CN103580845A - Clock synchronization method based on virtual switch cluster and clock synchronization device based on virtual switch cluster - Google Patents
Clock synchronization method based on virtual switch cluster and clock synchronization device based on virtual switch cluster Download PDFInfo
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Abstract
The invention discloses a clock synchronization method based on a virtual switch cluster. The clock synchronization method based on the virtual switch cluster comprises steps that: the virtual switch cluster comprises main physical equipment and at least one secondary physical equipment, the main physical equipment sends synchronization messages through each stack port, the secondary physical equipment receives the synchronization messages from the main physical equipment or other physical equipment and determines a self synchronization stack port, the secondary physical equipment carries out clock synchronization according to the synchronization messages from the synchronization stack ports and generates a new synchronization message, the new synchronization message is sent through a non-synchronization stack port, the synchronization messages comprise MAC header, Ether type, Msg type, flag, shelf and Delay. The invention further discloses a clock synchronization device. Through the technical scheme, clock synchronization of physical equipment in VSC is realized, and system performance can be improved.
Description
Technical field
The present invention relates to data communication field, relate in particular to a kind of clock synchronizing method and device based on virtual switch cluster (Virtual Switch Cluster, VSC).
Background technology
At present, IEEE1588 carries out clock synchronous and has been widely used in data communication field, VSC is as node important in transmission network, the synchronizing characteristicss such as support 1588 are very necessary, this needs VSC in network, to play the part of the key players such as transmission clock (TC), boundary clock (BC), ordinary clock (OC), so realize the synchronous of clock frequency and clock phase in a set of complete mechanism VSC of needs between each physical equipment.
But, realizing at present VSC is generally, by stacking opening, data message in control message and band is carried out to intrasystem forwarding, between physical equipment, do not have unnecessary hardware interface frequency and phase information can be passed to other physical equipments, cause the clock of each physical equipment cannot be synchronous, thereby affect systematic function.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of clock synchronizing method and device based on VSC, can realize the clock synchronous of physical equipment in VSC, improves systematic function.
For achieving the above object, technical scheme of the present invention is achieved in that
A clock synchronizing method based on virtual switch cluster, described virtual switch cluster comprises that a primary physical equipment and at least one are from physical equipment, and primary physical equipment sends sync message by each stacking opening, and the method comprises:
From physical equipment, receive from primary physical equipment or other sync messages from physical equipment, determine the synchronous stacking opening of self;
The described sync message receiving from described synchronous stacking opening from physical equipment basis carries out clock synchronous, and generates new sync message, and described new sync message is sent by asynchronous stacking opening,
Wherein, described sync message comprises: MAC head, EtherType, type of message, sync id flag, device identification shelf and line delay Delay.
Describedly from physical equipment, determine that the synchronous stacking opening of self is:
Describedly from physical equipment, only receive a sync message, determine and receive the synchronous stacking opening that the stacking opening of described sync message is self;
Describedly from physical equipment, receive one or more sync message, according to each sync message, the synchronous stacking opening that stacking opening corresponding to sync message of determining the value minimum of flag+shelf is self.
Described sync message also comprises original time stamp origin Timestamp.
Described after physical equipment receives sync message, the method also comprises:
Describedly from physical equipment, receive and to follow message, described in follow message and carry original time stamp origin Timestamp.
The described sync message receiving from described synchronous stacking opening from physical equipment basis carries out clock synchronous and is:
Described from physical equipment by described synchronous stacking opening, adopt synchronous ether mode to obtain synchronised clock frequency; And calculating phase difference offset=originTimestamp-Delay-T, wherein, T is the described timestamp that receives described sync message from physical equipment, afterwards, the phase difference that adds the above calculating in present clock phase basis, as the clock phase after synchronous.
Describedly from physical equipment, generate new sync message and be:
Sync message based on described reception, by shelf value be revised as the device identification of self, using the value of flag+1 as new flag value and the value of Delay is revised as to the link delay of self.
Describedly from physical equipment, generate new sync message and be:
Sync message based on described reception, by shelf value be revised as the device identification of self, using the value of flag+1 as new flag value, the value of Delay is revised as to the link delay of self and originTimestamp is revised as to the timestamp that sends described sync message.
