Abstract: A data transmission method, a node, and a system, the method including receiving, by a forwarding node, a data packet, where a label stack of the data packet comprises a path identifier (path-ID), where the path-ID is an identifier of a constrained path, and where the constrained path is a path that consists of at least two nodes arranged in a specific order, determining, by the forwarding node, that the forwarding node is a node on the constrained path, selecting, by the forwarding node, a target label/target address from a local available label block/address block according to the path-ID and according to a preset rule, where the label block/address block comprises at least one label/address, searching for, by the forwarding node, a corresponding target interface according to the target label/target address, and forwarding, by the forwarding node, the data packet through the target interface.

Abstract: The present disclosure provides a packet processing method, including: determining, by a first node, a first packet, where both a packet header and a segment routing header (SRH) of the first packet include a shared SID, the shared SID includes a first address identifier and a first function identifier, the first address identifier is used to identify address information of a terminating node, and the first function identifier is used to identify a same first function that needs to be performed by at least two nodes. If a plurality of nodes need to perform the same first function, the shared SID in the SRH can replace SIDs of all of the plurality of nodes. In this way, SID overheads can be reduced to save bandwidth resources, thereby helping improve system performance.

Abstract: This application discloses a communication method and a related device. The communication method includes: A first in-domain device determines an address length, where the “in-domain” refers to being in a local area network. Then, the first in-domain device receives a data packet, and extracts an address from the data packet based on the address length. Further, the first in-domain device forwards the data packet based on the address.

Abstract: The present disclosure provides a packet processing method, including: determining, by a first node, a first packet, where both a packet header and a segment routing header (SRH) of the first packet include a shared SID, the shared SID includes a first address identifier and a first function identifier, the first address identifier is used to identify address information of a terminating node, and the first function identifier is used to identify a same first function that needs to be performed by at least two nodes. If a plurality of nodes need to perform the same first function, the shared SID in the SRH can replace SIDs of all of the plurality of nodes. In this way, SID overheads can be reduced to save bandwidth resources, thereby helping improve system performance.

Abstract: A data transmission method, a node, and a system, the method including receiving, by a forwarding node, a data packet, where a label stack of the data packet comprises a path identifier (path-ID), where the path-ID is an identifier of a constrained path, and where the constrained path is a path that consists of at least two nodes arranged in a specific order, determining, by the forwarding node, that the forwarding node is a node on the constrained path, selecting, by the forwarding node, a target label/target address from a local available label block/address block according to the path-ID and according to a preset rule, where the label block/address block comprises at least one label/address, searching for, by the forwarding node, a corresponding target interface according to the target label/target address, and forwarding, by the forwarding node, the data packet through the target interface.