CN108337144A - The metropolitan areas TD-LTE return network, path protecting method - Google Patents
The metropolitan areas TD-LTE return network, path protecting method Download PDFInfo
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- CN108337144A CN108337144A CN201710046609.6A CN201710046609A CN108337144A CN 108337144 A CN108337144 A CN 108337144A CN 201710046609 A CN201710046609 A CN 201710046609A CN 108337144 A CN108337144 A CN 108337144A
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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]
- H04L12/42—Loop networks
- H04L12/437—Ring fault isolation or reconfiguration
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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
- H04L12/4633—Interconnection of networks using encapsulation techniques, e.g. tunneling
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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
- H04L12/4637—Interconnected ring systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L47/00—Traffic control in data switching networks
- H04L47/10—Flow control; Congestion control
- H04L47/12—Avoiding congestion; Recovering from congestion
- H04L47/125—Avoiding congestion; Recovering from congestion by balancing the load, e.g. traffic engineering
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Abstract
The present invention relates to a kind of TD LTE metropolitan area return networks and path protecting methods; the network is each equipped with tunnel links group in the hollow networking being made of active and standby L2/L3 bridging devices node, primary L3 device nodes and spare L3 device nodes between two neighboring node; it can be transmitted with the flow between sharing nodes, realize bandwidth dilatation；In addition; between two neighboring node 2 looped networks are configured with by two physical links; it is also configured with 4 looped networks between two neighboring active and standby L2/L3 bridging devices node in hollow networking; when the setting of these looped networks so that some network elements or both links break down wherein; other standby network elements can be used or be transmitted to destination node by other Protection paths; the phenomenon that avoiding the occurrence of the flow blocking of Metropolitan Area Network (MAN) LTE PTN carryings, to effectively improve the stability of the metropolitan areas TD LTE return network.
Description
Technical field
The present embodiments relate to mobile communication technology fields, and in particular to a kind of metropolitan areas TD-LTE return network, path
Guard method.
Background technology
Existing LTE passback net is built based on PTN, TD-LTE transmission nets networking structure and discharge model as shown in Figure 1,
BTS service enters metropolitan area PTN network by accessing PTN, and core node is converged to metropolitan area L3 core nodes, then by L2/L3
L3VPN through saving dry PTN system is sent to the MME and SGW of core net.Normal condition, all LTE service traffics, webmaster flow rate
It is primary saved to do L3-1 and be back to provincial capital over long distances by districts and cities complex building L3-1 to districts and cities complex buildings dispatch L3-1 equipment, it is final to return
Reach EPC core nets.
Wireless traffic is by accessing PTN to deployment MC-PW APS carrying protections between convergence core PTN, dual homed to convergence
Core L2/L3 device nodes.Active/standby convergence core PTN nodes are terminated 2 layers by L2VE, and enter static metropolitan area by L3VE
L3VPN.Local network LTE PTN core layers and the function of saving dried layer realization L3, local network core layer L2/L3 equipment and L3 equipment groups
At " square shape " structure, L3VPN networks are realized, carry out L3 forwardings.It saves the dry L3VPN with districts and cities and then uses Native IP modes
Connection.The protection of Metropolitan Area Transmission Network core layer L3VPN levels passes through tunnel Tunnel 1:1 and VPN FRR (Fast ReRoute,
Quick heavy-route) it realizes, Tunnel APS are used to protect the tunnel path between node, and VPN FRR are for protecting L3VPN networks
Inner link and device node failure.And province does between the L3VPN of districts and cities and the Native IP of L3 PTN devices and EPC
Service interfacing protected mode is IP, VPN mixing FRR protections.
Metropolitan Area Transmission Network LTE PTN core layers network element (L2/L3 device nodes and L3 device nodes) is PE level network elements,
Static state L3VPN networkings are used between PE, form static L3VPN neighborhoods, PTN network L3VPN is using active/standby mode by LTE's
S1 interface flows are carried between the shorter PE in path on neighbours.When PE equipment detects that primary plane neighbours are interrupted, pass through VPN
Flow is switched on the L3VPN neighbours of another spare plane and carries by FRR fast route convergences, and industry is carried to it to realize
The protection of business.
Through investigating multiple provinces TD-LTE fault conditions in 2015, because transmission local network core layer failure causes LTE bases
The significant trouble blocked of standing has a lot of, is related to multiple districts and cities' Metropolitan Area Network (MAN)s, multiple plant equipments, averagely lasts more than 1 hour, this
Hidden danger is constituted to the stable operation of network, there is an urgent need to be optimized by Metropolitan Area Transmission Network optimization, to realize to LTE industry
The protection of business.
However, inventor has found during realizing the embodiment of the present invention, shape between L2/L3 bridging devices and L3 equipment
At hollow networking.A 10GE link is only disposed between two L2/L3 bridging devices and active and standby L3 equipment.Existing wet end administration
Traditional static L3VPN networkings can realize the service protection of any link or network element Single Point of Faliure in PTN network.But multiple spot is simultaneously
Network protection scarce capacity under the complex scenes such as failure, network robustness is poor, and there are the hidden danger that districts and cities' LTE business will hinder entirely.
Concrete analysis is as follows：
Fig. 2 is the typical networking structure figure of Metropolitan Area Transmission Network LTE PTN core layers, by link and network element between PTN network elements
Equipment is numbered with number 1 to 12 respectively.
It is analyzed below with the scene of 2 simultaneous faults, following 14 kinds of scenes can cause business to block, i.e., can cause
The S1 interface business of the base stations districts and cities eNodeB of Metropolitan Area Transmission Network carrying to EPC core nets blocks.
