WO2017118422A1

WO2017118422A1 - Method and system for distributing preserved bandwidth of tunnel egress

Info

Publication number: WO2017118422A1
Application number: PCT/CN2017/070478
Authority: WO
Inventors: 李伟
Original assignee: 中兴通讯股份有限公司
Priority date: 2016-01-08
Filing date: 2017-01-06
Publication date: 2017-07-13
Also published as: CN106961399B; CN106961399A

Abstract

Provided are a method and system for distributing a preserved bandwidth of a tunnel egress. The distribution method comprises: during the capacity enlargement for a network element, determining all the tunnel egresses under a capacity enlargement physical interface, and calculating the basic bandwidth of each of the tunnel egress, wherein the basic bandwidth comprises a tunnel bandwidth borne by each of the tunnel egresses; according to the basic bandwidth of the tunnel egress and the maximum physical bandwidth of the capacity enlargement physical interface, calculating and distributing a preserved bandwidth of the tunnel egress, wherein the preserved bandwidth comprises the basic bandwidth. During the capacity enlargement for a network element, a preserved bandwidth of a tunnel egress is calculated and distributed according to a basic bandwidth of the tunnel egress and the maximum physical bandwidth of a capacity enlargement physical interface, so as to ensure that QoS scheduling can be conducted according to a service after the capacity enlargement, and ensure the efficiency of operation and maintenance.

Description

Method and system for allocating reserved bandwidth of tunnel out port

Technical field

The present disclosure relates to the field of communications, and in particular to a method and system for allocating reserved bandwidth of a tunnel out port.

Background technique

With the development of the communication network, the current bearer network carries many types of services, including 2G, 3G, LTE, OLT, large customer service, conference TV, government and enterprise network services, etc. These services will consume a lot of bandwidth, and the operators Bandwidth resources are limited. When the user network service continues to increase and develops to a certain extent, the original device cannot meet the requirements. At this time, it is necessary to perform a dot-add operation and switch the original service to the newly added node, that is, to expand the capacity. The current capacity expansion tool only supports the adjustment of the tunnel routing of the related NEs. The QoS (Quality of Service) and the reserved bandwidth of the tunnel are not processed. This will result in the failure to perform QoS scheduling according to the service after the capacity expansion. Dimensional efficiency has a greater impact.

Summary of the invention

The technical problem to be solved by the present disclosure is to provide a method and system for allocating a reserved bandwidth of a tunnel out port, so as to solve the problem that the tunnel QoS and the reserved bandwidth of the port are not processed in the current network element expansion process.

To solve the above technical problem, an embodiment of the present invention provides a method for allocating a reserved bandwidth of a tunnel out port, where the method for allocating includes:

During the expansion of the network element, the tunnel outbound ports of the physical port are expanded, and the basic bandwidth of each of the outbound ports of the tunnel is calculated, where the basic bandwidth includes the tunnel bandwidth assumed by each outbound port of the tunnel;

Calculating and allocating a reserved bandwidth of the tunnel egress port according to the basic bandwidth of the tunnel egress port and the maximum physical bandwidth of the expanded physical port, where the reserved bandwidth includes the basic bandwidth.

The step of calculating the basic bandwidth of each of the tunnel outbound ports includes:

Determining whether the expanded physical port exists in a protection ring network;

If yes, the protection bandwidth of each of the outbound ports of the tunnel is obtained, and the sum of the protection bandwidth of each of the outbound ports of the tunnel and the tunnel bandwidth assumed by the outbound port of the tunnel is calculated, and the basic bandwidth of the outbound port of the tunnel is obtained;

Otherwise, the tunnel bandwidth assumed by each of the tunnel outbound ports is used as the base bandwidth of the tunnel outbound port.

The tunnel bandwidth assumed by the outbound port of the tunnel is the sum of the bandwidth occupied by each tunnel to which the outbound interface of the tunnel belongs.

The step of calculating and allocating the reserved bandwidth of the tunnel out port includes:

Calculating a port bandwidth assumed by the capacity expansion port, where the port bandwidth is a sum of base bandwidths of all the tunnel out ports;

Obtaining a maximum physical bandwidth of the expanded physical port, and determining a size of the port and the maximum physical bandwidth;

When the maximum physical bandwidth is greater than or equal to the port bandwidth, calculating a bandwidth difference between the maximum physical bandwidth and the port bandwidth, and allocating the bandwidth difference to all of the expanded physical ports The tunnel egress port, wherein the bandwidth difference is the difference between the maximum physical bandwidth minus the port bandwidth, and the reserved bandwidth of the tunnel egress port includes the basic bandwidth of the tunnel egress port and the corresponding Bandwidth difference;

When the maximum physical bandwidth is smaller than the port bandwidth, it is determined that the current capacity expansion fails, and the reserved bandwidth allocation is ended.

