CN115065614B - Method for identifying multi-activity service connectivity of VPWS - Google Patents
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L43/00—Arrangements for monitoring or testing data switching networks
- H04L43/08—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters
- H04L43/0805—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters by checking availability
- H04L43/0811—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters by checking availability by checking connectivity
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/46—Interconnection of networks
- H04L12/4641—Virtual LANs, VLANs, e.g. virtual private networks [VPN]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
- H04L41/06—Management of faults, events, alarms or notifications
- H04L41/0631—Management of faults, events, alarms or notifications using root cause analysis; using analysis of correlation between notifications, alarms or events based on decision criteria, e.g. hierarchy, tree or time analysis
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
- H04L41/06—Management of faults, events, alarms or notifications
- H04L41/0654—Management of faults, events, alarms or notifications using network fault recovery
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Abstract
The invention discloses a method for identifying multi-activity service connectivity of VPWS, which comprises the following steps: creating an EVPN VPWS dual-homing dual-activity scene; according to the double-activity routing rule, sending CCM (continuous message) messages of an AC (alternating current) port of equipment PE3 in a scene to home equipment in the scene, wherein the home equipment can normally send and receive the CCM messages, opposite-end home equipment cannot normally send and receive the CCM messages, and the opposite-end home equipment reports CCM faults; and for CCM faults, notifying the state of normal receiving and transmitting of the CCM message of the home equipment to the peer-to-peer home equipment, so that the peer-to-peer home equipment displays the state of CCM faults which are not received by the peer-to-peer home equipment, and simultaneously displays the MEP state of the home equipment. The home equipment with normal AC MEP state in the scheme displays the local CCM receiving and sending state, the home equipment with abnormal AC MEP state displays the scheme of the AC MEP state of the opposite-end home equipment, and the service connectivity identification of the EVPN VPWS dual-home dual-activity scene can be accurately realized. The scheme is simple and reliable, and has important significance in practical application.
Description
Technical Field
The invention relates to the technical field of network communication, in particular to a method for identifying multi-activity service connectivity of VPWS.
Background
EVPN (Ethernet Virtual Private Network) is a VPN technology for two-layer network interconnection. The EVPN technology transfers the MAC address learning and publishing process between two-layer networks of different network stations from the data plane to the control plane through the extended BGP protocol. The EVPN VPWS (Virtual Private Wire Service, virtual private line service) is an L2VPN service scheme for providing P2P on the basis of an EVPN service architecture, the control layer adopts MP-BGP to announce EVPN route information, and the data layer adopts tunnel encapsulation. The data message of the user network is directly forwarded through the AC and PW under the cross connection, and the MAC forwarding table item is not required to be searched, so that the point-to-point two-layer service is provided for the user.
As shown in fig. 1, the typical network model of the EVPN VPWS includes the following parts.
CE (Customer Edge), customer network side device directly connected to the service provider network.
PE (Provider Edge), service Provider network side device connected to CE. The PE is mainly responsible for accessing the EVPN service, and mapping and forwarding of the message from the user network to the public network tunnel and from the public network tunnel to the user network are completed.
AC (Attachment Circuit, access circuit), physical or virtual circuits connecting CE and PE, e.g. Ethernet interface, VLAN, PPP connection over physical interface. The AC attributes include the encapsulation type, maximum transmission unit MTU, and interface parameters for the particular link type.
The PW (Pseudowire) is a virtual bi-directional connection between two PEs, consisting of a pair of unidirectional virtual connections in opposite directions. The EVPN VPWS simplifies the control and data model, takes BGP as a unified control plane, uses the routing and next hop iteration functions of BGP to select a backbone network traffic path, and does not need to manually specify PW.
A public network Tunnel (Tunnel), which traverses the IP or MPLS backbone, is used to carry PWs, one public network Tunnel may carry multiple PWs, and the public network Tunnel may be an MPLS Tunnel, a GRE Tunnel, or a SRv Tunnel.
Cross connect (Cross connect), a connection formed by connecting two physical circuits or virtual circuits in series, wherein a message received from one physical circuit or virtual circuit is directly exchanged to the other physical circuit or virtual circuit for forwarding, and the Cross connect comprises an AC-to-AC Cross connect and an AC-to-PW Cross connect.
EVPL instances, which are in one-to-one correspondence with ACs, each have a service ID. The EVPL instance of the home PE is also in one-to-one correspondence with the EVPL instance of the far PE. And constructing a forwarding table item by mutually sending EVPN routes with service IDs between PEs, and forwarding or receiving service traffic of different ESs, thereby realizing point-to-point interconnection.
EVPN-VPWS instance deployed on border PE, with common access or network side attribute service combination, BGP-EVPN address family passes routes based on RD, RT attributes configured in each instance.