1 14 kinds of business of table block scene
| Serial number | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
| Scene (simultaneous faults) | (1)(3) | (1)(11) | (1)(12) | (2)(7) | (2)(10) | (2)(12) | (3)(4) |
| It influences | Full resistance | Full resistance | Full resistance | Full resistance | Full resistance | Full resistance | Full resistance |
| Serial number | 8 | 9 | 10 | 11 | 12 | 13 | 14 |
| Scene (simultaneous faults) | (3)(5) | (4)(7) | (4)(9) | (4)(10) | (4)(11) | (5)(10) | (7)(8) |
| It influences | Full resistance | Full resistance | Full resistance | Full resistance | Full resistance | Full resistance | Full resistance |
According to the statistical analysis of table 1, above-mentioned 14 kinds of scenes can cause the active and standby L3VPN neighbours Peer of PE network elements to interrupt, PTN
The LTE business of the network carrying blocks.The limitation of the networking model and guard method now netted, which results in static L3VPN networkings, to be existed
Above-mentioned problem, and PTN network element performances are limited to, Metropolitan Area Network (MAN) PTN network elements do not have dynamic routing networking capability.
Invention content
It is existing to overcome an embodiment of the present invention provides a kind of metropolitan areas TD-LTE return network, path protecting method
Networking model can lead to the defect that the whole network blocks at link or network element device are there are two when simultaneous faults.
In a first aspect, the present invention provides a kind of metropolitan areas TD-LTE return networks, including：By primary L2/L3 bridging devices
The hollow networking of node, spare L2/L3 bridging devices node, primary L3 device nodes and spare L3 device nodes composition；
Wherein, tunnel links group, each chain for tunnel are each equipped between any two node in the hollow networking
Lu Zuzhong includes a plurality of tunnel links；Each tunnel links group source, place only configure a routing, and will be in traffic sharing to group
It is transmitted to another node in several tunnel links；
Between primary L2/L3 bridging devices node and spare L2/L3 bridging devices node in the hollow networking
4 looped networks are also configured with, 4 looped networks are configured as being directly connected to primary L2/L3 bridging devices node, spare L2/L3
Bridging device node, primary L3 device nodes, spare L3 device nodes；Primary L2/L3 bridging devices node and spare L2/L3 bridges
It connects and is configured with protecting tunnel group between device node, the wherein operating path in tunnel binds above-mentioned 4 looped networks, the looped network in tunnel
Path be by primary L2/L3 bridging devices node, primary L3 device nodes and spare L3 device nodes described in approach, most
Zhongdao reaches the path of spare L2/L3 bridging devices node；
2 looped networks are configured with by two physical links between two neighboring node in the hollow networking, it is described
2 looped networks are configured as including the opposite loop of both direction, another by loop in the one of direction failure of loop
Transmit flow in a direction.
Optionally, the chain for tunnel way that each tunnel links group includes meets two nodes of the tunnel links group connection
Flow transmission bandwidth demand.
Optionally, it is greater than or equal to this for sharing and transmitting the activation chain for tunnel way of flow in each tunnel links group
The half for the chain for tunnel way for including in tunnel links group.
Optionally, the tunnel links in each tunnel links group in addition to the activation tunnel links are configured as protection chain
Road, the protection link continue to share and transmit the activation tunnel links and want when the activation tunnel links break down
The flow of transmission.
Optionally, the primary L3 device nodes, spare L3 device nodes do primary L3 device nodes and province with province respectively
It is configured with aggregated links between dry spare L3 device nodes；The polymeric chain of the primary L3 device nodes, spare L3 device nodes
The minimum activity chain way on road is configured as asymmetry value.
Optionally, the minimum activity chain way of the aggregated links of the primary L3 device nodes is total physical link member
Number, the minimum activity chain way of the aggregated links of spare L3 device nodes are the half of total physical link number of members.
Optionally, active and standby L2/L3 bridging devices node, primary L3 device nodes and the spare L3 device nodes
In each node be configured as the first line of a couplet port of setting, interconnection port, second line of a couplet port are not present on same veneer.
Second aspect, the present invention also provides a kind of path protecting methods, are applied to the metropolitan areas TD-LTE described above and return
It passes in network, including：
When carrying out flow transmission between any two node in the hollow networking, by traffic sharing to be transmitted
It is transmitted in several tunnel links in group；
It is directly connected to primary L2/L3 bridging devices node and spare L2/L3 bridging devices section in hollow networking
When the operating path of 4 looped networks of point breaks down, pass through the looped network path transmission flow of 4 looped networks；
Between two neighboring node in the hollow networking in 2 looped networks, in the event of one of loop direction
When barrier, flow is transmitted by another direction of loop.
Optionally, it is transmitted in several tunnel links by traffic sharing to group to be transmitted, including：
It will be transmitted in N tunnel links in traffic sharing to group to be transmitted, wherein N is greater than or equal to the tunnel links
The half for the chain for tunnel way for including in group.
Optionally, the method further includes：
When the N items activation tunnel links for load traffic break down, except the N items swash in the tunnel links group
Protection link outside tunnel links living continues to share and transmit the activation tunnel links flow to be transmitted.
