11-30-2018 09:05 AM - edited 03-08-2019 04:42 PM
Currently switches are connected via SW1 Gig 1/0/25 > SW Gig 1/0/6
When I connect the second fibre link the channel goes down. Does the config look OK, what else could be causing this?
SW1
GB34SW1039#show run int gi1/0/25
Building configuration...
Current configuration : 210 bytes
!
interface GigabitEthernet1/0/25
description UPL*GB34SW1034*Gi1/0/6*Po16
switchport trunk native vlan 999
switchport mode trunk
switchport nonegotiate
channel-group 1 mode on
ip dhcp snooping trust
end
GB34SW1039#show run int gi1/0/26
Building configuration...
Current configuration : 210 bytes
!
interface GigabitEthernet1/0/26
description UPL*GB34SW1034*Gi2/0/6*Po16
switchport trunk native vlan 999
switchport mode trunk
switchport nonegotiate
channel-group 1 mode on
ip dhcp snooping trust
interface Port-channel1
description UPL*GB34SW1034*Po16
switchport trunk native vlan 999
switchport mode trunk
switchport nonegotiate
ip dhcp snooping trust
end
SW2
GB34SW1034#show run int gi1/0/6
Building configuration...
Current configuration : 287 bytes
!
interface GigabitEthernet1/0/6
description UPL*GB34SW1039*Gi1/0/25*Po1
switchport trunk encapsulation dot1q
switchport trunk native vlan 999
switchport mode trunk
switchport nonegotiate
spanning-tree bpduguard disable
spanning-tree guard root
channel-group 16 mode active
end
GB34SW1034#show run int gi2/0/6
Building configuration...
Current configuration : 287 bytes
!
interface GigabitEthernet2/0/6
description UPL*GB34SW1039*Gi1/0/26*Po1
switchport trunk encapsulation dot1q
switchport trunk native vlan 999
switchport mode trunk
switchport nonegotiate
spanning-tree bpduguard disable
spanning-tree guard root
channel-group 16 mode active
interface Port-channel16
description UPL*GB34SW1039*Po1
switchport trunk encapsulation dot1q
switchport trunk native vlan 999
switchport mode trunk
switchport nonegotiate
spanning-tree bpduguard disable
spanning-tree guard root
end
11-30-2018 09:19 AM
if you use mode active on channel group cmd - you're using LACP - so should use keyword passive on other side not on
sw 1 need to do - delete channel-group 1 mode on
use channel-group 1 mode passive
regards, mk
please rate if helpful or accept solution :)
11-30-2018 02:04 PM
SW1 should be channel-group 1 mode passive/active If you want use LACP.
LACP mode active is to be preferred as it allows to exchange LACP control frames on each member link and allows to prevent some issues that can arise from errors in cabling
11-30-2018 03:40 PM
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