Method and apparatus for forwarding MPLS data packet
A method and an apparatus for forwarding an MPLS data packet are provided, which are used in an environment of hybrid networking of an SR network and a non-SR network. The method includes: when obtaining a to-be-sent MPLS data packet, a first SR router in an SR network determines whether a next-hop router supports an SR characteristic; the first SR router encapsulates the MPLS data packet into an IP tunnel when determining that the next-hop router does not support the SR characteristic, and sends an encapsulated MPLS data packet to the next-hop router to enable the encapsulated MPLS data packet to be forwarded, based on an IP routing table, to a second SR router. According to the application, correct forwarding of an MPLS data packet is completed in an environment of hybrid networking of an SR router and a non-SR router.
1. A method for sending a multiprotocol label switching (MPLS) data packet, the method comprising:
receiving, by a first segment routing (SR) router in an SR network, a tunnel encapsulation capability advertised by a second SR router;
determining, by the first SR router, an internet protocol (IP) tunnel encapsulation type according to the tunnel encapsulation capability;
encapsulating, by the first SR router, the MPLS data packet into an IP tunnel according to the IP tunnel encapsulation type; and
sending, by the first SR router, the encapsulated MPLS data packet to the second SR router.
2. The method according to claim 1 , wherein the tunnel encapsulation capability is advertised by the second SR router using an interior gateway protocol.
3. The method according to claim 1 , wherein the IP tunnel encapsulation type is a type of a header of an encapsulation IP tunnel.
4. The method according to claim 1 , wherein the second SR router support one or more IP tunnel encapsulation types.
5. The method according to claim 1 , wherein the tunnel encapsulation capability comprises an encapsulation capability sub-type-length-value (sub-TLV).
6. The method according to claim 5 , wherein a type field of the encapsulation capability sub-TLV is filled in with a type code of an IP tunnel encapsulation format allocated by an internet assigned numbers authority.
7. A first segment routing (SR) router comprising:
a receiver configured to cooperate with a processor to receive a tunnel encapsulation capability advertised by a second SR router;
the processor configured to determine an internet protocol (IP) tunnel encapsulation type according to the tunnel encapsulation capability, and encapsulate a multiprotocol label switching (MPLS) data packet into an IP tunnel according to the IP tunnel encapsulation type; and
a transmitter configured to cooperate with the processor to send the encapsulated MPLS data packet to the second SR router.
8. The first SR router according to claim 7 , wherein the tunnel encapsulation capability is advertised by the second SR router using an interior gateway protocol.
9. The first SR router according to claim 7 , wherein the IP tunnel encapsulation type is a type of a header of an encapsulation IP tunnel.
10. The first SR router according to claim 7 , wherein the second SR router support one or more IP tunnel encapsulation types.
11. The first SR router according to claim 7 , wherein the tunnel encapsulation capability comprises an encapsulation capability sub-type-length-value (sub-TLV).
12. The first SR router according to claim 11 , wherein a type field of the encapsulation capability sub-TLV is filled in with a type code of an IP tunnel encapsulation format allocated by an internet assigned numbers authority.
13. A non-transitory computer readable medium, comprising processor-executable instructions which when executed by a processor of a first segment routing (SR) router in an SR network, causes the first SR router to implement the following method for sending a multiprotocol label switching (MPLS) data packet:
receiving a tunnel encapsulation capability advertised by a second SR router;
determining an internet protocol (IP) tunnel encapsulation type according to the tunnel encapsulation capability;
encapsulating the MPLS data packet into an IP tunnel according to the IP tunnel encapsulation type; and
sending the encapsulated MPLS data packet to the second SR router.
14. The non-transitory computer readable medium according to claim 13 , wherein the tunnel encapsulation capability is advertised by the second SR router using an interior gateway protocol.
15. The non-transitory computer readable medium according to claim 13 , wherein the IP tunnel encapsulation type is a type of a header of an encapsulation IP tunnel.
16. The non-transitory computer readable medium according to claim 13 , wherein the second SR router support one or more IP tunnel encapsulation types.
17. The non-transitory computer readable medium according to claim 13 , wherein the tunnel encapsulation capability comprises an encapsulation capability sub-type-length-value (sub-TLV).
18. The non-transitory computer readable medium according to claim 17 , wherein a type field of the encapsulation capability sub-TLV is filled in with a type code of an IP tunnel encapsulation format allocated by an internet assigned numbers authority.