WO2017088495A1

WO2017088495A1 - Method and apparatus for acquiring routing information

Info

Publication number: WO2017088495A1
Application number: PCT/CN2016/089459
Authority: WO
Inventors: 王其磊
Original assignee: 中兴通讯股份有限公司
Priority date: 2015-11-26
Filing date: 2016-07-08
Publication date: 2017-06-01
Also published as: CN106803811A

Abstract

Disclosed in embodiments of the present invention are a method and apparatus for acquiring routing information. The method comprises: acquiring port attribute information of a portion of a first node, the port attribute information comprising at least one of the following items or a combination of the items: information indicating whether each timeslot is available, information about support of a port rate capability, the first node at least comprising the port, and the port at least comprising one timeslot; and determining routing information of the first node according to the port attribute information.

Description

Method and device for acquiring routing information

Technical field

The embodiments of the present invention relate to, but are not limited to, communication technologies, and in particular, to a method and an apparatus for acquiring routing information.

Background technique

With the development of communication technology, a new transmission technology, namely Flexible Ethernet (FlexE) technology, has emerged.

Flexible Ethernet can implement multiple transmission methods. For example, the first one bundles multiple Ethernet PHY (physical layer) signals, for example, by tying two 100G Ethernet physical signals (BASE-R PHYs) Set to carry a 200G MAC (Media Access Control Layer) signal; or, second, the Ethernet PHY signal carries sub-rate signals, for example, 100G BASE-R PHYs to carry 50G signals; or, third, one Channelization within the PHY signal or a set of bound PHY signals, for example, supporting transmission of one 150G signal and two 25G signals on three bonded 100G BASE-R PHYs.

However, in the process of implementing the above flexible Ethernet, the port attribute information of the node cannot be obtained, and the path between the nodes cannot be established.

Summary of the invention

The following is an overview of the topics detailed in this document. This Summary is not intended to limit the scope of the claims.

The embodiment of the invention provides a method and a device for acquiring routing information, which are used to solve the problem that a path between nodes cannot be established in a flexible Ethernet.

The method for obtaining routing information provided by the embodiment of the present invention includes:

Obtaining port attribute information of a port of the first node, where the port attribute information includes any one of the following or a combination of the following items: information about whether each time slot is available, and a letter supported by the port rate capability The first node includes at least the one port, and the port includes at least one time slot;

Determining routing information of the first node according to the port attribute information.

Optionally, the information about whether the time slot is available includes any one of the following or a combination of the following: unavailable time slot information, unused time slot information;

The information supported by the port rate capability includes a partial rate or a full rate.

Optionally, the port attribute information is set as a sub-object, or the port attribute information is set in a sub-TLV packet format.

Optionally, wherein the information about whether each time slot is available is identified by a bit, or a field identifier of a port bandwidth is used.

Optionally, the information supported by the port rate capability is identified by a bit.

The embodiment of the invention further provides a device for acquiring routing information, including:

And an obtaining module, configured to obtain port attribute information of a port of the first node, where the port attribute information includes any one of the following or a combination of the following: information about whether each time slot is available, information supported by the port rate capability, where The first node includes at least the one port, and the port includes at least one time slot;

And a determining module, configured to determine routing information of the first node according to the port attribute information.

The embodiment of the invention further provides a computer readable storage medium storing computer executable instructions for implementing the above method.

Compared with the related art, in the embodiment of the present invention, the port attribute information of a port of the first node is obtained, and the port attribute information includes any one of the following or a combination of the following items: information about whether each time slot is available or a port. The rate capability supports the information that the first node includes at least one port, the port includes at least one time slot, and the routing information of the first node is determined according to the port attribute information. The obtaining the first node port attribute information is implemented, so that the path between the first node and other nodes is established according to the first node port attribute information.

Other aspects will be apparent upon reading and understanding the drawings and detailed description.

