Abstract: A method and an apparatus for processing a modified packet. A first routing device obtains a first packet sent by a second routing device, where the first packet carries a first correspondence, creates a forwarding entry that includes the first correspondence, receives a modified packet and determines an ID of a destination service function (SF) of the modified packet, queries the forwarding entry according to the ID of the destination SF, and determines that an SF identified by the ID of the destination SF is an SF connected to a second routing device, and forwards the modified packet to the second routing device.

Abstract: A method and an apparatus for processing a low-latency service flow, where the method includes that a first forwarding device obtains a low latency identifier corresponding to a first service flow, and obtains a second data packet based on the first data packet and the low latency identifier after determining that a received first data packet belongs to the first service flow, where the second data packet includes the first data packet and the low latency identifier, the low latency identifier instructing a forwarding device that receives the first service flow to forward the first service flow in a low-latency forwarding mode, and the low-latency forwarding mode is a mode in which fast forwarding of the first service flow is implemented under dynamic control, and the first forwarding device sends the second data packet to a second forwarding device in the low-latency forwarding mode.

Abstract: A method for generating forwarding information includes determining, by a controller, a first service forwarding entity (SFE) and a second SFE forwarding a service stream, where the first SFE and the second SFE are on a service function chain corresponding to the service stream, generating, by the controller, first forwarding information for the first SFE and second forwarding information for the second SFE, and sending, by the controller, the first forwarding information to the first SFE and sending the second forwarding information to the second SFE. Hence, the controller generates forwarding information for the SFE such that a service chaining technology can be applied to a service environment in which a large quantity of services and a large quantity of service processing function units exist.

Abstract: A method for determining a clock synchronization path, and a device, where the method includes determining a first clock synchronization path from a clock injection node of the first network to the first network element based on a request of the first network element and the clock synchronization topology of the first network. A clock synchronization topology is automatically updated based on clock synchronization capability information of a network element, and a clock synchronization path is determined to reduce costs of deploying a clock synchronization path.

Abstract: The present application discloses a method for generating forwarding information. The method includes: determining, by a controller, a first SFE and a second SFE that are used to forward a service stream, where the first SFE and the second SFE are on a service function chain corresponding to the service stream; generating, by the controller, first forwarding information for the first SFE and generating second forwarding information for the second SFE; and sending, by the controller, the first forwarding information to the first SFE and sending the second forwarding information to the second SFE. According to the method for generating forwarding information, the controller generates forwarding information for the SFE, so that a service chaining technology can be applied to a service environment in which a large quantity of services and a large quantity of service processing function units exist.

Abstract: A method and network node for obtaining a target transmission path, where the method includes obtaining, by a first network node in a network domain, topology information of a plurality of network nodes on each path between an ingress node and an egress node that are in the network domain, obtaining, by the first network node, a transmission delay of each path according to the topology information, where the transmission delay of each path includes a sum of physical link delays between all network nodes on each path and node residence times of all the network nodes on each path, and determining, by the first network node, the target transmission path according to the transmission delay of each path.

Abstract: A method, node, and system for detecting a clock synchronization path, where the method includes generating, by a first node, a synchronization detection request message, sending the synchronization detection request message to a second node, where the synchronization detection request message includes an identifier (ID) of the first node, generating, by the second node, a synchronization detection response message according to the synchronization detection request message, sending the synchronization detection response message to the first node, where the synchronization detection response message includes clock topology information of the second node and the ID of the first node, and obtaining, by the first node, a first detection result according to the synchronization detection response message, where the first detection result indicates a status of a clock synchronization path between the first node and the second node.

Abstract: The present invention discloses a method for implementing an E-tree service and a provider edge device, and relates to the field of network communications technologies. A local PE device obtains leaf PE attribute information of a peer provider edge PE device; when the leaf PE attribute information of the peer PE device indicates that the peer PE device is a leaf PE device and the local PE device is a leaf PE device, the local PE device forbids a pseudo-wire connection between the local PE device and the peer PE device. The technical solution of the present invention implements effective isolation between leaf nodes supporting an E-Tree service and therefore implements the E-Tree service in a VPLS network.

Abstract: A method and an apparatus for processing a modified packet. A first routing device obtains a first packet sent by a second routing device, where the first packet carries a first correspondence, creates a forwarding entry that includes the first correspondence, receives a modified packet and determines an ID of a destination service function (SF) of the modified packet, queries the forwarding entry according to the ID of the destination SF, and determines that an SF identified by the ID of the destination SF is an SF connected to a second routing device, and forwards the modified packet to the second routing device.

Abstract: The present application discloses a method for generating forwarding information. The method includes: determining, by a controller, a first SFE and a second SFE that are used to forward a service stream, where the first SFE and the second SFE are on a service function chain corresponding to the service stream; generating, by the controller, first forwarding information for the first SFE and generating second forwarding information for the second SFE; and sending, by the controller, the first forwarding information to the first SFE and sending the second forwarding information to the second SFE. According to the method for generating forwarding information, the controller generates forwarding information for the SFE, so that a service chaining technology can be applied to a service environment in which a large quantity of services and a large quantity of service processing function units exist.