In the metropolitan areas TD-LTE provided in an embodiment of the present invention return network, by active and standby L2/L3 bridging devices node, master
In the hollow networking formed with L3 device nodes and spare L3 device nodes tunnel is each equipped between two neighboring node
Link group can be transmitted with the flow between sharing nodes, realize bandwidth dilatation；In addition, passing through two between two neighboring node
Physical link is configured with 2 looped networks, is also configured at 4 points between the active and standby L2/L3 bridging devices node in hollow networking
Looped network, when the setting of these looped networks so that some network elements or link break down wherein, can use other standby network elements or
The phenomenon that destination node being transmitted to by other Protection paths, avoiding the occurrence of the flow blocking of Metropolitan Area Network (MAN) LTE PTN carryings, to
Effectively improve the stability of the metropolitan areas TD-LTE return network.
Description of the drawings
By reading the detailed description of hereafter preferred embodiment, various other advantages and benefit are common for this field
Technical staff will become clear.Attached drawing only for the purpose of illustrating preferred embodiments, and is not considered as to the present invention
Limitation.And throughout the drawings, the same reference numbers will be used to refer to the same parts.In the accompanying drawings：
Fig. 1 is that TD-LTE returns net discharge model in the prior art；
Fig. 2 is the typical networking structure figure of Metropolitan Area Transmission Network LTE PTN core layers in the prior art；
Fig. 3 is that LSP and VPN FRR protections are shown between Metropolitan Area Transmission Network LTE PTN core layer L3VPN Peer in the prior art
It is intended to；
Fig. 4 is deployment ECMP protection signals between Metropolitan Area Transmission Network LTE PTN core layer L3VPN Peer provided by the invention
Figure；
Fig. 5 is deployment looped network protection schematic diagram between two node provided by the invention；
Fig. 6 is 2 looped network protection schematic diagrames of deployment between L3VPN core nodes in the prior art；
Fig. 7 is that ICB provided by the invention disposes 4 ring+LSP 1:1 protection；
Fig. 8 is that single-link docks schematic diagram between metropolitan area PTN and the domains L3VPN for saving dry PTN in the prior art；
Fig. 9 is the deployment asymmetric polymerization schematic diagram of multilink between the domains L3VPN provided by the invention；
Figure 10 is that local network LTE PTN core layers provided by the invention dispose multipair L2/L3 schematic diagrames；
Figure 11 is that 312 optimization method network of Metropolitan Area Transmission Network LTE PTN core layers provided by the invention switches test topology
Schematic diagram；
Figure 12 is that 312 optimization method network of Metropolitan Area Transmission Network LTE PTN core layers provided by the invention switches flow chart.
Specific implementation mode
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation describes, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
In a first aspect, an embodiment of the present invention provides a kind of metropolitan areas TD-LTE return network, such as Fig. 3, Fig. 6 and Fig. 7 institute
Show, including：By primary L2/L3 bridging devices node, spare L2/L3 bridging devices node, primary L3 device nodes and spare
The hollow networking of L3 device nodes composition；
Wherein, tunnel links group, each tunnel links group are each equipped between any two node in hollow networking
In include a plurality of tunnel links；Each tunnel links group source, place only configure a routing, and will be several in traffic sharing to group
It is transmitted to another node in tunnel links；
It is also configured with 4 looped networks, 4 looped networks between two active and standby L2/L3 bridging devices nodes in hollow networking
It is configured as being directly connected to primary L2/L3 bridging devices node, spare L2/L3 bridging devices node, primary L3 device nodes, standby
With L3 device nodes；Configured tunneling technique protection group between primary L2/L3 bridging devices node and spare L2/L3 bridging devices node,
Wherein the operating path in tunnel binds above-mentioned 4 looped networks, by wherein primary L2/L3 bridging devices node, the primary L3 of approach
Device node and spare L3 device nodes, eventually arrive at the looped network path of spare L2/L3 bridging devices node；
Between two neighboring node in hollow networking by two physical links be configured with 2 looped networks, described 2 points
Looped network is configured as including the opposite loop of both direction, in the one of direction failure of loop, passes through another side of loop
To transmission flow.
In the metropolitan areas TD-LTE provided in an embodiment of the present invention return network, by active and standby L2/L3 bridging devices node, master
In the hollow networking formed with L3 device nodes and spare L3 device nodes tunnel is each equipped between two neighboring node
Link group can be transmitted with the flow between sharing nodes, realize bandwidth dilatation；In addition, passing through two between two neighboring node
Physical link is configured with 2 looped networks, also matches between the two neighboring active and standby L2/L3 bridging devices node in hollow networking
4 looped networks are equipped with, when the setting of these looped networks so that some network elements or link break down wherein, other can be used standby
It is transmitted to destination node with network element or by other Protection paths, avoids the occurrence of the flow blocking of Metropolitan Area Network (MAN) LTE PTN carryings
Phenomenon, to effectively improve the stability of the metropolitan areas TD-LTE return network.
The above method may be summarized to be 3 deployment, in addition to this, in order to further increase the security and stability of network, this
Inventive embodiments also proposed 1 polymerization and 2 principles, 3 deployment, 1 polymerization proposed below to the embodiment of the present invention
And 2 principles are described in detail.
1, the compensation process of 3 deployment namely the protection of Metropolitan Area Transmission Network LTE PTN core layers
The compensation process of the protection of Metropolitan Area Transmission Network LTE PTN core layers is increased on the basis of existing net protection scheme
Supplement improving method.Compensation process disclosure satisfy that high reliability, bandwidth are more than or equal to original PTN network link bandwidth, business energy
The features such as enough security isolations, with the non-Transmission systems altogether of existing PTN, the IP network that MPLS L3 functions can be opened, end-to-end time delay and
PTN is now netted quite.It to sum up proposes and disposes ECMP (equal cost multipath), L3VPN between supplement guard method, including L3VPN Peer
2 looped networks are disposed between core node and ICB (synchronous protocol channel) disposes 4 looped network+LSP 1:1 guard method.
