CN113746747A - LSP message flow control method and system - Google Patents
LSP message flow control method and system Download PDFInfo
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- CN113746747A CN113746747A CN202111014081.7A CN202111014081A CN113746747A CN 113746747 A CN113746747 A CN 113746747A CN 202111014081 A CN202111014081 A CN 202111014081A CN 113746747 A CN113746747 A CN 113746747A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L47/00—Traffic control in data switching networks
- H04L47/10—Flow control; Congestion control
- H04L47/12—Avoiding congestion; Recovering from congestion
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- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/50—Reducing energy consumption in communication networks in wire-line communication networks, e.g. low power modes or reduced link rate
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Abstract
The invention discloses a method and a system for controlling LSP message flow, which relate to the technical field of routing and comprise the following steps: and informing the equipment state between each intermediate system IS and the direct connection neighbor IS thereof. When the LSP message IS detected to be frequently refreshed, the IS used as the oscillation source notifies the abnormal equipment state and the oscillation suppression time to the direct connection neighbor IS of the oscillation source. And the direct connection neighbor IS of the oscillation source restrains the diffusion of the LSP message in the oscillation restraining time. The LSP message flow control method can reduce invalid LSP message diffusion and NSR synchronization in the network, and save LSP message flooding in the domain and flow generated synchronously.
Description
Technical Field
The invention relates to the technical field of routing, in particular to a method and a system for controlling LSP message flow.
Background
When there is oscillation in the network, the Link State is unstable, or the device NSR (Non-serving Routing) switches, the LSP (Link-State Packet) Packet is frequently changed and refreshed, and is flooded in the domain.
According to the database synchronization mechanism of the protocol, after receiving a new LSP message, the IS-IS (Intermediate System-to-Intermediate System, from Intermediate System to Intermediate System) will periodically notify each neighbor interface, which not only increases bandwidth consumption, but also occupies more CPU resources due to the whole network routing calculation caused by refreshing the LSP message, thereby further aggravating network traffic congestion, which may further cause the IS-IS neighbor and the database to oscillate, forming a vicious circle.
At present, manufacturers limit the route calculation frequency at the control level of each IS-IS device, and the method reduces the CPU consumption of the devices to a certain extent, but cannot effectively reduce meaningless LSP flooding in the network. In addition, if it cannot be guaranteed that the whole network device supports the capability of inhibiting the route calculation, or the route calculation inhibiting algorithms of the devices are inconsistent, a route micro-loop will be caused.
Disclosure of Invention
In view of the defects in the prior art, a first aspect of the present invention is to provide an LSP packet flow control method, which can reduce the diffusion of invalid LSP packets and NSR synchronization in a network, and save LSP packet flooding in an intra-domain and traffic generated synchronously.
In order to achieve the above purposes, the technical scheme adopted by the invention is as follows:
a LSP message flow control method includes the following steps:
informing the equipment state between each intermediate system IS and the direct connection neighbor IS;
when the LSP message IS detected to be frequently refreshed, an IS serving as an oscillation source informs an abnormal state of equipment and oscillation inhibition time to a direct connection neighbor IS of the oscillation source;
and the direct connection neighbor IS of the oscillation source restrains the diffusion of the LSP message in the oscillation restraining time.
In some embodiments of the present invention, the first and second,
and notifying the device state between each intermediate system IS and the direct connection neighbor IS thereof through the extended TLV contained in the HELLO message.
In some embodiments, the method further comprises:
and informing the packet receiving rate of the local port between each intermediate system IS and the direct connection neighbor IS thereof through the extended TLV contained in the HELLO message.
In some embodiments of the present invention, the first and second,
and the IS serving as the oscillation source informs oscillation suppression time to the direct connection neighbor IS of the oscillation source through the extension TLV contained in the LSP message.
In some embodiments, the method further comprises:
when the direct connection neighbor IS of the oscillation source receives the LSP message containing the expansion TLV again in the oscillation suppression time, the diffusion of the LSP message IS suppressed by the new oscillation suppression time, and the LSP message IS flooded when the oscillation suppression time IS detected to be zero.
In some embodiments, the oscillation source is according to the formula:
delay＝(2/p)*arctan(DBsize)*log2(1000+ Ftimes 100), calculating the oscillation suppression time, wherein DBsize represents the IS-IS database size, and Ftimes represents the IS-IS database refreshing time in the preset time.
In some embodiments, the method further comprises:
and monitoring the serial number of the LSP message in the IS-IS database, and judging that the LSP message IS frequently refreshed when the serial number increment IS larger than a set threshold value in preset time.