The step of allocating the bandwidth difference to all the tunnel out ports under the expansion physical port includes:

The bandwidth difference is evenly distributed to all the tunnel out ports under the capacity expansion physical port.

The reserved bandwidth of the first sub-port is the bandwidth difference of the first sub-port, where the first sub-port of the expansion physical port is no longer used as the tunnel egress port, where the The first sub-port is a port of at least one three-layer sub-port configured in advance on the expansion physical port.

An embodiment of the present invention further provides a tunnel out port reserved bandwidth allocation system, where the distribution system includes:

The calculation module is configured to determine, in the network element expansion process, all the tunnel out ports of the expanded physical port, and calculate the basic bandwidth of each of the tunnel out ports, where the basic bandwidth includes each of the tunnel out ports The tunnel bandwidth assumed;

a calculation and allocation module, configured to calculate and allocate a reserved bandwidth of the tunnel outbound port according to a basic bandwidth of the tunnel outbound port and a maximum physical bandwidth of the expanded physical port, where the reserved bandwidth includes the basic bandwidth.

The computing module includes:

The determining unit is configured to determine whether the expanded physical port exists in a guard ring network, and if yes, execute the first calculating unit, otherwise, execute the second calculating unit;

The first calculating unit is configured to acquire, according to the triggering of the determining unit, the protection bandwidth assumed by each of the outbound ports of the tunnel, and calculate the protection bandwidth assumed by each outbound port of the tunnel and the tunnel bandwidth assumed by the outbound port of the tunnel And the value, get the base bandwidth of the tunnel out port;

The second calculating unit is configured to use the tunnel bandwidth assumed by each of the tunnel outbound ports as the basic bandwidth of the tunnel outbound port according to the triggering of the determining unit.

The tunnel bandwidth assumed by the outbound port of the tunnel is the sum of the bandwidth occupied by each tunnel to which the outbound port of the tunnel belongs.

The calculation and allocation module includes:

a third computing unit, configured to calculate a port bandwidth assumed by the capacity expansion port, where the port bandwidth is a sum of base bandwidths of all the tunnel out ports;

An obtaining and determining unit, configured to obtain a maximum physical bandwidth of the expanded physical port, and determine a size of the port and the maximum physical bandwidth;

a calculating and allocating unit, configured to calculate a bandwidth difference between the maximum physical bandwidth and the port bandwidth when the maximum physical bandwidth is greater than or equal to the port bandwidth, and allocate the bandwidth difference to the All the tunnel out ports of the physical port are expanded, wherein the bandwidth difference is the difference between the maximum physical bandwidth minus the port bandwidth, and the reserved bandwidth of the tunnel out port includes the tunnel out The base bandwidth of the port and the difference in bandwidth that is allocated;

The ending unit is configured to determine that the current capacity expansion fails when the maximum physical bandwidth is less than the port bandwidth, and end the reserved bandwidth allocation.

Wherein the calculating and allocating unit comprises:

And a difference allocation subunit, configured to allocate the bandwidth difference to all the tunnel out ports under the expansion physical port.

In the distribution system, when the first sub-port of the expansion physical port is no longer used as the tunnel egress port, the reserved bandwidth of the first sub-port is the bandwidth allocated by the first sub-port. a difference, wherein the first sub-port is a port of at least one Layer 3 sub-port configured in advance on the expansion physical port.

The above technical solution of the present invention at least includes the following beneficial effects:

The foregoing technical solution of the present invention calculates and allocates the reserved bandwidth of the outbound interface of the tunnel according to the basic bandwidth of the outbound port of the tunnel and the maximum physical bandwidth of the physical port, so as to ensure that the QoS can be performed according to the service after the capacity expansion. Scheduling to ensure operation and maintenance efficiency.

