CN101051961A - Loopback control method and device - Google Patents

Loopback control method and device Download PDF

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Publication number
CN101051961A
CN101051961A CNA2007101017601A CN200710101760A CN101051961A CN 101051961 A CN101051961 A CN 101051961A CN A2007101017601 A CNA2007101017601 A CN A2007101017601A CN 200710101760 A CN200710101760 A CN 200710101760A CN 101051961 A CN101051961 A CN 101051961A
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China
Prior art keywords
loopback
message
port
vlan
attribute
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CNA2007101017601A
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Chinese (zh)
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CN100466565C (en
Inventor
史计达
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New H3C Technologies Co Ltd
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Hangzhou H3C Technologies Co Ltd
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Priority to CNB2007101017601A priority Critical patent/CN100466565C/en
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Abstract

The method comprises: when the loop-back device monitors a loop-back of VLAN existed on a port; the attribute of the port is set as 'banning the passing of VLAN message having loop-back'; after receiving the message from said port, the loop-back device decides if the message is a VLAN message having loop-back; if yes, the message will be abandoned; otherwise, relaying the message. The invention also provides a device for control the loop-back, which comprises an attribute setting unit and a message relaying unit.

Description

Loopback control method and device
Technical field
The present invention relates to the network communications technology, relate in particular to a kind of loopback control method and device.
Background technology
In existing various networkings, because mistakes such as network configuration or network connections, tending to produce forwarding loop is loopback.If there is forwarding loop in the network, the message that sends of the network equipment such as the network equipment 1 then, may be after other network equipment be transmitted, received by the network equipment 1 again, and the network equipment 1 also can forward these messages that had sent itself after receiving once more, and circulation is gone down always.Easy like this cause message repeat in a large number transmit, and then cause the consumption of Internet resources even the paralysis of network.The purpose of loopback monitoring is exactly whether the port of monitoring network equipment loop occurs.After the loopback monitoring function of port was opened, just the loopback monitoring equipment is monitored each port in real time whether by external loop, if find certain port by loopback, the loopback monitoring equipment will cut out this port, so that the influence of loop is effectively controlled.
But in actual networking, the way of this direct close port has certain restriction.Such as, in having the network environment of Virtual Local Area Network, the port of loopback monitoring equipment can be supported the VLAN that one or more are different.The situation of hanging a plurality of different VLAN for a port, if a port allows the message of M VLAN to pass through, then the loopback monitoring equipment can regularly send M loopback monitoring message that carries this machine sign and VLAN sign from this port, one of each VLAN, and determine whether to occur loopback, and determine it specifically is that loopback appears in which VLAN by the VLAN sign of carrying in the message by the loopback monitoring message that judges whether to receive this machine of carrying sign.If there is loopback in certain VLAN on the loopback monitoring equipment monitoring outbound port, so, the loopback monitoring equipment will directly fall this port shutdown.That is to say that all users under this port can not accesses network, no matter and whether the user belongs to the VLAN that has loopback.Obviously, the way of this direct close port is not to existing the normal users unfairness of loopback.
Such as, referring to networking structure shown in Figure 1, support the loopback monitoring equipment of loopback monitoring to link to each other respectively with corridor switch 2 with corridor switch 1, the corridor switch has connected user 1, user 2 and user 3 for 1 time.Wherein, corridor switch 1 is not supported the loopback monitoring, and user 1, user 2 and user 3 belong to different VLAN:VLAN 1, VLAN 2 and VLAN 3 respectively.Suppose that in Fig. 1 it is that VLAN 1 exists loopback that loopback appears in user 1 place, so, the loopback monitoring equipment can be that port one is closed with the port that self is connected with corridor switch 1 directly monitoring after there is loopback in VLAN1.Directly the result of close port 1 is: not only exist the user 1 of loopback can not accesses network, do not exist the user 2 of loopback and the user 3 equally also can't accesses network.Obviously, this is inequitable to user 2 and user 3.As seen, the loopback control method of existing direct close port has a negative impact to normal users easily, causes the service disconnection of normal users.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of loopback control method and device, avoids the influence that the normal users business is caused owing to direct close port.
For achieving the above object, loopback control method provided by the invention is as follows:
After the loopback monitoring equipment monitored and has VLAN to have loopback on the port, the attribute of this port was set to forbid existing the VLAN message of loopback to pass through;
After the loopback monitoring equipment receives message from described port, judge whether the message receive is the VLAN message that has loopback, if, then according to the port attribute that is provided with directly with this packet loss; Otherwise, carry out message according to normal forwarding process and transmit.
