CN103457817A - PW+L3VPN protection method and system - Google Patents
PW+L3VPN protection method and system Download PDFInfo
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Abstract
The invention discloses a PW+L3VPN protection method and system. The method includes: configuring master and standby PWs (pseudo-wires) of single-emission and single-receiving to an access node, and terminating the master and standby PWs to two layer 3 gateway nodes; allowing the access node to transmit ARP (address resolution protocol) information and route information to the two layer 3 gateway nodes, announcing the ARP information and route information in the L3VPN domain through the layer three gateway nodes; allowing the nodes to configure own forwarding statuses according to the ARP information and route information, and forwarding uplink and downlink flows according to the forwarding statuses; in case of network failure, allowing the failure-affected nodes to change the forwarding statuses, and correspondingly forwarding the uplink and downlink flows according to the post-changing forwarding statuses. The method and system has the advantages that switching speed is high, the network can be more robust, operation and maintenance is easier, configuring VRRP on the layer three gateway nodes is not required, and the problem of double masters in the VRRP is avoided.
Description
Technical field
The present invention relates to the bearing technology field of existing network business, relate in particular to guard method and the system of a kind of PW+L3VPN.
Background technology
At present, the based Carrying Scheme of existing network business mainly comprises two main flow schemes, respectively pseudo-line (PW, Pseudo Wire)+tri-layer (L3) VPN (virtual private network) (VPN, Virtual Private Network) based Carrying Scheme and customer edge (CE, Customer Edge)+L3VPN based Carrying Scheme.So-called existing network business, refer to the business of current network.
Wherein, the PW+L3VPN based Carrying Scheme as shown in Figure 1, in the network shown in fig. 1, the access ring be comprised of A node (access node) is articulated on two B nodes, a core of the common composition of these equipment that the B node is above, base station controller (BSC, Base Station Controller)/IAD (aGW) is following converges ring.When disposing the PW+L3VPN based Carrying Scheme, the A node on access ring is to disposing the PW business between the B node, and the B node is above, the network design L3VPN business below BSC/aGW, and these two B nodes are gateway nodes.From base station, (BTS/eNB) divides three sections carryings to BSC/aGW to business, from the A node of base station access, to the B node, is first paragraph, by the PW service bearer; From the B node to CE, be second segment, by the L3VPN service bearer; Be the 3rd section from CE to BSC/aGW, usually adopt the IP carrying.
In specific implementation process, the PW+L3VPN based Carrying Scheme adopts a series of redundancy protecting mechanism: the A node is established to respectively the redundancy PW of two B nodes, and B node termination PW also enters the L3VPN that converges core layer; Two B nodes close as three-layer network respectively, and the two gateway protections to business are provided.
At present, the PW+L3VPN based Carrying Scheme has two kinds of gateway protection mechanisms usually:
Mechanism one is, by the interlock of A node and B node, under the scene that does not start Virtual Router Redundancy Protocol (VRRP, Virtual Router Redundancy Protocol), to realize switching fast of L3VPN active/standby gateway;
Mechanism two is, by the internodal VRRP of B, to realize switching fast of L3VPN active/standby gateway.
Wherein, the detailed process of mechanism one is as shown in Figure 2:
A node configuration preference level is identified master-slave redundancy PW, and this redundancy PW terminates in respectively two converging on L3VPN VRF (Virtual Routing Forwarding, virtual routing forwarding) the three straton interfaces of B1 or B2; The status bit messages such as Active/Standby (active/standby) that the A node carries PW send to B node (following draft-ietf-pwe3-redundancy/draft-ietf-pwe3-redundancy-bi t standard);
The identical IP address of L3VPN VRF tri-straton interface configuration of B1 and B2, by identification PWActive/Standby status bit message, the three straton interfaces of termination Active PW will be in the UP state, and the relevant route of issue; Simultaneously, the three straton interfaces of termination standby PW will be in the Down state, and relevant route can not issued.And then avoid the inconsistent situation of uplink and downlink flow path to occur.
Mechanism two detailed process is as shown in Figure 3:
The A node configures the L3VPN that active and standby PW is linked into the B node, PW terminate B1 and B2; Three straton interface configuration VRRP corresponding to active and standby PW on the B node, form the VRRP backup group; Base station network segment route is upwards issued in the B node configuration of active and standby PW access;
Upwards issue the priority difference of router by master/backup (active/standby) router in configuration B node VRRP group, can realize that the single-shot list of PW is received or single-emission and double-receiving;
The VRRP signaling flow requires exchanging between B-B or on core layer, need to avoid being undertaken alternately by the A node.