A second aspect of the present invention is to provide an LSP packet flow control system, which can reduce invalid LSP packet diffusion and NSR synchronization in a network, and save LSP packet flooding in an domain and flow generated synchronously.
In order to achieve the above purposes, the technical scheme adopted by the invention is as follows:
an LSP packet flow control system, comprising:
a plurality of intermediate systems IS configured to:
notifying the equipment state between each intermediate system IS and the direct connection neighbor IS thereof;
when the LSP message IS detected to be frequently refreshed, the IS serving as the oscillation source IS used for announcing the abnormal state of the equipment and the oscillation inhibition time to the direct connection neighbor IS of the oscillation source;
and the direct connection neighbor IS of the oscillation source IS used for inhibiting the LSP message diffusion in the oscillation inhibiting time.
In some embodiments of the present invention, the first and second,
and each intermediate system IS informs the state of the equipment between the intermediate system IS and the direct connection neighbor IS thereof through the extended TLV contained in the HELLO message.
In some embodiments of the present invention, the first and second,
and each intermediate system IS informs the packet receiving rate of a local port between the intermediate system IS and the direct-connected neighbor IS through the extended TLV contained in the HELLO message.
Compared with the prior art, the invention has the advantages that:
in the LSP message flow control method, the oscillation source does not passively send effective and invalid LSP messages to the outside indiscriminately, but notifies oscillation reasons and oscillation suppression time among the devices in a mode of expanding the TLV, so that the local LSP flooding can be restricted by taking LSP message refreshing frequency and opposite end packet receiving capacity as references among the devices, the invalid LSP message diffusion and NSR synchronization in a network are reduced under the condition of link oscillation or NSR switching, and the flows generated by the LSP message flooding and the synchronization in the domain are saved. In addition, the diffusion of invalid LSP IS restrained from the direct connection neighbor of the LSP message refreshing source, so the route calculation requirement of other remote equipment in the IS-IS network IS reduced.
Drawings
Fig. 1 is a flowchart of an LSP packet flow control method in an embodiment of the present invention;
FIG. 2 is a schematic diagram of an application scenario in an embodiment of the present invention;
fig. 3 is a schematic diagram of an extended TLV format in an embodiment of the present invention.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The solution of the embodiment of the invention is mainly as follows: informing the equipment state between each intermediate system IS and the direct connection neighbor IS; when the LSP message IS detected to be frequently refreshed, an IS serving as an oscillation source informs an abnormal equipment state and oscillation inhibition time to a direct connection neighbor IS of the oscillation source; and the direct connection neighbor IS of the oscillation source restrains the diffusion of the LSP message in the oscillation restraining time. Therefore, under the condition of link oscillation or NSR switching, invalid LSP message diffusion and NSR synchronization in the network are reduced, and LSP message flooding in the domain and synchronously generated flow are saved. In addition, the diffusion of invalid LSP messages IS restrained from the direct connection neighbor IS at the LSP message refreshing source, so that the route calculation requirements of other remote equipment in the IS-IS network are reduced.
Referring to fig. 1, fig. 1 is a flowchart illustrating an embodiment of an LSP packet flow control method of the present invention.
In this embodiment, the LSP packet flow control method includes the following steps:
s1, informing the state of the equipment between each intermediate system IS and the direct connection neighbor IS.
At present, no device state IS transmitted between the intermediate systems IS, in this embodiment, the device IS notified between each intermediate system IS and its directly connected neighbor IS, so that other devices can perceive the device state in abnormal oscillation when the link oscillates.
And S2, when the LSP message IS detected to be frequently refreshed, the IS serving as the oscillation source notifies the abnormal equipment state and the oscillation inhibition time to the direct connection neighbor IS of the oscillation source.
It should be noted that the frequent refreshing of the LSP packet may be caused by a shock in the network, an unstable link state, or an NSR switching performed by the device. It IS understood that the oscillation source also refers to an intermediate system IS of the device, which may be a router, for example.
In this embodiment, the serial number of the LSP packet in the IS-IS database IS monitored, and when the serial number increment IS greater than a set threshold within a preset time, it IS determined that the LSP packet IS frequently refreshed. For example, if the sequence number increment is greater than FLUSH _ MAX (set by the command line) in one minute, the LSP packet may be considered to be refreshed frequently.
For LSP messages that are frequently refreshed or are about to be refreshed, because only short link status and temporary prefix information are contained therein, the LSP messages are flooded or NSR synchronized within the network, which does not help with routing convergence, but instead causes waste of bandwidth resources and waste of CPU resources caused by processing these LSP messages. For example, 255 neighbors are established in one IS-IS instance, a single LSP with a length of 1492 bytes issues a configuration or a port oscillates and refreshes the LSP at least once, so that the flow of LSP messages to be flooded IS at least 0.75M, and in the field situation, the device always issues an IS-IS configuration when started, LSP messages need to be refreshed many times, or a port oscillates at millisecond level when a link fails, so that the number of flooded IS-IS messages in the network increases dramatically.
