WO2017156987A1 - Procédé et appareil d'établissement de chemin ethernet flexible (flexe) - Google Patents

Procédé et appareil d'établissement de chemin ethernet flexible (flexe) Download PDF

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Publication number
WO2017156987A1
WO2017156987A1 PCT/CN2016/097204 CN2016097204W WO2017156987A1 WO 2017156987 A1 WO2017156987 A1 WO 2017156987A1 CN 2016097204 W CN2016097204 W CN 2016097204W WO 2017156987 A1 WO2017156987 A1 WO 2017156987A1
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path
node
flexible ethernet
lsp
physical layer
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PCT/CN2016/097204
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English (en)
Chinese (zh)
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王其磊
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中兴通讯股份有限公司
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/70—Admission control; Resource allocation
    • H04L47/72—Admission control; Resource allocation using reservation actions during connection setup
    • H04L47/724—Admission control; Resource allocation using reservation actions during connection setup at intermediate nodes, e.g. resource reservation protocol [RSVP]

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  • This application relates to, but is not limited to, the field of control plane technology.
  • Flexible Ethernet is an emerging transmission technology that provides a common mechanism to support a variety of existing Ethernet MAC (Media Access Control) signal rates. These Ethernet MAC rates may not Matches to any existing Ethernet Physical Layer (PHY) rate, including those that can be bundled later than the Ethernet physical layer, and those that are sub-rate or channelized later than Ethernet physics A MAC signal with a small layer rate. More visually, it can be seen as a multi-link universalization implementation. Specifically, the capabilities of flexible Ethernet support are as follows:
  • Bundling of multiple Ethernet PHY signals for example by bundling two 100GBASE-R PHYs to carry a 200G MAC signal.
  • the Ethernet PHY signal carries a sub-rate signal, such as a 100GBASE-R PHY, to carry a 50G signal.
  • Channelization within a PHY signal or a set of bound PHY signals for example, supporting transmission of one 150G signal and two 25G signals on three bonded 100GBASE-R PHYs.
  • FlexE An example of the general structure of FlexE is shown in Figure 1.
  • the FlexE group refers to a group of 1 to n Ethernet PHYs bound together.
  • FlexE Clients refer to those based on MAC data rate and can not match any Ethernet.
  • the PHY stream currently supports a client MAC rate of 10, 40 or m*25Gb/s.
  • the FlexE shim is used to map or unmap client signals to the FlexE group.
  • FlexE can support a variety of applications, including the following three:
  • the connection of the first router to the transport network is shown in Figure 2.
  • the transport network does not sense the FlexE signal.
  • the transport network edge device will each 100GBASE-R
  • the signal is mapped to the OPU4 (Overhead Processing Unit) of the OTN (Optical Transport Network) for further transmission.
  • the transport network edge device does not need to perceive what the FlexE transmission technology is, but only needs to perceive one by one.
  • the binary bit stream is fine.
  • the second router connects to the transmission network.
  • the transmission network senses the FlexE signal.
  • the transmission network edge device parses the FlexE client signal and then multiplexes it into the OPU4 signal of the OTN for transmission.
  • the third type of router to the transmission network connection as shown in Figure 4, in this scenario, the transport network edge device discards the unavailable time slots, and only transmits the time slots in use.
  • the FlexE mechanism uses a calendar module (FlexE Calendar) to perform package mapping and decapsulation mapping of client signals.
  • This calendar is used to divide each PHY physical signal in the FlexE group into several 66B blocks for FlexE customers. FlexE Calendar is Based on these location blocks, it is clarified which customers use which slots (slots).
  • each 66B data block in FlexE Calendar has a granularity of 5G, so for each 100G PHY physical signal with 20 slots of time slots, FlexE specifies that each slot allows two states. One is an unused state, and the other is an unavailable state that may be caused by a transport network constraint.
  • the FlexE Calendar is 20*n long.
  • blocks allocated by FlexE Calendar are allocated to n sub-calendars, and each sub-calendar is composed of 20 blocks corresponding to one PHY signal.
  • control plane is required to provide a solution to establish the transport plane end-to-end path.
  • the embodiment of the invention provides a method for establishing a flexible Ethernet path, which is applied to a destination node, and includes:
  • the Resv message includes one or more of the following: a flexible Ethernet group number, a flag bit, a time slot allocation information, a physical layer number, a client indicator, and a number of unavailable time slots.
  • the embodiment of the invention further provides a method for establishing a flexible Ethernet path, which is applied to a source node, and includes:
  • the Resv message includes one or more of the following: a flexible Ethernet group number, a flag bit, a time slot allocation information, a physical layer number, a client indicator, and a number of unavailable time slots. .
  • the embodiment of the invention further provides a device for establishing a flexible Ethernet path, which is set in the destination node, and includes:
  • a first receiving module configured to receive a flexible Ethernet path setup message sent by the source node
  • a first path establishing module configured to perform local resource reservation according to information in the flexible Ethernet path setup message to establish a flexible Ethernet communication path
  • a feedback module configured to send a reservation state Resv message to the source node
  • the Resv message includes one or more of the following: a flexible Ethernet group number, a flag bit, a time slot allocation information, a physical layer number, a client indicator, and a number of unavailable time slots; wherein: the flexible Ethernet group number A flexible Ethernet group for identifying between the source node and the destination node; the flag bit is used to identify a calendar configuration type used by the client and whether to perform time slot resource configuration; the time slot allocation information is used to identify a physical layer path Time slot channel allocation information; the physical layer number is used to identify a physical layer path of a flexible Ethernet group; the client indicator is used to identify a client in a flexible Ethernet group; The number of unavailable time slots is identified.