For above-mentioned mechanism one, on the B node, PW and three layer interfaces must be man-to-man, and a plurality of PW can not share same three layer interfaces on the B node, be that any one PW on the A node needs to take three layer interfaces on the B node, for existing network, implement to bring larger restriction; And, losing efficacy while occurring, the B node need to switch according to the PW status bit message of A node announcement UP/DOWN state the relevant route of announcement of corresponding interface, and Comparatively speaking, switch speed is slow, is difficult to meet the performance requirement of protection switching in existing network 50ms; In addition, this signaling interlock mode requires the B node to support PW-Redundancy (redundancy) mechanism, and the coupling of A node and B node is strong, exists across producer's intercommunication problem at present.
For above-mentioned mechanism two, if link failure between two B nodes of VRRP group, there will be the two main situations of VRRP, can't interaction mode information between two B nodes, can two B nodes all be set to master state simultaneously, and the PW on the A node is single-shot list receipts, therefore there will be the obstructed situation of downlink traffic (BSC/aGW is to the flow of BTS/eNB) in a period of time.
In sum, all there are some problems in the enforcement mechanism of two kinds of PW+L3VPN protection schemes commonly used at present, need to make improvements.
Summary of the invention
In view of this; main purpose of the present invention is to provide guard method and the system of a kind of PW+L3VPN; long to solve the protection switch time that existing PW+L3VPN protection scheme exists, and easily occur during the link failure between gateway node pair primary and cause the obstructed problem of downlink traffic.
For achieving the above object, technical scheme of the present invention is achieved in that
The invention provides the guard method of a kind of PW+L3VPN, be applied to the existing network service bearer of PW+L3VPN, the method comprises:
The active and standby pseudo-line PW of configuration single-emission and double-receiving attribute on access node, described active and standby PW two the three-layer network artiss that terminate;
Described access node sends ARP information and routing iinformation by active and standby PW to described two three-layer network artiss, and described ARP information and routing iinformation are announced in three-layer virtual special network L3VPN territory via described three-layer network artis;
Each node configures the forwarding state of self according to described ARP information and routing iinformation, and according to described forwarding state, the uplink and downlink flow is carried out respectively to the correspondence forwarding;
When network failure, converted by the forwarding state of the node of fault effects, and according to the forwarding state after conversion, the uplink and downlink flow is carried out respectively to the correspondence forwarding.
Preferably, the method also comprises:
On described two three-layer network artiss, for two three layer interfaces of the active and standby PW that terminates configure identical IP address and media access control MAC address.
Preferably, according to described forwarding state, the uplink and downlink flow is carried out respectively to correspondence and forwards, comprising:
On up direction, access node is according to the state of active and standby PW, if main PW state is normal, along main PW, sends uplink traffic to corresponding three-layer network artis, otherwise, send uplink traffic to corresponding three-layer network artis along standby PW; The three-layer network artis is carried out corresponding three layers of forward process according to the forwarding state of self to uplink traffic;
On down direction, receive the three-layer network artis PW corresponding according to the IP/MAC information searching of message in flow of downlink traffic, and transmit downlink traffic to access node along the PW found.
Preferably, described access node without the active and standby information that sends PW to described three-layer network artis.
The present invention also provides the protection system of a kind of PW+L3VPN, is applied to the existing network service bearer of PW+L3VPN, and this system comprises:
Configuration module, for the active and standby pseudo-line PW of configuration single-emission and double-receiving attribute on access node, described active and standby PW two the three-layer network artiss that terminate;
Information sends control module, send ARP information and routing iinformation by active and standby PW to described two three-layer network artiss for controlling access node, described ARP information and routing iinformation are announced in three-layer virtual special network L3VPN territory via described three-layer network artis;
The traffic forwarding module, for controlling the forwarding state of each node according to described ARP information and routing iinformation configuration self, and carry out respectively the correspondence forwarding according to described forwarding state to the uplink and downlink flow;
Fault processing module, for when the network failure, converted the forwarding state of the node that is subject to fault effects, and control node, according to the forwarding state after conversion, the uplink and downlink flow is carried out respectively to correspondence forwarding.
Preferably, described configuration module also for, on described two three-layer network artiss, for two three layer interfaces of the active and standby PW that terminates configure identical IP address and media access control MAC address.