The reason why the flow in the network is increased sharply due to frequent refreshing of LSP messages is that other devices cannot sense the state of the device in abnormal oscillation, so that link oscillation or NSR refresh information is flooded out in the form of LSP. In this embodiment, the oscillation source notifies the oscillation source state and the oscillation suppression time to the direct-connection neighbor of the oscillation source, so that other devices can perceive the device state in abnormal oscillation.
And S3, directly connecting the neighbor IS of the oscillation source to inhibit the diffusion of the LSP message within oscillation inhibition time.
After the oscillation source notifies the abnormal equipment state and the oscillation inhibition time to the direct connection neighbor IS of the oscillation source, the direct connection neighbor IS of the oscillation source can inhibit LSP message diffusion within the oscillation inhibition time.
Further explanation is made below with a specific example:
referring to fig. 2, in fig. 2, Router3 in Area2 is an oscillation source, Router2 in Area1 and Router4 in Area3 are direct neighbors of Router3, and when Router3 notifies Router2 and Router4 of the state of the oscillation source and the oscillation suppression time, Router2 and Router4 will suppress LSP packet diffusion within the oscillation suppression time, that is, will not diffuse into Router1 in Area1 and Router5 in Area 3. It should be noted that the oscillation source states herein include initialization, device switching, overload, and steady state. The state values may be defined by enumeration. For other non-steady states (initialization, equipment switching and overload), the message diffusion can be inhibited.
As a better implementation manner, in some embodiments, the device status IS notified between each intermediate system IS and its directly connected neighbor IS through an extended TLV included in the HELLO packet.
Preferably, in this embodiment, the packet receiving rate of the local port IS notified between each intermediate system IS and its directly connected neighbor IS through an extended TLV included in the HELLO packet.
In a normal state, a receiving device needs to periodically flood and synchronize received LSP messages to neighbors of other ports, if all locally received LSP messages are sent out in each flooding, the bandwidth of the ports is greatly occupied, the LSP messages are limited by CPU resources and exchange chip capacity, the flooding messages may be accumulated in a packet receiving buffer area, and other signaling messages are discarded, so that the current common method is to complete one flooding for multiple times, only about N LSP messages are sent to the neighbors in a time slice, the N value is about 30 by default, although the N value can be adjusted through a command line, an explicit configuration basis is lacked, and only experience can be relied on when the packet receiving processing capacity of a neighbor interface is unclear. Because the packet receiving rate of the local port IS notified between the intermediate system IS and the direct connection neighbor IS, the packet receiving rate can be mapped to the number of LSP messages sent to the port at one time under the condition that the packet receiving rate of each direct connection neighbor IS port IS obtained, so that the diffusion of the LSP messages in the whole network IS more efficient.
In a specific implementation, the oscillation source notifies the abnormal device status through an extended TLV included in the HELLO packet, and notifies the oscillation suppression time through an extended TLV included in the LSP packet.
The TLV refers to a structure composed of a Type of data, a Length of data, and a Value of data, and may be any data Type, and the Value of the TLV may also be a TLV structure.
The extended TLV is a sub-TLV that is a neighbor reachable TLV carried in a HELLO packet or an LSP packet, and the extended content is embodied in a Value portion of the sub-TLV, which is shown in fig. 3 and includes a device state, a port packet receiving rate, a oscillation suppression time, and the like. The device status flag takes two bytes, in fig. 3, N bits (1) indicate that the device is in the NSR stage, and I bits (1) indicate that the port is initialized, it is understood that when N bits and I bits are 0, the device status flag is not in the corresponding state. Port initialization is a non-steady state one, meaning that the port configuration changes and the port or device is still in a negotiated state. The port packet receiving rate represents the maximum packet receiving capacity of the adjacent port. Type 100 refers to the Type of the extended sub-TLV being 100, and R and ellipses indicate that these several bits are reserved for later extension.
The extended TLV may be included in a HELLO packet and an LSP packet of the IS-IS, and if the extended TLV IS used to notify the direct connection neighbor of the device state and the port packet receiving capability of the local device, the extended TLV IS used to notify the oscillation suppression time for suppressing flooding in the LSP packet. Taking fig. 2 as an example, the HELLO message sent by the router3 to the router2 is the device state carrying the router3 and the packet receiving rate of the port directly connected between the router3 and the router2, where the device state includes initialization, device switching, overload, or steady state, and the state value may be defined by enumeration.
