Dynamic mac from GigabitEthernet2 conflict with WlClient

[secElh]

hi.. 

i'm getting the following error 

%SWPORT-4-MAC_CONFLICT: Chassis 1 F0: cpp_cp_svr: Dynamic mac B827.EB64.23F0 from GigabitEthernet2 conflict with WlClient, please check the network topology and make sure there is no loop.QFP:0.0 Thread:000 TS:00000006079705458006

but the device is still able to connect to ssid, i'm using a virtual controller that has the AP's on the same vlan as the gi2 

it's a simple setup, we have other catalyst controller in different version on different vlans where each vlan also has the ap's meant for that controller (it's  a lap setup) 

in recent catalyst versions 17.12+ we had to make additional flex configuration to make the devices join the ssid, and i'm not sure why that was needed. 

!
interface GigabitEthernet1
 no switchport
 ip address 192.168.64.96 255.255.255.0
 negotiation auto
!
interface GigabitEthernet2
 switchport access vlan 107
 switchport mode access
 negotiation auto
!
interface GigabitEthernet3
 negotiation auto
!
interface Vlan1
 no ip address
!
interface Vlan107
 ip address 192.168.107.61 255.255.255.0
!
ip forward-protocol nd
ip forward-protocol udp
ip http server
ip http authentication local
ip http secure-server
!
ip route 0.0.0.0 0.0.0.0 GigabitEthernet1 192.168.64.1
ip ssh bulk-mode 131072
ip ssh rsa keypair-name ssh-key
ip scp server enable

wireless profile flex default-flex-profile
description "default flex profile"
ip http client proxy 0.0.0.0 0
native-vlan-id 107
vlan-name VLAN0107
vlan-id 107

[balaji.bandi]

Not sure you hitting with Bug, (since you are 17.12 that should fix the issue)

check some workaround, also try moving to different VLAN

https://bst.cisco.com/bugsearch/bug/CSCvt96686

still issue contact TAC for suggest.

[secElh]

my main question is why did we need to configure flex profile to have vlan translation from id to name and change the native vlan from 1 to vlan id ? (in the past we didn't need to) 

[MHM Cisco World]

This C1000 SW?

MHM

[secElh]

no , virtual cisco catalyst 9800 17.18.1

[MHM Cisco World]

https://quickview.cloudapps.cisco.com/quickview/bug/CSCvt96686 

It bug as Other suggest.

MHM

[MHM Cisco World]

""If there is another wireless controller in the network running in parallel with 9800, shut it down. Messages should stop appearing.""

MHM

[secElh]

there are like 3 or 4 of those controllers but each one has their own ssid and their own vlan. 

[MHM Cisco World]

Their own Vlan, you meaning each wlc have it wmi in different vlan?

MHM

[secElh]

yes. i have 17.9.4 catalyst on vlan-70 , 17.18.1 on vlan-107 , another on vlan-108, each one's gi2 port is on an svi for that vlan

however their gi1 is all on the same vlan of 64 and they all have this.  

ip route 0.0.0.0 0.0.0.0 GigabitEthernet1 192.168.64.1

[MHM Cisco World]

Each WLC have it vlan but use same subnet ?

MHM

[secElh]

in our case a vlan is same as subnet meaning 

WLC x has 2 interfaces 

gi1 out of band, has static IP, is connected to vlan-64 , has static ip 192.168.64.1

gi2 WMI has an svi connected to either vlan107,vlan108,vlan70 (which would be 192.168.107.x,192.168.108.x,192.168.70.x)  depending on the WLC and each of those vlans would have ap's which are meant only for that WLC, the reason i did it this way, is because i wanted to have quickest way to each ap to discover their respective WLC without resorting to IT requests to change something in the DHCP, we can drop and create those controllers to test each version.