A clock synchronization apparatus based on virtual switch cluster, comprising: a primary physical equipment and at least one are from physical equipment; Wherein,
Described primary physical equipment, for sending sync message by each stacking opening;
Described from physical equipment, for receiving from primary physical equipment or other sync messages from physical equipment, determine the synchronous stacking opening of self; According to the sync message receiving from described synchronous stacking opening, carry out clock synchronous, and generate new sync message, and described new sync message is sent by asynchronous stacking opening,
Wherein, described sync message comprises: MAC head, EtherType, type of message, sync id flag, device identification shelf and line delay Delay.
Described from physical equipment, specifically for when only receiving a sync message, the synchronous stacking opening that the stacking opening of determining the described sync message of reception is self; When receiving one or more sync message, according to each sync message, the synchronous stacking opening that stacking opening corresponding to sync message of determining the value minimum of flag+shelf is self.
Described sync message also comprises original time stamp origin Timestamp.
Described from physical equipment, also for receiving and follow message after receiving sync message, described in follow message and carry original time and stab origin Timestamp.
Described from physical equipment, specifically for by described synchronous stacking opening, adopt synchronous ether mode to obtain synchronised clock frequency; And calculating phase difference offset=originTimestamp-Delay-T, wherein, T is the described timestamp that receives described sync message from physical equipment, afterwards, the phase difference that adds the above calculating in present clock phase basis, as the clock phase after synchronous.
Described from physical equipment, specifically for the sync message based on described reception, by shelf value be revised as the device identification of self, using the value of flag+1 as new flag value and the value of Delay is revised as to the link delay of self.
Described from physical equipment, specifically for the sync message based on described reception, by shelf value be revised as the device identification of self, using the value of flag+1 as new flag value, the value of Delay is revised as to the link delay of self and origin Timestamp is revised as to the timestamp that sends described sync message.
Clock synchronizing method based on VSC described in the embodiment of the present invention and device, virtual switch cluster comprises a primary physical equipment and at least one is from physical equipment, primary physical equipment sends sync message by each stacking opening, from physical equipment, receive from primary physical equipment or other sync messages from physical equipment, determine the synchronous stacking opening of self; The described sync message receiving from described synchronous stacking opening from physical equipment basis carries out clock synchronous, and generate new sync message, and described new sync message is sent by asynchronous stacking opening, wherein, described sync message comprises: MAC head, EtherType, type of message, sync id (flag), device identification (shelf) and line delay (Delay).By the technical scheme described in the embodiment of the present invention, realized the clock synchronous of physical equipment in VSC, thereby can improve systematic function.
Accompanying drawing explanation
Fig. 1 is a kind of clock synchronizing method schematic flow sheet based on virtual switch cluster of the embodiment of the present invention;
Fig. 2 is the VSC clock synchronous principle schematic of the embodiment of the present invention.
Embodiment
Basic thought of the present invention is: virtual switch cluster comprises a primary physical equipment and at least one is from physical equipment, primary physical equipment sends sync message by each stacking opening, from physical equipment, receive from primary physical equipment or other sync messages from physical equipment, determine the synchronous stacking opening of self; The described sync message receiving from described synchronous stacking opening from physical equipment basis carries out clock synchronous, and generate new sync message, and described new sync message is sent by asynchronous stacking opening, wherein, described sync message comprises: MAC head, EtherType, type of message, sync id (flag), device identification (shelf) and line delay (Delay).
In the present invention, virtual switch cluster comprises a primary physical equipment and at least one is from physical equipment, primary physical equipment sends sync message by each stacking opening, and described sync message generally comprises: MAC head (MACheader), EtherType (Ether type), type of message (Msg type), sync id (flag), device identification (shelf) and line delay (Delay).
Optionally, described sync message also comprises original time stamp origin Timestamp, and corresponding sync message structure is as shown in table 1:
| Octets | Offset | |
| MAC header | 12 | 0 |
| Ether type | 2 | 12 |
| Msg type | 2 | 12 |
| originTimestamp | 10 | 16 |
| Flag | 2 | 26 |
| Shelf | 2 | 28 |
| Delay | 4 | 30 |
Table 1
In table 1, for MAC header, object MAC and source MAC fill in the MAC of this physical equipment; Ether type is generally fixed as 0x0808; It is sync message that Msg type indicates this message; For originTimestamp, general high 48bit is second, and low 32bit is nanosecond; For Flag, primary physical equipment can be 0, every through one-level physical equipment flag increase by 1; Shelf can indicate the shelf id of the physical equipment that sends sync message; The line delay of Delay indication stacking opening, relevant with the light length that stacking opening port connects, according to pre-configured, determine, unit is nanosecond.