  • the embodiment of the invention further provides a device for establishing a flexible Ethernet path, which is set at the source node.
  • a device for establishing a flexible Ethernet path which is set at the source node.
  • a requesting module configured to send a flexible Ethernet path setup message to the destination node
  • a second receiving module configured to receive a reservation state Resv message sent by the destination node
  • a second path establishing module configured to perform outbound interface time slot resource reservation according to the Resv message and establish a communication path
  • the Resv message includes one or more of the following: a flexible Ethernet group number, a flag bit, a time slot allocation information, a physical layer number, a client indicator, and a number of unavailable time slots; wherein: the flexible Ethernet group number A flexible Ethernet group for identifying between the source node and the destination node; the flag bit is used to identify a calendar configuration type used by the client and whether to perform time slot resource configuration; the time slot allocation information is used to identify a physical layer path Time slot channel allocation information; the physical layer number is used to identify a physical layer path of a flexible Ethernet group; the client indicator is used to identify a client in a flexible Ethernet group; The number of unavailable time slots is identified.
  • the foregoing flexible Ethernet path establishment method and device can implement the function of establishing a plane-to-end FlexE LSP path.
  • FIG. 1 is a schematic diagram of a general structure of a related art FlexE
  • FIG. 2 is a schematic diagram of a related art transmission network that does not sense a connection of a router to a transmission FlexE;
  • FIG. 3 is a schematic diagram of a connection of a related art transport network aware FlexE
  • FIG. 4 is a schematic diagram of a partial rate transfer of a related art FlexE group
  • FIG. 6 is a flowchart of a method for establishing a flexible Ethernet path according to an embodiment of the present invention
  • FIG. 7 is a flowchart of a method for establishing a flexible Ethernet path according to an embodiment of the present invention.
  • FIG. 8 is a schematic structural diagram of an apparatus for establishing a flexible Ethernet path according to an embodiment of the present invention.
  • FIG. 9 is a schematic structural diagram of an apparatus for establishing a flexible Ethernet path according to an embodiment of the present invention.
  • FIG. 10 is a schematic diagram of a label format of a reservation state Resv message according to an embodiment of the present invention.
  • FIG. 11 is a network application scenario diagram of Embodiments 1 and 2 of the present invention.
  • the embodiment of the present invention provides a method for establishing a flexible Ethernet path, which is applied to a destination node, including:
  • the Resv message includes one or more of the following: a flexible Ethernet group number, a flag bit, a time slot allocation information, a physical layer number, a client indicator, and a number of unavailable time slots. among them:
  • the flexible Ethernet group number is used to identify a flexible Ethernet group between the source node and the destination node;
  • the flag bit is used to identify a calendar configuration type used by the client and whether to perform time slot resource configuration
  • the time slot allocation information is used to identify time slot channel allocation information in a physical layer path
  • the physical layer number is used to identify the physical layer path of the flexible Ethernet group.
  • the client indicator is used to identify the client in the flexible Ethernet group
  • the number of unavailable time slots is used to identify the number of unavailable time slots.
  • the flexible Ethernet path setup message includes a universal label establishment request object, and the universal label establishment request object includes a switch type, a Label Switching Path (LSP) coding type, a G-PID payload type, and Information of bandwidth requirements, source nodes, and target nodes, wherein the G-PID payload type is set to an Ethernet MAC.
  • LSP Label Switching Path
  • the method before step S103, the method further includes:
  • the virtual Ethernet interface According to the load type carried in the load type G-PID, the virtual Ethernet interface.
  • the Resv message further includes a resource reservation protocol hopping RSVP_HOP object, where the RSVP_HOP object includes physical port information of the corresponding physical link, the physical port identified by the physical layer number, and the physical body included in the RSVP_HOP object.
  • the number and order of the ports are the same.
  • the LSP coding type in the label establishment request object is a partial rate flexible Ethernet LSP
  • the flexible Ethernet path establishment message further includes a label switching path attribute LSP_ATTRIBUTES object, and an attribute extended by the LSP_ATTRIBUTES object.
  • the type-length-value TLV carries the number of time slots available for each physical layer path between the source node and the destination node at the flexible Ethernet layer.
  • the destination node performs local resource reservation according to the information in the flexible Ethernet path setup message, including: acquiring each source node to the destination node according to the value of the attribute TLV extended by the LSP_ATTRIBUTES object.
  • Physical Layer Path The number of time slots available at the flexible Ethernet layer, and local resource reservation based on the number of available time slots.
  • the FlexE end-to-end path is carried by the Ethernet PHY path, so when establishing a FlexE-level path, you need to ensure that the PHY link between two adjacent FlexE nodes is established. Based on this, when using the signaling to establish a FlexE path, it needs to contain the information of the Ethernet PHY layer to be established, as shown in Figure 10, where:
  • the FlexE Group Number also called the flexible Ethernet group number, is used to identify the flexible Ethernet group between the source node and the destination node.
  • the FlexE Group Number of this embodiment can use 20 bits: for some The application distinguishes between different FlexE Groups, mainly because of the possibility of duplicate PHY Numbers.
  • an 8-port device can act as a single 8-port group or as two 4-port groups. Root According to the FlexE standard, the FlexE Group Number at both ends of the device should use the same identity, so the FlexE Group Number is dynamically specified by the signaling when the path is established.