Preferably, described traffic forwarding module also for,
On up direction, control the state of access node according to active and standby PW, if main PW state is normal, along main PW, send uplink traffic to corresponding three-layer network artis, otherwise, send uplink traffic to corresponding three-layer network artis along standby PW; The three-layer network artis is carried out corresponding three layers of forward process according to the forwarding state of self to uplink traffic;
On down direction, control the three-layer network artis PW corresponding according to the IP/MAC information searching of message in flow that receives downlink traffic, and transmit downlink traffic to access node along the PW found.
Preferably, described information send control module also for, control access node and do not send the active and standby information of PW to described three-layer network artis.
The guard method of a kind of PW+L3VPN provided by the present invention and system, can realize that the gateway protection in 50ms is switched; Active and standby PW, without being linked with routing mechanism, has realized the loose coupling of access node and three-layer network artis, and switch speed is fast, is conducive to promote the robustness of network, reduces the O&M complexity; Need on the three-layer network artis, not configure VRRP, can not occur in the two main problems of the VRRP there will be in the mechanism two of background technology; Can share same three layer interfaces for the PW of a plurality of access nodes on the three-layer network artis, facilitate existing network to dispose.
The accompanying drawing explanation
Fig. 1 is the schematic diagram of existing PW+L3VPN based Carrying Scheme;
Fig. 2 is the schematic diagram of the protection mechanism of existing a kind of PW+L3VPN;
Fig. 3 is the schematic diagram of the protection mechanism of existing another kind of PW+L3VPN;
The flow chart of the guard method of a kind of PW+L3VPN that Fig. 4 is the embodiment of the present invention;
The schematic diagram of the protection of a kind of PW+L3VPN that Fig. 5 is the embodiment of the present invention;
Fig. 6 be the embodiment of the present invention at network under normal circumstances, the flow that is deployed with the PW+L3VPN protection mechanism of non-interlock transmits schematic diagram;
Fig. 7 be the embodiment of the present invention when link breaks down, be deployed with the flow switch schematic diagram of the PW+L3VPN protection mechanism of non-interlock;
Fig. 8 be the embodiment of the present invention when node breaks down, be deployed with the flow switch schematic diagram of the PW+L3VPN protection mechanism of non-interlock;
The structural representation of the protection system of a kind of PW+L3VPN that Fig. 9 is the embodiment of the present invention.
Embodiment
Below in conjunction with the drawings and specific embodiments, the technical solution of the present invention is further elaborated.
The guard method of a kind of PW+L3VPN that the embodiment of the present invention provides, be applied to the existing network service bearer of PW+L3VPN, and as shown in Figure 4, the method mainly comprises following flow process:
So-called single-emission and double-receiving attribute, refer on one direction and send, receive on twocouese, and the current PW in use could transmitted traffic, but can receive flow at active and standby PW.
On described two three-layer network artiss, for two three layer interfaces of the active and standby PW that terminates configure identical IP address and media access control (MAC) address.
Access node without the active and standby information that sends PW to the three-layer network artis.
On up direction, access node is according to the state of active and standby PW, if main PW state is normal, along main PW, sends uplink traffic to corresponding three-layer network artis, otherwise, send uplink traffic to corresponding three-layer network artis along standby PW; The three-layer network artis is carried out corresponding three layers of forward process according to the forwarding state of self to uplink traffic;
On down direction, receive the three-layer network artis PW corresponding according to the IP/MAC information searching of message in flow of downlink traffic, and transmit downlink traffic to access node along the PW found.
Take the network configuration shown in Fig. 5 as example, the PW+L3VPN protection mechanism of the non-interlock that the embodiment of the present invention proposes is: terminate the respectively L3VPN of B1 and B2 node of the two PW of A node configuration, configure same three layer interfaces by B1 and B2 node, to L3VPN, issue base station network segment detail and gather routing iinformation; The two PW of A node keep the single-emission and double-receiving states, and redundancy PW is without the active and standby information of carrying PW to the B node, and active and standby PW does not need and the routing mechanism interlock, thus realize A and the loose coupling of B node interconnected.Base station upwards initiatively sends ARP information (active and standby PW sends out) by the PW between A and B, the B node obtains base station route and ARP information, because PW is two receipts character, so downlink traffic (being the flow of BSC/aGW to BTS/eNB) can receive on active and standby PW.
In the network configuration shown in Fig. 5,
Below further set forth the PW+L3VPN protection mechanism of the embodiment of the present invention in conjunction with Fig. 6～8 again.
