CN1917452A - Method for testing forwarding performance of Ethernet exchange, and method for configuring network - Google Patents
Method for testing forwarding performance of Ethernet exchange, and method for configuring network Download PDFInfo
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- CN1917452A CN1917452A CN 200510028937 CN200510028937A CN1917452A CN 1917452 A CN1917452 A CN 1917452A CN 200510028937 CN200510028937 CN 200510028937 CN 200510028937 A CN200510028937 A CN 200510028937A CN 1917452 A CN1917452 A CN 1917452A
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Abstract
The invention comprises the following steps: the port of network test device is connected to the network port of exchange; using network port simulated by the network test device to simulate the user in network, and meanwhile sending and receiving the test data message; examining the data receiving state to determine the forwarding performance of the exchange; the port of tested Ethernet exchange is connected to the port of network tester; wherein two testing ports are used to test several ports of the exchange.
Description
Technical field
The present invention relates to the measuring technology of Ethernet switch, more particularly, relate to a kind of method and network collocating method thereof of testing the Ethernet switch forwarding performance.
Background technology
Along with the development of data communication technology, the performance of Ethernet switch is greatly improved, and port speed is from the 10M bps of the nineties, and 100M bps develops into the 1000M bps of today, 10000M bps gradually.In order to realize the surface speed forwarding (promptly transmitting according to the maximum rate of port) between each port of switch, switch need have bigger Gbps.In general, the Gbps of switch need be equal to or greater than the summation of the most significant end mouth speed of switch all of the port, could guarantee that switch is according to the surface speed forwarding data.
When comparing switch backplane bandwidth, forwarding performance, usually used network test equipment such as Smartbits, Ixia in the past.Its basic principle is that the network interface of network test equipment is continuous with the network interface of switch, with user in the network interface analog network of network test equipment, send simultaneously and the acceptance test data message,, judge the forwarding performance of switch by the reception condition of checkout data.
Except test throughput, also need to carry out the pressure test of high amount of traffic amount in the development of switch.Testing throughput with the front is similar, also needs to inject data to all of the port of switch, makes the switch full load, checks the working condition of switch under the full load situation.
With reference to the method for testing of Ethernet switch of the prior art shown in Figure 1, all of the port of tested Ethernet switch 102 all links to each other with the port of network tester 104.Solid line among the figure is represented the actual physical line, and dotted line is represented the direction of data flow.The port one of network tester 104 sends test data stream data flow1, enters the port one of switch 102, through transmitting, flows out from port 2, arrives the port 2 of network tester 104.The port 2 of network tester 104 sends test data stream data flow2, through the forwarding of switch 102, arrives the port one of tester 104.
Same, port 3 to 6 also sends and the acceptance test data flow.By checking that port one to 6 receives the situation of message, just can test out the forwarding performance of switch.
Adopt method as shown in Figure 1 that switch is tested, just need testing equipment itself to have with switch suitable port number and port speed.The price of network test equipment is very expensive, and equipment development manufacturer usually only can buy less test port for saving cost.The port number of nowadays large-scale carrier class switch often can reach hundreds of ports, and Gbps can reach G up to a hundred, and existing testing equipment is difficult to the port number that reaches suitable.
So, just need a kind of port that can utilize negligible amounts to come the technology that a fairly large number of switch ports themselves is tested in the art.
Summary of the invention
Thereby the purpose of this invention is to provide a kind of method of testing the Ethernet switch forwarding performance makes minimum test port number just can produce the input that enough test data flows are saved testing equipment.
According to an aspect of the present invention, a kind of network collocating method of testing the Ethernet switch forwarding performance is provided, the port of network test equipment links to each other with the network interface of switch, with user in the network interface analog network of network test equipment, send simultaneously and the acceptance test data message, the reception condition of checkout data, the forwarding performance of judgement switch; The port of tested Ethernet switch links to each other with the port of network tester, uses two test ports, has tested several ports of switch, and concrete collocation method is as follows:
A. it is right to connect following port with netting twine: first test port and switch ports themselves first port, and the last port of second test port and switch ports themselves, all the other ports of switch match in twos;
B. the switch ports themselves that will match in twos is configured to several VLANs respectively;
C., the port attribute value of the switch ports themselves of pairing in twos is set respectively, and each is to the port attribute value difference of port;
D. close the generation tree or the rapid spanning-tree function of switch, close the GVRP function.
According to one embodiment of the invention, at any one time point, all ports and VLAN are carrying out exchanges data.
According to one embodiment of the invention, the port attribute value that is provided with among the described step c is the PVID value.
According to one embodiment of the invention, be used to have the switch of 2n port, wherein n is an integer.
According to one embodiment of the invention, be used for switch is carried out the pressure test of big data quantity.
