Route advertisement method and related device
A first network device obtains a first route, where the first route includes a first route prefix. The first network device advertises a second route, where the second route includes a subnet prefix and a path identifier, and a range of the subnet prefix includes a range of the first route prefix.
1. A method, comprising:
obtaining, by a first network device, first routing information of a first route, wherein the first routing information comprises a first route prefix; and
advertising, by the first network device, second routing information of a second route, wherein the advertised second routing information comprises a subnet prefix and a path identifier, a range of the subnet prefix comprises a range of the first route prefix, the path identifier comprises a network slice identifier, the network slice identifier comprises a flexible algorithm identifier corresponding to a network slice, and the path identifier corresponds to a traffic engineering tunnel.
2. The method according to claim 1 , further comprising:
obtaining, by the first network device, third routing information of a third route, wherein the third routing information comprises a second route prefix; and
obtaining, by the first network device, the subnet prefix based on the second route prefix and the first route prefix.
3. The method according to claim 1 , wherein the second routing information is advertised by using an interior gateway protocol (IGP) packet.
4. The method according to claim 1 , wherein the first routing information is advertised by a second network device.
5. The method according to claim 4 , wherein the second network device and the first network device belong to different interior gateway protocol (IGP) domains.
6. An apparatus, comprising:
at least one processor; and
at least one non-transitory computer-readable storage medium storing a program to be executed by the at least one processor, the program including instructions to:
obtain first routing information, wherein the first routing information comprises a first route prefix; and
advertise second routing information, wherein the second routing information comprises a subnet prefix and a path identifier, a range of the subnet prefix comprises a range of the first route prefix, the path identifier comprises a network slice identifier, the network slice identifier comprises a flexible algorithm identifier corresponding to a network slice, and the path identifier corresponds to a traffic engineering tunnel.
7. The apparatus according to claim 6 , wherein the instructions further include instructions to:
obtain third routing information, wherein the third routing information comprises a second route prefix; and
obtain the subnet prefix based on the second route prefix and the first route prefix.
8. The apparatus according to claim 6 , wherein the second routing information is advertised by using an interior gateway protocol (IGP) packet.
9. The apparatus according to claim 6 , wherein the first routing information is advertised by a second network device.
10. A non-transitory storage medium storing a program, wherein when the program is executed by one or more processors, the execution causes the one or more processors to perform operations, the operations comprising:
obtaining first routing information, wherein the first routing information comprises a first route prefix; and
advertising second routing information, wherein the second routing information comprises a subnet prefix and a path identifier, a range of the subnet prefix comprises a range of the first route prefix, the path identifier comprises a network slice identifier, the network slice identifier comprises a flexible algorithm identifier corresponding to a network slice, and the path identifier corresponds to a traffic engineering tunnel.
11. The non-transitory storage medium according to claim 10 , wherein the operations further comprise:
obtaining third routing information, wherein the third routing information comprises a second route prefix; and
obtaining the subnet prefix based on the second route prefix and the first route prefix.
12. The non-transitory storage medium according to claim 10 , wherein the second routing information is advertised by using an interior gateway protocol (IGP) packet.
13. The non-transitory storage medium according to claim 10 , wherein the first routing information is advertised by a second network device.
14. The non-transitory storage medium according to claim 13 , wherein the second network device and a first network device to which the one or more processors are applied belong to different interior gateway protocol (IGP) domains.
15. The apparatus according to claim 9 , wherein the second network device and the apparatus belong to different interior gateway protocol (IGP) domains.
16. The apparatus according to claim 9 , wherein the second network device and the apparatus belong to different Border Gateway Protocol (BGP) domains.
17. The method according to claim 4 , wherein the second network device and the first network device belong to different Border Gateway Protocol (BGP) domains.
18. The non-transitory storage medium according to claim 13 , wherein the second network device and a first network device to which the one or more processors are applied belong to different Border Gateway Protocol (BGP) domains.
19. The method according to claim 1 , wherein the first network device maintains a mapping between a plurality of flexible algorithm identifiers and segment identifiers.