1.1, ECMP is disposed between L3VPN Peer
(1) the related protection now disposed between net L3VPN Peer
Metropolitan area L3VPN network generally use hollow networkings, have multipair L2/L3 equipment that can be split as multiple hollow nets
The superposition of network.
L2/L3 nodes and L3 nodes form VPN PEER relationships (as shown in Fig. 3 section shape dotted lines) between L3 nodes, now net
Usual 1 of physical link number between PEER, PEER nodes pass through tunnel transceiving data, tunnel LSP 1:1 linear protection (such as Fig. 3 points
Shown in shape dotted line), the operating path of PEER walks shortest path, another direction is Protection path.
A band LSP 1 is used only between the VPN Peer of PTN Metropolitan Area Network (MAN)s L3VPN:1tunnel, even if certain districts and cities are in object
A plurality of physical link is deployed in reason connection, but running traditional Routing Protocol can only utilize a wherein link to transmit data
Packet, the link are easy congestion, and other links are in Status of Backups or invalid state, the waste of link circuit resource free time, and safety ratio
It is relatively low.
ECMP technical solutions are disposed in (2) 312 optimizations between L3VPN Peer
ECMP (Equal-Cost Multipath Routing, multirouting of equal value) technology, will be sent to same destination IP or
Three layers of converting flow of the same destination network segment of person are shared by different paths, realize the load balancing of network.
A plurality of tunnel is configured in each PE nodes, is configured to tunnel load sharing group (referred to as：LSP ECMP groups), it is reconfigured
One routing, routing outlet are LSP ECMP groups, and load sharing is carried out to business by HASH algorithms in LSP forwarding planes,
By all available members of traffic sharing to LSP ECMP groups, as shown in figure 4, being drawn by taking " XX complex buildings L2/L3-1 " as an example in Fig. 4
Schematic diagram is gone out, the next-hop primary path of " XX complex buildings L2/L3-1 " bundlees the LSP that deployment ECMP is formed by link 3 and 9
ECMP groups carry, and the next-hop backup path of " XX complex buildings L2/L3-1 " is by the binding of link 5 and 6, the binding of link 4 and 10, link
The LSP ECMP groups carrying that 2 and 8 bundle deployment ECMP are formed, realizes ECMP load balancings and the protection of active-standby path.
Metropolitan Area Transmission Network core layer generally use Huawei PTN3900 equipment (software V1R5 versions), in emerging ZXCTN6500 set
Standby (software V1.00.10R2 versions), only supported between core layer L2/L3 equipment to L3 equipment, active and standby L3 equipment a 10GE or
Person's GE links dock, and need software version liter to Huawei's PTN3900 equipment of metropolitan area network core layer for that can dispose ECMP technologies
Grade is V1R7, and it is V2.00.10 versions to need the software release upgrade of the emerging ZXCTN6500 equipment by.
For ■ after configuring LSP ECMP groups, source, the place of LSP ECMP groups need to only configure a routing；
The routing of ■ source points PE to two far-end PE point is main and standby relation, and service path can pass through the configuration control that shows paths
System, business load balancing in part of links, other part link is as protection link.
Two LSP ECMP of the same PE nodes of ■ correspond to two routings, and VPN FRR protections are formed between routing, same
Member in LSP ECMP groups is directed to the same far-end PE node；
It can configure least member's number in ■ LSP ECMP, least member's number should be able to meet the service bearer bandwidth need between PE
It asks.Such as, it is assumed that bandwidth demand is 15GE between PE, then it is 3-4 that least member's number, which should be the total number of members suggestions of 2, LSP ECMP,.
When in LSP ECMP least member's number can be less than with number of members, triggering VPN FRR are switched；
The group attribute of the tunnels ■ ECMP groups：It is maximum that minimum activation number of members suggestion is set as membership/2, LSP ECMP
Support 16 members.
■ disposes ECMP in L3 equipment rooms, L2/L3 equipment rooms, L3 equipment rooms and each newly-increased 1 link of L2/L3 equipment rooms
Afterwards, 3 link failures can be resisted.
In addition, with the increase of LTE base station quantity, the 10GE links of the increase of bandwidth of base station demand, core layer cannot expire
Sufficient bandwidth demand, the load balancing for realizing the dilatation of N*10GE bandwidth and multilink by disposing ECMP between VPN Peer.
1.2,2 looped networks are disposed between L3VPN core nodes
To improve internet security, 312 optimization of Metropolitan Area Network (MAN) proposes 2 looped networks of deployment between L3VPN core nodes.
The optimization content can be disposed as the supplement or multiple protective of " dispose ECMP between VPN Peer ".Xian Wang Huawei region
PTN3900 (V1R5) does not support ECMP, and LTE service traffics can not be carried to improve multilink is disposed between disposing PEER
Safety, it is proposed that dispose looped network protection in point-to-point transmission, or realize and resist 3 link failures, cannot upgrade to for other
The NE type of V1R7 can also dispose the looped network protection.
By after two physical links dispose 2 looped networks between the PEER nodes of L3VPN, as shown in Figure 5.Business is normal
Situation flows away along the signal pre-established, and such as the signal stream of top in Fig. 5, when I failure of physical link, business is switched to figure
II lower signal stream of middle physical link, without causing the end-to-end tunnel carried on ring, the event of only 2 physical links
Barrier, can just occur tunnel 1:1 pretection switch.
