12-05-2017 11:01 AM - edited 03-08-2019 01:00 PM
Hi,
I have a strange issue.
at the main office i have 2 3850-48XS-S with VSS stack and at the remote offic 2 3850-12XS-S cross-stack.
i want to activated a port-channel between these two stack.
when i desactivated one link for tested, it's ok
but when i desactivated the second link (after réactivated the first), nothing works.
When the 2 link is activated, there are only traffic under the first link, nothing under the second.
---------------------------------------------------------------------------
interface Port-channel3
description vers-faouet
switchport trunk native vlan 99
switchport trunk allowed vlan 99,300
switchport mode trunk
switchport nonegotiate
VSS SWITCH
interface TenGigabitEthernet1/0/3 and interface TenGigabitEthernet2/0/3
switchport trunk native vlan 99
switchport trunk allowed vlan 99,300
switchport mode trunk
switchport nonegotiate
channel-group 3 mode on
ip nbar protocol-discovery
CROSSSTACK SWITCH
interface TenGigabitEthernet1/0/3 and interface TenGigabitEthernet2/0/3
switchport trunk native vlan 99
switchport trunk allowed vlan 99,300
switchport mode trunk
switchport nonegotiate
channel-group 3 mode on
ip nbar protocol-discovery
---------------------------------------------------------------------------
I have also test this but same problem
interface Port-channel3
description vers-faouet
switchport trunk native vlan 99
switchport trunk allowed vlan 99,300
switchport mode trunk
switchport nonegotiate
VSS SWITCH
interface TenGigabitEthernet1/0/3 and interface TenGigabitEthernet2/0/3
switchport trunk native vlan 99
switchport trunk allowed vlan 99,300
switchport mode trunk
switchport nonegotiate
channel-protocole lacp
channel-group 3 mode active
ip nbar protocol-discovery
CROSSSTACK SWITCH
interface TenGigabitEthernet1/0/3 and interface TenGigabitEthernet2/0/3
switchport trunk native vlan 99
switchport trunk allowed vlan 99,300
switchport mode trunk
switchport nonegotiate
channel-protocole lacp
channel-group 3 mode active
ip nbar protocol-discovery
---------------------------------------------------------------------------
I have also test this but same problem
interface Port-channel3
description vers-faouet
switchport trunk native vlan 99
switchport trunk allowed vlan 99,300
switchport mode trunk
switchport nonegotiate
VSS SWITCH
interface TenGigabitEthernet1/0/3 and interface TenGigabitEthernet2/0/3
switchport trunk native vlan 99
switchport trunk allowed vlan 99,300
switchport mode trunk
switchport nonegotiate
channel-protocole lacp
channel-group 3 mode active
ip nbar protocol-discovery
CROSSSTACK SWITCH
interface TenGigabitEthernet1/0/3 and interface TenGigabitEthernet2/0/3
switchport trunk native vlan 99
switchport trunk allowed vlan 99,300
switchport mode trunk
switchport nonegotiate
channel-protocole lacp
channel-group 3 mode passive
ip nbar protocol-discovery
----------------------------------------------------
Somebody have idea for resolve my problem?
Solved! Go to Solution.
12-07-2017 06:11 AM
I have found the resolve issue!
i havé upgrade remote stack with:
- upgrade to 16.6.2
- activated Port-Channel mode lacp (active/active)
- activated cli « lacp rate fast » to physical Link of Port-Channel => because i have L2 provider fiber box.
12-05-2017 11:35 AM
Could you paste a diagram? Especially for the cross-stack devices.
12-05-2017 11:48 AM
Hello,
With both links are active what is the output of "show etherchannel 3 summary"from both switches?
With both links active what is the output of "show cdp neighbor" from both switches?
Also, without touching the physical ports, cut and paste the configs for the port-channel 3 interfaces into both switches. I say this just to make sure the physical interfaces acquire the proper configs. I have found that sometimes if you configure a physical interface and just add it to the port channel sometimes things get a little screwy and this just helps get things in line.
Regards
12-05-2017 01:05 PM - edited 12-05-2017 01:07 PM
When i check with "show etherchannel 3 summary" and "show cdp neighbor"on all switch, all output it's ok.
I i have test without port-channel configuration, with spanning-tree enable, it's ok, no problem the second link work fine if i disable the first link.
i have cut and past configuration but same problem
but i use "case RAD" for convert ethernet to fiber, it's a fulle L2 provider equipment, it's block nothing same as a direct optical fiber.
12-05-2017 01:31 PM
Please, send the following information:
For VSS:
For stacked switches:
12-05-2017 01:56 PM
actually, i can't to do the "sh" command.
You can seen the attach configuration.
Can you confirme that my vss configuration it's ok for 3850
stackwise-virtual
domain 101
!
interface TenGigabitEthernet1/0/45
stackwise-virtual dual-active-detection
!
interface TenGigabitEthernet1/0/47
stackwise-virtual link 1
!
interface TenGigabitEthernet1/0/48
stackwise-virtual link 1
!
interface TenGigabitEthernet2/0/45
stackwise-virtual dual-active-detection
!
interface TenGigabitEthernet2/0/47
stackwise-virtual link 1
!
interface TenGigabitEthernet2/0/48
stackwise-virtual link 1
12-06-2017 06:25 AM
Something in your VSS configuration doesn't convince me. Normally, when you are going to use 2 interfaces to build the VSS domain, a port-channel is required, but I don't see that in your configuration.
I'd say you will need to re-check the VSS configuration.
12-06-2017 06:28 AM
For 3850, no port Channel for VSS
12-06-2017 07:01 AM
Perhaps I am misunderstanding it, but read the section 'Multichassis EtherChannels', third paragraph, last phrase.
12-05-2017 09:09 PM
12-05-2017 10:45 PM
For vss: 16.6.2
for stack: 03.07.05E
12-06-2017 04:05 AM
@Gilles Dellaccio wrote:
For vss: 16.6.2
for stack: 03.07.05E
CSCve29061
Do not, under any circumstances, load 16.X because it is very, very unstable. If possible, stay with 3.6.X or 3.7.X.
12-07-2017 06:11 AM
I have found the resolve issue!
i havé upgrade remote stack with:
- upgrade to 16.6.2
- activated Port-Channel mode lacp (active/active)
- activated cli « lacp rate fast » to physical Link of Port-Channel => because i have L2 provider fiber box.
12-07-2017 06:13 AM
Thanks for sharing your solution.
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