CN111478778B - Method for reducing RSTP looped network power consumption and application thereof - Google Patents
Method for reducing RSTP looped network power consumption and application thereof Download PDFInfo
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Abstract
The invention discloses a method for reducing RSTP ring network power consumption and application thereof, in a network system formed by network equipment (such as a switch) which supports all RSTP protocols and meets the IEEE 802.3az EEE standard, only transmitting BPDU messages specified by the RSTP protocols on blocked redundant links, setting the specified port state as a Discarding blocking state and not transmitting the network messages which are discarded because the MAC of a receiving party is the Discarding blocking state. By the method, the utilization rate of the redundant link is greatly reduced, and the PHYs of two ends of the redundant link meeting the IEEE 802.3az EEE standard are in a sleep state in most of time, so that the power consumption of the network is reduced.
Description
Technical Field
The invention relates to the technical field of communication, in particular to a method for reducing power consumption of an RSTP ring network and application thereof.
Background
With the continuous expansion of the ethernet scale, the number of switching devices in the network is continuously increased, the network communication rate is continuously increased, and the power consumption of the devices is also rapidly increased. How to reduce the power consumption of the ethernet becomes a hot point of research in the field of digital communications. In some specific networking environments, such as battery-powered or airborne networking environments, the significance of reducing the power consumption of the ethernet is far more than that of saving energy, and lower heat dissipation requirements, lighter equipment weight and the like can be realized. Experiments have shown that the link power consumption of the ethernet PHY is about 0.5W for 1Gbps and about 5W for 10G. In order to keep the sending party and the receiving party synchronized when no data is transmitted, the power consumption of the conventional Ethernet is fixed regardless of whether data is transmitted or not. To reduce the power consumption of Ethernet, the IEEE 802.3az EEE (Energy Efficient Ethernet) power-saving Ethernet standard has been widely used in the industry. The principle of the energy-saving ethernet EEE is to let the PHY sleep automatically when there is no data transfer, thus saving energy.
In some networking environments, redundant link protection is required to improve the fault tolerance of the network to link faults, and the ring networking mode is the most common method for realizing the networking mode. However, ethernet switches require that no loop can be found in the network, otherwise, a network storm occurs to cause the whole network to be interrupted and unavailable, so that a method for dynamically detecting and removing loops in the network occurs, and the most widely used protocol is the RSTP protocol of IEEE 802.1D 2004.
The RSTP protocol breaks network loops by blocking redundant physical links. When the main link fails, the main link is automatically switched to a certain blocked redundant link. The state of a blocked link can be decomposed into the following sub-states (taking as an example that two ends of the link point-to-point connection are an alternative port and a designated port, respectively): the PHYs at the two ends are all in the Link up state, the MAC layer of the designated port is in the Forwarding state, the MAC layer of the substitute port is in the Discarding blocking state, and it can be seen that 2 PHYs of the blocked Link are all in the working state. PHYs that meet the energy efficient ethernet EEE standard will operate in sleep state for most of the time if there is no or little traffic on the blocked Link, and therefore their power consumption is low even if 2 PHYs of the blocked Link are in Link up state. This is not the case and both PHYs cannot go to sleep even most of the time. The analysis was as follows: according to the RSTP protocol specification, ports at two ends of a blocking link can mutually send BPDU messages at hello time intervals (default to 2 seconds), if only the BPDU messages are interacted on the link, the link is in an absolute idle state, most of time of a PHY is in sleep, and power consumption is extremely low. But the blocked link is also forwarding the following type of message 1. no unicast message required to be flooded from each port is recorded in the forwarding table of the current switch; 2. broadcast messages or partial multicast messages in the network. And as users become more and network traffic becomes larger, the number of these types of messages will grow. These messages will be transmitted and eventually die in the following order: port-specific MAC- > port-specific PHY- > alternate port MAC drop, so 2 PHYs of the blocked link will be frequently woken up for useless data transceiving and therefore not sleep. When a ring network is constructed by using standard RSTP, the process of transmitting and receiving data by using network topology and a blocked link is shown in fig. 1.
Disclosure of Invention
In order to solve the technical problem that when the existing standard RSTP protocol builds a ring network, the PHY of a blocked link can be frequently awakened to perform useless data receiving and sending, so that the sleep cannot be performed, and the energy consumption cannot be reduced, the invention provides the method for reducing the power consumption of the RSTP ring network.
