bgp evpn gateway mac address advertise to remote VTEP issue

[laweschan]

Hi,

may I know is that any method to prevent local gateway ip-mac address to distribute or learned by remote VTEP ?

Background:
   I have 2 sites building bgp evpn, using same VLAN and VNI to link up each others.
   said SiteA and SiteB for example, SiteA and SiteB has its own gateway but with same ip address.

Problem: 
            everything work fine for few days or week but suddenly I found routing to local VLAN in siteB not work, after checked I found that siteA gateway mac address will advertise to siteB VTEP and siteB host may get incorrect mac address for the gateway ip.

thanks

Regards,
Lawes