Patent attributes
A route advertisement method is applied to a network in which a cross-domain end-to-end tunnel carries a service. The cross-domain end-to-end tunnel crosses at least two Interior Gateway Protocol (IGP) network domains, and the at least two IGP network domains include a first network device, a second network device, and a third network device. The route advertisement method includes receiving, by the first network device, Border Gateway Protocol (BGP) service routing information from the second network device, where the BGP service routing information includes a destination address and a next-hop address to the destination address, skipping, by the first network device, performing route recursion on the next-hop address, and advertising, by the first network device, the BGP service routing information to the third network device.