1 link of dilatation between Metropolitan Area Transmission Network LTE PTN core nodes is forming 2 looped networks guarantors with original with link
Shield, will by the upper ring bindings of all tunnel between the two core nodes, protection deployed position as shown in fig. 6, L2/L3 extremely
2 looped network protections are disposed between L3 nodes, between L3 nodes.
Looped network protection includes the ring for two opposite directions protected each other, and each direction includes that work and protection ring are logical
Road, by protecting channel to provide the bandwidth of redundancy, after network failure or deterioration, distributed service can be restored automatically.Looped network
Can self-healing, be independent logical level, be easily managed；It is switched based on looped network, it is fast to switch speed.
1.3, ICB disposes 4 ring+LSP 1:1 protection
It needs to establish ICB (synchronous control protocol channel, commonly referred to as heartbeat) between L2/L3 nodes, for carrying MC-
The hot standby table of LAG protocol massages, ARP (synchronizing ARP entry from main L2/L3 nodes for standby L2/L3 nodes), BFD agreements etc..Existing
Once ICB channel interrupts in net, this all blocks lower band LTE base station business of L2/L3 nodes, which occurred in 2015
It crosses repeatedly, causes a lot of districts and cities and block.
312 optimizations propose ICB and dispose 4 ring+LSP 1:1 protection scheme, as shown in Figure 7.I.e. first in L2/L3
Tunnel 1 is disposed between node:1 protection, operating path select direct connected link between L2/L3 nodes, such as Fig. 7 links 5, protect road
Diameter selects XX complex buildings L2/L3-1, and --- --- XX is comprehensive by bis- hinge L3 of XX --- bis- hinge L2/L3-1 of XX --- by XX complex buildings L3
Building L2/L3-1 is closed, then L2/L3 inter-node links 5 and 6 dispose 2 looped network protections, and above-mentioned operating path is bundled in looped network,
The ICB of L2/L3 nodes is realized when being carried on active and standby Tunnel, service path is practical in three physical link carryings and guarantor
Shield.
When physical link 5 or 6 failure, looped network protection switching occurs first for operating path tunnel, and tunnel does not occur
1:1 pretection switch.Only when physical link 5 and 6 simultaneous faults, tunnel 1 occurs:1 pretection switch, is switched to Protection path,
It realizes and resists 2 failures.It needs looped network protection switching stalling for time setting less than tunnel 1 in configuration process:1 protects
Protective switching is stalled for time, and secondary switch is avoided.
2, the asymmetric polymerization of multilink is disposed between 1 polymerization namely the domains L3VPN
Metropolitan area PTN with save that do docking for PTN be docking between the domains L3VPN, docked using using Native IP, in core
The static routing that PTN does in province, and configuration of IP/VPN mixing FRR are gone in configuration on PTN.
It is docked using the single ports 10GE in now netting, there are problems that safety is low and bandwidth deficiency.As shown in Figure 8.This 312
Optimization proposes 1 polymerization, i.e.,：Multilink is disposed between domain in the VRF for the L3VPN for saving the L3VPN and metropolitan area PTN that do PTN
Asymmetric polymerization.
Link aggregation technology is to bundle multiple physical ports as a logic interfacing (trunk interface) to make
With can not only improve link bandwidth, can also improve internet security.Physical port is known as the member of Trunk in aggregation group.
The asymmetric polymerization of multilink that 312 optimization of Metropolitan Area Transmission Network proposes refers to that the active and standby L3 in metropolitan area is used with dry PTN is saved
ETH-Trunk Port BindingBundling technologies, metropolitan area L3 equipment bundle interconnection with computer room districts and cities main line PTN device by N*10GE, and
It is to be set as asymmetry value by the ETH-Trunk minimum activity chain ways of active and standby L3.As shown in Figure 9.
Test of many times is passed through in the asymmetric polymerization of multilink, it is proposed that primary L3 nodes ETH-TRUNK UP=N (i.e. minimum activities
Number of links is equal to aggregation group number of members, N<=16), spare L3 nodes ETH-TRUNK UP=N/2 (i.e. minimum activity chain ways etc.
In the half of aggregation group number of members).
When carrying out message forwarding, if trunk interface agreement is UP states, Trunk can utilize hash algorithm one selected
The member port of UP sends message as real outgoing interface.Hash algorithm can be according to certain mode, such as message
Source/destination IP address, packet-by-packet, UPD messages packet-by-packet etc., as possible will be in traffic sharing to each member port for TCP message.And Hash
Mode is definable on logic interface.
The asymmetric polymerization advantage of multilink is carried out between the domains L3VPN：
The primary L3 nodes ETH-TRUNK UP=N of ■ can increase original link bandwidth, realize the load balancing of flow.
■ is when certain link failure in primary ETH-TRUNK, primary ETH-TRUNK meeting auto switchings to spare ETH-
TRUNK will not be reduced because of activity chain way and be caused flow congestion.
The spare L3 nodes ETH-TRUNK UP=N/2 of ■, when primary ETH-TRUNK failures auto switching to spare ETH-
After TRUNK, even if spare have link failure again, as long as faulty link number is less than the half of number of members N, spare ETH-TRUNK meetings
Normal work, may have link congestion, but avoid business blocking, can greatly avoid significant trouble.
■ is convenient for follow-up dilatation, when dilatation that need to only increase link member after disposing Eth-Trunk, without issuing additional business road
By.
BFD rapid link inspections can be disposed when ■ Eth-Trunk docking, BFD for IP can be used with producer's docking, it is different
BFD for Port can be used in producer's polymerization.