According to one embodiment of the invention, if message dropping then adopts dichotomy, choose half test throughput of port tandem queue in the test at every turn, intercept the mid point of tandem queue repeatedly, to find the port of losing message right.
According to a further aspect in the invention, provide a kind of method of testing the Ethernet switch forwarding performance, adopt the network of above-mentioned method configuration, the handling process of test data is as follows:
A. first data flow enters first port of switch, because first port has the first port attribute value, first data flow is transmitted in first VLAN;
B. the port in first VLAN is connected with port in second VLAN, first data flow enters the port in second VLAN, because the port of second VLAN has the second port attribute value, first data flow is transmitted in second VLAN;
C. similar, first data flow has entered again in his VLAN, finally flows out from last port, enters second port of network testing instrument;
D. same, second port of network tester generates test data second data flow, transmits in several VLANs successively, finally arrives first port of tester.
According to one embodiment of the invention, can reach surface speed forwarding during test.
According to one embodiment of the invention, at any one time point, all ports and VLAN are carrying out exchanges data.
According to one embodiment of the invention, be used to test switch with 2n port, wherein n is an integer.
Adopt the present invention, thereby adopt disclosed technical scheme to provide a kind of method of testing the Ethernet switch forwarding performance to make minimum test port number just can produce the input that enough test data flows are saved testing equipment.
Description of drawings
The above and other feature of the present invention, character and advantage will further describe below in conjunction with the accompanying drawings and embodiments, and identical in the accompanying drawings Reference numeral is represented identical feature all the time, wherein,
Fig. 1 is the schematic diagram of general method of testing.
Fig. 2 is the schematic diagram of method of testing according to an embodiment of the invention.
Embodiment
Further specify technical scheme of the present invention below.
At first, define for the term that hereinafter will use:
1) Ethernet switch: be a kind of, can finish the network equipment of encapsulate forwarded packet function based on MAC (hardware address of network interface card) identification.Switch can " study " MAC Address, and it is left in the internal table of addresses, by set up interim switching path between the originator of Frame and target receiver, makes Frame directly arrive destination address by source address.
2) linear speed: switch is transmitted the theoretical maximum of data.
3) Gbps: the Gbps of switch is the maximum amount of data that can handle up between exchange interface processor or interface card and data/address bus.The Gbps sign the total data exchange capability of switch, unit is Gbps, also is switching bandwidth, the Gbps of general switch does not wait to Gbps up to a hundred from several Gbps.The Gbps of a switch is high more, can deal with data ability just strong more, but design cost also can be high more simultaneously
4) throughput: the max-forwards speed that switch can reach under the situation of packet loss not.
5) VLAN: the abbreviation that is English Virtual Local Area Network, Chinese " VLAN " by name, VLAN a kind ofly (notes Local Area Network equipment from dividing in logic, be not from physically dividing) become the network segment (littler local area network (LAN) LAN in other words conj.or perhaps) one by one, thus realize the Data Interchange Technology of virtual work group (unit)
6) PVID: be a configurable port attribute value.When common message entered switch, exchange opportunity was sent this message into the vlan that equals the pvid value according to the pvid value of this message entry port, transmits.
7) generate tree: IEEE 802.1D Spanning-Tree Protocol (Spanning Tree Protocol) detects when having loop on the network, and the automatic disconnection loop connects.When inter-exchange exists many to connect, will only start a topmost connection, and other connections are all blocked to fall, these connections are become standby connection.When main connection goes wrong, Spanning-Tree Protocol will be reinstated standby connection automatically and take over the main work that connects, without any need for manual intervention.
8) rapid spanning-tree: the improvement version of Spanning-Tree Protocol, can backward compatible generation set, can realize the quick forwarding of port.
9) GVRP:GVRP (GARP VLAN Registration Protocol, GARP VLAN log-in protocol) be a kind of application of GARP, it is safeguarded the VLAN dynamic registration information in the switch, and propagates this information in other switch based on the working mechanism of GARP.
Then with reference to figure 2, Fig. 2 shows the schematic diagram of method of testing according to an embodiment of the invention, is example with the test to Ethernet switch 102 with 6 ports equally, and the solid line among the figure is represented the actual physical line, and dotted line is represented the direction of data flow.
As shown in Figure 2, method of the present invention has only been used two test ports in the network tester 104, has just tested 6 ports of switch.The flow that actual flow is crossed switch is 3 times of flow summation of data flow1 and data flow2, and according to the present invention, at first the port arrangement with switch 102 and network tester 104 is as follows:
1. it is right to connect following port with netting twine: network tester 104 port ones and switch 102 port ones, and network tester 104 ports 2 link to each other with switch 102 ports 6, and switch 102 ports 2 link to each other with port 3, and switch 102 ports 4 link to each other with port 5.