  • Flags used to identify the type of calendar configuration used by the client and whether to configure slot resources.
  • two flag bits are allocated, and one flag bit is used to indicate whether the currently established client uses the "A" Calendar configuration or the "B" Calendar configuration. For example, setting to 0 means that the "A" Calendar configuration is used. If set to 1, it means that the "B" Calendar configuration is used; another flag is used in conjunction with the Slots Assignment Information to indicate whether the slot resource configuration needs to be configured on the node. When the flag is set to 1, The node needs to configure local resource reservation according to the label in the signaling.
  • the slots when this flag is set to 0, only need to consider which slots need to be allocated for the customer, regardless of the slots that are not allocated to the client ( The slot in the Slots Assignment Information field with the bit set to 0).
  • the reason is that a PHY cannot be used by multiple FlexEs at the same time, so when setting up a FlexE connection for the first time, you need to consider both the allocation of the slots allocated to the customer and the configuration of the slots that are not allocated to the customer. These are not assigned to the customer.
  • the slots can continue to be used by other customers after the FlexE connection is established. If the remaining bandwidth in the FlexE connection is to be allocated to other customers, you only need to consider which slots to use.
  • the physical layer number also known as the physical layer number, is used to identify the physical layer path of a flexible Ethernet group.
  • the PHY Number of this embodiment is the same at the FlexE shim at both ends of a FlexE Group, and is dynamically allocated by signaling when it is built.
  • a client indicator that identifies a client in a flexible Ethernet group may use 16 bits, and the client indicator after the negotiation of the signaling process carries the client identifier field carried in the time slot in the FlexE header overhead field.
  • Unavailable slots number which is used to identify the number of unavailable time slots; the Unavailable slots Number of this embodiment can use 8 bits, and the unavailable time slots will be used. Arranged in the last few consecutive time slots of each child Calendar.
  • the embodiment further provides a method for establishing a flexible Ethernet path, which is applied to a source node, and includes:
  • the Resv message includes one or more of the following: a flexible Ethernet group number, a flag bit, a time slot allocation information, a physical layer number, a client indicator, and a number of unavailable time slots.
  • the flexible Ethernet group number is used to identify a flexible Ethernet group between the source node and the destination node; the flag bit is used to identify a calendar configuration type used by the client and whether to perform time slot resource configuration;
  • the slot allocation information is used to identify slot channel allocation information in the physical layer path; the physical layer number is used to identify a physical layer path of the flexible Ethernet group; the client indicator is used to identify a client in the flexible Ethernet group
  • the number of unavailable time slots is used to identify the number of unavailable time slots.
  • the flexible Ethernet path setup message includes a universal label establishment request object
  • the universal label establishment request object includes a switch type, a label switched path LSP coding type, a G-PID payload type, a bandwidth requirement, a source node, and Information of the target node, wherein the LSP coding type is set to a partial rate flexible Ethernet LSP.
  • the LSP coding type is set to a partial rate flexible Ethernet LSP;
  • the flexible Ethernet path setup message further includes one or more of the following objects:
  • the ERO including a portion rate identifier for specifying a node performing partial rate encapsulation mapping and/or decapsulation mapping;
  • the label switched path attribute LSP_ATTRIBUTES object includes an attribute type-length-value TLV extended by the LSP_ATTRIBUTES object, and the attribute TLV carries the number of time slots available for each physical layer path between the source node and the destination node at the flexible Ethernet layer. .
  • the Resv message may further include: a resource reservation protocol hopping RSVP_HOP object, where the RSVP_HOP object includes physical port information of the corresponding physical link, where the physical port number identifies the physical port and the RSVP_HOP object includes Number and order of physical ports Consistent.
  • the method before the step S201 sends the setup path message to the destination node, the method further includes: establishing an Ethernet physical layer path with the destination node by using the optical transport network OTN node, and carrying the signal of the flexible Ethernet path by using the physical layer path flow.
  • the method before the step S201 sends the setup path message to the destination node, the method further includes: the source node and the first OTN node establish an Ethernet physical layer path to carry the signal traffic of the flexible Ethernet path, where the An OTN optical channel data unit is established between the OTN node and the second OTN node, and the flexible ODUFlex path carries the signal traffic of the flexible Ethernet path, and the Ethernet physical layer path bearer is established between the second OTN node and the destination node. Signal traffic for flexible Ethernet paths.
  • the LSP end-to-end available time slot TLV of the LSP_ATTRIBUTES object in the flexible Ethernet path setup message carries the source a number of available time slots of each member link between the node and the first OTN node; when the first OTN node transmits the flexible Ethernet path setup message to the second OTN node, establishing a message through the flexible Ethernet path
  • the LSP end-to-end available time slot TLV of the medium LSP_ATTRIBUTES object carries the number of available time slots of each member link between the first OTN node and the second OTN node; the second OTN node establishes the flexible Ethernet path
  • the LSP end-to-end available time slot TLV of the LSP_ATTRIBUTES object in the flexible Ethernet path setup message carries the number of available time slots of each member link between the second OTN node and the destination node.
  • the partial rate identifier is used to identify a partial rate encapsulation mapping or decapsulation mapping at the destination node;
  • the attribute TLV of the LSP_ATTRIBUTES object extension is used to identify a flexible ether between the source node and the destination node. The number of time slots available on each link of the network member path.
  • the Attribute Flag TLV is used.
