CN111447122A

CN111447122A - Test system and test method for IPC tape amount of core switch

Info

Publication number: CN111447122A
Application number: CN202010436419.7A
Authority: CN
Inventors: 蔡玲
Original assignee: Shenzhen Tenda Technology Co Ltd
Current assignee: Shenzhen Tenda Technology Co Ltd
Priority date: 2020-05-21
Filing date: 2020-05-21
Publication date: 2020-07-24
Anticipated expiration: 2040-05-21
Also published as: CN111447122B

Abstract

The invention provides a system and a method for testing the IPC tape amount of a core switch, belonging to the field of switch testing. The test system comprises a management switch, an NVR and more than one access switch, wherein one end of a core switch to be tested is connected with the NVR, the other end of the core switch to be tested is connected with the management switch, downlink ports of the management switch are respectively connected with a plurality of network cameras, the network cameras are respectively connected with the core switch to be tested through an uplink port of the management switch, one end of the access switch is connected with a plurality of network cameras, the other end of the access switch is connected with one of the downlink ports of the management switch, and a video stream of any one of the network cameras connected with the access switch can be broadcasted to each uplink port of the management switch, which is connected with the core switch. The invention saves the NVR cost and the network camera cost.

Description

Test system and test method for IPC tape amount of core switch

Technical Field

The invention relates to the field of switch testing, in particular to a system and a method for testing the IPC tape amount of a core switch.

Background

In an actual monitoring application scenario, a gigabit switch is often used as a core-level switch, a lower level is connected to a plurality of access-layer switches to carry a plurality of IPCs (IP cameras), and as for how to evaluate the IPC carrying capability of the core-level switch, it is firstly thought that the actual IPCs are continuously loaded, the monitoring screen is watched through accessing NVR (Network Video Recorder), and the number of IPCs carried by the switch is actually measured. The cost brought by the actual measurement mode is high and is limited by the processing capacity of the NVR, and the method mainly has two aspects:

the number of channels and the capability of processing video streams of the NVR are limited, and the NVR with 64 channels generally processes only 256Mbps data, which means that the NVR can process 64 video streams with about 265Mbps IPC. Beyond this limit, the unprocessed IPC video stream will be dropped at the NVR end, causing video katon, but for a gigabit switch, 256Mbps is far from the bandwidth it can forward. Under the condition, multiple NVRs need to be expanded to meet the load capacity of test gigabit transmission

2. According to the estimation of gigabit bandwidth and IPC burst code stream 16M, if burst at the same time, at least 62 IPCs are carried, and in the actual situation, the situation that all IPCs are concurrent at the same time is rare, and often part of IPCs are concurrent, the number of the carried IPCs is larger than 62. And under the condition that the IPC defaults to open the flow control, the number of the loads is greatly increased, so that more IPCs are needed to meet the actual measurement requirement.

Therefore, the existing test method has the following defects:

1. measuring the belt conveyor quantity through experiments: for the capability test of carrying the IPC by the gigabit core switch, the ports are required to be fully loaded and accessed to the actual IPC for testing, the number of the IPC is required to be 100-200, and in addition, the number of the channels of the NVR and the capability of processing the video stream are limited, a plurality of NVRs are required to be tested simultaneously, and the cost is high.

2. By estimating the belt machine quantity: for the switches which are hundreds of megabytes and the lower links of the switches can not be accessed to other switches any more to extend the access IPC number, the estimated tape unit number may have a reference value, but for the multi-port gigabit switch which is more to extend the access IPC number, the cache size of the switch determines the capability of the switch for processing the concurrent flow, and further limits the tape unit number of the switch. The tape unit volumes of the gigabit switch are the same in a unified calculation mode, and in fact, the tape unit volumes of different cache sizes and different chips are inconsistent. Therefore, the actual amount of the belt threading cannot be accurately calculated.

Disclosure of Invention

In order to solve the problems in testing the IPC tape amount of the gigabit switch in the prior art, the invention provides a system and a method for testing the IPC tape amount of a core switch, wherein the IPC flow is copied and forwarded in the switch in multiple copies, so that the IPC, NVR and the number of access switches are saved.

The test system of the invention comprises a management switch, NVR and more than one access switch, wherein,

one end of the core switch to be tested is connected with the NVR, the other end of the core switch to be tested is connected with N ports of an uplink port of the management switch through N ports, N is a positive integer,

n ports in the downstream ports of the management switch are respectively connected with a network camera, the network cameras are respectively connected with a core switch to be tested through the upstream port of the management switch,

one end of the access switch is connected with M network cameras, the other end of the access switch is connected with one downlink port of the management switch, the video stream of any network camera connected with the access switch can be broadcasted to each uplink port of the management switch, which is connected with the core switch, and M is a positive integer.

