CN108306995B - Method and system for realizing mutual binding of MAC addresses of local MEP and remote MEP - Google Patents
Method and system for realizing mutual binding of MAC addresses of local MEP and remote MEP Download PDFInfo
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- CN108306995B CN108306995B CN201810006877.XA CN201810006877A CN108306995B CN 108306995 B CN108306995 B CN 108306995B CN 201810006877 A CN201810006877 A CN 201810006877A CN 108306995 B CN108306995 B CN 108306995B
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04L2101/00—Indexing scheme associated with group H04L61/00
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- H04L2101/618—Details of network addresses
- H04L2101/622—Layer-2 addresses, e.g. medium access control [MAC] addresses
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- H—ELECTRICITY
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- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
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Abstract
The invention discloses a method and a system for realizing mutual binding of MAC addresses of a local MEP and a remote MEP, wherein the method comprises the following steps: s1: acquiring an identifier of a remote MEP; s2: the local end MEP multicast sends and sends a first message, wherein the first message comprises the first MAC address and the identification of the local end MEP; s3: the remote MEP corresponding to the identifier sends a first response message by taking the first MAC address as a destination address, wherein the first response message comprises a second MAC address of the remote MEP; s4: and associating the second MAC address with the identifier of the remote MEP to finish the binding of the MAC address of the local MEP and the remote MEP.
Description
Technical Field
The invention relates to the technical field of OAM (Operation Administration and Maintenance) of Ethernet, in particular to a method for learning an MAC (media access control) address of a remote MEP (multimedia message protocol) through an LB (LoopBack) function of CFM (ring back protocol).
Background
As an important ethernet link level OAM, CFM (Connectivity Fault Management) is used to implement an end-to-end OAM monitoring and Management function of a service layer, and is widely applied in PTN devices.
As networking environments become more complex, the configuration scenario of CFM becomes complex. In the configuration process of CFM, the MEP at the local end is required to complete the binding of the identifier of the remote MEP and the port MAC address. The existing CFM configuration methods have two types:
firstly, after the function of the CC needs to be enabled between the ports of the configured MEPs, the respective MAC addresses are learned through the interaction of the CCM messages between the MEPs and the binding of the MAC addresses to the MEP identifiers is completed, and after the CC function is started, the CCM messages are continuously interacted between the devices according to the set (fastest 300 per second) frequency, so that certain network bandwidth and CPU processing resources are sacrificed.
And if the CC is not enabled under the interface, manually binding after manually inquiring the port MAC address of the opposite end MEP in a static mode is required, so that the method is inconvenient and inflexible and is not beneficial to network change and expansion.
Disclosure of Invention
The present invention is directed to solving the problems described above. Specifically, the invention provides a method and a system for rapidly learning the MAC address of a remote MEP.
The invention firstly provides a method for realizing the mutual binding of MAC addresses of a local MEP and a remote MEP, which comprises the following steps:
s1: acquiring an identifier of a remote MEP;
s2: the local end MEP multicast sends and sends a first message, wherein the first message comprises the first MAC address and the identification of the local end MEP;
s3: the remote MEP corresponding to the identifier sends a first response message by taking the first MAC address as a destination address, wherein the first response message comprises a second MAC address of the remote MEP;
s4: and associating the second MAC address with the identifier of the remote MEP to finish the binding of the MAC address of the local MEP and the remote MEP.
According to the method for binding MAC addresses with each other provided in the present invention, the step S1 obtains the identifier of the remote MEP by executing the LB command in the CFM protocol.
According to the method for mutually binding MAC addresses provided by the present invention, before the step S2, a step of determining whether the remote MEP is already associated with the second MAC address is further included, which specifically includes:
searching a learning MAC address and a static binding MAC address of the remote MEP based on the identification of the remote MEP, wherein if any one of the learning MAC address and the static binding MAC address is valid, the remote MEP is associated with the second MAC address;
if the learned MAC address and the statically bound MAC address are both invalid, the remote MEP is not associated with the second MAC address.
