Segment routing using a remote forwarding adjacency identifier
First Claim
Patent Images
1. A method comprising:
- a first node generating a first segment identifier (ID);
the first node mapping the first segment ID to a label distribution protocol (LDP) label in memory;
the first node generating and sending an advertisement message to other nodes in a network of nodes, wherein the advertisement message comprises an identity of a destination node and the first segment ID;
wherein the LDP label corresponds to an LDP tunnel that exists between the first node and the destination node when the first node sends the advertisement.
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Abstract
Disclosed is an apparatus and method for segment routing using a remote forwarding adjacency identifier. In one embodiment, a first node in a network receives a packet, wherein the packet is received with a first segment-ID and another segment ID attached thereto. The first node detaches the first and the other segment IDs from the packet. Then the first node attaches a first label to the packet. Eventually, the first node forwards the packet with the attached first label directly to a second node in the network. In one embodiment, the other segment ID corresponds to a forwarding adjacency or tunnel label switched path between the first node and another node.
195 Citations
20 Claims
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1. A method comprising:
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a first node generating a first segment identifier (ID); the first node mapping the first segment ID to a label distribution protocol (LDP) label in memory; the first node generating and sending an advertisement message to other nodes in a network of nodes, wherein the advertisement message comprises an identity of a destination node and the first segment ID; wherein the LDP label corresponds to an LDP tunnel that exists between the first node and the destination node when the first node sends the advertisement. - View Dependent Claims (2, 3, 4, 5, 6, 8)
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7. The method of 1 wherein the first node comprises a memory that maps nodal segment IDs to identities of nodes in the network, wherein the first node generates the first segment ID in response to a determination that the memory does not map the identity of the destination to a segment ID.
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9. A non-transitory computer readable memory (CRM) storing instructions, wherein a first node is capable of implementing a method in response to executing the instructions, the method comprising:
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generating a first segment identifier (ID); mapping the first segment ID to a label distribution protocol (LDP) label in memory; generating and sending an advertisement message to other nodes in a network of nodes, wherein the advertisement message comprises an identity of a destination node and the first segment ID; wherein the LDP label corresponds to an LDP tunnel that exists between the first node and the destination node when the first node sends the advertisement. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17)
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18. A system comprising:
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a first node coupled to a second node; wherein the second node configured to generate and send a label distribution protocol (LDP) label to the first node; wherein the first node is configured to generate a first segment identifier (ID); wherein the first node is configured to map the first segment ID to the LDP label in memory in response to receiving the LDP label from the second node; wherein the first node is configured to generate and send an advertisement message to other nodes in a network of nodes, wherein the advertisement message comprises an identity of a destination node and the first segment ID; wherein the LDP label corresponds to an LDP tunnel that exists between the first node and the destination node when the first node sends the advertisement. - View Dependent Claims (19, 20)
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Specification