Automatic suppression or unsuppression of routes in an ethernet virtual private network (evpn) data center interconnect (dci) network

A system in an Ethernet Virtual Private Network (EVPN) Data Center Interconnect (DCI) Network using Unknown MAC Route (UMR), comprising:

• a gateway coupled to a PE device in a first data center, the gateway adapted for:
• receiving a first route advertising message specifying a MAC/IP address and a first path for the MAC/IP address associated with the MAC/IP address at the PE, and wherein the gateway has suppressed remote paths for the MAC/IP address in the first data center;
• determining a conflict between the first path for the MAC/IP address as received in the first route advertisement message and a second path for the MAC/IP address as stored in MAC data at the gateway;
• determining remote paths for the MAC/IP address are suppressed at the gateway;
• and
• unsuppressing remote paths for the MAC/IP address at the gateway;
• and
• sending a second route advertisement for the MAC/IP address in the first data center, wherein the second route advertisement message specifies a third path for the MAC/IP address and the third path comprises at least the first path.

A non-transitory computer readable medium, comprising instructions for:

• receiving a first route advertising message from a remote data center at a gateway of a first data center in an Ethernet Virtual Private Network (EVPN) Data Center Interconnect (DCI) Network using Unknown MAC Route (UMR), wherein the first route advertising message specifies a MAC/IP address, a first sequence number, and a remote path associated with the remote data center;
• storing the first sequence number and the remote path in association with the MAC/IP address;
• suppressing remote paths for the MAC/IP address in the first data center;
• receiving a second route advertising message from a Provider Edge (PE) device at the gateway, wherein the PE device is in the first data center of the gateway and the second route advertising message specifies the MAC/IP address, a second sequence number of zero, and a local path;
• determining, at the gateway, that the stored first path for the MAC/IP address is the remote path and the second path as received in the second route advertisement message is the local path;
• and
• unsuppressing remote paths for the MAC/IP at the gateway;
• and
• sending a third route advertisement for the MAC/IP address in the first data center, wherein the third route advertisement message specifies a third path for the MAC/IP address, the third path including the remote path.