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Factory Network - Profinet - MAC Flapping

Niklas.D
Beginner
Beginner

Hi

 

So we are building a new factory network. 

And we want to use our Cisco network for the IO traffic. 

 

The problems come when we are trying to to connect the ABB IO useing Profinet
The IO needs two uplinks. So we have a ring and useing REP, and 2 Switches IE-2000 switches for every ABB-IO and from every ABB-IO two links.

We put Link 1 in Switch 1 interface fa1/1 and

Link 2 in Switch 2 Interface fa1/2
Switch 1 fa1/1 vlan 401 Connected ->IO 1

Switch 1 fa1/2 vlan 402 Connected ->IO 3

Switch 2 fa1/1 vlan 401 Connected ->IO 2
Switch 2 fa1/2 vlan 402 Connected ->IO 1

Switch 3 fa1/1 vlan 401 Connected -> IO 3

Switch 3 fa1/2 vlan 402 Connected ->IO 2

 

 

But then we get flapping via the Uplinks

Feb 17 17:00:53.541 MET: %SW_MATM-4-MACFLAP_NOTIF: Host f08e.dbe8.2702 in vlan 401 is flapping between port Gi1/1 and port Fa1/1
MOITXTEST02#
Feb 17 17:00:59.690 MET: %SW_MATM-4-MACFLAP_NOTIF: Host 0000.2331.3199 in vlan 402 is flapping between port Gi1/1 and port Gi1/2
MOITXTEST02#
Feb 17 17:01:32.406 MET: %CDP-4-NATIVE_VLAN_MISMATCH: Native VLAN mismatch discovered on FastEthernet1/1 (401), with MOITXTEST03.vaverket.local FastEthernet1/2 (402).

 

Should not the vlan tag seperate them? so they could not see eachother?

This is all in a LAB so far, and we got a bit stunded on the network side that the IO is useing the same MAC on both interfaces.

3 Replies 3

Reza Sharifi
Hall of Fame Master Hall of Fame Master
Hall of Fame Master

Hi,

Can you put both interfaces to the same switch in the same vlan and test?

 

Switch 1 fa1/1 vlan 401 Connected ->IO 1

Switch 1 fa1/2 vlan 401 Connected ->IO 3

Also, is there a way for the end device to be configured with high availability using both NICs?

HTH

Hi Reza.

 

If i put them in the same Switch the Ide of losing one switch is lost.

So i could do that but the design dont allow it! 

 

Maybe it can, that is one ide the automation engineer are looking in to. that would be the easy way but from working with ABB, they are useing 10 Mbits interfaces 2020 i would not get my hopes up! 

 

Hi,

10 Mbits interfaces 2020 i would not get my hopes up! 

OMG, 10 Mbps in 2021?

 

Ok, how about 2 different switches but the same vlan like this?

Switch 1 fa1/2 vlan 401 Connected ->IO 3

Switch 3 fa1/1 vlan 401 Connected -> IO 3

Assuming IO 3 is one device.

HTH

 

 

 

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