Segment routing using a remote forwarding adjacency identifier
AssigneeCisco Technology, Inc.
InventorsStefano B. Previdi, Clarence Filsfils
Life of this patent
Estimating the term…
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.
Claims20
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 between the first node and the destination node.
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.
A 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:
- 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 between the first node and the destination node.
A system comprising:
- 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 between the first node and the destination node.
Dependencies are inferred from the claim text.