CN1773947A - Method for realizing optical group broadcasting in intelligent optical network - Google Patents
Method for realizing optical group broadcasting in intelligent optical network Download PDFInfo
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Abstract
A method for realizing light multicast in intelligent light network includes forming user group management base by utilizing service management module in management layer; applying light multicast mechanism managed by management layer and control layer and utilizing manner of dynamically setting up multicast route, adding and deleting leaf node, summing-up link and setting up connection one by one to achieve light multicast on large network for saving a lot of routes and bandwidth.
Description
Technical field
The invention belongs to communication field, relate in particular to the method that realizes multicast group foundation in the ASON in the field and make full use of link circuit resource.
Technical background
Along with deepening continuously of transfer of data demand, transfers net system is developing deepening continuously, and relevant technology is also in fast development.In fact, based on the transmission network architecture of ASON the condition created that provides, promoted by the evolution of transmission network to business network for new business.Along with going deep into of Automatic Switched Optical Network Technology development and research, operator extensively requires to support OVPN (OpticalVirtual Private Network, OVPN) and the providing of BOD new business such as (bandwidth on demands), continue to bring out thereby promote various new business to supply a pattern, the realization of these new business patterns has become the key technology of ASON research.
Because ASON (ASON) is between traditional webmaster plane and transmission plane, increased one deck control plane, make the complexity of network management and business configuration reduce greatly, make operator can on a large amount of customer bases, optimize bandwidth availability ratio reducing operation and expense, the ability of clicking the assignment optical link fast is provided, supports division, and can not increase the chance that opens up new markets and provide value added service for operator under the new hardware devices circumstances Internet resources.
Concerning the terminal use; ASON can be between the user the suitable bandwidth of assignment fast connect, provide kinds of protect and Restoration Mechanism, the report that provides by SLA (grade of service convention) and network carries out performance monitoring; and the customer network that can realize safety charges, and safety moves, manages, safeguards and supply etc. network under situation about significantly reducing cost.
As can be seen, the ASON service provides a safety, manageable environment, makes the user can make full use of the flexibility of exchange ASON in the scope that can trust.Connection between them is created and deleted to edge device in the control plane can be directly by signaling method, and network can provide auto discovery mechanism and charging way comparatively flexibly between same group user simultaneously.
Meanwhile, ASON can utilize some controls and administrative skill, with certain a part of resource in the optical-fiber network be that some are transnational, the company of cross-region and enterprise-specific.We can say that ASON is a kind of new method of service in the optical-fiber network, a kind of new value-added service in other words conj.or perhaps.
The problem that the conventional optical network path creates a mechanism is, if setting up a node is source node, a plurality of nodes are the broadcasting service of receiving node, must set up a large amount of connections, expend the port resource between a large amount of CE (customer equipment) and the PE (service provider's equipment), and a large amount of backbone network wavelength and time interval resource; If the user increases, the network that then needs to set up connects, the port resource and the network bandwidth that take roll up, thereby taken a large amount of operator's resources, under the situation that business can be shared in group, if when a data source has two purpose users, need set up two paths, when N user arranged, need set up the N paths; If when having N user to connect in twos in a user organizes; then need to set up nearly N* (N-1)/2 paths; what bring is very huge to taking of port and time interval resource, and the service class of bringing thus, protection recovery capability all have very big decline.The another one problem is that the method that the conventional optical network path is set up lacks the requirement of the desired real-time of actual deployment, flexibility and fast and reliable, self-healing often by the webmaster assignment.
Summary of the invention
Technical problem to be solved by this invention provides the method that realizes the light multicast in a kind of ASON, serious in the hope of backbone network wavelength and time interval resource, port resource and network bandwidth waste in the ASON that overcomes the prior art existence, and can't satisfy problems such as real-time, flexibility and fast and reliable, self-healing requirement.
