Forum Discussion
NimbostratusWeird Trunk Behavior
The interfaces are connected and reachable via pinging. I have a continuous ping reaching the devices and then after a couple of hours it drops and times out. Then after another long period it re-establishes connectivity and is pingable again. Anyone ever seen this behavior? I have about 5 pairs that keep behaving the same way. My company is not open to using LACP and apparently there are devices configured in this fashion that are working in production. Anyone ever seen this type of behavior? Any ideas? Thanks...below you will see the port-channel config on the switch and the bigip_base.conf.
Switch Config:
interface Port-channel1
description
sf45-iaedev-ltm1
switchport access
vlan 999
switchport trunk
allowed vlan 26,27,30,32,36,37,39,117,118
switchport mode
trunk
end
!
interface GigabitEthernet0/12
description
sf45-iaedev-ltm1-i1
switchport access
vlan 999
switchport trunk
allowed vlan 26,27,30,32,36,37,39,117,118
switchport mode
trunk
speed 1000
duplex full
no cdp enable
channel-group 1 mode
on
spanning-tree
portfast
spanning-tree
bpduguard enable
spanning-tree guard
root
end
!
interface GigabitEthernet0/13
description
sf45-iaedev-ltm1-e1
switchport access
vlan 999
switchport trunk
allowed vlan 26,27,30,32,36,37,39,117,118
switchport mode
trunk
speed 1000
duplex full
no cdp enable
channel-group 1 mode
on
spanning-tree
portfast
spanning-tree
bpduguard enable
spanning-tree guard
root
end
Bigip_base.conf:
interface Port-channel1
description
sf45-iaedev-ltm1
switchport access
vlan 999
switchport trunk
allowed vlan 26,27,30,32,36,37,39,117,118
switchport mode
trunk
end
!
interface GigabitEthernet0/12
description
sf45-iaedev-ltm1-i1
switchport access
vlan 999
switchport trunk
allowed vlan 26,27,30,32,36,37,39,117,118
switchport mode
trunk
speed 1000
duplex full
no cdp enable
channel-group 1 mode
on
spanning-tree
portfast
spanning-tree
bpduguard enable
spanning-tree guard
root
end
!
interface GigabitEthernet0/13
description
sf45-iaedev-ltm1-e1
switchport access
vlan 999
switchport trunk
allowed vlan 26,27,30,32,36,37,39,117,118
switchport mode
trunk
speed 1000
duplex full
no cdp enable
channel-group 1 mode
on
spanning-tree
portfast
spanning-tree
bpduguard enable
spanning-tree guard
root
end
1 Reply
HamishCirrocumulus
Yes, you (probably) have a cabling problem...
What do you mean 'your company is not open to using LACP'? If you're using channels with no signalling, then your company deserves a kicking. NEVER EVER configure a channel in production without singalling. It may work today, but it probably wont' work tomorrow. And you'll spend your days trying to discover why. Your company is having a laugh if they think this is going to work well. (And I don't care if its working in production today. Like I said, it probably won't tomorrow... And etherchannel problems without signalling are the worst things to try & debug. Especially when production traffic is on them and your company starts yelling at you to fix it).
Sorry...
If it helps, you could always point them at the cisco docs that also advise you not to configure channels without signalling...
FWIW you get this if you try to configure channels with ESX as well... That does channelling and doesn't understand LACP at all...
H