The invention further improves, the management type switch is a switch with MAC address learning closing function and QV L AN function, and the duplication of the network camera flow is realized through the two functions.

The invention is further improved, and the core switch and the access switch to be tested are kilomega switches.

The invention is further improved, and the number of the management type switches is 1 or more.

The invention also provides a test method of the test system based on the IPC tape amount of the core switch, which comprises the following steps:

s1: configuring management type switch parameters, building a test system, and connecting ports of a core switch to be tested, a management type switch and an NVR (network video recorder) according to topology;

s2: the N network cameras are accessed to the ports of the management type switch and are managed through the NVR;

s3: establishing a video stream replication model: connecting the access switch and the management switch, connecting the network cameras on the access switch one by one, monitoring the network camera on the NVR when one network camera is accessed, and observing the video flow of the NVR until the network camera connected with the switch is blocked;

s4: reducing the network cameras one by one until the network cameras connected with the switch start not to be blocked;

s5: and calculating the tape unit amount of the core switch.

The invention is further improved, the management switch is connected with 8 network cameras, and the tape amount calculation method of the core switch comprises the following steps: the tape recorder amount is 8+ the number of network cameras connected to the access switch.

Compared with the prior art, the invention has the beneficial effects that: (1) NVR cost is saved. The NVR only processes one video flow of each IPC, other flows only occupy the bandwidth and do not occupy the resource of the NVR for processing the video flow, and the bandwidth of the NVR giga does not have a bottleneck. (2) IPC cost is saved. If links of the core switch and the management switch are increased, the number of IPC is multiplied, IPC parameters can be adjusted at will for testing, and the number of the actual cameras is not large. (3) The number of the access switches is saved, and 1 access switch can simulate a plurality of switches. (4) The result of the tape machine amount has higher reference value because all forwarded in the cache of the core switch is the video traffic of IPC reality.

Drawings

FIG. 1 is a schematic structural diagram of an embodiment of a test system according to the present invention;

fig. 2 is a schematic view of video stream replication.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples.

As shown in FIG. 1, the test system of the invention comprises a management switch B, an NVR and an access switch C, wherein one end of a core switch A to be tested is connected with the NVR, the other end of the core switch A to be tested is connected with 8 ports (ports 11-18) of an uplink port of the management switch through 8 ports, 8 ports (ports 1-8) in downlink ports of the management switch B are respectively connected with IPCs (IPCs 1-8), the IPCs are respectively connected with the core switch A to be tested through an uplink port, one end of the access switch C is connected with 8 IPCs (IPCs 9-16), and the other end of the access switch C is connected with a port 24 of the management switch B.

Of course, the number of managed switches in this example may be multiple, each managed switch may also have access to multiple access switches, and the number of IPCs connected to the managed switches and the access switches may also be set to other numbers according to requirements. The flow resource of IPC can be adjusted according to the code stream configuration on IPC, and if the limit value needs to be tested, the IPC code stream is adjusted to the maximum value.

In the embodiment, under the condition that IPC, NVR and access layer switch test resources are limited, the core layer switch can be subjected to a tape-on-machine test, and the method has high reference value.

Specifically, the tested device is a gigabit core switch a, the example is 9 ports, and the management switch B is used as the tested device, which is the key of the testing method, and the testing method has AN MAC address learning closing function and a QV L AN function, and IPC traffic can be copied through the two functions.

The test method comprises the following steps:

(1) parameters of the managed switch B are configured, and the managed switch B is set as shown in table 1. No configuration is done on the access switch C but no bottleneck should exist on the upstream port, preferably a gigabit connection.

TABLE 1

The reason why the P11-P18 do not learn the MAC address in this example is as follows:

firstly, the switch forwarding principle is that after receiving a message, a switch port searches a destination port corresponding to AN MAC address in a switch address table according to the destination MAC address in the message, and then forwards the message from the destination port, and if the destination address cannot be searched, the switch forwards the message to all ports in V L AN in a broadcasting mode.

The NVR and the IPC generally adopt a unicast mode to forward the interactive messages of the NVR and the IPC in the switch, when the addresses of the NVR are not learned by the P11-P18, the video streams sent by the IPC 1-IPC 8 are broadcasted into the V L AN corresponding to the ports, for example, the video stream accessed to the IPC1 by the P1 port is forwarded to the P11 and the P24.