Wherein, the attribute of described this port be set to forbid to exist loopback the VLAN message by comprising: the loopback monitoring equipment is deleted described port from the VLAN that has loopback.
The attribute of described this port is set to forbid to exist the VLAN message of loopback by comprising: the loopback monitoring equipment issues the acl rule that the VLAN message of forbidding existing loopback passes through at described port.
Whether the message that described judgement is received is to exist the VLAN message of loopback to comprise: the loopback monitoring equipment judges according to the entrained VLAN sign of the message of receiving whether this message is the VLAN message that has loopback.
This method further comprises: timer is set;
Described loopback monitoring equipment comprises after monitoring and having VLAN to have loopback on the port: start described timer, behind timer expiry, the attribute of described port is set to allow to exist the VLAN message of loopback to pass through, and described port is carried out the loopback monitoring again.
The present invention also provides a kind of loopback control device, comprising: attribute is provided with unit and message retransmission unit, wherein,
Attribute is provided with the unit, be used for monitor have VLAN to have loopback on the port after, the attribute of this port is set to forbid existing the VLAN message of loopback to pass through, and the port attribute information that is provided with is sent to the message retransmission unit;
The message retransmission unit after being used for receiving message from described port, judges whether the message of receiving is the VLAN message that has loopback, if, then according to the port attribute that is provided with directly with this packet loss; Otherwise, carry out message according to normal forwarding process and transmit.
This device further comprises: timer;
Described attribute is provided with the unit, be further used for the back being set and start described timer at attribute, behind timer expiry, the attribute of described port is set to allow to exist the VLAN message of loopback to pass through, and the port attribute information that is provided with is sent to the message retransmission unit;
The message retransmission unit is used for carrying out message according to the port attribute information of receiving and transmits.
This shows, in the present invention, after there is loopback in certain VLAN on port of loopback monitoring equipment discovery, not that this port is directly closed, but being set, this port do not allow to exist the message of the VLAN of loopback to pass through, this message directly abandoned do not carry out transmitting, other does not exist the message of the VLAN of loopback then to handle according to normal forwarding process.So not only can effectively control the influence of loopback, prevent message repeat in a large number transmit; Simultaneously, can also guarantee under this port that the data forwarding of the normal users that there is not loopback in other is unaffected, they still can normally communicate.
Description of drawings
Fig. 1 is a networking structure schematic diagram of the prior art.
Fig. 2 is the loopback control method flow chart in the embodiment of the invention.
Fig. 3 is the networking structure schematic diagram in the embodiment of the invention.
Fig. 4 is the loopback control device structural representation in the embodiment of the invention.
Embodiment
For making purpose of the present invention, technical scheme and advantage clearer, the embodiment that develops simultaneously with reference to the accompanying drawings is described in further detail the present invention.
Describe as seen by background technology, support at the port of loopback monitoring equipment under the situation of a plurality of different VLAN, if there is loopback in one of them VLAN on the port, and there is not loopback in other VLAN, the loopback monitoring equipment will directly fall this port shutdown so, thereby causes the normal users also can't accesses network.
In order to overcome the problems referred to above, the invention provides a kind of loopback control method.Referring to shown in Figure 2, this method mainly may further comprise the steps:
Step 201: after the loopback monitoring equipment monitored and has VLAN to have loopback on the port, the attribute of this port was set to forbid existing the VLAN message of loopback to pass through.
Step 202: after the loopback monitoring equipment receives message from described port, judge whether the message of receiving is the VLAN message that has loopback, if then execution in step 203; Otherwise, execution in step 204.
Step 203: the loopback monitoring equipment according to the port attribute that is provided with directly with the packet loss of receiving, and the processing of process ends.
Step 204: the loopback monitoring equipment carries out message according to normal forwarding process and transmits.
That is to say, after there is loopback in certain VLAN on port of loopback monitoring equipment discovery, need not this port is directly closed, but being set, this port do not allow to exist the message of the VLAN of loopback to pass through, to fall from the packet filtering that belongs to the VLAN that has loopback that this port receives, do not transmit, other does not exist the message of the VLAN of loopback then to handle according to normal forwarding process.So not only can effectively control the influence of loopback, prevent message repeat in a large number transmit; Simultaneously, the user data that can also guarantee under this port the VLAN that there is not loopback in other is transmitted unaffected, and they still can normally communicate.