According to the method for binding MAC addresses provided by the present invention, when the remote MEP and the second MAC address are not associated, and the first message is a multicast message, the step S3 includes:
s31: the remote MEP receives and analyzes the multicast message;
s32: the first MAC address is used as a destination address of the first response message, the second MAC address is used as a source address, and the first response message is packaged;
s33: and the remote MEP sends the first response message to the local MEP.
According to the method for mutually binding MAC addresses provided by the present invention, the step S4 includes:
s41: the local end MEP receives and analyzes the first response message;
s42: and finishing the binding of the MAC address of the local MEP and the remote MEP.
The invention also provides a system for realizing the mutual binding of the MAC addresses of the local MEP and the remote MEP, which comprises the following steps:
the identification acquisition module is used for acquiring the identification of the remote MEP;
a message sending module, connected to the identifier obtaining module, configured to send, by a home MEP, a first message to the remote MEP, where the first message includes the first MAC address of the home MEP and the identifier;
a message response module, connected to the message sending module, configured to send, by the remote MEP corresponding to the identifier, a first response message using the first MAC address as a destination address, where the first response message includes a second MAC address of the remote MEP;
and the binding module is connected with the message response module and used for associating the second MAC address with the far-end MEP identifier to finish the binding of the MAC addresses of the local MEP and the far-end MEP.
According to the system for mutually binding MAC addresses, provided by the invention, the identification acquisition module acquires the identification of the remote MEP by executing an LB command in a CFM protocol.
According to the system for mutually binding the MAC addresses provided by the invention, the method further comprises the following steps between the identifier acquisition module and the message sending module:
an association determining module, configured to determine whether the identifier of the remote MEP is already associated with the second MAC address; the judging step comprises:
searching a learning MAC address and a static binding MAC address of the remote MEP based on the identification of the remote MEP, wherein if any one of the learning MAC address and the static binding MAC address is valid, the remote MEP is associated with the second MAC address;
if the learned MAC address and the statically bound MAC address are both invalid, the remote MEP is not associated with the second MAC address.
According to the system for mutually binding the MAC addresses provided by the present invention, when the remote MEP and the second MAC address are not associated, the first message packet is a multicast packet.
According to the system for mutually binding the MAC addresses, provided by the invention, the step of sending the first response message by the message response module comprises the following steps:
the remote MEP receives the multicast message and analyzes the multicast message;
the first MAC address is used as a destination address of the first response message, the second MAC address is used as a source address, and the first response message is packaged;
and the remote MEP sends the first response message to the local MEP.
Compared with the prior art, the invention can learn the MAC address of the remote MEP only by executing the LB function of the CFM once under the local MEP interface, and does not need to rely on the CC function in the CEM and statically bind the MAC address and the identification of the remote MEP. Therefore, the invention can greatly reduce the occupation of bandwidth and CPU resources and realize the flexible migration of configuration.
Other characteristic features and advantages of the invention will become apparent from the following description of exemplary embodiments, which is to be read in connection with the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention. In the drawings, like reference numerals are used to indicate like elements. The drawings in the following description are directed to some, but not all embodiments of the invention. For a person skilled in the art, other figures can be derived from these figures without inventive effort.
FIG. 1 is an overall flow chart illustrating MAC address binding according to the present invention;
fig. 2 exemplarily depicts a flowchart of a local MEP sending a first message to a remote MEP in the present invention;
fig. 3 exemplarily depicts a flowchart of the present invention in which a remote MEP sends a first reply packet to a home MEP;
fig. 4 exemplarily depicts a flow chart of the present invention for binding the learned MAC addresses of the home MEP and the remote MEP to each other;
fig. 5 exemplarily depicts a structural diagram of a system in which MAC addresses are bound to each other according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.
As is well known to those skilled in the art, the CFM mainly implements monitoring and management functions through the following 5 messages, respectively:
continuity Check Message (CCM): a multicast CFM protocol data unit. MEPs (maintenance association endpoints) periodically send CCMs to confirm the continuity of an MA (maintenance association) owned MEP through the MA.