The method that realizes the realization of light multicast in ASON of the present invention comprises the steps:
The unified unique service identification of the overall situation of setting up has only the connection of same service attribute can reuse existing path;
For source node is set up a multicast group based on same data source, this multicast group can realize in the multicast member group of management plane and multicast address, also can realize in the multicast group of the CE of source node or PE and multicast address.Draw a multicast table behind each member of group membership table,,, extend multicast path backward according to the form of binary tree (or tree) if having then the mode the same with the group address table set up multicast path if do not have multicast path then for empty;
When certain light multicast service of a user applies, at first, calculate a service path according to the multicast routing table of control plane source end or management plane maintenance;
Search the route of identical services attribute in the source node then, if same paths part is arranged, then set up multicast path by, carry out compound in initial path, just before branch node, do not carry out the reservation of resource and issue, at branch node, the expansion of carrying out network element node device cross-port connects and switches;
Set up the process of setting up that message continues new route by the path of GMPLS signaling then again, in this process, the GMPLS signaling is only set up new path, and existing utilizable path does not repeat to set up, and only the forwarding of carrying out new port at branch node is switched.
The method that realizes the light multicast in ASON mainly comprises two kinds of situations, a kind of distributed implementation that is based on control plane, a kind of centralized implementation that is based on management plane.
The concrete implementation step that realizes the light multicast by management plane is:
(1) new user is by logging on the multicast service module of management plane, check the multicast source that search is required, required ID of corresponding multicast group and password are landed in application and verification, check this group network topology situation, add the group membership then, information such as the authority of group membership table and member port address are set;
(2) trigger the multicast source node device and set up process, begin calculating path, start to the link setup process of destination node by signaling by entry PE to the connection that newly adds between the access customer member;
(3) source node PE compares the service path that calculates and the existing path in the multicast address, finds out the node of identical path and beginning branch, sends the link setup request to adjacent PE then;
(4) message is set up in the path expanded in the PE that destination interface links to each other sends by the GMPLS signaling of the PE of source node, and for co-route, according to the strategy of reserved path, shared use is reserved resource before, does not issue; If current bandwidth etc. are undesirable, then carry out the correction of bandwidth by mechanism such as BOD;
(5) after message arrival breakout is set up in the path, to setting up new path between the destination node;
(6) after purpose CE port is received the message of link setup path request, if agree current setting, send acknowledge message, the PE that destination interface links to each other begins to return RESV to source node;
(7) after RESV arrives breakout, on branch node equipment, carry out the node device intersection switching action of inbound port to two outbound port, promptly increase a intersection, increase by one to the new direction that adds destination node to a 1XN of D direction execution from original inbound port; If RESV is no longer reserved, do not issue switching action to transmitting the agency under situation about having reserved before the experience;
(9) source port CE equipment is received the successful message of path foundation, send test to two destination devices, if receive correct response, then to fill in the multicast address on the source node equipment and be synchronized in the multicast routing table of management plane, multicast address travels through according to the form of tree and mates.
The multicast user member that will look for novelty based on the implementation of control plane can find source node by the mechanism of finding automatically, and directly send to the source node request by signaling and add, the multicast path that calculates destination node if source node is adhereed to by, implement the link setup process and the result added in multicast group and the multicast address.
Require the source end of control plane to announce with regard to the program of oneself, destination node requires the multicast tree of adding source end, must use signaling to send request, perhaps files a request to the multicast management unit of management plane.
The concrete implementation step that realizes the light multicast by control plane is:
(1) new user wants to join the light multicast group, finds the service source node PE that needs by auto discovery mechanism or route flooding mechanism, sends a signaling and joins this multicast group to this source node requirement, applies for corresponding password simultaneously;
(2) if new purpose user has had the password of this multicast group, then the signaling of landing by expansion is dealt into source node PE, and required ID of multicast group and password are landed in verification;
(3) if source node equipment allows newcomer's equipment to add the light inlet multicast group, then trigger the process in entry PE computing service path, start to the link setup of destination node by signaling;
(4) source node PE compares the service path that calculates and the existing path in the multicast address, finds out the node of identical path and beginning branch, sends the link setup request to adjacent PE then;
(5) message is set up in the path expanded in the PE that destination interface links to each other sends by the GMPLS signaling of the PE of source node, and for co-route, according to the strategy of reserved path, shared use is reserved resource before, does not issue; If current bandwidth etc. are undesirable, then carry out the correction of bandwidth by mechanism such as BOD;
(6) after message arrival breakout is set up in the path, to setting up new path between the destination node;
(7) after purpose CE port is received the message of link setup path request, if agree current setting, send acknowledge message, the PE that destination interface links to each other begins to return RESV to source node;
(8) after RESV arrives breakout, on branch node equipment, carry out the node device intersection switching action of inbound port to two outbound port, promptly increase a intersection, increase a direction to destination node to a 1XN of D direction execution from original inbound port; If RESV is no longer reserved, do not issue switching action to transmitting the agency under situation about having reserved before the experience;
(9) source port CE equipment is received the successful message of path foundation, send test to two destination devices, if receive correct response, then to fill in the multicast member table on the source node equipment and be synchronized in the multicast routing table, multicast address travels through according to the form of tree and mates.