3,2 principles, namely " LTE PTN local network core layer key veneer separation principles and dilatation principle
Two L2/L3 bridge joints are set in now netting only disposes a 10GE link between active and standby L3 equipment.If there are cores
It is complete that layer physics with Cable's Fault at single board default or 1 at the veneer either same path 1 of business this may result in entire districts and cities' business
Resistance, the type situation also occurred a lot of in the whole nation in 2015.This patent proposes LTE PTN local network core layer key veneers point
From principle and dilatation principle, existing net is safeguarded, optimization and network design have important directive function.
3.1, LTE PTN local network core layer key veneer separation principle
Local network LTE PTN core layers physics with veneer refer to L3 PTN devices, L2/L3 PTN devices first line of a couplet port,
It is not present on same veneer in interconnection port, second line of a couplet port.As the link 1,2,3 or 1,2,4 in figure 10 above exists together
Physical board.
Core layer service diameter of going the same way refers to all LSP 1 arrived involved in L3VPN:The active-standby path of 1 protection is in addition to sourcesink
Outside the landing plate position of node, main standby route have passed through same PTN plates position, the same end PTN device or same wavelength-division routing.
(1) the L3 PTN devices first line of a couplet saves dry veneer, the other L3 PTN device veneer of interconnection, second line of a couplet L2/L3 equipment not
It veneer, i.e. upper figure link 1,2,3,4 can use in different veneers altogether, prevent 1 piece of single board default from causing 2 links blockings
Or 1 piece of single board default causes 2 pairs of unilateral operations of L2/L3 equipment.
(2) the active and standby physical link of ICB/ICCP heart-beat protocols is carried between L2/L3 PTN devices cannot be total to veneer, and link is not
There can be physics with routeing, figure link 5,6 as above, Specific Principles are as follows：
● interconnection port cannot be total to veneer between L2/L3 PTN devices, i.e. inter-connection links will at least be shared in two pieces of physics lists
Plate prevents 1 piece of single board default from 2 links being caused to block.
● inter-connection links should not be carried on a wavelength-division system between L2/L3 PTN devices.Interconnected between L2/L3 PTN devices
2 links to be at least carried on two wavelength-division systems, and two wave division paths cannot have with routing.
● physical link is interconnected between L2/L3 PTN devices cannot be carried in an interoffice cable.That is L2/L3 PTN devices
Between 2 links interconnecting at least to be carried in two optical cables, walked physical pathway is route according to wavelength-division system, by 2 chains
Road will be at least carried in two optical cables.
(3) L2/L3 PTN devices first line of a couplet L3 equipment veneers, L2/L3PTN equipment rooms carrying L3VPN links veneer cannot
Veneer altogether prevents 1 piece of single board default from LTE base station upstream flow being caused to block.
(4) the active and standby physical link of DNI PW looped networks is carried between Huawei L2/L3 PTN devices cannot be total to veneer, and link cannot
There is physics with routing, it is desirable that with the link requirement of carrying ICB.
(5) veneer of emerging L2/L3 PTN second lines of a couplet convergence ring cannot carry the convergence ring group station between L2/L3 PTN devices in
The interconnection veneer of PW dual homeds is total to plate, prevents the LTE base station downlink traffic that 1 piece of single board default causes a convergence ring carrying from blocking.
(6) service path needs to detach with routing, all LSP 1 arrived involved in L3VPN:The active-standby path of 1 protection, removes source
Cannot have the same path of business, the same veneers of PTN, the same routing issue of wavelength-division outside destination node, guard against equipment room physical link have it is a plurality of
Link and service path exist with routing hidden danger.
3.2, LTE PTN local network core layer key veneer dilatation principle
Core is can be seen that from the LTE PTN local network core layer key veneer separation principles of 312 optimization of Metropolitan Area Transmission Network
It also has to follow certain principle when central layer link dilatation, random selection veneer, port dilatation possibly can not play raising
The effect of safety.For this purpose, 312 optimization of Metropolitan Area Transmission Network also proposed LTE PTN local network core layer dilatation principles.
(1), safety principle of optimality：The case where slot position meets, idle slot position is selected newly to plug in veneer, using across version link
It polymerize and shares, excludes the hidden danger of veneer altogether.
(2), it is unsatisfactory for or invests in slot position to be unsatisfactory for situation, reuse existing net veneer and port, preferably L3 equipment uplink
Link is total to plate using veneer and downlink using veneer, and according to existing net protected mode, which does not interfere with existing network service.
(3), under the conditions of above-mentioned 1,2 cannot be satisfied, it is still necessary to select uplink and inter-connection links to be total to veneer when dilatation
Or downlink and inter-connection links are total to veneer, but such situation must satisfy the uplink of former link and inter-connection links are not total to
Veneer, downlink and inter-connection links are not total to veneer, and otherwise single board default will cause entire districts and cities LTE business to block at one.
(4), dilatation disposes ECMP using the VPN Peer proposed in this patent innovative point inside Metropolitan Area Transmission Network L3VPN,
Metropolitan Area Transmission Network L3VPN and province use when doing L3VPN docking link dilatations and propose the asymmetric polymerization of multilink in innovative point.
4, technical solution is verified
A kind of 312 optimization method of Metropolitan Area Transmission Network LTE PTN core layers, through in branch company of Inner Mongolia mobile T districts and cities the whole network
Verification, scheme meets expected requirement, specific as follows：
4.1, network switches test topology
Test topology：To original related network elements in Metropolitan Area Transmission Network LTE PTN core layers and link using number 1 to 12 into
Row number, as shown in figure 11, Green route sheet show new dilatation link.
