The Link-Discriminator option informs the receiver of a Link-Drop-Query-Request which link will be dropped.
| Type | A one-octet field that indicates the type of BAP datagram option. For Link-Discriminator, the type is 05. |
| Length | A one-octet field that indicates the length of this BAP option, including Type, Length, and Link-Discriminator. |
| Link-Discriminator | A two-octet field that contains the Link-Discriminator that was contained in the LCP Link-Discriminator configuration option sent by the receiver of the packet. |