Abstract: Embodiments of the present invention disclose apparatuses. The apparatus includes a program instructing hardware and a computer readable storage medium coupled to the hardware and storing programming instructions for execution by the hardware, the programming instructions instruct the hardware to: receive a network device selection message sent by a first network device, where the network device selection message contains a virtual local area network (VLAN) mapping capability identifier of the first network device and a device identifier of the first network device; when determining that both the apparatus and the first network device have VLAN mapping capability according to local VLAN mapping capability and the VLAN mapping capability identifier of the first network device, select a network device for executing VLAN mapping according to sizes or a sequence of a local device identifier and the device identifier of the first network device.

Abstract: Embodiments of the present invention disclose a method, an apparatus, and a system for selecting a network device. The method includes: receiving, by a second network device, a network device selection message sent by a first network device, where the network device selection message contains a VLAN mapping capability identifier of the first network device; and selecting, by the second network device, according to the VLAN mapping capability identifier and local VLAN mapping capability, a network device for executing VLAN mapping. By using the technical solutions provided in the embodiments of the present invention, execution of VLAN mapping for a bidirectional pseudo wire (PW) between two network devices on a same network device may be implemented, and there are only two VLAN identifiers on the bidirectional PW, thereby ensuring consistency of VLAN mapping and making it simpler and easier to maintain and detect the PW.

Abstract: The present disclosure relates to the field of network communication, and in particular, to a method for sending Ethernet frames in an Ethernet Tree service and a provider edge device. The method includes: receiving, by a VLAN bridge, Ethernet frames sent by a root node or a leaf node; importing, by the VLAN bridge, the Ethernet frames into a root VLAN or a leaf VLAN according to the type of the node sending the Ethernet frames, and sending the Ethernet frames to a same virtual switch instance VSI; and sending, by the VSI, the Ethernet frames to a corresponding remote PE device by a pseudowire. Using the solution provided in the embodiments of the present disclosure, a VLAN is associated with the type of the node sending the Ethernet frames, thereby achieving effective isolation between the E-Tree leaf nodes and ensuring the original scalability of VPLS.

Abstract: The present invention discloses a method for implementing an E-tree service and a provider edge device, and relates to the field of network communications technologies. A local PE device obtains leaf PE attribute information of a peer provider edge PE device; when the leaf PE attribute information of the peer PE device indicates that the peer PE device is a leaf PE device and the local PE device is a leaf PE device, the local PE device forbids a pseudo-wire connection between the local PE device and the peer PE device. The technical solution of the present invention implements effective isolation between leaf nodes supporting an E-Tree service and therefore implements the E-Tree service in a VPLS network.

Abstract: The present invention is applicable to the field of PONs and provides a PON protection method and apparatus. A first transmission path is established between a first OLT and a far-end network node, and a second transmission path is established between a second OLT and the far-end network node. When it is found that a fault occurs on an optical path of the first OLT, a PON port corresponding to the optical path is switched to a corresponding PON port on the second OLT, and a fault notification is sent to the far-end network node. After receiving the fault notification, the far-end network node switches a data flow of the PON port corresponding to the optical path from the first transmission path to the second transmission path.

Abstract: Embodiments of the present invention disclose a method, an apparatus, and a system for selecting a network device. The method includes: receiving, by a second network device, a network device selection message sent by a first network device, where the network device selection message contains a VLAN mapping capability identifier of the first network device; and selecting, by the second network device, according to the VLAN mapping capability identifier and local VLAN mapping capability, a network device for executing VLAN mapping. By using the technical solutions provided in the embodiments of the present invention, execution of VLAN mapping for a bidirectional pseudo wire (PW) between two network devices on a same network device may be implemented, and there are only two VLAN identifiers on the bidirectional PW, thereby ensuring consistency of VLAN mapping and making it simpler and easier to maintain and detect the PW.

Abstract: The present disclosure relates to the field of network communication, and in particular, to a method for sending Ethernet frames in an Ethernet Tree service and a provider edge device. The method includes: receiving, by a VLAN bridge, Ethernet frames sent by a root node or a leaf node; importing, by the VLAN bridge, the Ethernet frames into a root VLAN or a leaf VLAN according to the type of the node sending the Ethernet frames, and sending the Ethernet frames to a same virtual switch instance VSI; and sending, by the VSI, the Ethernet frames to a corresponding remote PE device by a pseudowire. Using the solution provided in the embodiments of the present disclosure, a VLAN is associated with the type of the node sending the Ethernet frames, thereby achieving effective isolation between the E-Tree leaf nodes and ensuring the original scalability of VPLS.