CN103873294A - Keep-alive method and device for PPP (Point-to-Point Protocol) link during ISSU (In Service Software Upgrade) process - Google Patents
Keep-alive method and device for PPP (Point-to-Point Protocol) link during ISSU (In Service Software Upgrade) process Download PDFInfo
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- CN103873294A CN103873294A CN201410079233.5A CN201410079233A CN103873294A CN 103873294 A CN103873294 A CN 103873294A CN 201410079233 A CN201410079233 A CN 201410079233A CN 103873294 A CN103873294 A CN 103873294A
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Abstract
The invention provides a keep-alive method for a PPP (Point-to-Point Protocol) link during an ISSU (In Service Software Upgrade) process, which is applied to network equipment. The keep-alive method comprises the following steps: sending a configuration request message carrying Keep alive time to opposite terminal equipment in PPP link with the network equipment when the ISSU is required by the network equipment; utilizing the configuration request message to trigger the opposite terminal equipment to set the Keep alive time according to the received configuration request message, and sending a response message to the network equipment after finishing the setting; receiving the response message sent by the opposite terminal equipment and starting the ISSU after receiving the response message. According to the keep-alive method provided by the invention, the negotiation for the Keep alive time is realized through PPP interaction. During the ISSU process, the PPP link between ISSU equipment and the opposite terminal equipment is prevented from being down.
Description
Technical field
The present invention relates to communication technique field, relate in particular to method and the corresponding equipment thereof of ppp link keep-alive in a kind of ISSU escalation process.
Background technology
The network equipment is carrying out ISSU(In-Service Software Upgrade, non-interrupting service upgrading) when upgrading, need in escalation process, restart the CPU of cable card board, therefore do not interrupt for guarantee agreement message, the protocol massages of upper line sending clamp CPU need to be delivered to the Ethernet switching chip of out-band channel by the ethernet port of forwarding chip, and then on deliver on master control borad, further deliver in agency by agreement and process by master control borad.
PPP(Point-to-Point Protocol between the network equipment, point-to-point protocol) after link establishment, by regular transmission LCP(Link Control Protocol, LCP) Echo Request and Echo Reply message carry out Link State maintenance, if the Echo Request message sending can not get the Echo Reply back message using of opposite equip., set up successful ppp link and will fall by down.
For ppp protocol message, all process by delivering to cable card board CPU on local bus, and forwarding chip between cable card board is often only supported Ethernet interface, cannot forward the ppp protocol message of WAN mouth, therefore in ISSU escalation process, ppp protocol message cannot be by delivering on master control borad in the Ethernet switching chip of out-band channel, thereby cause the network equipment in the time that ISSU upgrades, to be restarted after the CPU of cable card board, cannot respond the Echo Request message from opposite equip., thereby cause the ppp link of having set up between the network equipment to disconnect.
Summary of the invention
In view of this, the present invention proposes the method for ppp link keep-alive in a kind of ISSU escalation process, is applied on the network equipment, and described method comprises:
In the time that the described network equipment need to carry out ISSU upgrading, send the configuring request message that carries keep-alive time Keep alive time to the opposite equip. being connected with the built vertical PPP of this equipment; Wherein this configuring request message arranges described Keep alive time for triggering opposite equip. according to the configuring request message of receiving, and sends back message using to the described network equipment after setting completes;
Receive the back message using that described opposite equip. sends, and receiving after described back message using, start ISSU upgrading.
Preferably, described method also comprises: after ISSU upgrading finishes, message is denied in the configuration of carrying described Keep alive time to described opposite equip. transmission; Wherein this configuration denies that message denies that according to the configuration of receiving message removes the described Keep alive time having arranged for triggering opposite equip., and recovers Configuration Values or the default value of self Keep alive time.
Preferably, described configuring request message is LCP configuring request LCP Configure-request message; Described back message using is that Configure-ACK message is responded in LCP configuration; Described configuration denies that message is that Configure-NAK message is denied in LCP configuration.