The video stream forwarded to the port P11 is unicast forwarded to NVR through the core switch a, and the response message of NVR is also forwarded to the destination port in switch a according to the MAC address of IPC 1. And then the message is forwarded to P1 according to the PVID of P11 and the destination MAC address of the NVR response message after the message arrives at P11 of the switch B, and then IPC1 receives the NVR response message.

The video stream forwarded to the port P24 is discarded at the entrance after being transmitted to the switch C, because the MAC address of the NVR can be learned at the uplink port of the switch C, the destination address of the video stream is at the port where the video stream enters, and therefore bandwidth congestion caused by the fact that the video stream of the IPC1 is broadcasted to the IPC accessed by the switch C is avoided.

The number of access switches C in this example can be increased at will, but a configuration of V L AN should be added to the port connected to the managed switch B, and the configuration of the port V L AN is similar to the above-mentioned managed switch P24 port.

In the embodiment, the QV L AN is arranged to avoid loop and broadcast storm, and because more IPC video streams are dozens of M, the video streams of IPC 1-IPC 16 are prevented from receiving each other and occupying transmission bandwidth.

(2) Firstly, connecting the ports of a core switch A and a management switch B, NVR according to topology;

(3) accessing IPCs 1-8 to a B port of a management switch, and managing IPCs 1-8 through NVR;

(4) connecting access switch C and management type switch B, accessing IPC9 ~ 16 one by one again, whenever accessing an IPC, monitor this IPC on NVR, observe NVR video traffic, whenever increasing the access of 1 IPC, the input flow of NVR end increases 8 times of 1 IPC traffic. A model of video stream replication, as shown in FIG. 2;

(5) and observing whether IPCs 1-8 are stuck or not. IPCs 1-8 are IPCs used as video quality references, because the 8 IPCs have only one code stream forwarded to NVR at each entry, if the 8 IPCs are jammed, it is indicated that congestion occurs in the cache at the entry A of the core switch;

(6) adding IPC to the access switch C, not limited to IPC 9-16, adding more IPC (preempting the video stream buffered by the core switch A) until IPC1-8 is stuck, which indicates that the core switch exceeds the processable data volume, and then beginning to reduce IPC until IPC1-8 begins not to be stuck;

(7) the tape volume of the core switch C is calculated according to the following formula:

tape machine quantity 8(IPC1-8) + IPC number 8 connected to access switch C

According to the above embodiment, if the number of IPCs connected to the access switch C can be 24, the number of the tape-out devices is 8+24 × 8 — 200, and only 32 IPCs are actually used, which can replace the test of 200 IPCs.

Therefore, the invention has the following outstanding advantages:

1.NVR cost is saved. The NVR only processes one video flow of each IPC, other flows only occupy the bandwidth and cannot occupy the resource of the video flow processed by the NVR, and the bandwidth of NVR giga does not have a bottleneck;

2. IPC cost is saved. According to the above example, if the links of the core switch a and the management switch B are increased, the number of IPCs is increased by 24 times, if the IPCs on the access layer switch C are increased, the number of IPCs is increased by 8 times, the IPC parameters can be adjusted arbitrarily for testing, but the number of the actual cameras is not large;

3. the number of the access switches C is saved, and 8 access switches C can be simulated by 1 access switch C;

4. the result of the tape machine amount has higher reference value because all forwarded in the cache of the core switch A are IPC actual video traffic.

The above-described embodiments are intended to be illustrative, and not restrictive, of the invention, and all changes that come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Claims

1. A test system of core switch IPC tape machine volume which characterized in that: comprising a management switch, NVR, and one or more access switches, wherein,

2. The system for testing the IPC tape amount of the core switch as claimed in claim 1, wherein the managed switch is a switch having MAC address learning closing function and QV L AN function, and the duplication of the network camera flow is realized through the two functions.

3. The system for testing the IPC tape amount of the core switch as claimed in claim 1, wherein: the core switch and the access switch to be tested are gigabit switches.

4. The system for testing the IPC tape amount of the core switch as claimed in claim 1, wherein: the number of the management type switches is 1 or more.

5. A test method of a test system of a core switch IPC tape machine based on any claim 1 to 4 is characterized by comprising the following steps:

s5: and calculating the tape unit amount of the core switch.

6. The test method of claim 4, wherein: the management type switch is connected with 8 network cameras, and the tape amount calculation method of the core switch comprises the following steps: the tape recorder amount is 8+ the number of network cameras connected to the access switch.