BRIEF abstract

1 is a schematic flowchart of a method for acquiring routing information according to an embodiment of the present invention;

2 is a schematic diagram of setting port attribute information of a method for acquiring routing information according to an embodiment of the present invention;

3 is a schematic diagram of a node scenario of a method for acquiring routing information according to an embodiment of the present invention;

4 is a schematic diagram of a network scenario of a method for acquiring routing information according to an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of an apparatus for acquiring routing information according to an embodiment of the present invention.

Embodiments of the invention

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that, in the case of no conflict, the features in the embodiments and the embodiments in the present application may be arbitrarily combined with each other.

The method for obtaining routing information provided by the embodiment of the present invention can be applied to establishing a path between nodes in a flexible Ethernet. The method for obtaining the routing information provided in this embodiment may be performed by the obtaining device of the routing information, and the obtaining device of the routing information may be integrated in a node in the flexible Ethernet, or may be separately set, wherein the acquiring device of the routing information may be Implemented in software and/or hardware. The method and apparatus for acquiring routing information provided in this embodiment are described in detail below.

1 is a schematic flowchart of a method for obtaining routing information according to an embodiment of the present invention. As shown in FIG. 1 , a method for obtaining routing information provided in this embodiment includes:

Step 101: Obtain port attribute information of a port of the first node.

In this embodiment, the port attribute information includes any one or a combination of the following: information about whether each time slot is available, information supported by the port rate capability, where the first node includes at least the one A port, the port including at least one time slot.

The port attribute information of the port that obtains the first node may include at least the following two implementation modes:

The first implementation manner is: sending the request information for acquiring the port attribute information to the first node, and then carrying the port attribute information in the response information sent by the first node;

The second implementation manner is: acquiring port attribute information sent by the first node.

Step 102: Determine routing information of the first node according to the port attribute information.

For example, determining, according to the port attribute information, the routing information of the first node includes at least the following three implementation manners:

The first implementation manner is: determining routing information of the first node according to information about whether each time slot is available, and establishing a time slot of the path;

The second implementation manner is: obtaining the data transmission capability of the port of the first node according to the information supported by the port rate capability carried in the port attribute information;

The third implementation manner is: determining the data transmission capability of the port of the first node according to the information supported by the port rate capability carried in the port attribute information, and then determining the route of the first node according to whether the information is available for each time slot. Information, the time slot of the path can be established.

In this embodiment, the port attribute information of a port of the first node is obtained, where the port attribute information includes any one of the following or a combination of the following: information about whether each time slot is available, information supported by the port rate capability, The first node includes at least one port, and the port includes at least one time slot; and determining routing information of the first node according to the port attribute information. The obtaining the first node port attribute information is implemented, so that the path between the first node and other nodes is established according to the first node port attribute information.

On the basis of the foregoing embodiment, the information about whether each time slot is available includes any one of the following or a combination of the following: unavailable time slot information, unused time slot information;

Optionally, on the basis of the foregoing embodiment, the port attribute information is set as a sub-object, or the port attribute information is set in a sub-TLV packet format. The TLV packet format is a Type-length-value (TLV). The T field indicates the packet type. The L field indicates the packet length and the V field stores the content of the packet.

Optionally, on the basis of the foregoing embodiment, the information about whether each time slot is available is identified by a bit, or a field identifier of a port bandwidth is used.

For example, the information about whether each of the time slots is available is identified by a bit, and the unused information (unused slot) and the unavailable information of each time slot can be used by using two 20-bit bits (unavailable) The slot information, for the 20 bits of the unused slot, if the corresponding bit position is 1, indicating that the time slot is not used, can be used to establish an end-to-end path. For the 20 bits of the unavailable slot, if the corresponding bit position is 1, it indicates that the status of this time slot is unavailable.

Optionally, on the basis of the foregoing embodiment, the information supported by the port rate capability is identified by a bit.

For example, a new bit is extended to illustrate the first node's partial-rate and full-rate information, where the Value field is identified by a bit, for example, when When this bit position is 1, it indicates that the partial-rate encapsulation mapping is supported. When this bit position is 0, it indicates that the Full-rate encapsulation mapping is supported. This bit can be extended by a separate sub-object or sub-TLV, or a new bit can be specified in the protocol extension reserved field.