DRAWINGS

1 is a schematic flowchart of a method for allocating a reserved bandwidth of a tunnel egress port according to an embodiment of the present invention;

2 is a schematic structural diagram of a system for allocating a reserved bandwidth of a tunnel out port according to an embodiment of the present invention;

FIG. 3 is a schematic diagram showing a expansion environment of a specific embodiment of the present invention.

detailed description

The technical problems, the technical solutions, and the advantages of the present invention will be more clearly described in conjunction with the accompanying drawings and specific embodiments.

FIG. 1 is a schematic flowchart of a method for allocating a reserved bandwidth of a tunnel out port according to an embodiment of the present disclosure. The disclosure provides a method for allocating a reserved bandwidth of a tunnel out port according to an existing problem. Methods include:

In step 101, in the network element expansion process, all the tunnel outbound ports under the physical port are expanded, and the basic bandwidth of each outbound port is calculated. The basic bandwidth includes the tunnel bandwidth assumed by each tunnel outbound port.

Here, in the network element expansion process, the tunnel is determined according to the expanded network element, the expanded network element, and the fiber link between the extended network element and the extended network element, and the label and the tunnel out port are re-allocated for the relevant tunnel. And calculate the base bandwidth of each tunnel out port. The basic bandwidth of each tunnel outbound port includes at least the tunnel bandwidth that each tunnel outbound port needs to bear.

Step 102: Calculate and allocate a reserved bandwidth of the tunnel outbound port according to the basic bandwidth of the outbound port of the tunnel and the maximum physical bandwidth of the expanded physical port, where the reserved bandwidth includes the basic bandwidth.

Here, the required reserved bandwidth of each tunnel out port is calculated and allocated through the base bandwidth and the maximum physical bandwidth of the expanded physical port. The maximum physical bandwidth is the maximum bandwidth that can be tolerated by the physical port settings.

In this embodiment, the calculated bandwidth of the outbound port of the tunnel is calculated, and the reserved bandwidth in the process of capacity expansion of the network element is calculated according to the maximum physical bandwidth of the physical port and the basic bandwidth, thereby ensuring that the reserved bandwidth includes at least the basic bandwidth and ensuring the network element. After capacity expansion, QoS scheduling can be performed according to services to ensure operation and maintenance efficiency.

As a preferred implementation manner of the foregoing embodiment of the present disclosure, in step 101, the step of calculating the basic bandwidth of each tunnel out port may include the following steps:

If yes, obtain the protection bandwidth of each tunnel outbound port, and calculate the sum of the protection bandwidth assumed by each tunnel outbound port and the tunnel bandwidth assumed by the outbound interface of the tunnel, and obtain the basic bandwidth of the outbound port of the tunnel;

Otherwise, the tunnel bandwidth assumed by each tunnel outbound port is used as the base bandwidth of the tunnel outbound port.

In the above steps, when it is determined that the expansion port exists in the protection ring network, the protection bandwidth required for the tunnel outbound port protection ring network needs to be calculated and obtained. Then, the basic bandwidth of each tunnel outbound port is assumed by the tunnel out port. The sum of the guard bandwidth and the tunnel bandwidth, that is, at each tunnel out port, the base bandwidth = protection bandwidth + tunnel bandwidth. When there is no guard ring network, the base bandwidth = tunnel bandwidth for each tunnel out port.

Further, for each tunnel egress port, the tunnel bandwidth assumed by the tunnel egress port is the sum of the bandwidth occupied by each tunnel to which the tunnel egress port belongs.

As a preferred implementation manner of the foregoing embodiment of the present invention, in step 102, the step of calculating and allocating the reserved bandwidth of the tunnel outbound port according to the basic bandwidth of the tunnel outbound port and the maximum physical bandwidth of the expanded physical port may include the following step:

Calculate the port bandwidth assumed by the capacity expansion port. The port bandwidth is the sum of the base bandwidths of all tunnel out ports.

Obtain the maximum physical bandwidth of the expanded physical port and determine the port bandwidth and the maximum physical bandwidth.

In the above two steps, the port bandwidth of the physical port is expanded according to the basic bandwidth. The bandwidth of the port is the sum of the basic bandwidth of all the tunnel ports on the physical port, and the bandwidth of the port and the maximum physical bandwidth of the physical port are expanded. Compare and judge the size of both.

When the maximum physical bandwidth is greater than or equal to the port bandwidth, the bandwidth difference between the maximum physical bandwidth and the port bandwidth is calculated, and the bandwidth difference is allocated to all the tunnel out ports of the expanded physical port, where the bandwidth difference is the maximum physical The bandwidth is subtracted from the difference obtained by the port bandwidth. The reserved bandwidth of the tunnel outbound port includes the basic bandwidth of the outbound port of the tunnel and the difference in bandwidth.