Link Trace Message (LTM): an MEP originated CFM PDU is used to trace the path from MIP (maintenance domain intermediate point) to the destination MAC address until the LTM reaches its destination MEP or can no longer be forwarded. Each MP (maintenance point) in the path generates a LTR (Link Trace Reply).
Link Trace response (LTR, Link Trace Reply): after receiving the LTM from the MEP, the MP sends a unicast message back to the source MEP.
Loopback Message (LBM, Loop Back Message): the MEP sends unicast CFM PDUs to the designated MP and expects to receive LBRs.
Loop Back response (LBR, Loop Back Reply): after receiving the LBM from the MEP, the MP sends a unicast message back to the MEP.
The technical scheme of the invention for binding the MAC addresses of the local MEP and the remote MEP with each other does not use the conventional CC function, but utilizes the LB (loopback) function in CFM to bind the MAC address of the remote MEP, thereby achieving the purposes of reducing resource occupation and flexible configuration. Firstly, acquiring the identifier of a remote MEP by executing an LB command; judging whether the binding is performed or not through the acquired identifier; if not, learning the MAC address of the remote MEP and realizing binding by the way that the local MEP sends the LBM multicast message and the remote MEP responds to the LBR unicast message.
The method for judging whether the binding is performed or not through the acquired identifier comprises the following steps: and using the acquired identification value as a key word to search the learning MAC address and the static binding MAC address of the remote MEP from the MAC address table. If either of these two MAC addresses is valid, this indicates that the MAC address of the remote MEP has been statically bound or that the learning of the MAC address has been completed. Otherwise, when both addresses are invalid, the MAC address needs to be learned and bound.
The method for mutually binding the MAC addresses specifically comprises the following steps:
s1: acquiring an identifier of a remote MEP;
s2: sending a first message to the remote MEP, wherein the first message contains a first MAC address of the local MEP;
s3: the remote MEP sends a first response message by taking the first MAC address as a destination address, wherein the first response message comprises a second MAC address of the remote MEP;
s4: and associating the second MAC address with the identifier of the remote MEP to finish the binding of the MAC address of the local MEP and the remote MEP.
In step S1, the present invention obtains the identity of the remote MEP by executing the LB command in the CFM protocol.
Preferably, the step S2 is preceded by a step of determining whether the remote MEP is already associated with the second MAC address, which specifically includes:
searching a learning MAC address and a static binding MAC address of the remote MEP based on the identification of the remote MEP, wherein if any one of the learning MAC address and the static binding MAC address is valid, the remote MEP is associated with the second MAC address;
if the learned MAC address and the statically bound MAC address are both invalid, the remote MEP is not associated with the second MAC address.
According to the method for binding MAC addresses provided by the present invention, when the remote MEP and the second MAC address are not associated, and the first message is a multicast message, the step S3 includes:
s31: the remote MEP receives and analyzes the multicast message;
s32: the first MAC address is used as a destination address of the first response message, the second MAC address is used as a source address, and the first response message is packaged;
s33: and the remote MEP sends the first response message to the local MEP.
According to the method for binding MAC addresses, the step S4 includes:
s41: the local end MEP receives and analyzes the first response message;
s42: and finishing the binding of the MAC address of the local MEP and the remote MEP.
The following describes specific embodiments of the present invention.
Fig. 1 shows a flowchart of sending a first message from a home MEP to a remote MEP in the present invention, which covers the above steps S1 and S2. Referring to fig. 1, after completing the basic configuration of CEM, the home MEP parses and obtains the identifier of the remote MEP from the LB command line by executing the LB command, and uses the value of the identifier as a key to search the learning MAC address and the static binding MAC address of the remote MEP. If either of these two MAC addresses is valid, this indicates that the MAC address of the remote MEP has been statically bound or that the learning of the MAC address has been completed. Otherwise, when both addresses are invalid, the MAC address needs to be learned and bound. The following flow is continued.
