Is MAC flapping expected between VPC peer-link and VPC member port?

[matant13]

Hi,

I have two Cisco Nexus switches that are configured with VPC in following topology:

What will happen in case the client will send a lot of broadcast packets from both of his links (load-sharing bond) that have the same source MAC address (e.g. 00:1b:12:34:45:78) to Cisco Nexus A and Cisco Nexus B member ports?

Cisco Nexus A will forward the broadcast packets to Cisco Nexus B via the peer-link, right?

If so, is MAC flapping expected to occur on Cisco Nexus B peer-link and VPC member port B?

Is it a problem? (e.g. log flooding, communication issues etc.)

Does VPC has a mechanism that prevents this MAC flapping? How?

Thanks,

Matan 

[MHM Cisco World]

why the NSK detect mac flapping ?
the MAC will add as following 
VLAN-PO ""to clint"" -MAC 
the NSK will not learn MAC through the peer-link, dont worry.

[matant13]

What is NSK?
So MAC flapping will not occur?
Can you explain why the  client MAC address will not be associated with the peer-link port even though a packet with the client source MAC was received by Cisco B peer link port?

The switch knows that member port B is up and is already associated with this MAC address and therefore will avoid re-associating the client MAC address to the peer-link port? 

[MHM Cisco World]

the NSK is mark any MAC address learn from Peer-Link for vPC VLAN with ""+"" this use as indication that this MAC is receive from NSK Peer and forward to this NSK via Peer-link. 
there is no mac flapping 

NSK meaning nexus