  • two identifier bits are allocated to indicate whether a partial-rate mapping is required, and when the binary code of the identifier bit is 11 indicates that it is necessary to extract all available time slots in the FlexE (that is, the state of the slot is not unavailable), and then map these time slots to the transmission network to continue transmission; when the binary code of the identification bit is 00, it indicates that it needs to Pass These time slots are recovered in the sending network and then placed in the FlexE network to continue the transmission. For the other "01" and "10" states, no operation is performed.
  • This embodiment extends a new attribute TLV in the LSP_ATTRIBUTES object defined in RFC5420 - the FlexE link available time slot TLV, which contains only a number of 8-bit field, each 8-bit field corresponding to one used by FlexE.
  • the PHY member path uses these 8-byte fields to collect the maximum number of time slots that each end-to-end PHY member path can support.
  • the order in which the 8-bit field corresponds to the PHY is the same as the order in which the PHYs are arranged in the actual tag.
  • the slot granularity information supported by the FlexE can be calculated according to the bandwidth information and the number of bits used, and the slot granularity information to be used can be explicitly indicated in the signaling.
  • the channel used for signaling construction can be an out-of-band channel or a management channel provided by FlexE technology.
  • the embodiment further provides a device for establishing a flexible Ethernet path, which is set in the destination node, and includes:
  • a first receiving module configured to receive a setup path message sent by the source node
  • a first path establishing module configured to perform local resource reservation and establish a communication path according to the information in the flexible Ethernet path establishment message
  • a feedback module configured to send a reservation state Resv message to the source node
  • the Resv message includes one or more of the following: a flexible Ethernet group number, a flag bit, a time slot allocation information, a physical layer number, a client indicator, and a number of unavailable time slots;
  • the flexible Ethernet group number is used to identify a flexible Ethernet group between the source node and the destination node;
  • the flag bit is used to identify the calendar configuration type used by the client and whether to perform time slot resource configuration; Identifying time slot channel allocation information in the physical layer path;
  • the physical layer number is used to identify a physical layer path of the flexible Ethernet group;
  • the client indicator is used to identify a client in the flexible Ethernet group;
  • the number of unavailable time slots is used to identify the number of unavailable time slots.
  • the flexible Ethernet path setup message includes a universal label establishment request object, and the universal label establishment request object includes a switch type, a label switched path LSP coding type, a G-PID payload type, a bandwidth requirement, a source node, and Information of the target node, wherein the G-PID The load type is set to Ethernet MAC;
  • the first path establishing module is further configured to: according to the flexible Ethernet path setup message encapsulation resource reservation protocol hopping RSVP_HOP object, according to a load type carried in the payload type G-PID, a virtual Ethernet interface;
  • the RSVP_HOP object includes the physical port information of the corresponding physical link, and the physical port identified by the physical layer number is consistent with the number and order of the physical ports included in the RSVP_HOP object.
  • the LSP coding type in the label establishment request object is a partial rate flexible Ethernet LSP
  • the flexible Ethernet path establishment message further includes a label switching path attribute LSP_ATTRIBUTES object, and an attribute extended by the LSP_ATTRIBUTES object.
  • the type-length-value TLV carries the number of time slots available for each physical layer path between the source node and the destination node at the flexible Ethernet layer; the first path establishment module performs the information according to the flexible Ethernet path establishment message.
  • the local resource reservation includes: obtaining, according to the value of the attribute TLV of the extended LSP attribute object, the number of time slots available for each physical layer path between the source node and the destination node in the flexible Ethernet layer, according to the available The number of time slots is used for local resource reservation.
  • the embodiment further provides a device for establishing a flexible Ethernet path, which is set at a source node, and includes:
  • a requesting module configured to send a flexible Ethernet path setup message to the destination node
  • a second receiving module configured to receive a reservation state Resv message sent by the destination node
  • a second path establishing module configured to perform outbound interface time slot resource reservation according to the Resv message and establish a communication path
  • the Resv message includes one or more of the following: a flexible Ethernet group number, a flag bit, a time slot allocation information, a physical layer number, a client indicator, and a number of unavailable time slots; wherein: the flexible Ethernet group number A flexible Ethernet group for identifying between the source node and the destination node; the flag bit is used to identify a calendar configuration type used by the client and whether to perform time slot resource configuration; the time slot allocation information is used to identify a physical layer path Time slot channel allocation information; the physical layer number is used to identify a physical layer path of a flexible Ethernet group; the client indicator is used to identify a client in a flexible Ethernet group; The number of unavailable time slots is identified.
  • the flexible Ethernet path setup message sent by the requesting module includes a universal label establishment request object
  • the universal label establishment request object includes a switch type, a label switched path LSP coding type, a G-PID payload type, Information about bandwidth requirements, source nodes, and target nodes.
  • the G-PID payload type is set to an Ethernet MAC;
  • the flexible Ethernet path setup message further includes one or more of the following objects:
  • a routing object ERO including for a partial rate identifier, the partial rate identifier being used to specify a node that performs partial rate encapsulation mapping and/or decapsulation mapping;
  • the label switched path attribute LSP_ATTRIBUTES object includes an attribute type-length-value TLV extended by the LSP_ATTRIBUTES object, and the attribute TLV carries the number of time slots available for each physical layer path between the source node and the destination node at the flexible Ethernet layer. .
  • the attribute TLV extended by the LSP_ATTRIBUTES object in the flexible Ethernet path setup message sent by the requesting module is used to identify a flexible Ethernet group member path between the source node and the destination node.