As shown in FIG. 2, the influence of PE single-point faults on network service is avoided, the reliability of the network is improved, and the CE is connected to two PEs to form a redundant backup group, which is called EVPN VPWS dual-homing. When CEs are connected to multiple PEs through different Ethernet links, these links form an ES (Ethernet Segment) and are identified as belonging to the same ES by the same ESI (ES Identifier). The redundancy backup mode of EVPN VPWS dual homing has two networking scenes of dual homing single-homing and dual homing dual-homing.
In the dual-homing single-activity redundancy mode, only one of PE1 and PE2 forwards traffic, and two PW on PE1 and PE2 are in a main-standby relation, so that when the main PW fails, the traffic is immediately switched to the standby PW, and traffic forwarding is continued. The main and standby PW can be determined through DF election. When the PW of the PE1 is unavailable, the PE3 will enable the backup PW, and forward the message of the CE 2 to the PE2 through the backup PW, and then forward the message to the CE 1 from the PE2.
As shown in fig. 3, in the dual-homing multi-active redundancy mode, two PWs on PE3 form an equivalent load sharing forwarding data packet. The redundant mode is configured to be more active on PE1 and PE2, and the same ESI is configured on the access side interface, and both PE1 and PE2 are in the main DF state. After the forwarding association table entry is successfully established, the flow message sent from the AC port can be directly sent to the far-end PE by using the corresponding public network tunnel according to the forwarding association table entry of the tunnel and the EVPL instance. After the remote PE receives the flow message, the remote PE searches the forwarding association table entry according to the label packaged on the flow message and forwards the forwarding association table entry to the corresponding AC port. In the dual-homing multi-active networking of fig. 3, the redundancy mode between PE1 and PE2 is dual-active, and the configuration and BGP protocol message interaction flow under the scenario is as follows.
The EVPL instance and the EVPN-VPWS instance are configured on the respective PE devices, wherein the EVPL instance needs to be bound with the AC port and the EVPN-VPWS instance, respectively, and each EVPL instance needs to be configured with a local service ID and a remote service ID. After the configuration is completed, forwarding association table entries of the AC port and the EVPL instance are generated on the local PE. The redundancy modes are configured as multiple active on PE1 and PE2, and the same ESI is configured on the access side interface. The PE1 and the PE2 mutually send an ES route, and RD, RT, ESI and Source IP are carried on the ES route. After receiving the ES route, the DF elections will not be triggered between PE1 and PE2, and both devices will be in the primary DF state.
PE1 and PE2 send an ES AD route to PE3, carrying RD, RT, next hop and multiple Active mode information (All-Active). Each PE device sends an EVI AD Route to each other, where the EVI AD Route carries information such as RD, RT (Route-Target), next hop, local service ID, EVPL label or SRv SID, master role, etc. PE1 and PE2 receive the EVI AD route from PE3, match the RT cross to the corresponding EVPN-VPWS instance, and iterate the MPLS or SRv tunnel according to the next hop information, or iterate SRv tunnel according to SRv SID. If the check finds that the service ID on the received route is the same as the remote service ID configured on the local EVPL instance, then a forwarding association table entry for the MPLS or SRv/v 6 tunnel and the local EVPL instance is generated.
PE3 receives EVI AD routes from PE1 and PE2, crosses the matching RT to the corresponding EVPN-VPWS instance, and iterates the MPLS or SRv tunnel according to the next-hop information, or iterates the SRv tunnel according to the SRv SID. If the check finds that the service ID on the received route is the same as the remote service ID configured on the local EVPL instance, then a load sharing entry for the MPLS or SRv/v 6 tunnel and the local EVPL instance is generated. PE1 and PE2 receive EVI AD routes from the opposite end, match RT to the corresponding EVPN-VPWS instance, and iterate MPLS or SRv tunnels according to the next hop information, or iterate SRv tunnels according to SRv SIDs, respectively. If the check finds that the service ID on the received route is the same as the remote service ID configured on the local EVPL instance and the ESI is the same, then an associated BYPASS entry for the MPLS or SRv/v 6 tunnel and the local EVPL instance is generated.
As shown in fig. 4, after the configuration of the EVPN VPWS is completed, the connectivity of the configured service needs to be confirmed. The CCM mechanism defined by G.8013 is adopted to confirm the service connectivity conventionally, MEP entities are configured on the AC port, and the service connectivity is confirmed by periodically sending CCM message simulation service messages. In the EVPN VPWS dual-homing multi-activity scene, because the CCM message sent by the AC port of the PE3 is sent by the load sharing of PW, only PE1 or PE2 can receive the CCM message, so that one state of MEPs in PE1 and PE2 is fixed as DOWN, and the forwarding state of the real EVPN VPWS dual-homing cannot be reflected.