The invention is realized by the following technical scheme:
a method for reducing RSTP ring network power consumption is applied to a network system formed by network devices which all support RSTP protocol and meet IEEE 802.3az EEE standard; specifically, when a blocked redundant link only forwards a BPDU message specified by an RSTP protocol, the method sets the state of a designated port to a Discarding blocking state and does not forward a network message discarded because the MAC of a receiving party is the Discarding blocking state so as to enable the PHY of the blocked redundant link to be in a sleep state, and further reduce the power consumption of network use.
The invention greatly reduces the utilization rate of the redundant link by the method, and the PHY of which both ends meet the IEEE 802.3az EEE standard is in a sleep state in most of time, thereby reducing the power consumption of network use.
Further, when the redundant link needs to be switched to the active state, the designated port in the Discarding blocking state can be automatically switched to the Forwarding state. So that the modified RSTP protocol and the original standard RSTP protocol keep good compatibility.
Further, when the blocked redundant link only forwards the BPDU message specified by the RSTP protocol, the setting of the designated port state to the Discarding blocking state does not forward the network message discarded because the MAC of the receiving party is the Discarding blocking state specifically includes:
step S1, opening a recording space for each port in the network;
step S2, each port records the BPDU message sent by the adjacent bridge of the opposite end at the latest time, and extracts the port role field of the transmitting port in the BPDU message;
step S3, adding the following condition judgment in the Port State Transition State machine:
step S3.1, if the current port state is Forwarding, executing step S3.2, otherwise, handing over to the original RSTP protocol logic processing;
step S3.2, if the current port role is the designated port and the role field extracted in step S2 is the alternative port or the backup port, setting the current port state as the Discarding blocking state, and setting the forwarding flag in the RSTP protocol state machine as TRUE; otherwise, the protocol is processed by the original RSTP protocol logic.
Further, in step S2, the present invention further extracts the port ID and the role of the transmitting port in the BPDU message.
On the other hand, the invention also provides a network system, which is composed of all network devices which support the RSTP protocol and meet the IEEE 802.3az EEE standard, wherein the network devices all support the method for reducing the power consumption of the RSTP ring network.
Compared with the prior art, the invention has the following advantages and beneficial effects:
in a network system formed by network equipment (such as a switch) which supports all RSTP protocols and meets the IEEE 802.3az EEE standard, the method for reducing the power consumption of the RSTP ring network only forwards BPDU messages specified by the RSTP protocols on blocked redundant links, sets the state of a designated port to be a Discarding blocking state and does not forward network messages which are discarded because the MAC of a receiving party is the Discarding blocking state. By the method, the utilization rate of the redundant link is greatly reduced, and the PHYs of two ends of the redundant link meeting the IEEE 802.3az EEE standard are in a sleep state in most of time, so that the power consumption of the network is reduced. Meanwhile, when the redundant link needs to be switched to the active state, the designated port in the Discarding state can be automatically switched to the forwarding state, and the original link switching result and performance of the RSTP protocol are not affected.
The method for reducing the power consumption of the RSTP ring network increases detection and processing logic in the standard RSTP protocol, but the modified RSTP protocol is compatible with the original standard RSTP protocol. Can be well mixed with various devices running standard RSTP protocol to form a network.
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The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
FIG. 1 is a block diagram of a standard RSTP protocol for transmitting and receiving data in a link according to the present invention.
Fig. 2 is a schematic diagram of the principle of reducing the power consumption of the RSTP ring network according to the present invention.
Fig. 3 is a schematic flow chart of a method for reducing power consumption of an RSTP ring network according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
Example 1
The embodiment provides a method for reducing the power consumption of an RSTP ring network.
The method provided by the embodiment adds detection and processing logic to the original standard RSTP protocol, and the modified RSTP protocol is compatible with the original standard RSTP protocol, so that the method can well perform hybrid networking with various devices running the standard RSTP protocol. The working principle is as follows: in a network system composed of network devices which all support RSTP protocol and meet IEEE 802.3az EEE standard, only the BPDU message specified by the RSTP protocol is forwarded on the blocked redundant link, and the designated port state is set to the Discarding blocking state, so that the network message which is finally discarded because the MAC of the receiving party is the Discarding blocking state is not forwarded. By the method, the utilization rate of the redundant link is greatly reduced, and the PHYs of two ends of the redundant link meeting the IEEE 802.3az EEE standard are in a sleep state in most of time, so that the power consumption of the network is reduced. Meanwhile, when the redundant link needs to be switched to the active state, the designated port in the Discarding state can be automatically switched to the forwarding state, and the original link switching result and performance of the RSTP protocol are not affected.