  • the apparatus further includes a physical layer path establishing module, configured to: before the requesting module sends a flexible Ethernet path establishment message to the destination node, establish an OTN node and the destination node through the optical transport network An Ethernet physical layer path between the two to carry the signal traffic of the flexible Ethernet path; or establish an Ethernet physical layer path between the source node and the first ONT node, the first OTN node, and the second OTN node
  • the OTN optical channel data unit has a flexible ODUFlex path and an Ethernet physical layer path between the second OTN node and the destination node to carry signal traffic of the flexible Ethernet path.
  • the above solution uses the extension of signaling to support the establishment of the FlexE transport plane path, which can fill the gap of the FlexE control plane signaling road, and is used to establish an end-to-end path in the FlexE scenario to complete the end-to-end path on each node.
  • the reservation of resources such as ports and time slots provides the function of establishing the end-to-end FlexE LSP path of the control plane.
  • Embodiment 1 is a diagrammatic representation of Embodiment 1:
  • the nodes are Ethernet nodes, and the B and E nodes are nodes supporting FlexE technology, such as FlexE Shim nodes, which can support full-rate client layer signal mapping and demapping, C and D are OTN nodes, and C and D nodes are not aware of FlexE applications.
  • the service bandwidth between A and B and E and F is 150G.
  • the carrier signals are carried by three 100G PHY physical lines between B and C and D and E. The physical numbers are 11 and 12, 13, C and D respectively.
  • There is an OTN connection which can be a signal connection of two ODU4s, wherein the granularity of the time slot is 1.25G. In this scenario, the unavailable time slot is usually not used.
  • the user wants to establish a 150G Ethernet service from A to F nodes, and establishes an end-to-end path using the RSVP-TE signaling flow. It is assumed that the path sequence has been calculated and is A-B-C-D-E-F. The process of establishing the entire path is as follows:
  • the node A sends a signaling Path message, where the message includes a general label establishment request object, where the exchange type is set to PSC-1 packet exchange, the LSP coding type (Encoding Type) is Ethernet, the bandwidth to be established is 150G, the source point and the destination node. For information such as A and F, the Path message is sent to the next hop B node.
  • the exchange type is set to PSC-1 packet exchange
  • the LSP coding type Encoding Type
  • the bandwidth to be established is 150G
  • the source point and the destination node For information such as A and F, the Path message is sent to the next hop B node.
  • the Node B After receiving the Path message sent by the A node, the Node B determines that the path to be established and the path initiated by the A node belong to different switching levels according to the exchange type and other fields in the signaling, so the Node B first blocks the A node.
  • Object where the exchange type is set to TDM time slot exchange, LSP Encoding Type is FlexE LSP, G-PID load type is Ethernet MAC, the bandwidth to be established is 150G, and the source and destination nodes are B and E.
  • B first encapsulates two new Ethernet PHY paths to establish a Path message, which is used to establish two PHY paths between the Node B and the E node.
  • the bandwidth to be established is 100G.
  • the source and destination nodes are B and E, and then the Path message is sent to the next hop C node (where the FlexE LSP in the LSP Encoding Type is the newly defined coding type).
  • the C node After receiving the Path message sent by the Node B, the C node judges that the path to be established and the path initiated by the Node B belong to different switching levels according to the exchange type and other fields in the signaling, so the C node first blocks the Node B to send. Path message coming over, and then encapsulating two new ones in turn
  • the OTN path establishes a Path message, and the message includes a universal label establishment request object, where the exchange type is set to OTN-TDM time slot exchange, the LSP Encoding Type is G.709ODUk (Digital Path), and the G-PID load type is FlexE Ethernet PHY.
  • the established bandwidth is 100G
  • the source and destination nodes are C and D
  • the Path message is sent to the next hop D node
  • the two ODU4 path establishment between C and D is completed according to the related technology, then C and D
  • the ODU between the two is the physical connection of the two PHYs for the nodes B and E at both ends.
  • the C node will notify the Ethernet PHY signaling flow blocking on C to continue transmitting.
  • the signaling flow blocked on C is sent to D, and the D node performs a similar operation after receiving the Path message sent by the C node, and then sends it to E.
  • the E node After the E node receives the Path message sent by the D node, because the E node is the destination node, the E node first completes the local resource reservation, completes the path establishment of the Ethernet PHY layer according to the related technology, and sends a signaling Resv message to the D. Node, then to node C, then to node B.
  • the B node After confirming the path establishment of the PHY layer, the B node continues to send the FlexE path to establish the Path message directly to the tail node E.
  • the E node determines that 30 time slots are needed to carry the client signal according to the 150G bandwidth requirement of the client, assuming that the occupied time slot is 1 to 15 slots of 1 and 1 to 15 slots of 2, 16 to 20 slots of 1 and 16 to 20 slots of 2 are unused slots, and resource reservation is also required, where 1, 2 is the PHY path.
  • the number is PHY Number, the PHY path corresponds to the actual PHY link; the second E node encapsulates the RSVP_HOP object, which is used to indicate which two links are to be used. It is assumed that 12 and 13 are used, 12 and 13 are PHY chains.
  • the E node virtualizes the Ethernet interface according to the type of load carried in the G-PID, and the remaining bandwidth of the interface is 50G. That is, for the downstream node F, there is still 50G of available Ethernet bandwidth available. This also ensures that the E-node can demap the Ethernet signal from the FlexE path.
  • the E node sends a Resv message to the Node B, where the Resv message carries the signaling label format given in the present invention, and the assignment values of the fields in the label are:
  • FlexE Group Number Used to uniquely identify a FlexE Group to be used. It exists only between two FlexE Shim nodes. At this time, E allocates an available number according to the usage of its own node FlexE Group Number for unique identification. A FlexE Group between B and E.
