Label distribution protocol over segment routing
First Claim
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1. A method comprising:
- receiving a packet at a hybrid node, whereina first label distribution protocol (LDP) label is attached to the packet,the first LDP label is advertised using LDP, andthe hybrid node employs LDP and segment routing (SR) in a control plane implemented by the hybrid node;
detaching the first LDP label from the packet;
attaching a segment identifier (ID) to the packet after the first LDP label is detached, whereinthe segment ID is advertised using a protocol other than LDP; and
forwarding the packet with the attached segment ID on a path towards a segment routing (SR) enabled node, whereinthe path comprises a first SR enabled node,the first SR enabled node employs SR and lacks LDP in a control plane implemented by the first SR enabled node, andthe SR enabled node is uniquely assigned the segment ID.
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Abstract
A method and apparatus for forwarding packets through a network domain that contains nodes that are label distribution protocol (LDP) enabled and nodes that are segment routing (SR) enabled. In one embodiment, the method may include a network node receiving a packet with a label attached thereto. The node swaps the label with a segment identifier (ID). The node then forwards the packet to an SR node. In another embodiment, the method may include a network node receiving a packet with a segment ID attached thereto. The node swaps the segment ID with a label. The node then forwards the packet to an LDP enabled node.
142 Citations
19 Claims
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1. A method comprising:
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receiving a packet at a hybrid node, wherein a first label distribution protocol (LDP) label is attached to the packet, the first LDP label is advertised using LDP, and the hybrid node employs LDP and segment routing (SR) in a control plane implemented by the hybrid node; detaching the first LDP label from the packet; attaching a segment identifier (ID) to the packet after the first LDP label is detached, wherein the segment ID is advertised using a protocol other than LDP; and forwarding the packet with the attached segment ID on a path towards a segment routing (SR) enabled node, wherein the path comprises a first SR enabled node, the first SR enabled node employs SR and lacks LDP in a control plane implemented by the first SR enabled node, and the SR enabled node is uniquely assigned the segment ID. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An apparatus comprising:
a hybrid node, wherein the hybrid node is configured to; receive packets with an attached first label distribution protocol (LDP) label, wherein the first LDP label is advertised using LDP, and the hybrid node employs LDP and segment routing (SR) in a control plane implemented by the hybrid node; detach the first LDP label from the packets; attach a segment identifier (ID) to the packets after the first LDP label is detached, wherein the segment ID is advertised using a protocol other than LDP; and forward the packets with the attached segment ID towards a SR enabled node on a path, wherein the path comprises a first SR enabled node, the first SR enabled node employs SR and lacks LDP in a control plane implemented by the first SR enabled node, and the SR enabled node is uniquely assigned the segment ID. - View Dependent Claims (11, 12, 13, 14, 15)
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16. A memory storing executable instructions, wherein a node is configured to implement a method in response to executing the instructions, the method comprising:
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receiving a packet at a hybrid node, wherein a first label distribution protocol (LDP) label is attached to the packet, the first LDP label is advertised using LDP, and the hybrid node employs LDP and segment routing (SR) in a control plane implemented by the hybrid node; detaching the first LDP label from the packet; attaching a segment identifier (ID) to the packet after the first LDP label is detached, wherein the segment ID is advertised using a protocol other than LDP; and forwarding the packet with the attached segment ID on a path towards a segment routing (SR) enabled node, wherein the path comprises a first SR enabled node, the first SR enabled node employs SR and lacks LDP in a control plane implemented by the first SR enabled node, and the SR enabled node is uniquely assigned the segment ID. - View Dependent Claims (17, 18, 19)
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Specification