Ethernet virtual private network attachment circuit aware virtual local area network bundle service

A first network device, comprising:

• a processor;
• and
• a memory containing a program that, when executed by the processor, performs an operation comprising:
• receiving a multicast packet from a second network device, wherein:
• the first network device comprises an integrated routing and bridging (IRB) interface comprising a bridge domain comprising a plurality of subnets;
• the multicast packet is received on a first subnet of the plurality of subnets within the bridge domain of the IRB interface at the first network device;
• and
• each subnet of the plurality of subnets within the bridge domain is associated with a different virtual local area (VLAN) identifier;
• determining attachment circuit (AC) information associated with the multicast packet;
• generating an information element that includes an advertisement route that includes an Ethernet tag field, wherein the Ethernet tag field includes an indication of the AC information, wherein the AC information comprises the VLAN identifier associated with the first subnet of the plurality of subnets within the bridge domain at the first network device;
• generating an extended community comprising a predefined value that indicates that the Ethernet tag field comprises the indication of the AC information, wherein the information element further comprises the extended community;
• and
• transmitting the information element to a third network device.

A computer-implemented method, comprising:

• receiving, at a first network device, a first packet from a second network device, wherein:
• the first packet comprises an information element that includes (i) an advertisement route that includes an Ethernet tag field and (ii) an extended community;
• the first network device comprises a plurality of bridge domains;
• each of the plurality of bridge domains comprises a plurality of subnets;
• and
• for each of the plurality of bridge domains, each of the plurality of subnets within the bridge domain is associated with a different virtual local area network (VLAN) identifier;
• upon determining, by the first network device, that a first field in the extended community includes a predefined value:
• determining, by the first network device, that the Ethernet tag field in the advertisement route includes attachment circuit (AC) information associated with the first packet, wherein the predefined value indicates that the Ethernet tag field comprises an indication of the AC information;
• and
• updating, by the first network device, a forwarding table at the first network device with the AC information, wherein the AC information comprises an indication of the VLAN identifier associated with a first subnet of the plurality of subnets within a first bridge domain associated with the first packet.