Specifically, in this embodiment, as shown in fig. 2, in a network system formed by an a switch, a B switch, and a C switch, where the switch bridge priority is a > B > C, DP is a designated port, AP is a substitute port, and RP is a root port; after the standard RSTP protocol is operated, A is a root bridge, and a link formed by B and C is blocked. At this time, the DP port of the switch B is set to the Discarding blocking state, the packet sent by the switch B is discarded here, and the PHYs of B and C will sleep for most of the time; if the link between B and C is gigabit Ethernet, the power consumption of about 0.5W can be saved by about 1W according to the power consumption of one PHY. Meanwhile, when the physical connection between the A and the C is unplugged, the redundant link is switched to a main state, and when the AP port in front of the C switch is switched to the RP port, the DP port of the B switch is switched to a Forwarding switching state, so that the switching result and the performance of a standard RSTP protocol are not influenced.
As shown in fig. 3, the method proposed by this embodiment is implemented as follows:
step S1, opening a recording space for each port in the network;
step S2, each port records the BPDU packet sent by the adjacent bridge of the opposite end at the latest time, and extracts the port role field (content 1 shown in fig. 3) of the transmitting port in the BPDU packet; meanwhile, the port ID in the BPDU message is also extracted.
Step S3, adding the following condition judgment in the Port State Transition State machine:
step S3.1, if the current port state is Forwarding, executing step S3.2, otherwise (for example, the current port state is Learning or Discarding, etc.), handing over to the original RSTP protocol logic processing;
step S3.2, if the current port role is the designated port and the role field (content 1 shown in fig. 3) extracted in step S2 is an alternative port or a backup port, setting the current port state to the Discarding blocking state, and setting the forwarding flag in the RSTP protocol state machine to TRUE; otherwise, the protocol is processed by the original RSTP protocol logic.
The method for reducing the power consumption of the RSTP ring network can be well applied to a network system formed by network equipment which supports all RSTP protocols and meets the IEEE 802.3az EEE standard.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (3)
1. A method for reducing RSTP ring network power consumption is characterized in that the method is applied to a network system formed by network equipment which supports all RSTP protocols and meets the IEEE 802.3az EEE standard; the method specifically sets the state of a designated port to be a Discarding blocking state when a blocked redundant link only forwards a BPDU message specified by an RSTP protocol, and does not forward a network message discarded because a receiving party MAC is the Discarding blocking state so as to enable a PHY (physical layer) of the blocked redundant link to be in a sleep state, thereby reducing the power consumption of the network;
when the blocked redundant link only forwards the BPDU message specified by the RSTP protocol, the designated port state is set to the Discarding blocking state, and not forwarding the network message discarded because the MAC of the receiving party is the Discarding blocking state specifically includes:
step S1, opening a recording space for each port in the network;
step S2, each port records the BPDU message sent by the adjacent bridge of the opposite end at the latest time, and extracts the port role field of the transmitting port in the BPDU message; in the step S2, the port ID and the role of the transmitting port in the BPDU message are also extracted;
step S3, adding the following condition judgment in the Port State Transition State machine:
step S3.1, if the current port state is Forwarding, executing step S3.2, otherwise, handing over to the original RSTP protocol logic processing;
step S3.2, if the current port role is the designated port and the role field extracted in step S2 is the alternative port or the backup port, setting the current port state as the Discarding blocking state, and setting the forwarding flag in the RSTP protocol state machine as TRUE; otherwise, the protocol is processed by the original RSTP protocol logic.
2. The method of claim 1, wherein when the redundant link needs to be switched to the active state, the designated port in the Discarding blocking state can be automatically switched to the Forwarding state.
3. A network system, characterized in that the network system is composed of network devices which all support RSTP protocol and meet IEEE 802.3az EEE standard, wherein the network devices all support the method for reducing RSTP ring network power consumption of any one of the above claims 1-2.
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