09-27-2017 06:18 AM - edited 03-08-2019 12:11 PM
Hi all,
I've tried to establish LACP neighbor between 3850 and 2960X, but I can't see the LACP relationship come up.
The LACP counter on 3850 is normal, there have send and receive LACPDU, but there have no receive packet on 2960X, even I tried to debug lacp all on 2960X and restart interface on 3850, there still can not receive LACPDU from Gi2/0/49 on 2960X.
I saw there have bug on 3.7.4,and already fixed on 3.7.5.
If it is possible to meet the bug again on these version?
# IOS version on 3850-24XS-E
Cisco IOS Software, IOS-XE Software, Catalyst L3 Switch Software (CAT3K_CAA-UNIVERSALK9-M), Version 03.07.05.E RELEASE SOFTWARE (fc1)
#Config on 3850
interface Port-channel8
switchport trunk allowed vlan 123
switchport mode trunk
!
interface TenGigabitEthernet1/0/8
switchport trunk allowed vlan 123
switchport mode trunk
channel-group 8 mode active
!
interface TenGigabitEthernet2/0/8
switchport trunk allowed vlan 123
switchport mode trunk
channel-group 8 mode active
#show lacp counter on 3850
LACPDUs Marker Marker Response LACPDUs
Port Sent Recv Sent Recv Sent Recv Pkts Err
---------------------------------------------------------------------
Channel group: 8
Te1/0/8 59 60 0 0 0 0 0
Te2/0/8 226 58 0 0 0 0 0
#IOS version on 2960X-48TS & 2960X-48FPS
Cisco IOS Software, C2960X Software (C2960X-UNIVERSALK9-M), Version 15.2(2)E6, RELEASE SOFTWARE (fc1)
#Config on 2960X
interface Port-channel1
description "To DG5 Distribution switch"
switchport trunk allowed vlan 123
switchport mode trunk
spanning-tree portfast disable
spanning-tree bpdufilter disable
spanning-tree bpduguard disable
spanning-tree guard none
ip dhcp snooping trust
!
interface GigabitEthernet1/0/49
description "To DG5 Distribution switch"
switchport trunk allowed vlan 123
switchport mode trunk
spanning-tree portfast disable
spanning-tree bpdufilter disable
spanning-tree bpduguard disable
spanning-tree guard none
channel-group 1 mode active
ip dhcp snooping trust
!
interface GigabitEthernet2/0/49
switchport trunk allowed vlan 123
switchport mode trunk
spanning-tree portfast disable
spanning-tree bpdufilter disable
spanning-tree bpduguard disable
spanning-tree guard none
channel-group 1 mode active
ip dhcp snooping trust
# show lacp counter on 2960X
LACPDUs Marker Marker Response LACPDUs
Port Sent Recv Sent Recv Sent Recv Pkts Err
---------------------------------------------------------------------
Channel group: 1
Gi1/0/49 83 77 0 0 0 0 0
Gi2/0/49 90 0 0 0 0 0 0
09-27-2017 06:41 AM - edited 09-27-2017 07:00 AM
Hello,
Make sure that ALL the port participating in the etherchannel have identical settings.
This includes speed, Vlans, Swichport mode.
You may also run --> sh interface Port-channel XX <-- on both the switches and compare the output.
You may also set the etherchannel to Active-Active and see if that helps..
If you find a post helpfull mark it as help full.
Regards,
Moses.
09-27-2017 07:27 AM
Hi Moses,
Thank you for your opinion!
I've tried to reload second 3850 and it's work now.
09-27-2017 07:26 AM
Hi
Also check the negotiation, speed and duplex the same for both.
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