhattmanSorry...I believe it the following is what I meant Click here
- Reed_Gregory_76right, but do you have recommendations on how the flowcontrol should be set on the cisco and/or F5 sides?
- The_Bhattman
For the Cisco you should be able to enter
set port flowcontrol recieve on
set port flowcontrol send on
on the Port Channel Group or the interfaces which contain the channel-group.
I am not sure if there is a setting on the F5 that is equivelant to that.
I have never done this between a Cisco and F5, but I had the same type of issue between a Cisco and Generic load balancer and it solved the problem.
CB - dennypayne
Employee
You have to use true LACP mode on the Cisco side, not Etherchannel (Cisco-proprietary). I think that the channel-group command uses Etherchannel by default unless you specify LACP (I'm not familiar with the exact syntax).
Also the trunk interface on the F5 needs to be in tagged mode on each VLAN to support the multiple VLANs (some people get confused because what F5 calls a trunk is not what Cisco calls a trunk).
Denny - The_BhattmanI believe that he already has LACP turned on unconditionally by the command
channel-group x mode active
CB