Optionally, described after physical equipment receives sync message, the method also comprises: describedly from physical equipment, receive and follow message, described in follow message and carry original time stamp origin Timestamp.
For example, when primary physical equipment sends sync message by stacking opening to other direct-connected physical equipments, the timestamp of transmission can be beaten in sync message the inside by hardware, or the timestamp that reads transmission is put into follows (follow_up) message the inside (the Msg type in follow_up message indicates this message for following message), and the flag in message is arranged to 0xff, fill in the shelf id of oneself in sync message, the link delay (delay) simultaneously corresponding stacking opening being connected is filled up in sync message.
It should be noted that, can determine in the following manner primary physical equipment and from physical equipment:
(1) when VSC is as BC equipment time, 1588 be arranged on which physical equipment when preamble stacking opening, what which physical equipment was corresponding is exactly primary physical equipment.Remaining physical equipment is all from physical equipment;
(2) when VSC is as TC equipment time, synchronous ether be arranged on which physical equipment when preamble stacking opening, what which physical equipment was corresponding is exactly primary physical equipment.Remaining physical equipment is all from physical equipment.
(3) when VSC is as TC equipment time, do not enable synchronous ether, on the control card of VSC, pass through configuring condition and the physical equipment situation in place of shelf, determine primary physical equipment, for example, according to the value competition of shelf, determine that shelf id minimum and physical equipment in place are primary physical equipment, the physical equipment of not competing into primary physical equipment is all from physical equipment, the result of decision can be handed down to each physical equipment afterwards.
Fig. 1 is a kind of clock synchronizing method schematic flow sheet based on virtual switch cluster of the embodiment of the present invention, and as shown in Figure 1, the method comprises:
Step 101: receive from primary physical equipment or other sync messages from physical equipment from physical equipment, determine the synchronous stacking opening of self;
Optionally, describedly from physical equipment, determine that the synchronous stacking opening of self is: describedly from physical equipment, only receive a sync message, determine and receive the synchronous stacking opening that the stacking opening of described sync message is self; Describedly from physical equipment, receive one or more sync message, according to each sync message, the synchronous stacking opening that stacking opening corresponding to sync message of determining the value minimum of flag+shelf is self.
Step 102: the described sync message receiving from described synchronous stacking opening from physical equipment basis carries out clock synchronous, and generates new sync message, and described new sync message is sent by asynchronous stacking opening.
Optionally, describedly from physical equipment, according to the sync message receiving from described synchronous stacking opening, carry out clock synchronous and be: described from physical equipment by described synchronous stacking opening, adopt synchronous ether mode to obtain synchronised clock frequency; And calculating phase difference offset=originTimestamp-Delay-T, wherein, T is the described timestamp that receives described sync message from physical equipment, afterwards, the phase difference that adds the above calculating in present clock phase basis, as the clock phase after synchronous.
Optionally, the scene that does not comprise original time stamp origin Timestamp for sync message, describedly from physical equipment, generate new sync message and be: the sync message based on described reception, by shelf value be revised as the device identification of self, using the value of flag+1 as new flag value and the value of Delay is revised as to the link delay of self.
Optionally, the scene that also comprises original time stamp origin Timestamp for sync message, describedly from physical equipment, generate new sync message and be: the sync message based on described reception, by shelf value be revised as the device identification of self, using the value of flag+1 as new flag value, the value of Delay is revised as to the link delay of self and origin Timestamp is revised as to the timestamp that sends described sync message.
Concrete, after receiving from physical equipment the sync message that primary physical equipment sends over, determine own synchronous stacking opening, by synchronous ether recovery frequency.At physical layer or MAC layer, while receiving sync message, beat stamp T; Afterwards, by the sync message of reception and time stamp T, give software module, by software module, calculate phase difference offset=originTimestamp-Delay-T, the row clock phase place of going forward side by side adjustment.Simultaneously, the stacking opening of thinking by synchronous stacking opening sends new sync message, specifically the timestamp of transmission is beaten in described new sync message the inside by hardware, or the timestamp that reads transmission is put into follow_up message the inside, Shelf fills in the Shelf id of oneself, Flag adds 1 on the basis of the message of the slave stacking opening of receiving, the link delay delay that simultaneously correspondence is sent to stacking opening connection is filled up in described new sync message.Other be not directly connected with primary physical equipment from physical equipment, may receive a plurality of sync messages from physical equipment, compare, take and receive the synchronous stacking opening that in sync message, that minimum stacking opening of flag+shelf value is this physical equipment, subsequent treatment is identical from physical equipment with above-mentioned direct connection primary physical equipment.It should be noted that, whether whether direct-connected with primary physical equipment can be 0 to judge by the flag in message.Take and adopt 1588 agreements as example, the VSC clock synchronous principle that the embodiment of the present invention relates to as shown in Figure 2.