2 is a schematic diagram of setting port attribute information of a method for acquiring routing information according to an embodiment of the present invention. The port attribute information may be set in a lower row of an interface switching capability descriptor as shown in FIG. 2, that is, switching capability specific information. (Switching Capability-specific information).

FIG. 3 is a schematic diagram of a node scenario of a method for acquiring routing information according to an embodiment of the present invention. As shown in Figure 3 For example, using the extension of the OSPF-TE protocol (inter-domain routing protocol), use the ISCD interface capability descriptor shown in Figure 2 to set the Switch Cap field to TDM and Encoding. The field is of the FlexE encoding type, and the switching capability specific information field uses the new FlexE switching capability specific information to carry the FlexE related resource information.

Among them, two adjacent nodes Node1 (Node 1) and Node2 (Node 2) support FlexE exchange, each node contains six ports, physical port numbers are 21-26 and 31-36, respectively, Node1 node and Node2 node The established FlexE Group can support up to six PHY bindings, and the six PHYs can be combined in any combination to form multiple sets of FlexE Groups.

For any connection between Node1 and Node2, it is necessary to advertise the unused time slot condition and the unavailable time slot condition on the link through the routing protocol. For the network scenario shown in FIG. 4, it is assumed that Node1 21 The 3 and 5 slots on the port are unavailable, and the remaining 18 slots are in the initial state of unused. At this time, the coding of the exchange capability specific information field in Figure 3 is:

Not using slot information: except that the 3 and 5 flag positions are 0, all other tag positions are 1;

Unavailable slot information: 3 and 5 are marked with a position of 1, and others are set to 0.

Assuming that a 10G service path is established between the Node1 and Node2 nodes, using 10 and 11 time slots, the coding of the exchange capability specific information field in Figure 3 becomes:

The slot information is not used: except for the 3, 5, 10, and 11 flag positions being 0, all other flag positions are 1;

Unavailable slot information: No change, the 3 and 5 flag positions are still 1, and the others are set to 0.

For all ports in Node1 and Node2, they are released according to the above coding method.

FIG. 4 is a schematic diagram of a network scenario of a method for acquiring routing information according to an embodiment of the present invention. As shown in Figure 4, the A and F nodes are Ethernet nodes, the B and E nodes are nodes supporting FlexE technology, C and D are Optical Transport Networks (OTN) nodes, and the C and D nodes are not aware of FlexE applications. The service bandwidth between A and B and E and F is 150G. B and C and D and E are carried by two 100G physical lines (PHY) to carry the customer signal. Between OC and D is the OTN connection. It is the signal connection of two ODU4, wherein the time slot has a granularity of 1.25G.

In order to ensure that the partial-rate and full-rate capabilities supported by the node are flooded, this embodiment extends a new bit based on the ISCD interface switching capability descriptor defined by the routing protocol defined in RFC4203, and its ISCD format is as follows. As shown in Figure 2, the extended bits are reserved in the Switching Cap Switching Capability field and the Encoding Coding field. The newly extended bits are used to describe the FlexE node's support information for the partial-rate and full-rate capabilities. The bit is used to identify the packet mapping that supports partial-rate when the bit position is 1, and when the bit position is 0, the full-rate encapsulation mapping is supported.

Corresponding to the network scenario shown in FIG. 4, the OTN edge nodes C and D support the capability of the FlexE partial-rate, and need to carry the bit defined in this embodiment when the routing protocol floods, for identifying the C and D node support. Part-rate encapsulation and de-encapsulation, that is, slot-level switching, without the need to parse the FlexE client signal.

When the path calculation unit or node performs the end-to-end path calculation, it can calculate an end-to-end path according to the information supported by the partial-rate flooded by the C and D nodes. When the signal in the path arrives at the C node, The time slots in the non-unavailable state are extracted and mapped to the transmission network transmission, and the time slots are demapped to the initial state at the D node.