According to previous analysis, following 14 kinds of scenes can cause business to block, i.e., the districts and cities that Metropolitan Area Transmission Network can be caused to carry
The S1 interface business of the base stations eNodeB to EPC core nets blocks.
| Serial number | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
| Scene (simultaneous faults) | (1)(3) | (1)(11) | (1)(12) | (2)(7) | (2)(10) | (2)(12) | (3)(4) |
| It influences | Full resistance | Full resistance | Full resistance | Full resistance | Full resistance | Full resistance | Full resistance |
| Serial number | 8 | 9 | 10 | 11 | 12 | 13 | 14 |
| Scene (simultaneous faults) | (3)(5) | (4)(7) | (4)(9) | (4)(10) | (4)(11) | (5)(10) | (7)(8) |
| It influences | Full resistance | Full resistance | Full resistance | Full resistance | Full resistance | Full resistance | Full resistance |
4.2, network switches test method
Metropolitan Area Transmission Network LTE PTN core layers are pulled out after the optimization of 312 optimization methods using closing laser or scene
Line mode simulates this 14 kinds of scenes, and in the test of each scene, the MME of 10000 1000 bytes is carried out in LTE core network side
The download test of LTE mobile phones is carried out to the icmp packet Ping Test of base station, and in districts and cities, it is provincial company LTE to download file
Test the speed server 500M Bits big file.
By test, Metropolitan Area Transmission Network LTE PTN core layers by 312 optimization methods optimization after above-mentioned fault scenes no longer
Lead to LTE service disconnections, after failure occurs at somewhere or two, the pretection switch that Metropolitan Area Transmission Network core layer can respond, LTE
Service traffics are not interrupted, and handover delay is less than 50 milliseconds, and LTE business switches front and back LTE mobile phone-downloadeds rate without packet loss, comparison,
Without significant change.The critical networks such as the LTE base station before and after comparison pretection switch and time delay, shake, packet loss between EPC core nets
Index, without significant changes, entire pretection switch meets the operation quality requirement of LTE carryings.
After the fault recovery of simulation, network switchback can be switched smoothly to former discharge model, whole process automatically, nothing
Packet loss generates.
4.3 networks switch algorithm
It is as follows to switch the core algorithm that algorithm is related to for network in the present invention：
When single-point occurs for Metropolitan Area Transmission Network LTE PTN core layers or two points fault generates, the Metropolitan Area Network (MAN) core after optimization
Central layer switches algorithm：
● when certain link or single board default, the pretection switch for 2 looped networks disposed first is active and standby
Tunnel is not switched.
● when failure occurs at two, if failure is happened between a pair of of L3VPN Peer at two, active and standby Tunnel occurs
Switch；If failure is happened at difference between L3VPN Peer at two, each pair of L3VPN Peer respectively independently occur at 2 points
The pretection switch of looped network, without switching for active and standby Tunnel occurs.
● when node failure or link failure everywhere occurs, operation source PE is equal to the active-standby path for the place PE equipment that works
Failure, occurs VPN FRR protections at this time, and operation source PE is switched to protection place PE equipment, without causing business to block.
● metropolitan area L3 equipment interconnections, which save, does switching for L3 equipment, primary when certain link failure in primary ETH-TRUNK
ETH-TRUNK meeting auto switchings will not reduce because of activity chain way to spare ETH-TRUNK and cause flow congestion.
● metropolitan area L3 equipment interconnections, which save, does switching for L3 equipment, spare when certain link failure in primary ETH-TRUNK
When ETH-TRUNK has 1 physical link failure, primary ETH-TRUNK meeting auto switchings to spare ETH-TRUNK, spare L3 sections
Point switches flow to movable physical member's link from 2 physical members, as long as that is, faulty link number is less than number of members N
Half, spare ETH-TRUNK can work normally, and may have link congestion, but avoid business blocking, can greatly keep away
Exempt from significant trouble.
Algorithm when failure vanishes, as shown in figure 12, including：
● in Metropolitan Area Transmission Network LTE PTN core layer equipments using MPLS OAM, MPLS-TP OAM detection LSP and looped network
Failure, while the failures of the ports 10GE is quickly detected using 802.3ae and BFD technologies, if the original paths LSP occur when unreachable
Corresponding looped network is switched to be switched with LSP, is switched if when unreachable corresponding VPN FRR occur for former routing.When MPLS OAM,
The 10GE port failures that MPLS-TP OAM detect the failure of LSP and looped network and 802.3ae and BFD technologies is used quickly to detect are extensive
It is multiple normal, judge that the corresponding path of the node and routing become reachable from unreachable；
● original route or former routing are available at this time, and triggering looped network protection, LSP protections and VPN FRR protect switchback, business
It is returned to former discharge model.
Second aspect, the embodiment of the present invention additionally provide a kind of path protecting method, using with the TD- described in first aspect
In the metropolitan areas LTE return network, including：
When carrying out flow transmission between any two node in the hollow networking, by traffic sharing to be transmitted
It is transmitted in several tunnel links in group；
It is directly connected to primary L2/L3 bridging devices node and spare L2/L3 bridging devices section in hollow networking
When the operating path of 4 looped networks of point breaks down, pass through the looped network path transmission flow of 4 looped networks；
Between two neighboring node in the hollow networking in 2 looped networks, in the event of one of loop direction
When barrier, flow is transmitted by another direction of loop.
In the specific implementation, it is transmitted in several tunnel links by traffic sharing to group to be transmitted, including：
It will be transmitted in N tunnel links in traffic sharing to group to be transmitted, wherein N is greater than or equal to the tunnel links
The half for the chain for tunnel way for including in group.