And encapsulating the LBM first message, wherein the destination address is a multicast MAC address. In one embodiment, the multicast MAC address has 48 bits, and the first 44 bits are the fixed address "01: 80: c2: 00: 00: 3x ", the last 4 bits are the maintenance domain levels of the home MEP (total of 8 levels, values 0 to 7). The source address is the port MAC address of the home MEP. And the LBM after the assembly is transmitted to a transmitting chip through the transmitting channel, the transmitting chip analyzes the message, inquires an MAC table through two-layer logic, finds a service outgoing interface of the message and transmits the service outgoing interface to the remote EMP.
Fig. 2 shows a flowchart of sending a first reply packet from a remote MEP to a home MEP according to the present invention. After the port of the far-end MEP receives the first message of the LBM of the multicast, the access control table of the forwarding chip matches the key field of the message, and the hit first message of the LBM is delivered to the software for processing through the uploading channel. The software analyzes the first LBM message, uses the source MAC address field of the LBM as the target MAC of the first LBR response message, uses the port address of the MEP as the source MAC address, completes the encapsulation of the LBR unicast first response message, and then forwards the message to the forwarding chip through the down channel by the software, and also through the two-layer logic, queries the MAC table, finds the service output interface of the message, and forwards the message to the source end MEP through the output interface.
Fig. 3 is a flowchart illustrating binding of learned MAC addresses of the home MEP and the remote MEP according to the present invention. After receiving the first response message of LBR, the MEP port of the home terminal matches the key field of the message by the access control table of the forwarding chip, and then transfers the hit message to the software for processing through the uploading channel. And the software analyzes the source MAC address from the LBR first response message and then corresponds to the identifier of the remote MEP to finish binding. Thus, the home MEP learns the MAC address of the remote MEP.
The invention also provides a system for realizing the mutual binding of the MAC addresses of the local MEP and the remote MEP, which comprises the following steps:
the identification acquisition module is used for acquiring the identification of the remote MEP;
a message sending module, connected to the identifier obtaining module, configured to send, by a home MEP, a first message to the remote MEP, where the first message includes the first MAC address of the home MEP and the identifier;
a message response module, connected to the message sending module, configured to send, by the remote MEP corresponding to the identifier, a first response message using the first MAC address as a destination address, where the first response message includes a second MAC address of the remote MEP;
and the binding module is connected with the message response module and used for associating the second MAC address with the far-end MEP identifier to finish the binding of the MAC addresses of the local MEP and the far-end MEP.
Preferably, the identity obtaining module obtains the identity of the remote MEP by executing an LB command in the CFM protocol.
Preferably, the method further includes, between the identifier obtaining module and the message sending module:
an association determining module, configured to determine whether the identifier of the remote MEP is already associated with the second MAC address; the judging step comprises:
searching a learning MAC address and a static binding MAC address of the remote MEP based on the identification of the remote MEP, wherein if any one of the learning MAC address and the static binding MAC address is valid, the remote MEP is associated with the second MAC address;
if the learned MAC address and the statically bound MAC address are both invalid, the remote MEP is not associated with the second MAC address.
According to the system for mutually binding the MAC addresses provided by the present invention, when the remote MEP and the second MAC address are not associated, the first message packet is a multicast packet.
According to the system for mutually binding the MAC addresses, which is provided by the invention, the step of sending the first response message by the message response module comprises the following steps:
the remote MEP receives the multicast message and analyzes the multicast message;
the first MAC address is used as a destination address of the first response message, the second MAC address is used as a source address, and the first response message is packaged;
and the remote MEP sends the first response message to the local MEP.
Referring to fig. 4, a schematic structural diagram of a system for binding MAC addresses with each other according to the present invention is shown, where the system includes an identifier obtaining module, an association determining module, a message sending module, a message response module, and a binding module.
The identification acquisition module is used for acquiring the identification of the remote MEP by executing an LB command in the CFM protocol; the association judging module is connected with the identification obtaining module and used for judging whether the identification of the remote MEP is associated with the second MAC address; the message sending module is connected with the association judging module and used for the local MEP to send a first message to the remote MEP, wherein the first message contains a first MAC address of the local MEP; the message response module is connected with the message sending module and is used for the remote MEP to send a first response message by taking the first MAC address as a destination address, wherein the first response message comprises a second MAC address of the remote MEP; and the binding module is connected with the message response module and used for associating the second MAC address with the far-end MEP identifier to finish the binding of the MAC addresses of the local MEP and the far-end MEP.