In network as shown in Figure 6, the base station that address is 10.1.1.2 is linked into the A1 node, and A1 sets up two PW to B1, B2 respectively, and specifying A1 is primary PW to the PW1 of B1, and A1 is standby PW to the PW2 of B2; And configure the single-emission and double-receiving attribute of this two PW and the two attributes of sending out of ARP; On B1 and B2 node, be identical IP and the MAC Address of two interface configuration of termination PW1 and PW2; And carry out the configuration of some other routine; such as access ring and core converge IGP multizone on ring, dispose, the upper main PW of A1 carries label switched path (LSP; Label Switching Path) protection LSP on configuration, core converge that BGP configuration, the BFD based on LSP/PW on ring detects, multiple cases link aggregation (MC-LAG, Multi-Chassis Link Aggregation Group) but, the arrangement such as VPN FRR.
After above-mentioned configuration, the ARP information of this base station and routing iinformation can be sent to respectively on B1 and B2 node via PW1 and PW2, and converged in core by these two B nodes on the L3VPN territory of ring and announce, to the downlink traffic of this base station, can at any time correctly be forwarded to the A1 node of Access Layer.
In the normal situation of network, flow between this base station and BSC/aGW transmits route as shown in the double arrowed line in Fig. 6, while being the uplink traffic transmission, be sent to the B1 node along primary PW on the A1 node, terminate this data select corresponding three layers of forwarding channel for it of B1 node, it is forwarded to CE1, and then is forwarded on BSC/aGW; When downlink traffic transmits, BSC/aGW selects, through CE1, flow is sent to the B1 node according to the configurations such as MC-LAG that may exist, and B1 is forwarded to A1 node by it along PW1 according to local routing information.
If the A1 node breaks down to the link between the B1 node; if be deployed with before in this case the protection on PW1 carrying LSP; the uplink and downlink flow only transmits and gets final product with the protection switching of carrying out the LSP aspect; be that the perception of PW aspect is less than this fault; flow between A1 node and B1 node transmits along A1---B2---B1, and other internodal flows are still transmitted along original path.After the protection switching, the flow between base station and BSC/aGW transmits route as shown in the double arrowed line in Fig. 7.
If primary gateway B1 node breaks down, by certain Operations,Administration And Maintenance (OAM, Operations Administration and Maintenance)/BFD testing mechanism, A1 and CE1 node perceive respectively this fault message, carry out corresponding flow switch and process.On the A1 node, the uplink traffic of BSC/aGW to be sent to is switched on standby PW2 and is transmitted, the B2 node is selected corresponding transfer path according to three layers of bgp routing information on this node again; And, in the downlink traffic transport process, CE1 selects, through CE2, flow is sent to the B2 node, the B2 node is forwarded to A1 node by flow along PW2 according to local routing information.After the protection switching, the flow between base station and BSC/aGW transmits route as shown in the double arrowed line in Fig. 8.
The PW+L3VPN protection of the non-interlock that the embodiment of the present invention proposes need to not configure VRRP on the B node, can not occur in the two main problems of the VRRP there will be in mechanism two; And do not need to carry out the interlock of PW main and backup status and routing iinformation, switch speed is fast, the coupling of the access node of base station and three-layer network artis is low, is conducive to promote the robustness of network, reduces the O&M complexity.
The guard method of corresponding above-mentioned PW+L3VPN, the embodiment of the present invention also provides the protection system of a kind of PW+L3VPN, and as shown in Figure 9, this system comprises: configuration module 10, information send control module 20, traffic forwarding module 30 and fault processing module 40.
Wherein, configuration module 10, for the active and standby PW of configuration single-emission and double-receiving attribute on access node, described active and standby PW two the three-layer network artiss that terminate;
Information sends control module 20, for controlling access node, by active and standby PW, to described two three-layer network artiss, sends ARP information and routing iinformation, and described ARP information and routing iinformation are announced in the L3VPN territory via described three-layer network artis;
Preferably, configuration module 10 also for, on described two three-layer network artiss, for two three layer interfaces of the active and standby PW that terminates configure identical IP address and MAC Address.
Preferably, traffic forwarding module 30 also for,
On up direction, control the state of access node according to active and standby PW, if main PW state is normal, along main PW, send uplink traffic to corresponding three-layer network artis, otherwise, send uplink traffic to corresponding three-layer network artis along standby PW; The three-layer network artis is carried out corresponding three layers of forward process according to the forwarding state of self to uplink traffic;
On down direction, control the three-layer network artis PW corresponding according to the IP/MAC information searching of message in flow that receives downlink traffic, and transmit downlink traffic to access node along the PW found.