In the above step, when the maximum physical bandwidth is greater than the port bandwidth, the bandwidth difference of the maximum physical bandwidth-port bandwidth is calculated, and the bandwidth difference is allocated to all the tunnel out ports of the expanded physical port. Generally, the average allocation is performed. To allocate the bandwidth difference to all the tunnel outbound ports of the physical port, for each tunnel outbound port, reserve bandwidth = base bandwidth + bandwidth difference / N, where N is the tunnel under the expanded physical port. The number of outgoing ports. When the maximum physical bandwidth is equal to the port bandwidth, the bandwidth difference between the maximum physical bandwidth and the port bandwidth is 0. At this time, for each tunnel out port, the reserved bandwidth = the base bandwidth.

In the above steps, when the maximum physical bandwidth is less than the port bandwidth, the port bandwidth exceeds the set maximum range. The CAC (Connectivity Allow Control) check fails, the capacity expansion fails, and the reserved bandwidth allocation ends.

In addition, in the reserved bandwidth allocation process, when the first sub-port of the physical port is no longer used as the tunnel egress port, and the first sub-port is the port of at least one of the three-layer sub-ports configured in the pre-expanded physical port, The reserved bandwidth of the first sub-port is the bandwidth difference of the first sub-port, that is, the reserved bandwidth of the sub-port = the bandwidth difference of the sub-port.

In a specific embodiment of the present invention, as shown in FIG. 3, the network element C is expanded between the network element A and the network element B, so that the network The element C is interconnected with the network element A and the network element B, respectively. The information of the Layer 3 sub-ports of the physical ports interconnected by the network elements A and B, the VLAN (Virtual Local Area Network), and the IP network segment information are expanded into the network element C and the network element A to be expanded. The physical port that is connected to the B is configured to generate the corresponding Layer 3 sub-ports, and the interconnected Layer 3 sub-ports are exported in the cache. The outbound interface and the outgoing label are redistributed to generate the physical port of the network element C. A tunnel P node that communicates with the tunnels in the physical port of the network element A and B. The tunnel bandwidth of each tunnel outbound port under the physical port of the expansion of the network between A and B is obtained. At this time, it is determined whether the expanded physical port exists in the protection ring network, and if so, the ring network protection group of the expanded physical port that is connected to the network element A and the network through the network element A and the B is created. The basic bandwidth of the outbound interface of the tunnel is equal to the sum of the protection bandwidth plus the tunnel bandwidth assumed by the outbound interface of the tunnel; otherwise, the basic bandwidth of the outbound interface of the tunnel is equal to The tunnel bandwidth assumed by the outbound port of the tunnel.

Obtain the maximum physical bandwidth of the physical port that is connected to the interconnected physical ports of the network, and calculate the total bandwidth of all the outbound ports of each of the expanded physical ports to obtain the bandwidth of each port. Bandwidth and port bandwidth size. Here, after the NE is expanded, the QoS scheduling can be performed according to the service. The capacity of the expansion port is required to meet the requirements of the CAC. Therefore, when the maximum physical bandwidth is smaller than the port bandwidth, the capacity expansion fails, the process is interrupted, and the allocation is terminated. When the maximum physical bandwidth is greater than or equal to the port. When the bandwidth is calculated, the bandwidth difference between the maximum physical bandwidth and the port bandwidth is calculated, and the bandwidth difference is evenly distributed to all the tunnel out ports of the expanded physical port. The reserved bandwidth of each tunnel outbound port is obtained as the base bandwidth + bandwidth. The difference /N, N is the number of all tunnel out ports under the capacity expansion physical port.

The outbound ports of the tunnels of the NEs A and B may be changed after the capacity expansion. The reserved bandwidth of the outbound interface of the tunnel meets the service requirements. The original tunnel outbound ports that are no longer used are allocated only equally. The bandwidth difference (bandwidth difference / N) is used as the reserved bandwidth of the original tunnel out port.