  • Flags the bit field, because it is the first time to establish a FlexE connection, so you need to match it on the node. Set resource reservation. Another bit, signaling can be configured here to use the Calendar A type of time slot, to ensure that the nodes at both ends of the path use the same Calendar configuration type.
  • PHY Number A total of two PHY paths are used, so here we need to assign two values to the two PHY Numbers, one for 1 and the other for 2.
  • the order of the specific physical ports identified by the PHY Number should be the same as the order of the member links in the RSVP_HOP object carried in the Resv message.
  • the PHY Number is applied to the end-to-end path and the PHY Number does not change after a few hops.
  • Client Indicator Used to uniquely identify a client in a FlexE group.
  • the client indicator after the negotiation of the signaling process carries the client identifier field carried by the time slot in the FlexE header overhead field (Client carried Calendar) "A" or "B" slot number), it is assumed here that a value of 500 is assigned to identify this client.
  • the first 15 slots in each of the two PHY paths are used, so the FlexE header overhead is required.
  • the time slot carried by the customer identification field is set to 500.
  • the number of occurrences of this field is the same as the number of occurrences of the PHY Number.
  • the bit set to "1" in this field identifies the resource reservation of the time slot allocated to the client, and the bit identifier set to "0" is not Resource reservation for the time slot assigned to the customer. Assuming the FlexE Client uses the first 15 slots in the two PHY paths, the first 15 slots in the two PHYs are set to 1 and the last five slots are set to zero.
  • Unavailable slots Number This field is set to 0 in this embodiment.
  • the Node B After receiving the Resv message sent by the E node, the Node B completes the reservation of the time slot resource on the outbound interface according to the label carried in the signaling, that is, completes the establishment of the FlexE path between the B and the E node. In addition to resource reservation, Node B virtualizes the Ethernet interface according to the type of load carried in the G-PID. The remaining bandwidth of the interface is 50G. That is, for the upstream node A, 50G of Ethernet available bandwidth is still available. This also ensures that Node B can map Ethernet signals to the FlexE path.
  • the Node B will notify the signaling flow blocked on the Node B to continue sending, and the signaling flow blocked on the Node B (the path message sent by the Node A) is sent to the E node (because the intermediate BCDE node) Externally expressed as a one-hop link, that is, the Ethernet link of the BE), and then sent by the E node to the F node.
  • the F node After the F node receives the path message sent from the upstream, because the F node is the destination node, The F node encapsulates the Resv message, sends a Resv message to the E node according to the process of establishing the Ethernet path described in the related art, and then goes to the Node B, and then to the Node A, to complete the establishment of the entire path.
  • an error message is sent to the first node of the corresponding layer according to the relevant process, and after receiving the Error message, the first node recursively completes the sending of each layer of the Error message.
  • Embodiment 2 is a diagrammatic representation of Embodiment 1:
  • the network scenario of Figure 11 is still used, except that the C and D nodes support partial-rate FlexE applications, assuming that the available bandwidth between the C and D nodes is 180G, and there is 4 between B and C. There are 5 unavailable time slots between D and E. In this scenario, information about unavailable time slots is used.
  • the node A sends a signaling Path message, where the message includes a general label establishment request object, where the exchange type is set to PSC-1 packet exchange, the LSP Encoding Type is Ethernet, the bandwidth to be established is 150G, and the source and destination nodes are A and F.
  • the Path message is sent to the next hop B node.
  • the B node After receiving the Path message sent by the A node, the B node judges that the path to be established and the path established by the A node belong to different switching levels according to the exchange type and other fields in the signaling, so the B node first performs path calculation. Confirm that the end-to-end path can be established by establishing a partial-rate FlexE LSP. Then, Node B blocks the Path message sent by the A node, and then encapsulates a new FlexE path to establish a Path message.
  • the message includes a general label establishment request object, where the exchange is performed.
  • the type is set to TDM time slot switching
  • the LSP Encoding Type is Partial-rate FlexE LSP
  • the G-PID payload type is Ethernet MAC
  • the bandwidth to be established is 150G
  • the source and destination nodes are B and E
  • the flooded capability information according to the extension of the new ERO attribute TLV in this embodiment, explicitly specifies the partial-rate mapping in the C node, and the partial-rate mapping in the D node; meanwhile, the B node will
  • the attribute TLV of the extended LSP_ATTRIBUTES object in this embodiment is added to the signaling Path message (also referred to as LSP end to The available time slot TLV) carries the number of time slots available for each PHY path between B and C at the FlexE layer, here 18 and 18.
  • the next hop address supporting the FlexE time slot exchange is C.
  • B first encapsulates two new Ethernet PHY path setup Path messages, which are used to establish two PHY paths between Node B and C nodes.
  • the bandwidth to be established is 100G.
  • the source and destination nodes are B and C.
  • the establishment of the PHY path between B and C is completed.
  • the C node After receiving the path establishment path message sent by the Node B, the C node checks the G-PID field in the path message as a Partial-rate FlexE LSP, and checks itself. Whether to support the partial-rate mapping, after confirming that there is no problem, return a Resv message to Node B to complete the establishment of the PHY path.