In the specific implementation, the method further includes：
When the N items activation tunnel links for load traffic break down, except the N items swash in the tunnel links group
Protection link outside tunnel links living continues to share and transmit the activation tunnel links flow to be transmitted.
Due to above for the workflow of the metropolitan areas TD-LTE provided in an embodiment of the present invention return network into
Detailed description is gone, details are not described herein the path protecting method based on the network.
It should be noted that the present invention will be described rather than limits the invention for above-described embodiment, and ability
Field technique personnel can design alternative embodiment without departing from the scope of the appended claims.In the claims,
Any reference mark between bracket should not be configured to limitations on claims.Word "comprising" does not exclude the presence of not
Element or step listed in the claims.Word "a" or "an" before element does not exclude the presence of multiple such
Element.The present invention can be by means of including the hardware of several different elements and being come by means of properly programmed computer real
It is existing.In the unit claims listing several devices, several in these devices can be by the same hardware branch
To embody.The use of word first, second, and third does not indicate that any sequence.These words can be explained and be run after fame
Claim.
Claims (10)
1. a kind of metropolitan areas TD-LTE return network, which is characterized in that including：By primary L2/L3 bridging devices node, spare L2/
The hollow networking of L3 bridging devices node, primary L3 device nodes and spare L3 device nodes composition；
Wherein, tunnel links group, each tunnel links group are each equipped between any two node in the hollow networking
In include a plurality of tunnel links；Each tunnel links group source, place only configure a routing, and will be several in traffic sharing to group
It is transmitted to another node in tunnel links；
Also match between primary L2/L3 bridging devices node and spare L2/L3 bridging devices node in the hollow networking
4 looped networks are equipped with, 4 looped networks are configured as being directly connected to primary L2/L3 bridging devices node, spare L2/L3 bridge joints
Device node, primary L3 device nodes, spare L3 device nodes；Primary L2/L3 bridging devices node is set with spare L2/L3 bridge joints
Protecting tunnel group is configured between slave node, the wherein operating path in tunnel binds above-mentioned 4 looped networks, the looped network path in tunnel
For by primary L2/L3 bridging devices node, primary L3 device nodes and spare L3 device nodes described in approach, most Zhongdao
Up to the path of spare L2/L3 bridging devices node；
Between two neighboring node in the hollow networking by two physical links be configured with 2 looped networks, described 2 points
Looped network is configured as including the opposite loop of both direction, in the one of direction failure of loop, passes through another side of loop
To transmission flow.
2. metropolitan area return network according to claim 1, which is characterized in that the tunnel links that each tunnel links group includes
Number meets the bandwidth demand of the flow transmission of two nodes of the tunnel links group connection.
3. metropolitan area return network according to claim 2, which is characterized in that for sharing and passing in each tunnel links group
The activation chain for tunnel way of defeated flow is greater than or equal to the half of the chain for tunnel way in the tunnel links group included.
4. metropolitan area return network according to claim 3, which is characterized in that remove the activation tunnel in each tunnel links group
Tunnel links other than road link are configured as protection link, and the protection link breaks down in the activation tunnel links
When, continue to share and transmit the activation tunnel links flow to be transmitted.
5. metropolitan area return network according to claim 1, which is characterized in that the primary L3 device nodes, spare L3 are set
Slave node is configured with aggregated links between doing the dry spare L3 device nodes of primary L3 device nodes and province with province respectively；It is described primary
The minimum activity chain way of the aggregated links of L3 device nodes, spare L3 device nodes is configured as asymmetry value.
6. metropolitan area return network according to claim 5, which is characterized in that the aggregated links of the primary L3 device nodes
Minimum activity chain way be total physical link number of members, the minimum activity chain way of the aggregated links of spare L3 device nodes is
The half of total physical link number of members.
7. metropolitan area return network according to claim 1, which is characterized in that the active and standby L2/L3 bridging devices section
Each node in point, primary L3 device nodes and spare L3 device nodes is configured as the first line of a couplet port of setting, interconnection end
Mouth, second line of a couplet port are not present on same veneer.
8. a kind of path protecting method is applied in the metropolitan areas the TD-LTE return network as described in claim 1 to 7 is any,
It is characterized in that, including：
When carrying out flow transmission between any two node in the hollow networking, by traffic sharing to be transmitted to group
It is transmitted in several interior tunnel links；
It is directly connected to primary L2/L3 bridging devices node and spare L2/L3 bridging devices node in hollow networking
When the operating path of 4 looped networks breaks down, pass through the looped network path transmission flow of 4 looped networks；
Between two neighboring node in the hollow networking in 2 looped networks, in one of loop direction failure
When, flow is transmitted by another direction of loop.
9. path protecting method according to claim 8, which is characterized in that it is described will be in traffic sharing to group to be transmitted
Several tunnel links in transmit, including：
It will be transmitted in N tunnel links in traffic sharing to group to be transmitted, wherein N is greater than or equal in the tunnel links group
Including chain for tunnel way half.
10. path protecting method according to claim 9, which is characterized in that the method further includes：
When the N items activation tunnel links for load traffic break down, except the N items activate tunnel in the tunnel links group
Protection link outside road link continues to share and transmit the activation tunnel links flow to be transmitted.
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| CN114024907A (en) * | 2021-11-15 | 2022-02-08 | 中国电信集团系统集成有限责任公司 | Flow scheduling method and system under multi-port annular structure |
| CN114650254A (en) * | 2021-12-10 | 2022-06-21 | 中国联合网络通信集团有限公司 | Method and device for determining service path and computer readable storage medium |
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