The above-described aspects may be implemented individually or in various combinations, and such variations are within the scope of the present invention.
Finally, it should be noted that: the above examples are only for illustrating the technical solutions of the present invention, and are not limited thereto. Although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (6)
1. A method for realizing mutual binding of MAC addresses of a local MEP and a remote MEP is characterized by comprising the following steps:
s1: acquiring an identifier of a remote MEP;
s2: the MEP of the local end multicasts and sends a first message, wherein the first message comprises a first MAC address and the identification of the MEP of the local end;
s3: the remote MEP corresponding to the identifier sends a first response message by taking the first MAC address as a destination address, wherein the first response message comprises a second MAC address of the remote MEP;
s4: associating the second MAC address with the identifier of the remote MEP to complete the binding of the MAC address of the local MEP and the remote MEP;
the step S1 obtains the identification of the remote MEP by executing the LB command in the CFM protocol;
before step S2, the method further includes a step of determining whether the remote MEP is already associated with the second MAC address, which specifically includes:
searching a learning MAC address and a static binding MAC address of the remote MEP based on the identification of the remote MEP, wherein if any one of the learning MAC address and the static binding MAC address is valid, the remote MEP is associated with the second MAC address;
if the learned MAC address and the statically bound MAC address are both invalid, the remote MEP is not associated with the second MAC address.
2. The method according to claim 1, wherein when the remote MEP and the second MAC address are not associated, and the first message is a multicast message, the step S3 includes:
s31: the remote MEP receives and analyzes the multicast message;
s32: the first MAC address is used as a destination address of the first response message, the second MAC address is used as a source address, and the first response message is packaged;
s33: and the remote MEP sends the first response message to the local MEP.
3. The method according to claim 1 or 2, wherein the step S4 includes:
s41: the local end MEP receives and analyzes the first response message;
s42: and finishing the binding of the MAC address of the local MEP and the remote MEP.
4. A system for implementing mutual binding of MAC addresses of a local MEP and a remote MEP, comprising:
the identification acquisition module is used for acquiring the identification of the remote MEP;
a message sending module, connected to the identifier obtaining module, configured to send, by a home MEP, a first message to the remote MEP, where the first message includes the first MAC address of the home MEP and the identifier;
a message response module, connected to the message sending module, configured to send, by the remote MEP corresponding to the identifier, a first response message using the first MAC address as a destination address, where the first response message includes a second MAC address of the remote MEP;
a binding module, connected to the message response module, for associating the second MAC address with the remote MEP identifier to complete the binding between the local MEP and the MAC address of the remote MEP;
the identification acquisition module acquires the identification of the remote MEP by executing an LB command in a CFM protocol;
the method also comprises the following steps between the identification acquisition module and the message sending module:
an association determining module, configured to determine whether the identifier of the remote MEP is already associated with the second MAC address; the judging step comprises:
searching a learning MAC address and a static binding MAC address of the remote MEP based on the identification of the remote MEP, wherein if any one of the learning MAC address and the static binding MAC address is valid, the remote MEP is associated with the second MAC address;
if the learned MAC address and the statically bound MAC address are both invalid, the remote MEP is not associated with the second MAC address.
5. The system of claim 4, wherein the first message packet is a multicast packet when the remote MEP and the second MAC address are not associated.
6. The system of claim 5, wherein the step of the message reply module sending a first reply message comprises:
the remote MEP receives the multicast message and analyzes the multicast message;
the first MAC address is used as a destination address of the first response message, the second MAC address is used as a source address, and the first response message is packaged;
and the remote MEP sends the first response message to the local MEP.
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| US8184526B2 (en) * | 2008-09-15 | 2012-05-22 | Ciena Corporation | Systems and methods for Connectivity Fault Management extensions for automated activation of services through association of service related attributes |
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| CN101521603A (en) * | 2008-12-26 | 2009-09-02 | 中兴通讯股份有限公司 | Method and system for quickly detecting connectivity of link |
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