2. the port one, 2 with switch 102 is configured to VLAN 1, and port 3,4 is configured to VLAN 2; Port 5,6 is configured to VLAN 3.
3. the port one of switch 102 is set, and 2 port attribute value is 1, and the port attribute value of port 3,4 is 2, and the port attribute value of port 5,6 is 3.Can in the VLAN of this ports port property value appointment, transmit so that flow into the data flow of switch ports themselves like this.
4. close the generation tree or the rapid spanning-tree function of switch, close GVRP.
According to method of testing of the present invention, the handling process of test data stream is as follows:
At first, data flow1 enters the port one of switch 102 from the port one of network tester 104, because the port attribute value of switch 102 port ones is 1, data flow1 transmits in VLAN 1.Have only two member ports 1 and 2 in the VLAN 1, data flow1 transmits from port 2.
Then port 2 is connected data flow1 entry port 3 with port 3 usefulness netting twines.Because the port attribute value of port 3 is 2, data flow1 transmits in the port attribute value is 2 VLAN.
Last similarly data flow1 is entry port 5 again, transmits in the port attribute value is 3 VLAN, finally flows out from port 6, enters the port 2 of network testing instrument 104.
Same, the port 2 of network tester generates test data data flow2, transmits in the port attribute value is 3,2,1 VLAN successively, finally arrives the port one of tester.Equipment under test has only 6 ports, for having the more switch of multiport, as long as it is just passable to divide more VLAN.
For a person skilled in the art, according on regard to the description of the example of 6 ports, can easily learn, for switch with n port, can adopt similar method to test equally, therefore, network collocating method of the present invention and method of testing can be summarized as follows:
A kind of network collocating method of testing the Ethernet switch forwarding performance, the port of network test equipment links to each other with the network interface of switch, with user in the network interface analog network of network test equipment, send simultaneously and the acceptance test data message, the reception condition of checkout data, the forwarding performance of judgement switch; The port of tested Ethernet switch links to each other with the port of network tester, uses two test ports, has tested several ports of switch, and concrete collocation method is as follows:
A. it is right to connect following port with netting twine: first test port and switch ports themselves first port, and the last port of second test port and switch ports themselves, all the other ports of switch match in twos;
B. the switch ports themselves that will match in twos is configured to several VLANs respectively;
C., the port attribute value of the switch ports themselves of pairing in twos is set respectively, and each is to the port attribute value difference of port; According to one embodiment of the invention, the port attribute value that is provided with in this step is the PVID value.
D. close the generation tree or the rapid spanning-tree function of switch, close the GVRP function.
Pervert the law for network configuration of the present invention, at any one time point, all ports and VLAN are carrying out exchanges data.This method can be used for switch is carried out the pressure test of big data quantity.
If message dropping then adopts dichotomy, choose half test throughput of port tandem queue in the test at every turn, intercept the mid point of tandem queue repeatedly, to find the port of losing message right.
The method of test Ethernet switch forwarding performance of the present invention can reduce, and adopts the network of above-mentioned method configuration, and the handling process of test data is as follows:
A. first data flow enters first port of switch, because first port has the first port attribute value, first data flow is transmitted in first VLAN;
B. the port in first VLAN is connected with port in second VLAN, first data flow enters the port in second VLAN, because the port of second VLAN has the second port attribute value, first data flow is transmitted in second VLAN;
C. similar, first data flow has entered again in his VLAN, finally flows out from last port, enters second port of network testing instrument;
D. same, second port of network tester generates test data second data flow, transmits in several VLANs successively, finally arrives first port of tester.
Adopt this kind method of testing, can reach surface speed forwarding during test.Equally, at any one time point, all ports and VLAN are carrying out exchanges data.
All switches with 2n (wherein n is an integer) switch ports themselves can adopt network collocating method recited above and method of testing to test.
When using method of testing of the present invention to test, should be noted that the following aspects:
1) the GVRP function need be closed, and prevents dynamic registration VLAN, causes confusion.
2) need close generation tree, rapid spanning-tree, otherwise exchange opportunity is closed the port port lower to medium priority that link to each other.
Introduce a test case that adopts method of testing of the present invention to carry out below: it uses the IXIA network tester a 24+2 type 100 m ethernet switch to be carried out the data flow detection messages of test.Wherein disposed 4 VLANs, port one, 2 belongs to VLAN 1,3,4 and belongs to VLAN 2,5,6 and belong to VLAN 3,7,8 and belong to VLAN 4.
