Mass mac withdrawal for evpn-dci using virtual esi

A method comprising:

• receiving, by a provider edge (PE) network device and from another PE network device in an Ethernet virtual private network data center interconnect (EVPN DCI), a virtual Ethernet segment identifier (vESI) that comprises a plurality of top-of-rack Ethernet segment identifier (TOR-ESI) values that represent a plurality of Ethernet segments coupled to a top-of-rack (TOR) switch that is coupled to the another PE network device, wherein each of the plurality of Ethernet segments comprises one or more media access control (MAC) addresses associated with a respective one of the plurality of Ethernet segments;
• learning, by the PE network device, the one or more MAC addresses associated with each of the plurality of Ethernet segments, wherein the one or more MAC addresses are advertised with one of the plurality of TOR-ESI values that represents the respective one of the plurality of Ethernet segments;
• receiving, by the PE network device and from the another PE network device, an updated vESI, wherein an unreachable one of the plurality of Ethernet segments coupled to the TOR switch is absent from the updated vESI;
• and
• removing, by the PE network device, MAC routes having the one of the plurality of TOR-ESI values that represents the unreachable one of the plurality of Ethernet segments based on the updated vESI.

A provider edge (PE) network device comprising:

• a control unit having at least one processor coupled to memory, wherein the control unit executes software configured to establish an Ethernet virtual private network data center interconnect (EVPN DCI);
• an interface that connects the PE network device to a top-of-rack (TOR) switch;
• and
• a routing engine configured to:
• configure a virtual Ethernet segment identifier (vESI) that comprises a plurality of top-of-rack Ethernet segment identifier (TOR-ESI) values that represent a plurality of Ethernet segments coupled to the TOR switch, wherein each of the plurality of Ethernet segments comprises one or more media access control (MAC) addresses associated with a respective one of the plurality of Ethernet segments;
• advertise the vESI that comprises the plurality of TOR-ESI values to another PE network device in the EVPN DCI;
• receive a withdraw request from the TOR switch to withdraw one of the plurality of TOR-ESI values that represents an unreachable one of the plurality of Ethernet segments coupled to the TOR switch;
• and
• remove the one of the plurality of TOR-ESI values from the vESI to form an updated vESI, wherein the routing engine is configured to remove MAC routes having the one of the plurality of TOR-ESI values that represents the unreachable one of the plurality of Ethernet segments coupled to the TOR switch.

A provider edge (PE) network device comprising:

• a control unit having at least one processor coupled to memory, wherein the control unit executes software configured to establish an Ethernet virtual private network data center interconnect (EVPN DCI);
• an interface that connects the PE network device to another PE network device in the EVPN DCI;
• and
• a routing engine configured to:
• receive a virtual Ethernet segment identifier (vESI) from the another PE network device in the EVPN DCI, the vESI comprising a plurality of top-of-rack Ethernet segment identifier (TOR-ESI) values that represent a plurality of Ethernet segments coupled to a top-of-rack (TOR) switch that is coupled to the another PE network device, wherein each of the plurality of Ethernet segments comprises one or more media access control (MAC) addresses associated with a respective one of the plurality of Ethernet segments;
• learn the one or more MAC addresses associated with each of the plurality of Ethernet segments, wherein the one or more MAC addresses are advertised with one of the plurality of TOR-ESI values that represents the respective one of the plurality of Ethernet segments;
• receive an updated vESI from the another PE device, wherein an unreachable one of the plurality of Ethernet segments coupled to the TOR switch is absent from the updated vESI;
• and
• remove MAC routes having the one of the plurality of TOR-ESI values that represents the unreachable one of the plurality of Ethernet segments based on the updated vESI.