Route generation method and device

Abstract

This application provides a route generation method, applied to an SRv6 network and including: receiving, by a first network device, a first notification packet from a second network device; where the first notification packet includes a network slice identifier, the first notification packet indicates an association relationship between information of the network slice identifier and an IPv6 address prefix of the second network device, and the network slice identifier is used to identify one network slice; and generating, by the first network device, a route forwarding entry for the IPv6 address prefix of the second network device based on an association relationship between the network slice identifier and the IPv6 address prefix of the second network device. This helps implement a network slice and resource isolation in the SRv6.

What is claimed is: 
     
         1 . A route generation method by a first network device in an Internet protocol version 6 (IPv6)-based segment routing over an IPv6 data plane (SRv6) network, wherein the method comprises:
 receiving a first notification packet from a second network device, that includes a network slice identifier that identifies one network slice and indicates an association relationship between information of the network slice identifier and an IPv6 address prefix of the second network device; and   generating a route forwarding entry for the IPv6 address prefix of the second network device based on an association relationship between the network slice identifier and the IPv6 address prefix of the second network device.   
     
     
         2 . The method according to  claim 1 , wherein the method further comprises:
 obtaining the network slice identifier and an IPv6 address prefix of the first network device, and generating a second notification packet; and   sending the second notification packet to the second network device, wherein the second notification packet comprises the network slice identifier, and the second notification packet indicates an association relationship between the information of the network slice identifier and the IPv6 address prefix of the first network device.   
     
     
         3 . The method according to  claim 1 , wherein the first notification packet is an intermediate system to intermediate system (ISIS) protocol link state protocol data unit (LSPDU) message, the LSPDU message comprises the network slice identifier, and the LSPDU message indicates the association relationship between the information of the network slice identifier and the IPv6 address prefix of the second network device. 
     
     
         4 . The method according to  claim 3 , wherein the LSPDU message comprises an IPv6 reachable type-length-value (TLV) field, the IPv6 reachable TLV field comprises a prefix field and a sub-type-length-value (sub-TLV) field, the prefix field is used to carry the IPv6 address prefix of the second network device, and the sub-TLV field is used to carry the network slice identifier. 
     
     
         5 . The method according to  claim 1 , wherein the first notification packet is an interior gateway protocol (IGP) notification message, the notification message comprises an SRv6 segment identifier (SID), the SID comprises a locator part, the locator part comprises the network slice identifier, and the locator part indicates the association relationship between the information of the network slice identifier and the IPv6 address prefix of the second network device. 
     
     
         6 . The method according to  claim 5 , wherein the locator part comprises the network slice identifier and the IPv6 address prefix of the second network device. 
     
     
         7 . A notification packet sending method by a second network device in an Internet protocol version 6 (IPv6) based segment routing over an IPv6 data plane (SRv6) network, wherein the method comprises:
 obtaining a network slice identifier and an IPv6 address prefix of the second network device, and generating a first notification packet; and   sending the first notification packet to a first network device, wherein the first notification packet comprises the network slice identifier, the first notification packet indicates an association relationship between information of the network slice identifier and the IPv6 address prefix of the second network device, and the network slice identifier is used to identify one network slice.   
     
     
         8 . A first network device, comprises:
 a transceiver, configured to receive a first notification packet from a second network device, wherein the first notification packet comprises a network slice identifier, the first notification packet indicates an association relationship between information of the network slice identifier and an Internet protocol version 6 (IPv6) address prefix of the second network device, and the network slice identifier is used to identify one network slice; and   a processor, configured to generate a route forwarding entry for the IPv6 address prefix of the second network device based on an association relationship between the network slice identifier and the IPv6 address prefix of the second network device.   
     
     
         9 . The network device according to  claim 8 , wherein
 the processor is further configured to: obtain the network slice identifier and an IPv6 address prefix of the first network device, and generate a second notification packet; and   the transceiver is further configured to send the second notification packet to the second network device, wherein the second notification packet comprises the network slice identifier, and the second notification packet indicates an association relationship between the information of the network slice identifier and the IPv6 address prefix of the first network device.   
     
     
         10 . The network device according to  claim 8 , wherein the first notification packet is an intermediate system to intermediate system (ISIS) protocol link state protocol data unit (LSPDU) message, the LSPDU message comprises the network slice identifier, and the LSPDU message indicates the association relationship between the information of the network slice identifier and the IPv6 address prefix of the second network device. 
     
     
         11 . The network device according to  claim 10 , wherein the LSPDU message comprises an IPv6 reachable type-length-value (TLV) field, the IPv6 reachable TLV field comprises a prefix field and a sub-type-length-value (sub-TLV) field, the prefix field is used to carry the IPv6 address prefix of the second network device, and the sub-TLV field is used to carry the network slice identifier. 
     
     
         12 . The network device according to  claim 8 , wherein the first notification packet is an interior gateway protocol (IGP) notification message, the notification message comprises an segment routing over an IPv6 data plane (SRv6) segment identifier (SID), the SID comprises a locator part, the locator part comprises the network slice identifier, and the locator part indicates the association relationship between the information of the network slice identifier and the IPv6 address prefix of the second network device. 
     
     
         13 . The network device according to  claim 12 , wherein the locator part comprises the network slice identifier and the IPv6 address prefix of the second network device. 
     
     
         14 . A second, comprises:
 a processor, configured to: obtain a network slice identifier and an IPv6 address prefix of the second network device, and generate a first notification packet; and   a transceiver, configured to send the first notification packet to a first network device, wherein the first notification packet comprises the network slice identifier, the first notification packet indicates an association relationship between information of the network slice identifier and the IPv6 address prefix of the second network device, and the network slice identifier is used to identify one network slice.