The multicast route calculation comprises based on multiple constraints:
(1) when setting up shortest path, the one, the shortest to the jumping figure between the destination node, the 2nd, newly-built path is the shortest, promptly utilizes the path of having set up to greatest extent, can use existing access path by searching original multicast routing table as far as possible;
(2) multicast path that calculates optical-fiber network can add the constraint of explicit path or node by the requirement that will satisfy link bandwidth and port ability;
The protection of backbone route and recovery level can not be lower than to the protection of any one destination node multicast path and recovery level;
Multicast member can dynamically add or leave the multicast tree that has existed, and does not influence already present multicast service, so when the connection that the deletion leaf node withdraws from, can not have influence on the required connection of other leaf node;
Increase bandwidth if desired, then need to hold consultation, revise the link bandwidth of compound path with source node.
If new path requires to revise the SLA rank, if strategy allows, then on the basis of original link, start the requirement of protection and restoration path, if link setup request afterwards is lower than current requirement, then keep existing link.
When tearing chain open, client member CE sends the dismounting connection process by the GMPLS signaling to the PE end that links to each other, and the path deletion message that sends the GMPLS signaling mechanism is to each destination node PE; If belong to multicast path between some node of link, then this section link keeps; If source node the member withdraw from, then send path deletion message to all multicast members.
Requirement to route mechanism is:
Calculating section at the multicast routing tree, by the routing module control centralized calculation multicast path of source node by, going out one according to topology of networks and multicast service property calculation is that root, destination node are the multicast tree of leaf with the source node, and calculate source node to unique source routing of each leaf node, the structure of tree and route record in multicast routing table, and are fed back to management plane and manage in order to inquiry and multicast service.
Wherein, the structure of multicast routing algorithm will adopt from the tree trunk to increasing the cumulative big process calculating of the tree multicast tree that branch increases leaf based on shortest path first.Calculate the backbone route of a destination node of startup multicast service earlier, the information of record node wherein to source point.Add when calculating the intermediate node when calculating the optimum route of this destination node each node in backbone route, i.e. Shu a bifurcation as other destination node.And then can calculate the multicast path (like this tree of structure is not optimum, can receive to adjust strategy) of root.The deposit position of multicast routing table is relevant with realization mechanism, can leave concentratedly at management plane, also can deposit (as UNI-C or UNI-N) at the source node of control plane.
Requirement to signaling mechanism is:
The GMPLS signaling protocol runs through and operates in uni interface and network internal, is established to the source routing of the point of each leaf node to multiple spot from source node.For multicast service, in signaling message, use the unique multicast group id of the overall situation to identify the business that belongs to same multicast distribution tree and connect, will think that the source is the difference connection of same multicast ID business to the connection of each leaf.
