cisco 3650 denali lacp port stack master fails

[johnblack2045]

Hello All

i m using 2 switches 3650 denali 16.6.x with stackwise module

i use group port (LACP)  and  there is only one vlan 2 in my configuration with an IP address

port 24 is configured  with lacp on switch 1 and defined as switchport  access vlan 2

port 24 is configured  with lacp on switch  2 and defined as switchport  access vlan 2

i test my configuration stack:

when i unplug power cable on member switch there is no problem with my LACP port.Connectivity is OK

when i unplug power cable on my Switch Master -> member switch becomes master (it's OK)

but my lacp port connectivity is failed

i 've tried to use "stack-mac persistent timer 0" -> nothing is resolved,no connectivity with lacp port

Have you got any idea ? is it a bug ?

thanks for your help

Best regards

[balaji.bandi]

Can you post the full configuration to look, please.

[johnblack2045]

Hello Julian

in my config.txt:

no spanning-tree vlan 1-4094

vtp mode transparent
Vlan 2 name ZZZZZZ

no shutdown

interface Vlan2
description "vlan-2"
ip address XXX.XXX.XXX.XXX YYY.YYY.YYY.YYY
no shutdown

interface Port-channel 1
lacp max-bundle 2
switchport mode access
switchport access vlan 2
switchport nonegotiate
spanning-tree portfast disable
no shutdown

interface GigabitEthernet1/0/24

switchport mode access
switchport access vlan 2
switchport nonegotiate
spanning-tree portfast disable
channel-group 1 mode active
channel-protocol lacp
no shutdown

Interface GigabitEthernet2/0/24
switchport mode access
switchport access vlan 2
switchport nonegotiate
spanning-tree portfast disable
channel-group 1 mode active
channel-protocol lacp
no shutdown

-show switch detail

switch 1 master ready

switch 2 member ready

-show etherchannel summary

1   Po1(SU)   LACP   Gi1/0/24 Gi2/0/24  OK1 Po1(SU) LACP Gi1/0/24 Gi2/0/24 # ok

-sh vlan

vlan2  gi1/0/24 gi2/0/24 Po1(SU)

Best Regards

[julian.bendix]

Hi!

okay another thing, please always post full output:

#show int Gi2/0/24
#show log | i 2/0/24
#show log | i 1/0/24

Config looks ok so far.

Are you sure config on remote end is definitely ok?

Best regards
Julian

[johnblack2045]

Hello Julian

"Are you sure config on remote end is definitely ok?  ->  i m sure

thanks

[julian.bendix]

Hi!

Can you post the output of the following commands while the switch is stacked and both ports connected?

#show run interface <physical port on master>
#show run interface <physical port on member>
#show run interface po <port channel num>

#show etherchannel <port channel num> summary
#show switch detail

Best regards
Julian