Reducing traffic loss during link failure in an ethernet virtual private network multihoming topology

A first network device, comprising:

• one or more memories;
• and
• one or more processors to:
• provide a first message to a second network device,
• wherein the first message includes a first bidirectional forwarding detection (BFD) discriminator associated with a first link between the first network device and a third network device, the first BFD discriminator including information identifying the first link and a state of the first link, and
• wherein the first network device, the second network device, and the third network device are included in a network;
• receive a second message from the second network device,
• wherein the second message includes a second BFD discriminator associated with a second link between the second network device and the third network device, the second BFD discriminator including information identifying the second link and a state of the second link;
• permit a BFD session between the first network device and the second network device based on the first BFD discriminator and the second BFD discriminator;
• detect a link failure associated with the first link between the first network device and the third network device;
• and
• provide, via the BFD session, a BFD message to the second network device,
• wherein the BFD message includes an indication of the link failure, and
• wherein the BFD message is to cause the second network device to be a designated forwarder for the third network device.

A non-transitory computer-readable medium storing instructions, the instructions comprising:

• one or more instructions that, when executed by one or more processors of a first network device, cause the one or more processors to:
• permit a bidirectional forwarding detection (BFD) session with a second network device,
• wherein the first network device is a designated forwarder for a third network device,
• wherein a first link is provided between the first network device and the third network device,
• wherein the second network device is a backup designated forwarder for the third network device,
• wherein a second link is provided between the second network device and the third network device, and
• wherein the first network device, the second network device, and the third network device are included in a network;
• provide a first advertisement message to the second network device,
• wherein the first advertisement message includes a first BFD discriminator associated with the first link between the first network device and a third network device, the first BFD discriminator including information identifying the first link and a state of the first link;
• receive a second advertisement message from the second network device,
• wherein the second advertisement message includes a second BFD discriminator associated with the second link between the second network device and the third network device, the second BFD discriminator including information identifying the second link and a state of the second link;
• detect a link failure associated with the first link between the first network device and the third network device;
• and
• provide, via the BFD session, a BFD message to the second network device,
• wherein the BFD message includes an indication of the link failure, and
• wherein the BFD message is to cause the second network device to be a new designated forwarder for the third network device.