When the connection of leaf node is set up, when the signaling paths that carries same multicast ID service identification is set up message through each node, application time slot label, need judge whether other connection of same multicast service in process source.If other that can not find out same multicast service when this node is reserved distributing labels connects, think that then the node that the message process is set up in the path do not setting up on the path, processing procedure is the same with setting up the general service path.If other that can find same multicast service when distributing labels connects, then think the path set up message through point also on other of same multicast service connect, whether the outgoing link of further judging this connection is identical with the existing outgoing link that is connected.If the outgoing link that the outgoing link that other connection of same multicast service is used connects therewith is inequality, think that then this node is bifurcation, will connects for this reason and distribute new label.When message is set up in these paths to each leaf node, when returning, the RESV of answer also carries out the inspection of interconnection conversion respectively, and sign successful connection when source node.Like this, a plurality of unidirectional paths are multiplexing identical resource before the crosspoint, has formed the path tree of point-to-multipoint.
Adopt method described in the invention, must could between all of the port, set up link by the mode that connects in twos when having avoided between a plurality of user ports, connecting, so that expend a large amount of CE and the port resource between the PE and a large amount of backbone network wavelength and the shortcoming of time interval resource, saved taking of a large amount of resource of operator, and then make the cost of network upgrade obviously reduce, if employing the method for the invention, analyze the link that to set up less about half as can be known by statistics and just can meet the demands, and the many more advantages of member are obvious more.The saving to port and time interval resource that brings also is very significant, and service class of bringing thus and protection recovery capability all can correspondingly improve.And, under the bigger situation of node scale, can not need traditional diffusion that Routing Protocol carries out multicast address of passing through, passing through to management plane goes to search, just can obtain the multicast routing iinformation of other all members in this group fast, avoided carrying out multicast path by unreliability, the speed of diffusion complexity problem slow and that when network size increases the network layer increase, bring, reduced different routing protocol is expanded the risk problem that interconnection and interflow is caused by Routing Protocol.
Under the mechanism of ASON, realize the multicast mode by control plane of the present invention, can realize very easily existing intelligent optical network equipment is carried out level and smooth upgrading, directly realize the support of light multicast and the compound use and the dynamic assignment of link, the participation on Unsupervised plane; Notify newcomer's adding and triggering multicast to set up process by signaling, directly the signaling mechanism between source node and the destination node can guarantee the rapid and reliable multicast path of setting up, and realizes the generation and the maintenance of multicast member table and multicast routing table.In addition, by the use of global group membership's address table, can generate the client fast and net visible topological view, the operating position of light multicast to resource also can be seen by operator; By directly searching the SLA strategy of service management module, can customize and plan with the attribute that is connected network easily, be convenient to realize mechanism such as protection recovery; Be connected bandwidth etc. and add up by present port being connected situation and the current actual backbone network that takes place, help realizations such as charging, also can understand current charging case in real time as the client, and adjust being connected at any time with charge level according to current resource operating position, comprise rebuliding connection, disconnect connection and revise connection attribute and bandwidth etc.In addition, the method for the invention isolation that can carry out information between the management of multicast path and the different user terminals is easily filtered.
Description of drawings
Fig. 1 is a group management schematic diagram in the method for the invention.
Fig. 2 is a multicast path node processing flow chart in the method for the invention.
Fig. 3 is based upon group membership's table multicast table structure chart afterwards in the method for the invention.
Fig. 4 is the signaling process flow chart between the node in the method for the invention.
Fig. 5 starts the flow chart that multicast path is set up in the method for the invention.
Fig. 6 is the flow chart that multicast path is removed in the method for the invention.
Embodiment
Below in conjunction with accompanying drawing, describe the enforcement of technical scheme in detail.
This user who finds that described method is implemented optical-fiber network at the service management module by management plane or control plane UNI-N (User Network Interface network side) equipment is organizing on the basis of management; the light multicast mechanism that employing manages based on management plane and control plane; by multicast path by dynamic foundation; leaf node increases and deletion; link is summed up; and the method that connects one by one; can save a large amount of paths under the bigger situation of network size sets up and bandwidth; can avoid network size to increase the problems of bringing such as the wasting of resources; increase the efficient that the multicast optical-fiber network develops and manages greatly; increase service level and protection recovery capability; make the resource of operator obtain reasonable use more; reduce user cost, possessed other more advantages simultaneously.