Preferably, described Keep alive time is 0; Wherein, in the time that described Keep alive time is 0, represent that described Keep alive time is endless.
The present invention also proposes the device of ppp link keep-alive in a kind of ISSU escalation process, is applied on the network equipment, and described device comprises:
Transmitting element, for carrying out when this equipment ISSU when upgrading, carries the configuring request message of keep-alive time Keep alive time to the opposite equip. transmission being connected with the built vertical PPP of this equipment; Wherein this configuring request message arranges described Keep alive time for triggering opposite equip. according to the configuring request message of receiving, and sends back message using to the described network equipment after setting completes;
Receiving element, the back message using sending for receiving described opposite equip., and receiving after described back message using, start ISSU upgrading.
Preferably, described transmitting element is further used for: after ISSU upgrading finishes, message is denied in the configuration of carrying described Keep alive time to described opposite equip. transmission; Wherein this configuration denies that message denies that according to the configuration of receiving message removes the described Keep alive time having arranged for triggering opposite equip., and recovers Configuration Values or the default value of self Keep alive time.
Preferably, described configuring request message is LCP configuring request LCP Configure-request message; Described back message using is that Configure-ACK message is responded in LCP configuration; Described configuration denies that message is that Configure-NAK message is denied in LCP configuration.
Preferably, described Keep alive time is 0; Wherein, in the time that described Keep alive time is 0, represent that described Keep alive time is endless.
The present invention is realized alternately the ppp link Keep alive time time on opposite equip. is configured to endless by ppp protocol, in ISSU process, ensures that the ppp link between ISSU equipment and opposite equip. can not fallen by down.
Brief description of the drawings
Fig. 1 is ppp protocol message forwarding path in prior art;
Fig. 2 is the flow chart of the method for ppp link keep-alive in a kind of ISSU escalation process of the present invention;
Fig. 3 is LCP message encapsulation format in one embodiment of the present invention;
Fig. 4 is LCP message config option encapsulation format in one embodiment of the present invention;
Fig. 5 is the building-block of logic of ppp link keep-alive device in a kind of ISSU escalation process of the present invention.
Embodiment
In actual application, the keep-alive of ppp link realizes by keep-alive time Keep alive time is set.So-called Keep alive time refers to that periodic transmission LCP message consults the interval time of ppp link.After the ppp link between two equipment has been set up, can carry out maintenance link state according to the transmission Echo Request of Keep alive time time cycle property and Echo Reply message, if the Echo Request message sending can not get the Echo Reply back message using of opposite equip., will fall by down with the ppp link that opposite equip. has been set up.
Refer to Fig. 1, the ppp protocol message of WAN mouth, by after POS (Packet Over SONET/SDH) framing chip encapsulation framing, by FPGA(Field Programmable Gate Array, field programmable gate array) on local bus, deliver to that cable card board CPU processes.And forwarding chip between cable card board is often only supported Ethernet interface, cannot forward the ppp protocol message of WAN mouth, therefore ppp protocol message cannot be by delivering to master control borad in the Ethernet switching chip of out-band channel, when local device is restarted after the CPU of cable card board in the time that ISSU upgrades, cannot respond the EchoRequest message from opposite equip., thereby can cause the ppp link down having set up between local device and opposite equip. to fall.
In order to ensure in ISSU escalation process, there is not the situation that down falls in the ppp link that local device and opposite equip. have been set up, common way is that the Keep alive time of opposite equip. is set to 0, after ISSU upgrading finishes, then the Keep alive time of opposite equip. setting is returned to original configuration.Wherein, if Keep alive time is set to 0, represent that Keep alive time is endless, opposite equip. just no longer sends Echo Request message.Due to only in the time that the Echo Request message sending can not get responding, the ppp link of having set up just can be fallen by down, therefore, the Keep alive time of opposite equip. is set to 0, can ensure that local device is carrying out ISSU when upgrading, the ppp link of having set up with opposite equip. not down is fallen.