The embodiment of the present invention also correspondingly discloses a kind of clock synchronization apparatus based on virtual switch cluster, and this device comprises: a primary physical equipment and at least one are from physical equipment; Wherein,
Described primary physical equipment, for sending sync message by each stacking opening;
Described from physical equipment, for receiving from primary physical equipment or other sync messages from physical equipment, determine the synchronous stacking opening of self; According to the sync message receiving from described synchronous stacking opening, carry out clock synchronous, and generate new sync message, and described new sync message is sent by asynchronous stacking opening,
Wherein, described sync message comprises: MAC head, EtherType, type of message, sync id flag, device identification shelf and line delay Delay.
Optionally, described from physical equipment, specifically for when only receiving a sync message, the synchronous stacking opening that the stacking opening of determining the described sync message of reception is self; When receiving one or more sync message, according to each sync message, the synchronous stacking opening that stacking opening corresponding to sync message of determining the value minimum of flag+shelf is self.
Optionally, described sync message also comprises original time stamp origin Timestamp.
Optionally, described from physical equipment, also for receiving and follow message after receiving sync message, described in follow message and carry original time and stab origin Timestamp.
Optionally, described from physical equipment, specifically for by described synchronous stacking opening, adopt synchronous ether mode to obtain synchronised clock frequency; And calculating phase difference offset=originTimestamp-Delay-T, wherein, T is the described timestamp that receives described sync message from physical equipment, afterwards, the phase difference that adds the above calculating in present clock phase basis, as the clock phase after synchronous.
Optionally, described from physical equipment, specifically for the sync message based on described reception, by shelf value be revised as the device identification of self, using the value of flag+1 as new flag value and the value of Delay is revised as to the link delay of self.
Optionally, described from physical equipment, specifically for the sync message based on described reception, by shelf value be revised as the device identification of self, using the value of flag+1 as new flag value, the value of Delay is revised as to the link delay of self and origin Timestamp is revised as to the timestamp that sends described sync message.
Can find out, in order to solve the problem of clock synchronous between the physical equipment of VSC, the present invention is not needing to increase under the prerequisite of hardware interface, for the VSC equipment that comprises 2 and 2 above physical equipments, realized the synchronous of frequency and phase place, and, sync message terminates in stacking opening, in VSC, do not flood, be not limited to the star-like connection of VSC equipment or connected in series simultaneously, the support that favourable VSC equipment requires clock network.It should be noted that, the present invention is equally applicable to the technology such as IRF (Intelligent Resilient Framework), VSS (Virtual Switch System), CSS (Cluster Switch System), VC (Virtual Chassis).
The above, be only preferred embodiment of the present invention, is not intended to limit protection scope of the present invention.
Claims (14)
1. the clock synchronizing method based on virtual switch cluster, is characterized in that, described virtual switch cluster comprises that a primary physical equipment and at least one are from physical equipment, and primary physical equipment sends sync message by each stacking opening, and the method comprises:
From physical equipment, receive from primary physical equipment or other sync messages from physical equipment, determine the synchronous stacking opening of self;
The described sync message receiving from described synchronous stacking opening from physical equipment basis carries out clock synchronous, and generates new sync message, and described new sync message is sent by asynchronous stacking opening,
Wherein, described sync message comprises: MAC head, EtherType, type of message, sync id flag, device identification shelf and line delay Delay.
2. method according to claim 1, is characterized in that, describedly from physical equipment, determines that the synchronous stacking opening of self is:
Describedly from physical equipment, only receive a sync message, determine and receive the synchronous stacking opening that the stacking opening of described sync message is self;
Describedly from physical equipment, receive one or more sync message, according to each sync message, the synchronous stacking opening that stacking opening corresponding to sync message of determining the value minimum of flag+shelf is self.
3. method according to claim 1, is characterized in that, described sync message also comprises original time stamp origin Timestamp.
4. method according to claim 1, is characterized in that, described after physical equipment receives sync message, the method also comprises:
Describedly from physical equipment, receive and to follow message, described in follow message and carry original time stamp origin Timestamp.