The present invention is in the Framework Architecture of ASON, and the UNI-N node of management plane or control plane will be safeguarded multicast group, multicast member table and multicast routing table.Wherein comprised every network bandwidth that the light multicast service is applied in the multicast group, service class, protection level, ID that the adding group is required and password etc.; Each multicast member table has comprised group member's ID and password, authority, group membership address etc.; Member's multicast routing table has indicated the path of every connection, the information such as SLA constrained parameters on link capacity and every pitch chain road, and each group membership represents with the form of tree to the link address of all purpose member ports in the light multicast.
The characteristics of light multicast are to realize in same multicast group on the basis of unified security mechanism, just use, form except modal shared medium Business Stream, can also carry multiple business such as IP, can realize enterprise's interconnection easily, video conferencing, OVPN and family's streaming media service.
What the light multicast was different with traditional IP network multicast is, realize the transmission of data, must set up a light in advance connects, on each optical node, preengage corresponding resource and carry out interconnection by the signaling mechanism of GMPLS (GMPLS technology), that is to say and to set up certain passage.
In the mechanism proposed by the invention light multicast based on ASON, the source customer equipment can and the purpose client between by auto discovery mechanism, signaling mechanism or management plane Search and Orientation mechanism, learn the address of other purpose client nodes in the group, between source PE that customer equipment links to each other and purpose PE, initiate the link setup process by the GMPLS signaling mechanism then.
When certain light multicast service of a user applies, the multicast routing table of safeguarding according to control plane source end or management plane at first, calculate a service path, search the route of identical services attribute in the source node then, if same paths part is arranged, then set up multicast path by, carry out compound in initial path, just before branch node, do not carry out the reservation of resource and issue, at branch node, the expansion of carrying out network element node device cross-port connects and switches, and sets up the process of setting up that message continues new route by the path of GMPLS signaling then.In this process, the GMPLS signaling is only set up new path, and existing utilizable path does not repeat to set up, and only the forwarding of carrying out new port at branch node is switched.The prerequisite of said process is to unify to set up the unique service identification of the overall situation, has only the connection of same service attribute can reuse existing path.
Realize above-mentioned purpose, to set up a multicast group for source node based on same data source, this multicast group can realize in the multicast member group of management plane and multicast address, also can realize in the multicast group of the CE of source node or PE and multicast address.Draw a multicast table behind each member of group membership table,,, extend multicast path backward according to the form of binary tree (or tree) if having then the mode the same with the group address table set up multicast path if do not have multicast path then for empty.
Fig. 1 is the configuration schematic diagram that realizes the light multicast among the ASON.
By the method that management plane carries out the multicast group management, detailed process is:
● new user joins multicast group, lands group required ID and password by the management plane verification, finds corresponding multicast source, and adds multicast member;
● after adding the multicast group of corresponding multicast source to, trigger multicast source to the process that connects that newly adds between the access customer member;
● trigger the multicast source node device and set up process to the connection that newly adds between the access customer member, then begin calculating path by entry PE, start to the link setup process of destination node by signaling, method is at first to calculate the service path of source node to new node;
● source node PE compares the service path that calculates and the existing path in the multicast address, finds out the node of identical path and beginning branch, sends the link setup request to adjacent PE then;
● message is set up in the path that the PE of source node expands in the PE that destination interface links to each other sends by the GMPLS signaling, and for co-route, according to the strategy of reserved path, shared use is reserved resource before, does not issue; If current bandwidth etc. are undesirable, then carry out the correction of bandwidth by mechanism such as BOD;
● fill in group address table and the multicast table that is positioned at management plane after the link setup success, indicated the path and the information such as link capacity and service class of every connection;
● all set up success when the path that newly adds user member and multicast source node device, then begun to carry out the test and the monitor procedure of multicast path.