But above scheme configures too loaded down with trivial details in practice, and easily omit.Such as, have 100 opposite equip.s if need to carry out the network equipment of ISSU upgrading, need to be on 100 opposite equip.s respectively Keep alive time be set to 0.
For the problems referred to above; the present invention proposes the method for ppp link keep-alive in a kind of ISSU escalation process; realize alternately the ppp link Keep alive time time on opposite equip. is configured to endless by ppp protocol, thereby the ppp link that guarantee local device has been set up in the time carrying out ISSU upgrading and between opposite equip. can not fallen by down.
For making object of the present invention, technical scheme and advantage clearer, referring to the accompanying drawing embodiment that develops simultaneously, scheme of the present invention is described in further detail.
Referring to Fig. 2, the exemplary one of the present invention preferred embodiment in, the present invention proposes the method for ppp link keep-alive in a kind of ISSU escalation process, is applied on the network equipment, the method is carried out following steps:
Step S201, when the described network equipment need to carry out ISSU when upgrading, carry the configuring request message of keep-alive time Keep alive time to the opposite equip. transmission being connected with the built vertical PPP of this equipment; Wherein this configuring request message arranges described Keep alive time for triggering opposite equip. according to the configuring request message of receiving, and sends back message using to the described network equipment after setting completes;
Step S202, receive the back message using that described opposite equip. sends, and receiving after described back message using, start ISSU upgrading.
In the present embodiment, described configuring request message is LCP Configure-request message; Described back message using is LCP Configure-ACK message; Described configuration denies that message is LCP Configure-NAK message.
Refer to Fig. 3, for LCP message, exchanged in ppp link establishment phase, it is encapsulated in as the net load of PPP in the information field of PPP information frame, now the fixing 0xC021 that fills of the protocol domain of PPP information frame.Function according to message can be divided three classes LCP message, is respectively link configuration message, and link stops message and link maintenance message.In the present embodiment, utilize the link configuration message of LCP to carry out Keep alive time negotiation.Link configuration message mainly comprises Config-Request, Config-Ack, Config-Nak and tetra-kinds of messages of Config-Reject.Please refer to Fig. 4, the config option that agreement specifies at present comprises:
Type Configuration Option
1 Maximum-Receive-Unit
2 Async-Control-Character-Map
3 Authentication-Protocol
4 Quality-Protocol
5 Magic-Number
6 RESERVED
7 Protocol-Field-Compression
8 Address-and-Control-Field-Compression
For the communicating pair of ppp link, while being configured the negotiation of parameter by interactive link configuration message, no matter which side can be carried at the configuration parameter option of desired negotiation in Config-Request message and issue opposite equip., when opposite equip. is received after this Config-Request message, if when can identifying all configuration parameter options that send over and approving the content in all configuration parameter option data territory, can be by the transmitting terminal response to this Config-Request message in intact the configuration parameter option in the configuring request message data field that is placed on Config-Ack message.When the opposite equip. that receives Config-Request message can be identified all configuration parameter options that transmitting terminal sends over, but when the content in partial configuration preference territory is not approved, opposite equip. can be responded a Config-Nak message that carries the configuration parameter option of not approving to transmitting terminal, and now the data content of these configuration parameter options is the value that local terminal is wished.
In the present embodiment, exactly by utilizing function and the negotiation mechanism of the original link configuration message of agreement, and the configuration parameter option of expansion LCP message, realize the negotiation of Keep alive time.Concrete, on the basis of the original config option of agreement, increasing a kind of config option, specified type is 128, and config option name is called Keep alive time, and concrete protocol massages form is as follows:
In the time that local device need to carry out ISSU upgrading, send and carry the Config-Request message that keep-alive time Keep alive time is 0 to the opposite equip. being connected with the built vertical PPP of this equipment.Wherein, in the time that described Keep alive time is 0, represent that described Keep alive time is endless.When opposite equip. is received after this Config-Request message, identify and accept the configuration parameter option in this Config-Request message, after the Keep alive time of local terminal is set to 0, to Config-Ack message of described local device loopback, now the data field of Config-Ack message still carries the configuration parameter that Keep alive time is 0, represents to accept the negotiation request that described local device Keep alive time is 0.