To implement the method embodiment of the present disclosure, as shown in FIG. 2, an embodiment of the present invention further provides a tunnel out port reserved bandwidth allocation system, where the distribution system includes:

The calculation module 21 is configured to determine, in the network element expansion process, all the tunnel out ports of the expanded physical port, and calculate the basic bandwidth of each of the tunnel out ports, where the basic bandwidth includes each of the tunnel out The tunnel bandwidth assumed by the port;

The calculation and allocation module 22 is configured to calculate and allocate a reserved bandwidth of the tunnel out port according to the basic bandwidth of the tunnel out port and the maximum physical bandwidth of the expanded physical port, where the reserved bandwidth includes the Base bandwidth.

The computing module includes:

The calculation and allocation module includes:

The obtaining and determining unit is configured to obtain a maximum physical bandwidth of the expanded physical port, and determine a size of the port and the maximum physical bandwidth;

Wherein the calculating and allocating unit comprises:

The foregoing embodiment of the present invention calculates and allocates the reserved bandwidth of the outbound interface of the tunnel according to the basic bandwidth of the outbound port of the tunnel and the maximum physical bandwidth of the physical port to ensure that the QoS can be performed according to the service after the capacity expansion. Scheduling to ensure operation and maintenance efficiency.

The above is a preferred embodiment of the present invention, and it should be noted that those skilled in the art can also make several improvements and retouchings without departing from the principles of the present disclosure. It should be considered as the scope of protection of this disclosure.

Each module or unit in the system for allocating bandwidth of the tunnel out port reserved bandwidth provided by the embodiment of the present application may be controlled by one or more digital signal processors (DSPs), application specific integrated circuits (ASICs), processors, microprocessors, and controls. Implemented by a microcontroller, microcontroller, field programmable array (FPGA), programmable logic device, or other electronic unit, or any combination thereof. Some of the functions or processes described in this application embodiment may also be implemented by software executing on a processor.

For example, an embodiment of the present invention further provides a system for allocating a reserved bandwidth of a tunnel out port, including:

processor;

a memory, configured to store processor executable instructions;

Wherein the processor is configured to:

An exemplary embodiment of the present invention also provides a non-transitory computer readable storage medium including instructions executable by a processor in a distribution system of a tunnel out port reserved bandwidth to complete the tunnel out port reservation described above Bandwidth allocation method. For example, the non-transitory computer readable storage medium can be a read only memory (ROM), a random access memory (RAM), a CD-ROM, a magnetic tape, a floppy disk, and an optical data storage device.

Industrial applicability

The technical solution of the present application can be applied to the field of communications. Calculate and allocate the reserved bandwidth of the outbound interface of the tunnel based on the basic bandwidth of the outbound interface of the tunnel and the maximum physical bandwidth of the physical port to ensure that the QoS scheduling can be performed according to the service after the expansion. .

The above is only the specific embodiment of the present invention, but the scope of the present disclosure is not limited thereto, and any person skilled in the art can easily think of changes or substitutions within the technical scope of the present disclosure. It should be covered within the scope of protection of the present disclosure.

Claims

A method for allocating a reserved bandwidth of a tunnel out port, where the allocation method includes:

During the expansion of the network element, the tunnel outbound ports of the physical port are expanded, and the basic bandwidth of each of the outbound ports of the tunnel is calculated, where the basic bandwidth includes the tunnel bandwidth assumed by each outbound port of the tunnel;

Calculating and allocating a reserved bandwidth of the tunnel egress port according to the basic bandwidth of the tunnel egress port and the maximum physical bandwidth of the expanded physical port, where the reserved bandwidth includes the basic bandwidth.
The distribution method according to claim 1, wherein the calculating the basic bandwidth of each of the tunnel out ports comprises:

Determining whether the expanded physical port exists in a protection ring network;

If yes, the protection bandwidth of each of the outbound ports of the tunnel is obtained, and the sum of the protection bandwidth of each of the outbound ports of the tunnel and the tunnel bandwidth assumed by the outbound port of the tunnel is calculated, and the basic bandwidth of the outbound port of the tunnel is obtained;

Otherwise, the tunnel bandwidth assumed by each of the tunnel outbound ports is used as the base bandwidth of the tunnel outbound port.
The distribution method according to claim 2, wherein

The tunnel bandwidth assumed by the outbound interface of the tunnel is the sum of the bandwidth occupied by each tunnel to which the outbound interface of the tunnel belongs.
The allocation method according to any one of claims 1-3, wherein the calculating and allocating a reservation of the tunnel out port according to the base bandwidth of the tunnel out port and the maximum physical bandwidth of the expanded physical port The steps for bandwidth include:

Calculating a port bandwidth assumed by the capacity expansion port, where the port bandwidth is a sum of base bandwidths of all the tunnel out ports;

Obtaining a maximum physical bandwidth of the expanded physical port, and determining a size of the port and the maximum physical bandwidth;

When the maximum physical bandwidth is greater than or equal to the port bandwidth, calculating a bandwidth difference between the maximum physical bandwidth and the port bandwidth, and allocating the bandwidth difference to all of the expanded physical ports The tunnel egress port, wherein the bandwidth difference is the difference between the maximum physical bandwidth minus the port bandwidth, and the reserved bandwidth of the tunnel egress port includes the basic bandwidth of the tunnel egress port and the corresponding Bandwidth difference;

When the maximum physical bandwidth is smaller than the port bandwidth, it is determined that the current capacity expansion fails, and the reserved bandwidth allocation is ended.
The method of claim 4, wherein the step of allocating the bandwidth difference to all of the tunnel out ports under the expanded physical port comprises:

The bandwidth difference is evenly distributed to all the tunnel out ports under the capacity expansion physical port.
The distribution method according to claim 4, wherein when the first sub-port of the expansion physical port is no longer used as the tunnel egress port, the reserved bandwidth of the first sub-port is the first sub-port The bandwidth difference obtained, wherein the first sub-port is a port of at least one Layer 3 sub-port configured in advance on the expansion physical port.
A system for allocating a reserved bandwidth of a tunnel out port, wherein the distribution system includes:

The calculation module is configured to determine, in the network element expansion process, all the tunnel out ports of the expanded physical port, and calculate the basic bandwidth of each of the tunnel out ports, where the basic bandwidth includes each of the tunnel out ports The tunnel bandwidth assumed;

a calculation and allocation module, configured to calculate and allocate a reserved bandwidth of the tunnel outbound port according to a basic bandwidth of the tunnel outbound port and a maximum physical bandwidth of the expanded physical port, where the reserved bandwidth includes the basic bandwidth.
The distribution system of claim 7 wherein said computing module comprises:

The determining unit is configured to determine whether the expanded physical port exists in a guard ring network, and if yes, execute the first calculating unit, otherwise, execute the second calculating unit;

The first calculating unit is configured to acquire, according to the triggering of the determining unit, the protection bandwidth assumed by each of the outbound ports of the tunnel, and calculate the protection bandwidth assumed by each outbound port of the tunnel and the tunnel bandwidth assumed by the outbound port of the tunnel And the value, get the base bandwidth of the tunnel out port;

The second calculating unit is configured to use the tunnel bandwidth assumed by each of the tunnel outbound ports as the basic bandwidth of the tunnel outbound port according to the triggering of the determining unit.
The distribution system according to claim 8, wherein

The tunnel bandwidth assumed by the outbound interface of the tunnel is the sum of the bandwidth occupied by each tunnel to which the outbound interface of the tunnel belongs.
A distribution system according to any one of claims 7-9, wherein the calculation and allocation module comprises:

a third computing unit, configured to calculate a port bandwidth assumed by the capacity expansion port, where the port bandwidth is a sum of base bandwidths of all the tunnel out ports;

The obtaining and determining unit is configured to obtain a maximum physical bandwidth of the expanded physical port, and determine a size of the port and the maximum physical bandwidth;

a calculating and allocating unit, configured to calculate a bandwidth difference between the maximum physical bandwidth and the port bandwidth when the maximum physical bandwidth is greater than or equal to the port bandwidth, and allocate the bandwidth difference to the All the tunnel out ports of the physical port are expanded, wherein the bandwidth difference is the difference between the maximum physical bandwidth minus the port bandwidth, and the reserved bandwidth of the tunnel out port includes the tunnel out The base bandwidth of the port and the difference in bandwidth value;

The ending unit is configured to determine that the current capacity expansion fails when the maximum physical bandwidth is less than the port bandwidth, and end the reserved bandwidth allocation.
The distribution system of claim 10 wherein said calculating and distributing unit comprises:

And a difference allocation subunit, configured to allocate the bandwidth difference to all the tunnel out ports under the expansion physical port.
The distribution system according to claim 10, wherein when the first sub-port of the expansion physical port is no longer used as the tunnel egress port, the reserved bandwidth of the first sub-port is the first sub-port The bandwidth difference obtained, wherein the first sub-port is a port of at least one Layer 3 sub-port configured in advance on the expansion physical port.