FIG. 5 is a schematic structural diagram of an apparatus for acquiring routing information according to an embodiment of the present invention. As shown in FIG. 5, the device for acquiring routing information includes: an obtaining module 51 and a determining module 52. among them,

The obtaining module 51 is configured to obtain port attribute information of a port of the first node, where the port attribute information includes any one of the following or a combination of the following: information about whether each time slot is available, information supported by the port rate capability, The first node includes at least one port, and the port includes at least one time slot;

The determining module 52 is configured to determine routing information of the first node according to the port attribute information.

In this embodiment, the obtaining module 51 acquires port attribute information of a port of the first node, where the port attribute information includes any one of the following or a combination of the following items: information about whether each time slot is available, or port rate capability. Supporting information, the first node includes at least one port, and the port includes at least one time slot; the determining module 52 determines routing information of the first node according to the port attribute information. Obtaining the first node port attribute information, thereby implementing the first node end Port attribute information, establishing a path between the first node and other nodes.

The port rate capability support information includes: a partial rate or a full rate.

Optionally, on the basis of the foregoing embodiment, the port attribute information is set as a sub-object, or the port attribute information is set in a sub-TLV.

A person skilled in the art should understand that the technical solutions of the embodiments of the present invention may be modified or equivalent, without departing from the spirit and scope of the technical solutions of the present application, and should be included in the scope of the claims of the present application.

One of ordinary skill in the art will appreciate that all or a portion of the above steps may be performed by a program to instruct related hardware, such as a processor, which may be stored in a computer readable storage medium, such as a read only memory, disk or optical disk. Wait. Alternatively, all or part of the steps of the above embodiments may also be implemented using one or more integrated circuits. Correspondingly, each module/unit in the above embodiment may be implemented in the form of hardware, for example, by implementing an integrated circuit to implement its corresponding function, or may be implemented in the form of a software function module, for example, executing a program stored in the memory by a processor. / instruction to achieve its corresponding function. Embodiments of the invention are not limited to any specific form of combination of hardware and software.

Industrial applicability

In the embodiment of the present invention, the port attribute information of a port of the first node is obtained, where the port attribute information includes any one of the following or a combination of the following items: information about whether each time slot is available, and information supported by the port rate capability. The first node includes at least the one port, and the port is to Include one less time slot; determining routing information of the first node according to the port attribute information. The obtaining the first node port attribute information is implemented, so that the path between the first node and other nodes is established according to the first node port attribute information.

Claims

A method for obtaining routing information includes:

Obtaining port attribute information of a port of the first node, where the port attribute information includes any one or a combination of the following: information about whether each time slot is available, information supported by port rate capability, where the first The node includes at least the one port, and the port includes at least one time slot;

Determining routing information of the first node according to the port attribute information.
The method according to claim 1, wherein the information on whether each time slot is available comprises any one or a combination of the following: unusable time slot information, unused time slot information;

The information supported by the port rate capability includes a partial rate or a full rate.
The method according to claim 1 or 2, wherein the port attribute information is set as a sub-object, or the port attribute information is set in a sub-TLV message format.
The method according to any one of claims 1-3, wherein the information on whether each time slot is available is identified by a bit or, by a field identifier of a port bandwidth.
The method of any of claims 1-4, wherein the information supported by the port rate capability is identified by a bit.
A device for acquiring routing information, comprising:

And an obtaining module, configured to obtain port attribute information of a port of the first node, where the port attribute information includes any one of the following or a combination of the following: information about whether each time slot is available, information supported by the port rate capability, where The first node includes at least the one port, and the port includes at least one time slot;

And a determining module, configured to determine routing information of the first node according to the port attribute information.
The apparatus according to claim 6, wherein the information on whether each time slot is available comprises any one or a combination of the following: unusable time slot information, unused time slot information;

The information supported by the port rate capability includes a partial rate or a full rate.
The apparatus according to claim 6 or 7, wherein said port attribute information is set to a child The object, or the port attribute information is set in a sub-TLV message format.
The apparatus according to any one of claims 6-8, wherein the information on whether each time slot is available is identified by a bit or, by a field identifier of a port bandwidth.
The apparatus of any of claims 6-9, wherein the information supported by the port rate capability is identified by a bit.