5. according to the method described in claim 3 or 4, it is characterized in that, the described sync message receiving from described synchronous stacking opening from physical equipment basis carries out clock synchronous and is:
Described from physical equipment by described synchronous stacking opening, adopt synchronous ether mode to obtain synchronised clock frequency; And calculating phase difference offset=originTimestamp-Delay-T, wherein, T is the described timestamp that receives described sync message from physical equipment, afterwards, the phase difference that adds the above calculating in present clock phase basis, as the clock phase after synchronous.
6. according to the method described in claims 1 to 3 any one, it is characterized in that, describedly from physical equipment, generate new sync message and be:
Sync message based on described reception, by shelf value be revised as the device identification of self, using the value of flag+1 as new flag value and the value of Delay is revised as to the link delay of self.
7. method according to claim 4, is characterized in that, describedly from physical equipment, generates new sync message and is:
Sync message based on described reception, by shelf value be revised as the device identification of self, using the value of flag+1 as new flag value, the value of Delay is revised as to the link delay of self and origin Timestamp is revised as to the timestamp that sends described sync message.
8. the clock synchronization apparatus based on virtual switch cluster, is characterized in that, this device comprises: a primary physical equipment and at least one are from physical equipment; Wherein,
Described primary physical equipment, for sending sync message by each stacking opening;
Described from physical equipment, for receiving from primary physical equipment or other sync messages from physical equipment, determine the synchronous stacking opening of self; According to the sync message receiving from described synchronous stacking opening, carry out clock synchronous, and generate new sync message, and described new sync message is sent by asynchronous stacking opening,
Wherein, described sync message comprises: MAC head, EtherType, type of message, sync id flag, device identification shelf and line delay Delay.
9. device according to claim 8, is characterized in that,
Described from physical equipment, specifically for when only receiving a sync message, the synchronous stacking opening that the stacking opening of determining the described sync message of reception is self; When receiving one or more sync message, according to each sync message, the synchronous stacking opening that stacking opening corresponding to sync message of determining the value minimum of flag+shelf is self.
10. device according to claim 8, is characterized in that, described sync message also comprises original time stamp origin Timestamp.
11. devices according to claim 8, is characterized in that,
Described from physical equipment, also for receiving and follow message after receiving sync message, described in follow message and carry original time and stab origin Timestamp.
12. according to the device described in claim 10 or 11, it is characterized in that,
Described from physical equipment, specifically for by described synchronous stacking opening, adopt synchronous ether mode to obtain synchronised clock frequency; And calculating phase difference offset=originTimestamp-Delay-T, wherein, T is the described timestamp that receives described sync message from physical equipment, afterwards, the phase difference that adds the above calculating in present clock phase basis, as the clock phase after synchronous.
Device described in 13. according to Claim 8 to 10 any one, is characterized in that,
Described from physical equipment, specifically for the sync message based on described reception, by shelf value be revised as the device identification of self, using the value of flag+1 as new flag value and the value of Delay is revised as to the link delay of self.
14. devices according to claim 11, is characterized in that,
Described from physical equipment, specifically for the sync message based on described reception, by shelf value be revised as the device identification of self, using the value of flag+1 as new flag value, the value of Delay is revised as to the link delay of self and origin Timestamp is revised as to the timestamp that sends described sync message.
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| CN104580183A (en) * | 2014-12-27 | 2015-04-29 | 北京奇虎科技有限公司 | Cross-cluster data synchronization method and device |
| CN105897366A (en) * | 2016-04-01 | 2016-08-24 | 浪潮电子信息产业股份有限公司 | Method and system for ensuring time consistency of computer cluster nodes |
| CN106712885A (en) * | 2016-12-14 | 2017-05-24 | 北京华为数字技术有限公司 | Clock synchronization method, network device and network system |
| CN108234321A (en) * | 2016-12-14 | 2018-06-29 | 中兴通讯股份有限公司 | A kind of method and system of message forwarding |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104580183A (en) * | 2014-12-27 | 2015-04-29 | 北京奇虎科技有限公司 | Cross-cluster data synchronization method and device |
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| CN106712885A (en) * | 2016-12-14 | 2017-05-24 | 北京华为数字技术有限公司 | Clock synchronization method, network device and network system |
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| CN106712885B (en) * | 2016-12-14 | 2018-12-14 | 北京华为数字技术有限公司 | Clock synchronizing method, the network equipment and network system |
| CN108234321B (en) * | 2016-12-14 | 2021-02-23 | 中兴通讯股份有限公司 | Method and system for forwarding message |
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