Local device is received after the Config-Ack message of opposite equip. loopback, starts ISSU upgrading.Now the Keep alive time of opposite equip. is 0, and local device can not cause the ppp link down having set up to fall after restarting the CPU of cable card board.
After local device ISSU upgrading finishes, local device sends a Config-Nak message to opposite equip., now in this Config-Nak message, carry the configuration parameter that Keep alive time is 0, represent to require opposite equip. to remove the configuration that Keep alive time is 0.Opposite equip. is received after this Config-Nak message, the configuration that is 0 by the Keep alive time having arranged is removed, and original self Keep alive time Configuration Values or default value is carried in Config-Request message and sends to described local device again to consult Keep alive time, and after described local device loopback Config-Ack message, recover self Keep alive time Configuration Values or default value.
Since then, in whole ISSU escalation process, the negotiations process of Keep alive time completes.
In addition, in the present embodiment, can pass through above protocol interaction, it is not 0 Keep alive time that opposite equip. is arranged to one yet, and its specific implementation process is identical with said process, does not repeat them here.
Known by the above description of the present embodiment, the present invention is by the config option of the existing LCP agreement of expansion, increase a Keep alive time config option newly, and utilize function and the negotiation mechanism of the original link configuration message of agreement, realize the negotiation of Keep alive time, thereby can be before ISSU upgrading starts the Keep alive time of mutual opposite equip. by protocol massages be set to 0, thereby ensure in ISSU escalation process, the ppp link of having set up with opposite equip. not down is fallen, overcome the defect that configures loaded down with trivial details easy omission in prior art.
Refer to Fig. 5; the exemplary one of the present invention preferred embodiment in; the present invention proposes the device 50 of ppp link keep-alive in a kind of ISSU escalation process; be applied on the network equipment; in the hardware structure relating to as the network equipment of carrying apparatus of the present invention 50, generally include CPU, internal memory, nonvolatile memory, IO interface and other hardware.Be embodied as example with software, apparatus of the present invention 50 can be understood as the computer program being carried in internal memory conventionally, the logic device that the software and hardware forming after moving by CPU combines; This device 50 comprises:
Transmitting element 51, for carrying out when this equipment ISSU when upgrading, carries the configuring request message of keep-alive time Keep alive time to the opposite equip. transmission being connected with the built vertical PPP of this equipment; Wherein this configuring request message arranges described Keep alive time for triggering opposite equip. according to the configuring request message of receiving, and sends back message using to the described network equipment after setting completes;
Receiving element 52, the back message using sending for receiving described opposite equip., and receiving after described back message using, start ISSU upgrading.
In the present embodiment, described transmitting element 51 is further used for: after ISSU upgrading finishes, message is denied in the configuration of carrying described Keep alive time to described opposite equip. transmission; Wherein this configuration denies that message denies that according to the configuration of receiving message removes the described Keep alive time having arranged for triggering opposite equip., and recovers Configuration Values or the default value of self Keep alive time.
In the present embodiment, described configuring request message is LCP Configure-request message; Described back message using is LCP Configure-ACK message; Described configuration denies that message is LCP Configure-NAK message.
In the present embodiment, described Keep alive time is 0; Wherein, in the time that described Keep alive time is 0, represent that described Keep alive time is endless.
By the description of above embodiment, it will be appreciated by those skilled in the art that in embodiment, a unit can be merged in the unit in device, also can further split into multiple subelements.
The foregoing is only preferred embodiment of the present invention, in order to limit the present invention, within the spirit and principles in the present invention not all, any amendment of making, be equal to replacement, improvement etc., within all should being included in the scope of protection of the invention.