Disclosure of Invention
According to the embodiment of the invention, a method for identifying multi-lived service connectivity of VPWS is provided, which comprises the following steps:
creating an EVPN VPWS dual-homing dual-activity scene;
according to the double-activity routing rule, sending CCM (continuous message) messages of an AC (alternating current) port of network side equipment in a scene to home equipment in the scene, wherein the home equipment can normally send and receive the CCM messages;
the opposite terminal attribution equipment in the scene can not normally send and receive CCM messages, and the opposite terminal attribution equipment reports CCM faults;
for CCM faults, the home equipment informs the opposite-end home equipment of the state of CCM message normal receiving and transmitting of the home equipment, so that the opposite-end home equipment displays the state of CCM faults generated by the CCM message which is not received by the opposite-end home equipment, and simultaneously displays the MEP state of the home equipment.
Further, the CCM message of the AC port of the network side device is processed by the load sharing algorithm of PW ECMP and then sent to the home device.
Further, referring to ITU-T g.8013 protocol, when the home device of the opposite terminal cannot normally receive three continuous CCM messages sent by the AC port of the device, a CCM fault is reported.
Further, the normal receiving and transmitting state of CCM message of the home equipment is announced to the CCM message transmitting period of the network side equipment with the announcement period of the opposite-end home equipment being set to 3 times.
Further, if the opposite home equipment does not receive the MEP state sent by the home equipment in 3 times of continuous notification period, the MEP state of the home equipment is cleared.
Further, the state of normal receiving and transmitting of CCM message of the home equipment is announced to the home equipment of the opposite end according to the fixed time interval.
Further, the fixed time interval may be 1S, 2S, 3S, 5S, 10S.
According to the method for identifying the multi-activity service connectivity of the VPWS, the home equipment with the normal AC MEP state in the scheme displays the local CCM receiving and transmitting state, the home equipment with the abnormal AC MEP state displays the scheme of the AC MEP state of the home equipment at the opposite end, and the service connectivity identification of the dual-home dual-activity scene of the EVPN VPWS can be accurately realized. The scheme is simple and reliable, and has important significance in practical application.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and are intended to provide further explanation of the technology claimed.
Drawings
Fig. 1 is a block diagram of a typical network model of an EVPN VPWS in the prior art.
Fig. 2 is a schematic diagram of EVPN VPWS dual homing in the prior art.
Fig. 3 is a schematic diagram of EVPN VPWS dual homing dual active networking in the prior art.
Fig. 4 is a schematic diagram of EVPN VPWS dual homing dual active configuration g.8013 CCM in the prior art.
Fig. 5 is a schematic diagram of an EVPN VPWS dual-homing dual-activity CCM message Wen Shuang according to an embodiment of the present invention.
Fig. 6 is a schematic diagram of an MEP status notification message format according to an embodiment of the present invention.
Fig. 7 is a flowchart of a method for identifying VPWS multi-lived service connectivity according to an embodiment of the present invention.
Detailed Description
The preferred embodiments of the present invention will be described in detail below with reference to the attached drawings, which further illustrate the present invention.
Firstly, a method for identifying multi-activity service connectivity of VPWS according to an embodiment of the present invention will be described with reference to fig. 5 to 7, which is used for confirming connectivity in EVPN VPWS dual-homing dual-activity scenario by using CCM mechanism of g.8013, and its application scenario is wide.
As shown in fig. 5 to 7, the method for identifying VPWS multi-active service connectivity according to the embodiment of the present invention includes the following steps:
as shown in fig. 5 and 7, in S1, an EVPN VPWS dual homing dual alive scenario is created.
As shown in fig. 7, in S2, according to the dual-activity routing rule, a CCM message of an AC port of a network side device PE3 in a scene is sent to a home device PE1 in the scene, and the home device PE1 can normally send and receive the CCM message. In this embodiment, the CCM message of the AC port of the network side device PE3 is processed by the load sharing algorithm of PW ECMP, and then sent to the home device PE1. So CCM message between the home equipment PE1 and the network side equipment PE3 is normally received and sent, MEPs can normally find each other, and the normal service can be verified.
As shown in fig. 7, in S3, the peer home device PE2 in the scenario cannot normally send and receive CCM messages, and reports a CCM failure.