It should be noted that, after determining that the LSP packet transitions to the steady state, the oscillation source needs to clear the oscillation suppression time in the LSP packet. Meanwhile, after the oscillation source judges that the device recovers to a steady state, the device abnormal state needs to be cleared in the HELLO, wherein the device abnormal state refers to an unsteady state, namely, the device abnormal state is in an initialization state, a device switching state or an overload state.
And the direct connection neighbor IS of the oscillation source can check the oscillation inhibition time in the LSP message only when the equipment abnormal state in the HELLO message IS checked, and the direct connection neighbor IS of the oscillation source can immediately begin to flood the LSP message according to the original mechanism when the oscillation inhibition time in the LSP message IS cleared.
It can be understood that, the non-steady-state device announces the calculated oscillation suppression time through the corresponding field of the extended TLV in the LSP message, and after receiving the extended TLV, the receiving device starts a timer with the oscillation suppression time, and does not flood the LSP message to other neighbors in the network before the timer expires, and if the timer receives the LSP message issued by the neighbor again before the timer expires and includes the extended TLV, the timer is restarted, and the new oscillation suppression time is counted down, and the flooding and synchronization of the LSP message are continuously suppressed.
As a preferred embodiment, in some embodiments, the oscillation source is according to the formula:
delay＝(2/p)*arctan(DBsize)*log2(1000+ Ftimes 100) calculating the concussion suppression time, wherein DBsize represents the IS-IS database size, Ftimes tableThe number of IS-IS database refreshes within a preset time, for example, may be expressed as the number of IS-IS database refreshes within one minute. For example, if the database scale includes 1000 LSP messages, and the unit time IS taken as the preset time, when the IS-IS database IS refreshed 100 times in the unit time, the oscillation suppression time IS calculated according to the above formula to be about 13.5 seconds.
The algorithm comprehensively considers the scale of the database and the refreshing frequency of the database, the oscillation inhibition time is increased along with the refreshing frequency and the LSP message scale, if the database scale is larger, the oscillation inhibition time is converged to a certain critical value, and the LSP message aging routing loss caused by overlong inhibition time is avoided.
In summary, in the LSP packet flow control method of the present invention, the oscillation source does not passively send valid and invalid LSP packets to the outside indiscriminately, but notifies the oscillation reason and oscillation suppression time between devices in a TLV extension manner, so that local LSP flooding can be constrained between devices with reference to LSP packet refresh frequency and opposite-end packet reception capability, and invalid LSP packet diffusion and NSR synchronization in the network are reduced under link oscillation or NSR switching conditions, thereby saving intra-domain LSP packet flooding and traffic generated synchronously. In addition, the diffusion of invalid LSP IS restrained from the direct connection neighbor of the LSP message refreshing source, so the route calculation requirement of other remote equipment in the IS-IS network IS reduced.
Accordingly, the present invention further provides an LSP packet flow control system, which comprises a plurality of intermediate systems IS, wherein the plurality of intermediate systems IS are configured to:
and informing the equipment state between each intermediate system IS and the direct connection neighbor IS thereof.
When the LSP message IS detected to be frequently refreshed, the IS used as the oscillation source IS used for notifying the equipment abnormal state and oscillation suppression time to the direct connection neighbor IS of the oscillation source.
And the direct connection neighbor IS of the oscillation source IS used for inhibiting the LSP message from diffusing within the oscillation inhibition time.
The reason why the flow in the network is increased sharply due to frequent refreshing of LSP messages is that other devices cannot sense the state of the device in abnormal oscillation, so that link oscillation or NSR refresh information is flooded out in the form of LSP. In this embodiment, since the IS serving as the oscillation source notifies the device abnormal state and the oscillation suppression time to the direct-connection neighbor IS of the oscillation source, other devices can perceive the device state in abnormal oscillation.
Furthermore, each intermediate system IS advertises the device status with its directly connected neighbor IS through the extended TLV included in the HELLO packet.
Furthermore, each intermediate system IS advertises the packet receiving rate of the local port between the extended TLV included in the HELLO packet and its directly connected neighbor IS.
Further, the IS serving as the oscillation source notifies the oscillation suppression time to the direct connection neighbor IS of the oscillation source through the extended TLV included in the LSP packet.
Further, when the direct connection neighbor IS of the oscillation source receives the LSP message containing the expansion TLV again in the oscillation suppression time, the diffusion of the LSP message IS suppressed in the new oscillation suppression time, and the LSP message IS flooded when the oscillation suppression time IS detected to be zero.