Such as, in network environment shown in Figure 3, supposing to monitor out user 1 by the loopback monitoring equipment, loopback to occur be that VLAN 1 exists loopback, and so, the port one that the loopback monitoring equipment just can self connect corridor switch 1 is set to not allow the message of VLAN 1 to pass through.Like this, the loopback message that carries VLAN 1 sign that user 1 produces will directly be abandoned after arriving the loopback monitoring equipment, do not have the user 2 of loopback, the message that carries VLAN 2, VLAN 3 signs of user's 3 generations then can normally to be transmitted, user 2 and user 3 can continue by corridor switch 1 and loopback monitoring equipment accesses network.
Wherein, the loopback monitoring equipment can limit the message transmissions of the VLAN that has loopback by the mode of configuration vlan table or arranging access control list (ACL).
Vlan table has write down the port information that each VLAN had.After the loopback monitoring equipment receives the message that carries certain VLAN sign from a port, at first need to carry out the vlan table coupling, check promptly whether this port is included in the port information of the corresponding VLAN of the entrained VLAN sign of this message, if, determine that then this message is legal, handles according to normal forwarding process; Otherwise, determine that this message is illegal, do not transmit.In network environment shown in Figure 3, the loopback monitoring equipment can be deleted port one monitoring out after there is loopback in VLAN 1 from the port information of VLAN 1.Like this, receive the message that carries VLAN 1 sign from port one when the loopback monitoring equipment after, it can find that by the port information of checking VLAN 1 port one is not comprised among the VLAN 1, so directly abandon this message, does not do other any processing.
ACL is a series of matched rules that the network equipment adopts for the filtering data bag.In network environment shown in Figure 3, the loopback monitoring equipment is monitored out after there is loopback in VLAN 1, can dynamically issue the acl rule that a message of forbidding existing the VALN 1 of loopback passes through at port one.Like this, after the loopback monitoring equipment receives the message that carries VLAN 1 sign from port one, according to this acl rule directly with VLAN 1 packet loss of receiving.
In addition, owing to exist the VLAN of loopback after after a while, may recover normal, therefore, recover the situation that the message of normal VLAN can not be transmitted always afterwards takes place for fear of loopback occurring before, the loopback monitoring equipment is after monitoring loopback, can set up a wrapped state table, be in slave mode (Controlled) in order to which user of which port of mark, slave mode lasts long.
VLAN ID STATE PORT AGING(s)
1 Controlled E1/0/1 5
Table 1
Table 1 shows the concrete structure with the corresponding wrapped state table of networking shown in Figure 3, comprising: VLAN identifies (VLAN ID), state (STATE), port (PORT) and this four part of timer ageing time (AGING).By table 1 as seen, the VLAN 1 on the port E1/0/1 (being the port one among Fig. 3) is in slave mode, and current controlled duration has reached 5 seconds.
The loopback monitoring equipment exists on loopback and the blocking-up port E1/0/1 in VLAN 1 message transmissions monitoring VLAN 1, can start timer.Be timer expiry after the timer ageing time surpasses the value of setting (as 10 seconds) after, the loopback monitoring equipment need be cancelled port E1/0/1 upward to the restriction of VLAN 1 message, that is to say, the message that allows VLAN 1 is by port E1/0/1.Such as, port E1/0/1 is joined among the VLAN 1 again, perhaps issue the acl rule on port E1/0/1 before the cancellation based on VLAN 1.Simultaneously, the loopback monitoring equipment also will carry out the loopback monitoring to port E1/0/1 again, to determine whether to exist loopback, if there is not loopback, does not then do any processing; If monitor loopback, then to handle according to method provided by the present invention again, there is the message transmissions of the VLAN of loopback in blocking-up.
In addition, safeguard that the wrapped state table to the taking of loopback monitoring equipment resource, can not monitor under the situation of VLAN 1 loopback at several (as 3) loopback monitoring periods, deletion and VLAN 1 pairing wrapped state list item in order to reduce.
Referring to shown in Figure 4, the present invention also provides a kind of loopback control device, mainly comprises: attribute is provided with unit and message retransmission unit.Wherein,
Attribute is provided with the unit, be used for monitor have VLAN to have loopback on the port after, the attribute of this port is set to forbid existing the VLAN message of loopback to pass through, and the port attribute information that is provided with is sent to the message retransmission unit;
The message retransmission unit after being used for receiving message from described port, judges whether the message of receiving is the VLAN message that has loopback, if, then according to the port attribute that is provided with directly with this packet loss; Otherwise, carry out message according to normal forwarding process and transmit.
This loopback control device also can further comprise: timer;
Described attribute is provided with the unit, be further used for the back being set and start described timer at attribute, behind timer expiry, the attribute of described port is set to allow to exist the VLAN message of loopback to pass through, and the port attribute information that is provided with is sent to the message retransmission unit;
The message retransmission unit is used for carrying out message according to the port attribute information of receiving and transmits.
The above has carried out further detailed description to purpose of the present invention, technical scheme and beneficial effect; institute is understood that; the above is not in order to restriction the present invention; within the spirit and principles in the present invention all; any modification of being made, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (7)