The method of carrying out the multicast group management by control plane is:
● new user wants to join the light multicast group, and the mechanism by automatic discovery finds the service source node PE that needs, and sends a signaling and joins this multicast group to this source node requirement, applies for corresponding password simultaneously;
● if new purpose user has had the password of this multicast group, and then the multicast request signaling by expansion is dealt into source node PE, and required ID of multicast group and password are landed in verification;
● if multicast source is agreed newcomer's adding, then triggers source node equipment to the new connection procedure that adds the subscriber equipment member, begins to calculate the service path of source node to new node by entry PE;
● source node PE compares the service path that calculates and the existing path in the multicast address, finds out the node of identical path and beginning branch, sends the link setup request to adjacent PE then;
● message is set up in the path that the PE of source node expands in the PE that destination interface links to each other sends by the GMPLS signaling, and for co-route, according to the strategy of reserved path, shared use is reserved resource before, does not issue; If current bandwidth etc. are undesirable, then carry out the correction of bandwidth by mechanism such as BOD.
Fig. 2 is a multicast path node processing flow process.
Connect for this multicast, link circuit resource between source PE, P node is to share for many connections, promptly the link content in a B bandwidth of P breakout upstream is duplicated into the multilink content at the P node, corresponding many branches in downstream, because the particularity of optical-fiber network, attributes such as the bandwidth of these connections, coding are all in full accord, are the handling process after source PE and P node are received Create Request below, and the step that multicast node is handled is:
● source PE and P node are received Create Request, check the legitimacy of connection request;
● connect for this multicast, link circuit resource between source PE, P node is to share for many connections, promptly the link content in a B bandwidth of P breakout upstream is duplicated into the multilink content at the P node, corresponding many branches in downstream, because the particularity of optical-fiber network, attributes such as the bandwidth of these connections, coding are all in full accord;
If ● legal then start multicast and connect;
● if this node multicast process for the first time, normal process then, reserved resource;
● if this node is a branch node, then transmits the link setup request, and this node transport layer hardware is done in the downstream and duplicated;
● otherwise transmit link setup request, shared resource.
Fig. 3 is based upon group membership's table multicast table structure afterwards, and Fig. 4 is the signaling process flow process between the node, and Fig. 5 starts the flow chart that multicast path is set up among the ASON.
Step by Fig. 4 and foundation shown in Figure 5 is:
1. increased after second member in the multicast group, as source node, initiated the process that connects to second member by first member;
2. connect to set up and finish, fill in group address table and multicast address;
3. work as the third party member and add, and ask to connect with first member, receive after the request, initiate the link setup process by first member to the 3rd member, method is the service path that at first calculates three nodes of first node to the;
4. first member CE compares the service path that calculates and the existing path in the multicast address, finds out the node of identical path and beginning branch, sends the link setup request to adjacent PE then;
5. message is set up in the path expanded in the PE that destination interface links to each other sends by the GMPLS signaling of the PE of source node,,, keeps certain resource, but does not issue according to the strategy of reserved path to the path between the B point for identical A point; If current bandwidth etc. are undesirable, then carry out the correction of bandwidth by mechanism such as BOD;
6. after request message arrival breakout B is set up in the path, to the C point, to the E point, set up new path from the C point from the B point;
7. after purpose CE port is received the message of link setup path request, if agree current setting, send acknowledge message, the PE that destination interface links to each other begins to return the resource reservation response message to source node;
8. after the resource reservation response message arrives breakout B, carry out the electricity intersection switching action of inbound port to two outbound port on the B node device, promptly a direction is carried out one 1 * 2 intersection from original inbound port to D, increases a direction to E;
9. the resource reservation response message does not issue switching action to transmitting the agency in the action that resource reservation does not take place in the process of A experience B;
10.B node sends the resource reservation response message to destination node, forwarded upstream reserving message no longer, and upstream source node is sent out a Notify message simultaneously, the success of notification source node PE equipment link setup;
11. source node PE equipment notification source port CE equipment, after receiving that successful message is set up in the path, then fill in multicast address, if middle switch can only be 1 * 2 switch, then whole multicast tree is a binary tree, and multicast address travels through according to the mode of binary tree and mates; If it is full to set up in the process 1 * 2 switch, then must set up new path; If middle switch is 1 * 4, the form that then whole multicast tree is a tree travels through and mates; Traversal that use the centre and matching algorithm are not the categories that the present invention is described.