  • the Node B After confirming that the PHY path between B and C is established, the Node B sends a FlexE Path Setup Path message to the C node. After receiving the FlexE path setup message sent by the Node B, the C node receives the message according to the type of exchange in the signaling. The field determines that the path to be established and the path establishment initiated by the Node B belong to different switching levels. In this scenario, the FlexE path can be directly carried over the OTN ODUFlex path to perform multi-path switching at the time slot level. Ethernet PHY path.
  • the C node first blocks the Path message sent by the Node B, and then encapsulates a new OTN ODUFlex Path message, where the exchange type is set to OTN-TDM time slot exchange, and the LSP Encoding Type is G.709 ODUk (Digital Path), G-PID.
  • the load type is Partial-rate FlexE LSP. It also considers that the maximum available bandwidth of the C and D nodes is 180G, and this bandwidth can meet the bandwidth requirement of the FlexE customer's 150G. Then, according to the related technology, the path establishment of the OTN ODUFlex layer is continued. The bandwidth is 180G and the OTN ODUFlex is sent.
  • the FlexE slot granularity of the OTN is 1.25G, so one FlexE slot is carried by four OTN slots, the D node resource reservation binds the mapping between the FlexE slot and the OTN slot, and the D node virtualizes two.
  • the FlexE PHY interface assumes that the two interfaces that are virtualized are identified as 41 and 42.
  • the two FlexE PHY interfaces support FlexE time slots; the C node also virtualizes two FlexE PHY interfaces. Assume that the two interfaces that are virtualized have the IDs 51 and 52, and the upstream FlexE Shim B For the node, the two FlexE PHY interfaces support FlexE time slots. At this point, the link between the C and D nodes is a link that supports the FlexE function for the B and E nodes.
  • the C node After confirming the successful establishment of the path between the C and D nodes, the C node considers that the number of available slots for the two paths between C and D is 18 and 18 respectively, and determines that the bandwidth in the signaling is 180G, the source point and the destination. The nodes are C and D, and then the Path message is sent to the next hop D node. The D node repeats the above process, completes the establishment of the Ethernet PHY layer path, and then continues the FlexE layer path establishment. Since the number of the maximum available FlexE slots between the two nodes between the D node and the E node is 18, 17, the attribute TLV field of the LSP_ATTRIBUTES object. The assignment is modified to the corresponding time slot and the FlexE path setup message continues to be sent to the E node.
  • the E node After the E node receives the Path message sent by the D node, because the E node is the destination node, the E node first completes the local resource reservation.
  • the number of the maximum available time slots of the end-to-end path is 18, 17 time slots, and the node E determines, according to this information, that the 1 to 18 time slots of the PHY 1 are available, and the PHY 2 is 1 to 17 time slots are available; in addition, according to the customer's 150G bandwidth requirement, it is determined that 30 time slots are needed to carry the client signal, assuming that the occupied time slot is 1 to 15 time slots of 1 and 1 to 15 time slots of 2, 1 of 16 The ⁇ 18 time slots and the 16 to 17 time slots of 2 are unused slots, and the resource reservation is also required.
  • the E node encapsulates the RSVP_HOP object, which is used to indicate which two physical links to use, and it is assumed that 12 and 12 are used. 13.
  • the E node virtualizes the Ethernet interface according to the type of load carried in the G-PID, and the remaining bandwidth of the interface is 25G, that is, for the downstream node F, there is still 25G of available Ethernet bandwidth available. This also ensures that the E-node can demap the Ethernet signal from the FlexE path.
  • the E node sends a Resv message to the D node, where the Resv message carries the signaling label format given in the present invention, and the assignment values of the fields in the label are:
  • FlexE Group Number Used to uniquely identify a FlexE Group to be used. There are only two FlexE Shim nodes. At this time, E allocates an available number according to the usage of the FlexE Group Number of its own node to uniquely identify one. FlexE Group between B and E.
  • Flags identify the bit field, because it is the first time to establish a FlexE connection, so you need to configure resource reservation on the node.
  • Another bit, signaling can be configured here using the Calendar A type Time slots, ensure that the nodes at both ends of the path use the same Calendar configuration type.
  • PHY Number A total of two PHYs are used, so here we need to assign two values to the two PHY Numbers, one for 1 and the other for 2.
  • the order of the specific physical ports identified by the PHY Number shall be the same as the order of the member link identifiers in the RSVP_HOP object of the Resv message.
  • the PHY Number is applied to the end-to-end path and the PHY Number does not change after a few hops.
  • Client Indicator (16-bit): used to uniquely identify a client in a FlexE group.
  • the client indicator after the negotiation of the signaling process carries the client identifier field carried by the time slot in the FlexE header overhead field (Client carried Calendar " A”or "B" slot number), it is assumed here that a value of 500 is assigned to identify this client. In this embodiment, the first 15 time slots of the two PHYs are used, so the time in the FlexE header overhead is required.
  • the customer ID field of the slot bearer is set to 500.
  • the number of occurrences of this field is the same as the number of occurrences of the PHY Number.
  • the bit set to "1" in this field identifies the resource reservation of the time slot allocated to the client, and the bit identifier set to "0" is not Resource reservation for the time slot assigned to the customer.
  • the FlexE Client uses the first 15 slots of each of the two PHYs
  • the first 15 slots in the two PHYs are set to 1. If the time slot is not available, since FlexE uses two paths to carry, the number of unavailable time slots of the first path is 3 and the number of unavailable time slots of the second path is 2 according to the result of the negotiation.
  • the 16 to 18 time slots in the first path are set to 0 to indicate the resource reservation of the time slot not allocated to the client, and the 16 to 17 time slots in the second path are set to 0 to indicate the time slot not allocated to the client. Resource reservation.