As shown in fig. 7, in S4, for the problem of CCM failure reported by the home equipment PE2 at the opposite end, the state of normal sending and receiving of the CCM message of the home equipment PE1 is announced to the home equipment PE2 at the opposite end by the predefined communication message format, so that the home equipment PE2 at the opposite end displays the state that the CCM message is not received by itself and displays the MEP state of the home equipment PE1. In this embodiment, an announcement scheme of the MEP status is: CCM message receives and transmits normal home equipment PE1 to rapidly synchronize MEP state to opposite home equipment PE2. Referring to the ITU-T G.8013 protocol, when the opposite terminal attribution equipment PE2 cannot normally receive three continuous CCM messages sent by the AC port of the network side equipment PE3, the CCM fault is reported. The CCM message sending period of the network side equipment PE3, which is set to be 3 times as long as the notification period of the opposite-end home equipment PE2, is notified to the CCM message of the home equipment PE1 in a normal receiving and transmitting state, and the MEP state can be timely given to the opposite-end home equipment PE2. Another MEP state advertising scheme is: the normal receiving and transmitting state of the CCM message of the home equipment PE1 is announced to the opposite-end home equipment PE2 according to a fixed time interval, wherein the fixed time interval can be 1S, 2S, 3S, 5S, 10S and the like. The scheme with fixed time interval can reduce the number of state synchronization messages and reduce the occupation of message MEP state synchronization mechanism to the resources of the home equipment.
Further, if the opposite home equipment PE2 does not receive the MEP status sent by the home equipment PE1 in 3 consecutive times of the notification period, the MEP status of the home equipment PE1 is cleared.
According to the ITU-T g.8013 protocol, the MEP is the body for sending and receiving CCM messages, and the MEP has an index (Level, megId, mepId). The message format of the special message for the MEP status synchronization is shown in fig. 6, and fig. 6 is applicable to the above-mentioned fast notification MEP status scheme and timing notification MEP status scheme between dual homing devices. The DMAC and SMAC may use preset MAC addresses for identifying MEP status synchronized messages. And the dual-home dual-active home equipment sends ACL rule matching message and sends the message to the AC MEP for processing. After the AC MEP receives the MEP state message sent by the opposite-end home equipment, the MEP state is analyzed and processed for local MEP state presentation.
Above, the method for identifying multi-activity service connectivity of VPWS according to the embodiment of the present invention is described with reference to fig. 5 to 7, in which the home device with normal AC MEP state displays the local CCM receiving and sending state, and the home device with abnormal AC MEP state displays the scheme of AC MEP state of the home device at the opposite end, so that service connectivity identification of dual-home dual-activity scene of EVPN VPWS can be accurately implemented. The scheme is simple and reliable, and has important significance in practical application.
It should be noted that in this specification the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising … …" does not exclude the presence of additional identical elements in a process, method, article, or apparatus that comprises an element.
While the present invention has been described in detail through the foregoing description of the preferred embodiment, it should be understood that the foregoing description is not to be considered as limiting the invention. Many modifications and substitutions of the present invention will become apparent to those of ordinary skill in the art upon reading the foregoing. Accordingly, the scope of the invention should be limited only by the attached claims.
Claims (7)
1. The method for identifying the multi-activity service connectivity of the VPWS is characterized by comprising the following steps of:
creating an EVPN VPWS dual-homing dual-activity scene;
according to the dual-activity routing rule, sending a CCM message of an AC port of network side equipment PE3 in the scene to home equipment PE1 in the scene;
the opposite terminal attribution equipment PE2 in the scene can not normally send and receive CCM messages, and the opposite terminal attribution equipment PE2 reports CCM faults;
for the CCM fault, the home equipment PE1 informs the opposite-end home equipment PE2 of the state of normal receiving and transmitting of the CCM message of the home equipment PE1, and the opposite-end home equipment PE2 displays the fault state of the CCM message and displays the MEP state of the home equipment PE1.
2. The method for identifying service connectivity of VPWS multiple activities according to claim 1, wherein the CCM message of the AC port of the network side device PE3 is sent to the home device PE1 after being processed by a load sharing algorithm of PW ECMP.
3. The method for identifying service connectivity for multiple activities of VPWS according to claim 1, wherein, referring to ITU-T g.8013 protocol, when the peer home equipment PE2 cannot normally receive three continuous CCM messages sent by the AC port of the network side equipment PE3, a CCM fault is reported.
4. The method for identifying service connectivity with multiple VPWS activities according to claim 3, wherein a state of normal sending and receiving of CCM messages of the home device PE1 is announced to the opposite home device PE2, and a period of announcement of the opposite home device PE2 is set to 3 times a period of CCM message sending of the network side device PE 3.
5. The method for recognizing multi-active service connectivity according to claim 4, wherein if the MEP state sent by the home equipment PE1 is not received by the peer home equipment PE2 for 3 times of continuous notification period, the MEP state of the home equipment PE1 is cleared.
6. The method for identifying service connectivity of VPWS multiple activities according to claim 1, wherein the state of normal CCM message sending and receiving of the home equipment PE1 is announced to the peer home equipment PE2 at fixed time intervals.
7. The method for recognizing VPWS multi-active traffic connectivity according to claim 6, wherein the fixed time interval is 1S, 2S, 3S, 5S, 10S.
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