The process that multicast path shown in Figure 6 is removed is:
When have in the multicast group member decision withdraw from or require to remove and another member between the optical channel link time, initiate to remove the process that connects by the source node of every passage to destination node respectively;
2. at first search group address table and multicast address, initiate deletion request message according to channel path by source node;
3. source node CE compares the service path that calculates and the existing path in the multicast address, finds out the node of identical path and beginning branch;
4. the deletion request message in the PE that destination interface links to each other sends by the GMPLS signaling, expanded of the PE of source node, to the path between the B point, if this multicast service also has under other situations that connect this section path, resource does not reclaim for the A point; If current bandwidth etc. has needed to adjust, then carry out the correction of bandwidth by mechanism such as BOD;
5. after deletion request message arrives breakout B, to the C point, to the E point, begin the dismounting work in path from the C point from the B point;
6. after purpose CE port is received the message of removing path request, send acknowledge message, the PE that destination interface links to each other begins to return the deletion acknowledge message to source node;
7. after the deletion acknowledge message arrives breakout B, on the B node device, carry out the electricity intersection switching action of inbound port to two outbound port, promptly be disconnected to the connection of E direction from the intersection of two original outbound ports;
8. the deletion acknowledge message action of not tearing chain open in the process of A at experience B does not issue switching action to transmitting the agency;
9. source port CE equipment is received the successful message of path dismounting, upgrades multicast address and group membership's address table.
If need not reduce a part of bandwidth at B to the A node, then send acknowledge message to PE2 from here; If delete unnecessary bandwidth, then upstream continue to send the deletion response message.
Claims (15)
1, a kind of method that realizes the realization of light multicast in ASON comprises the steps:
The unified unique service identification of the overall situation of setting up has only the connection of same service attribute can reuse existing path;
For source node is set up a multicast group based on same data source, this multicast group can realize in the multicast member group of management plane and multicast address, also can realize in the multicast group of the customer equipment equipment of source node or service provider's equipment and multicast address; Draw a multicast table behind each member of group membership table,,, extend multicast path backward according to the form of binary tree if having then the mode the same with the group address table set up multicast path if do not have multicast path then for empty;
When certain light multicast service of a user applies, at first, calculate a service path according to the multicast routing table of control plane source end or management plane maintenance;
Search the route of identical services attribute in the source node then, if same paths part is arranged, then set up multicast path by, carry out compound in initial path, just before branch node, do not carry out the reservation of resource and issue, at branch node, the expansion of carrying out network element node device cross-port connects and switches;
Set up the process of setting up that message continues new route by the path of GMPLS signaling then again, in this process, the GMPLS signaling is only set up new path, and existing utilizable path does not repeat to set up, and only the forwarding of carrying out new port at branch node is switched.
2, the method that realizes the light multicast in ASON according to claim 1 is characterized in that, in the centralized implementation based on management plane, concrete implementation step is:
(1) new user is by logging on the multicast service module of management plane, check the multicast source that search is required, required ID of corresponding multicast group and password are landed in application and verification, check this group network topology situation, add the group membership then, information such as the authority of group membership table and member port address are set;
(2) trigger the multicast source node device and set up process, begin calculating path, start to the link setup process of destination node by signaling by inlet service provider equipment to the connection that newly adds between the access customer member;
(3) source node service provider equipment compares the service path that calculates and the existing path in the multicast address, finds out the node of identical path and beginning branch, sends the link setup request to adjacent service provider's equipment then;
(4) message is set up in the path expanded in service provider's equipment that destination interface links to each other sends by the GMPLS signaling of service provider's equipment of source node, and for co-route, according to the strategy of reserved path, shared use is reserved resource before, does not issue; If current bandwidth etc. are undesirable, then carry out the correction of bandwidth by mechanism such as bandwidth on demands;
(5) after message arrival breakout is set up in the path, to setting up new path between the destination node;
(6) after purpose customer equipment device port is received the message of link setup path request, if agree current setting, send acknowledge message, service provider's equipment that destination interface links to each other begins to return RESV to source node;
(7) after RESV arrives breakout, on branch node equipment, carry out the node device intersection switching action of inbound port to two outbound port; If RESV is no longer reserved, do not issue switching action to transmitting the agency under situation about having reserved before the experience;
(9) source port customer equipment equipment is received the successful message of path foundation, send test to two destination devices, if receive correct response, then fill in the multicast address on the source node equipment and be synchronized in the multicast routing table of management plane, multicast address travels through according to the form of tree and mates.