It should be noted that the sending device notifies the calculated oscillation suppression time through the corresponding field of the extended TLV in the LSP message, and after receiving the extended TLV, the receiving device starts a timer with the oscillation suppression time, and does not flood the LSP message to other neighbors in the network before the timer expires, and if the timer receives the LSP message issued by the neighbor again before the timer expires and contains the extended TLV, the timer is restarted, and the new oscillation suppression time is counted down to continue suppressing the flooding and synchronization of the LSP message.
Further, the oscillation source is according to the formula:
delay＝(2/p)*arctan(DBsize)*log2(1000+ Ftimes 100), calculating the oscillation suppression time, wherein DBsize represents the IS-IS database size, and Ftimes represents the IS-IS database refreshing time in the preset time.
The algorithm comprehensively considers the scale of the database and the refreshing frequency of the database, the oscillation inhibition time is increased along with the refreshing frequency and the LSP message scale, if the database scale is larger, the oscillation inhibition time is converged to a certain critical value, and the LSP message aging routing loss caused by overlong inhibition time is avoided.
In summary, in the LSP packet flow control system of the present invention, the IS serving as the oscillation source does not passively send valid and invalid LSP packets to the outside indiscriminately, but notifies the oscillation reason and oscillation suppression time between devices in the form of an extended TLV, so that the devices can restrict local LSP flooding with reference to LSP packet refresh frequency and opposite packet reception capability, and reduce the diffusion of invalid LSP packets and NSR synchronization in the network under link oscillation or NSR switching, thereby saving intra-domain LSP packet flooding and the traffic generated synchronously. In addition, the diffusion of invalid LSP IS restrained from the direct connection neighbor of the LSP message refreshing source, so the route calculation requirement of other remote equipment in the IS-IS network IS reduced.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or system that comprises the element.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A LSP message flow control method is characterized in that the method comprises the following steps:
informing the equipment state between each intermediate system IS and the direct connection neighbor IS;
when the LSP message IS detected to be frequently refreshed, an IS serving as an oscillation source informs an abnormal state of equipment and oscillation inhibition time to a direct connection neighbor IS of the oscillation source;
and the direct connection neighbor IS of the oscillation source restrains the diffusion of the LSP message in the oscillation restraining time.
2. The LSP packet traffic control method of claim 1, wherein:
and notifying the device state between each intermediate system IS and the direct connection neighbor IS thereof through the extended TLV contained in the HELLO message.
3. The LSP packet traffic control method of claim 2, wherein the method further comprises:
and informing the packet receiving rate of the local port between each intermediate system IS and the direct connection neighbor IS thereof through the extended TLV contained in the HELLO message.
4. The LSP packet traffic control method of claim 1, wherein:
and the IS serving as the oscillation source informs oscillation suppression time to the direct connection neighbor IS of the oscillation source through the extension TLV contained in the LSP message.
5. The LSP packet flow control method of claim 4, wherein the method further comprises:
when the direct connection neighbor IS of the oscillation source receives the LSP message containing the expansion TLV again in the oscillation suppression time, the diffusion of the LSP message IS suppressed by the new oscillation suppression time, and the LSP message IS flooded when the oscillation suppression time IS detected to be zero.
6. The LSP packet flow control method of claim 1, wherein the oscillation source is according to the formula:
delay＝(2/p)*arctan(DBsize)*log2(1000+ Ftimes 100), calculating the oscillation suppressionAnd (4) time control, wherein DBsize represents the IS-IS database size, and Ftimes represents the IS-IS database refreshing time in the preset time.
7. The LSP packet traffic control method of claim 1, wherein the method further comprises:
and monitoring the serial number of the LSP message in the IS-IS database, and judging that the LSP message IS frequently refreshed when the serial number increment IS larger than a set threshold value in preset time.
8. An LSP packet flow control system, comprising:
a plurality of intermediate systems IS configured to:
notifying the equipment state between each intermediate system IS and the direct connection neighbor IS thereof;
when the LSP message IS detected to be frequently refreshed, the IS serving as the oscillation source IS used for announcing the abnormal state of the equipment and the oscillation inhibition time to the direct connection neighbor IS of the oscillation source;
and the direct connection neighbor IS of the oscillation source IS used for inhibiting the LSP message diffusion in the oscillation inhibiting time.
9. The LSP packet flow control system of claim 7, wherein:
and each intermediate system IS informs the state of the equipment between the intermediate system IS and the direct connection neighbor IS thereof through the extended TLV contained in the HELLO message.
10. The LSP packet flow control system of claim 8, wherein:
and each intermediate system IS informs the packet receiving rate of a local port between the intermediate system IS and the direct-connected neighbor IS through the extended TLV contained in the HELLO message.
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