The fast detecting mode can reach surface speed forwarding when testing under this mode:
Trial?1：
Frame?Size 64 512 1518
Pair1?TxTput(fps) 148810 23496 8127
％TxTput 100.00?100.00?100.00
Pair2TxTput(fps) 148810 23496 8127
％TxTput 100.00?100.00?100.00
AvgRate(fps) 148810 23496 8127
Tolerance(％) 0 0 0
Use method of testing test time-delay of the present invention, promptly each message turnover switch is four times:
Trial?1：
Frame?Size 64 512 1518
Pair1?TxFrames?1488100 234960 81270
RxFrames 1488100 234960 81270
Latency(ns) 32680 176000 497920
Pair2?TxFrames?1488100 234960 81270
RxFrames 1488100 234960 81270
Latency(ns) 32640 176000 497920
％MaxRate 100 100 100
TotalTxFrames 2976200 469920 162540
TotalRxFrames 2976200 469920 162540
TotalLoss(％) 0.000 0.000 0.000
AvgLatency(ns)?32660 176000 497920
Use common mode test time-delay as shown in Figure 1, promptly each message turnover switch is once:
Trial?1：
Frame?Size 64 512 1518
Pair1?TxFrames?1488100 234960 81270
RxFrames 1488100 234960 81270
Latency(ns) 9360 45240 125640
Pair2?TxFrames?1488100 234960 81270
RxFrames 1488100 234960 81270
Latency(ns) 9360 45240 125720
％MaxRate 100 100 100
TotalTxFrames 2976200 469920 162540
TotalRxFrames 2976200 469920 162540
TotalLoss(％) 0.000 0.000 0.000
AvgLatency(ns) 9360 45240 125680
Adopt the present invention, thereby adopt disclosed technical scheme to provide a kind of method of testing the Ethernet switch forwarding performance to make minimum test port number just can produce the input that enough test data flows are saved testing equipment.
Though technical scheme of the present invention is illustrated in conjunction with preferred embodiment; but it should be appreciated by those skilled in the art; various modifications or change for the above embodiments are predictable; this should not be regarded as having exceeded protection scope of the present invention; therefore; protection scope of the present invention is not limited to above-mentioned specifically described embodiment, and should be the most wide in range scope that meets the inventive features that discloses in this place.
Claims (10)
1. network collocating method of testing the Ethernet switch forwarding performance, the port of network test equipment links to each other with the network interface of switch, with user in the network interface analog network of network test equipment, send simultaneously and the acceptance test data message, the reception condition of checkout data, the forwarding performance of judgement switch; The port of tested Ethernet switch links to each other with the port of network tester, it is characterized in that, uses two test ports, has tested several ports of switch, and concrete collocation method is as follows:
A. it is right to connect following port with netting twine: first test port and switch ports themselves first port, and the last port of second test port and switch ports themselves, all the other ports of switch match in twos;
B. the switch ports themselves that will match in twos is configured to several VLANs respectively;
C., the port attribute value of the switch ports themselves of pairing in twos is set respectively, and each is to the port attribute value difference of port;
D. close the generation tree or the rapid spanning-tree function of switch, close the GVRP function.
2. the network collocating method of test Ethernet switch forwarding performance as claimed in claim 1 is characterized in that, the port attribute value that is provided with among the described step c is the PVID value.
3. the network collocating method of test Ethernet switch forwarding performance as claimed in claim 1 is characterized in that, at any one time point, all ports and VLAN are carrying out exchanges data.
4. the network collocating method of test Ethernet switch forwarding performance as claimed in claim 1 is characterized in that, is used to have the switch of 2n port, and wherein n is an integer.
5. the network collocating method of test Ethernet switch forwarding performance as claimed in claim 1 is characterized in that, is used for switch is carried out the pressure test of big data quantity.
6. the network collocating method of test Ethernet switch forwarding performance as claimed in claim 1, it is characterized in that, in the test if message dropping, then adopt dichotomy, choose half test throughput of port tandem queue at every turn, intercept the mid point of tandem queue repeatedly, to find the port of losing message right.
7. a method of testing the Ethernet switch forwarding performance adopts the network as each described method configuration among the claim 1-6, it is characterized in that the handling process of test data is as follows:
A. first data flow enters first port of switch, because first port has the first port attribute value, first data flow is transmitted in first VLAN;
B. the port in first VLAN is connected with port in second VLAN, first data flow enters the port in second VLAN, because the port of second VLAN has the second port attribute value, first data flow is transmitted in second VLAN;
C. similar, first data flow has entered again in his VLAN, finally flows out from last port, enters second port of network testing instrument;
D. same, second port of network tester generates test data second data flow, transmits in several VLANs successively, finally arrives first port of tester.
8. the method for test Ethernet switch forwarding performance as claimed in claim 7 is characterized in that, can reach surface speed forwarding during test.
9. the method for test Ethernet switch forwarding performance as claimed in claim 7 is characterized in that, at any one time point, all ports and VLAN are carrying out exchanges data.
10. the method for test Ethernet switch forwarding performance as claimed in claim 7 is characterized in that, is used to test the switch with 2n port, and wherein n is an integer.
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