1, a kind of loopback control method is characterized in that, comprising:
After the loopback monitoring equipment monitored and has VLAN to have loopback on the port, the attribute of this port was set to forbid existing the VLAN message of loopback to pass through;
After the loopback monitoring equipment receives message from described port, judge whether the message receive is the VLAN message that has loopback, if, then according to the port attribute that is provided with directly with this packet loss; Otherwise, carry out message according to normal forwarding process and transmit.
2, method according to claim 1 is characterized in that, the attribute of described this port is set to forbid to exist the VLAN message of loopback by comprising: the loopback monitoring equipment is deleted described port from the VLAN that has loopback.
3, method according to claim 1 is characterized in that, the attribute of described this port is set to forbid to exist the VLAN message of loopback by comprising: the loopback monitoring equipment issues the acl rule that the VLAN message of forbidding existing loopback passes through at described port.
4, method according to claim 1, it is characterized in that whether the message that described judgement is received is to exist the VLAN message of loopback to comprise: the loopback monitoring equipment judges according to the entrained VLAN sign of the message of receiving whether this message is the VLAN message that has loopback.
5, according to each described method of claim 1 to 4, it is characterized in that this method further comprises: timer is set;
Described loopback monitoring equipment comprises after monitoring and having VLAN to have loopback on the port: start described timer, behind timer expiry, the attribute of described port is set to allow to exist the VLAN message of loopback to pass through, and described port is carried out the loopback monitoring again.
6, a kind of loopback control device is characterized in that, comprising: attribute is provided with unit and message retransmission unit, wherein,
Attribute is provided with the unit, be used for monitor have VLAN to have loopback on the port after, the attribute of this port is set to forbid existing the VLAN message of loopback to pass through, and the port attribute information that is provided with is sent to the message retransmission unit;
The message retransmission unit after being used for receiving message from described port, judges whether the message of receiving is the VLAN message that has loopback, if, then according to the port attribute that is provided with directly with this packet loss; Otherwise, carry out message according to normal forwarding process and transmit.
7, device according to claim 6 is characterized in that, this device further comprises: timer;
Described attribute is provided with the unit, be further used for the back being set and start described timer at attribute, behind timer expiry, the attribute of described port is set to allow to exist the VLAN message of loopback to pass through, and the port attribute information that is provided with is sent to the message retransmission unit;
The message retransmission unit is used for carrying out message according to the port attribute information of receiving and transmits.
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WO2015085748A1 (en) * 2013-12-13 2015-06-18 中兴通讯股份有限公司 Switching device and packet loss method therefor
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US20210111983A1 (en) * 2014-09-04 2021-04-15 Accedian Networks Inc. System and method for loopback and network loop detection and analysis

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JP4297437B2 (en) * 2004-08-25 2009-07-15 日本電信電話株式会社 Method and program for detecting loop of bridge device, and bridge device
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US9276975B2 (en) 2010-03-24 2016-03-01 Thomson Licensing Method and apparatus for monitoring quality of service of network
CN101848121A (en) * 2010-06-09 2010-09-29 神州数码网络(北京)有限公司 Automatic port loop detecting and protecting method based on a plurality of VLANs
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US20210111983A1 (en) * 2014-09-04 2021-04-15 Accedian Networks Inc. System and method for loopback and network loop detection and analysis
US11516108B2 (en) * 2014-09-04 2022-11-29 Accedian Networks Inc. System and method for loopback and network loop detection and analysis

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