Claims (8)
1. a method for ppp link keep-alive in ISSU escalation process, is applied on the network equipment, it is characterized in that, described method comprises:
In the time that the described network equipment need to carry out ISSU upgrading, send the configuring request message that carries keep-alive time Keep alive time to the opposite equip. being connected with the built vertical PPP of this equipment; Wherein this configuring request message arranges described Keep alive time for triggering opposite equip. according to the configuring request message of receiving, and sends back message using to the described network equipment after setting completes;
Receive the back message using that described opposite equip. sends, and receiving after described back message using, start ISSU upgrading.
2. the method for claim 1, is characterized in that, described method also comprises:
After ISSU upgrading finishes, message is denied in the configuration of carrying described Keep alive time to described opposite equip. transmission; Wherein this configuration denies that message denies that according to the configuration of receiving message removes the described Keep alive time having arranged for triggering opposite equip., and recovers Configuration Values or the default value of self Keep alive time.
3. method as claimed in claim 2, is characterized in that, described configuring request message is LCP configuring request LCP Configure-request message; Described back message using is that Configure-ACK message is responded in LCP configuration; Described configuration denies that message is that Configure-NAK message is denied in LCP configuration.
4. method as claimed in claim 3, is characterized in that, described Keep alive time is 0;
Wherein, in the time that described Keep alive time is 0, represent that described Keep alive time is endless.
5. a device for ppp link keep-alive in ISSU escalation process, is applied on the network equipment, it is characterized in that, described device comprises:
Transmitting element, for carrying out when this equipment ISSU when upgrading, carries the configuring request message of keep-alive time Keep alive time to the opposite equip. transmission being connected with the built vertical PPP of this equipment; Wherein this configuring request message arranges described Keep alive time for triggering opposite equip. according to the configuring request message of receiving, and sends back message using to the described network equipment after setting completes;
Receiving element, the back message using sending for receiving described opposite equip., and receiving after described back message using, start ISSU upgrading.
6. device as claimed in claim 5, is characterized in that, described transmitting element is further used for:
After ISSU upgrading finishes, message is denied in the configuration of carrying described Keep alive time to described opposite equip. transmission; Wherein this configuration denies that message denies that according to the configuration of receiving message removes the described Keep alive time having arranged for triggering opposite equip., and recovers Configuration Values or the default value of self Keep alive time.
7. device as claimed in claim 6, is characterized in that, described configuring request message is LCP configuring request LCP Configure-request message; Described back message using is that Configure-ACK message is responded in LCP configuration; Described configuration denies that message is that Configure-NAK message is denied in LCP configuration.
8. device as claimed in claim 7, is characterized in that, described Keep alive time is 0; Wherein, in the time that described Keep alive time is 0, represent that described Keep alive time is endless.
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| CN201410079233.5A CN103873294A (en) | 2014-03-05 | 2014-03-05 | Keep-alive method and device for PPP (Point-to-Point Protocol) link during ISSU (In Service Software Upgrade) process |
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| CN201410079233.5A CN103873294A (en) | 2014-03-05 | 2014-03-05 | Keep-alive method and device for PPP (Point-to-Point Protocol) link during ISSU (In Service Software Upgrade) process |
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| CN104283739A (en) * | 2014-10-20 | 2015-01-14 | 杭州华三通信技术有限公司 | Detection method and device based on distributed ISSU |
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| CN106911696A (en) * | 2017-02-28 | 2017-06-30 | 新华三技术有限公司 | A kind of keep Alive Packet transmission method and device |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106911696A (en) * | 2017-02-28 | 2017-06-30 | 新华三技术有限公司 | A kind of keep Alive Packet transmission method and device |
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Address after: 310052 Binjiang District Changhe Road, Zhejiang, China, No. 466, No. Applicant after: Xinhua three Technology Co., Ltd. Address before: 310053 Hangzhou hi tech Industrial Development Zone, Zhejiang province science and Technology Industrial Park, No. 310 and No. six road, HUAWEI, Hangzhou production base Applicant before: Huasan Communication Technology Co., Ltd. |
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