  • Unavailable slots Number The unavailable time slots are arranged in the last few consecutive time slots of each child Calendar. This field is used to indicate the number of unavailable time slots. For both paths, the number of unavailable time slots for the first path is set to 2, and the number of unavailable time slots for the second path is set to 3.
  • the D node After receiving the Resv message sent by the E node, the D node first determines the time slot that the client needs to use between the own and the upstream C node, assuming that the time slots used for the two PHYs are both 2 to 16, then the D node completes.
  • the process of configuring the time slot resource also configures the 2 to 16 time slots carrying the customer service on the ingress port to the 1 to 15 time slots carrying the customer service on the outbound port, and simultaneously uses the unused time slot 1 and 17 to 20 time slots. Switched to 16 to 20 time slots, where the order of the time slots cannot be changed.
  • the D node identifies the previous one as PHY 1 (the actual port number is 41) and the latter one as the PHY 2 (the actual port number is 42) according to the information of the sub-members carried in the RSVP_HOP object in the Resv message.
  • the D node recovers according to the partial-rate demapping identifier in the path message received before.
  • the D node After completing the configuration of the time slot exchange, the D node sends the 2 to 16 time slot information used for the Resv message encapsulation to the upstream C node, and also encapsulates the RSVP_HOP object to indicate the member link to be used, and the C node according to the previous Path message.
  • the partial-rate mapping identifier in the configuration, the configuration transmission plane extracts the available time slots (the slot status is not unavailable), and maps to the transmission in the transmission network.
  • the C node then repeats a similar process and sends a signaling Resv message to the Node B.
  • the B node After receiving the Resv message sent by the C node, the B node completes the reservation of the time slot resource on the outbound interface according to the label carried in the signaling, that is, completes the establishment of the FlexE path between the B and the E node.
  • the Node B virtualizes the Ethernet interface according to the load type carried in the G-PID. Considering the number of unused slots in the established FlexE path, the remaining bandwidth of the interface is determined to be 25G, that is, the upstream node A. In fact, there is still 25G of Ethernet available bandwidth available.
  • the Node B will notify the signaling process that is blocked on the Node B to continue to send, and the signaling flow blocked on the Node B will be sent to the E node (because the intermediate BCDE node acts as a one-hop link externally, also That is, the Ethernet link of the BE) is then sent by the E node to the F node.
  • the F node After the F node receives the path message sent by the upstream, because the F node is the destination node, the F node encapsulates the Resv message, sends a Resv message to the E node according to the process of establishing the Ethernet path described in the prior art, and then goes to Node B, and then to Node A, complete the establishment of the entire path.
  • the computer program can be implemented in a computer readable storage medium, the computer program being executed on a corresponding hardware platform (such as a system, device, device, device, etc.), when executed, including One or a combination of the steps of the method embodiments.
  • all or part of the steps of the above embodiments may also be implemented by using an integrated circuit. These steps may be separately fabricated into individual integrated circuit modules, or multiple modules or steps may be fabricated into a single integrated circuit module. achieve.
  • the devices/function modules/functional units in the above embodiments may be implemented by a general-purpose computing device, which may be centralized on a single computing device or distributed over a network of multiple computing devices.
  • the device/function module/functional unit in the above embodiment When the device/function module/functional unit in the above embodiment is implemented in the form of a software function module and sold or used as a stand-alone product, it can be stored in a computer readable storage medium.
  • the above mentioned computer readable storage medium may be a read only memory, a magnetic disk or an optical disk or the like.
  • the solution of the embodiment of the present invention is used to support the establishment of the FlexE transport plane path by using the extension of the signaling.
  • the blank of the FlexE control plane signaling path can be filled, and the end point is established in the FlexE scenario.
  • the path of the end completes the reservation of resources such as ports and time slots on each node in the end-to-end path, and provides the function of establishing the end-to-end FlexE LSP path of the control plane.

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Abstract

L'invention concerne un procédé et un appareil d'établissement de chemin Ethernet flexible (FlexE), ayant trait au domaine technique des plans de commande. Le procédé consiste : à recevoir un message d'établissement de chemin FlexE envoyé par un nœud source ; selon des informations figurant dans le message d'établissement de chemin FlexE, à réserver une ressource locale et à établir un chemin de communication ; et à envoyer au nœud source un message d'état de réservation (Resv), le message Resv comprenant un ou plusieurs éléments parmi : un numéro de groupe FlexE, un bit de drapeau, des informations d'attribution de créneau temporel, un numéro de couche physique, un indicateur de client et le nombre de créneaux temporels inutilisables. Une extension de signalisation est utilisée pour prendre en charge l'établissement d'un chemin de plan de transmission FlexE, de façon à réaliser une réservation de ressources telles que des ports et des créneaux temporels sur divers nœuds sur un chemin de bout en bout, et à offrir la fonction d'établissement d'un chemin LSP FlexE de bout en bout d'un plan de commande.
PCT/CN2016/097204 2016-03-18 2016-08-29 Procédé et appareil d'établissement de chemin ethernet flexible (flexe) WO2017156987A1 (fr)

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CN113746675A (zh) * 2021-08-31 2021-12-03 烽火通信科技股份有限公司 一种用HQoS实现灵活以太网业务场景的方法及系统
CN113746675B (zh) * 2021-08-31 2023-05-26 烽火通信科技股份有限公司 一种用HQoS实现灵活以太网业务场景的方法及系统

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