Preferably, information send control module 20 also for, control access node and do not send the active and standby information of PW to described three-layer network artis.
The above, be only preferred embodiment of the present invention, is not intended to limit protection scope of the present invention.
Claims (8)
1. the guard method of a PW+L3VPN, be applied to the existing network service bearer of PW+L3VPN, it is characterized in that, the method comprises:
The active and standby pseudo-line PW of configuration single-emission and double-receiving attribute on access node, described active and standby PW two the three-layer network artiss that terminate;
Described access node sends ARP information and routing iinformation by active and standby PW to described two three-layer network artiss, and described ARP information and routing iinformation are announced in three-layer virtual special network L3VPN territory via described three-layer network artis;
Each node configures the forwarding state of self according to described ARP information and routing iinformation, and according to described forwarding state, the uplink and downlink flow is carried out respectively to the correspondence forwarding;
When network failure, converted by the forwarding state of the node of fault effects, and according to the forwarding state after conversion, the uplink and downlink flow is carried out respectively to the correspondence forwarding.
2. the guard method of PW+L3VPN according to claim 1, is characterized in that, the method also comprises:
On described two three-layer network artiss, for two three layer interfaces of the active and standby PW that terminates configure identical IP address and media access control MAC address.
3. the guard method of PW+L3VPN according to claim 1, is characterized in that, according to described forwarding state, the uplink and downlink flow carried out respectively to correspondence and forward, and comprising:
On up direction, access node is according to the state of active and standby PW, if main PW state is normal, along main PW, sends uplink traffic to corresponding three-layer network artis, otherwise, send uplink traffic to corresponding three-layer network artis along standby PW; The three-layer network artis is carried out corresponding three layers of forward process according to the forwarding state of self to uplink traffic;
On down direction, receive the three-layer network artis PW corresponding according to the IP/MAC information searching of message in flow of downlink traffic, and transmit downlink traffic to access node along the PW found.
4. according to the guard method of claim 1,2 or 3 described PW+L3VPN, it is characterized in that, described access node without the active and standby information that sends PW to described three-layer network artis.
5. the protection system of a PW+L3VPN, be applied to the existing network service bearer of PW+L3VPN, it is characterized in that, this system comprises:
Configuration module, for the active and standby pseudo-line PW of configuration single-emission and double-receiving attribute on access node, described active and standby PW two the three-layer network artiss that terminate;
Information sends control module, send ARP information and routing iinformation by active and standby PW to described two three-layer network artiss for controlling access node, described ARP information and routing iinformation are announced in three-layer virtual special network L3VPN territory via described three-layer network artis;
The traffic forwarding module, for controlling the forwarding state of each node according to described ARP information and routing iinformation configuration self, and carry out respectively the correspondence forwarding according to described forwarding state to the uplink and downlink flow;
Fault processing module, for when the network failure, converted the forwarding state of the node that is subject to fault effects, and control node, according to the forwarding state after conversion, the uplink and downlink flow is carried out respectively to correspondence forwarding.
6. the protection system of PW+L3VPN according to claim 5; it is characterized in that; described configuration module also for, on described two three-layer network artiss, for two three layer interfaces of the active and standby PW that terminates configure identical IP address and media access control MAC address.
7. the protection system of PW+L3VPN according to claim 5, is characterized in that, described traffic forwarding module also for,
On up direction, control the state of access node according to active and standby PW, if main PW state is normal, along main PW, send uplink traffic to corresponding three-layer network artis, otherwise, send uplink traffic to corresponding three-layer network artis along standby PW; The three-layer network artis is carried out corresponding three layers of forward process according to the forwarding state of self to uplink traffic;
On down direction, control the three-layer network artis PW corresponding according to the IP/MAC information searching of message in flow that receives downlink traffic, and transmit downlink traffic to access node along the PW found.
8. according to the protection system of claim 5,6 or 7 described PW+L3VPN, it is characterized in that, described information send control module also for, control access node and do not send the active and standby information of PW to described three-layer network artis.
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| CN114124670A (en) * | 2021-11-03 | 2022-03-01 | 中盈优创资讯科技有限公司 | STN network equipment port migration method and device |
| EP4325799A1 (en) * | 2022-08-17 | 2024-02-21 | Huawei Technologies Co., Ltd. | Data transmission method, communication system, and route advertisement method |
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| CN103457817B (en) | 2018-03-16 |
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