3, the method that in ASON, realizes the light multicast according to claim 1, it is characterized in that, in implementation based on control plane, the multicast user member who looks for novelty can find source node by the mechanism of finding automatically, and directly send to the source node request by signaling and add, the multicast path that calculates destination node if source node is adhereed to by, implement the link setup process and the result added in multicast group and the multicast address.
4, the method that in ASON, realizes the light multicast according to claim 1, it is characterized in that, in implementation based on control plane, require the source end of control plane to announce with regard to the program of oneself, destination node requires the multicast tree of adding source end, must use signaling to send request, perhaps file a request to the multicast management unit of management plane.
5, the method that realizes the light multicast in ASON according to claim 1 is characterized in that, is realizing in the light multicast mode that by control plane concrete implementation step is:
(1) new user wants to join the light multicast group, finds the service source node service provider equipment that needs by auto discovery mechanism or route flooding mechanism, sends a signaling and joins this multicast group to this source node requirement, applies for corresponding password simultaneously;
(2) if new purpose user has had the password of this multicast group, then the signaling of landing by expansion is dealt into source node service provider equipment, and required ID of multicast group and password are landed in verification;
(3) if source node equipment allows newcomer's equipment to add the light inlet multicast group, then trigger the process of inlet service provider calculation of equipments service path, start to the link setup of destination node by signaling;
(4) source node service provider equipment compares the service path that calculates and the existing path in the multicast address, finds out the node of identical path and beginning branch, sends the link setup request to adjacent service provider's equipment then;
(5) message is set up in the path expanded in service provider's equipment that destination interface links to each other sends by the GMPLS signaling of service provider's equipment of source node, and for co-route, according to the strategy of reserved path, shared use is reserved resource before, does not issue; If current bandwidth etc. are undesirable, then carry out the correction of bandwidth by mechanism such as bandwidth on demands;
(6) after message arrival breakout is set up in the path, to setting up new path between the destination node;
(7) after purpose customer equipment device port is received the message of link setup path request, if agree current setting, send acknowledge message, service provider's equipment that destination interface links to each other begins to return RESV to source node;
(8) after RESV arrives breakout, on branch node equipment, carry out the node device intersection switching action of inbound port to two outbound port; If RESV is no longer reserved, do not issue switching action to transmitting the agency under situation about having reserved before the experience;
(9) source port customer equipment equipment equipment is received the successful message of path foundation, send test to two destination devices, if receive correct response, then to fill in the multicast member table on the source node equipment and be synchronized in the multicast routing table, multicast address travels through according to the form of tree and mates.
6, according to each described method that in ASON, realizes the light multicast in the claim 1 to 5, it is characterized in that the multicast route calculation comprises based on multiple constraints:
(1) when setting up shortest path, the one, the shortest to the jumping figure between the destination node, the 2nd, newly-built path is the shortest, promptly utilizes the path of having set up to greatest extent, can use existing access path by searching original multicast routing table as far as possible;
(2) multicast path that calculates optical-fiber network can add the constraint of explicit path or node by the requirement that will satisfy link bandwidth and port ability.
7, according to each described method that in ASON, realizes the light multicast in the claim 1 to 5, it is characterized in that the protection of backbone route and recovery level can not be lower than to the protection of any one destination node multicast path and recovery level.
8, according to each described method that in ASON, realizes the light multicast in the claim 1 to 5, it is characterized in that, multicast member can dynamically add or leave the multicast tree that has existed, and do not influence already present multicast service, so when the connection that the deletion leaf node withdraws from, can not have influence on the required connection of other leaf node.
9, according to each described method that in ASON, realizes the light multicast in the claim 1 to 5, it is characterized in that, increase bandwidth if desired, then need to hold consultation, revise the link bandwidth of compound path with source node.
10, according to each described method that in ASON, realizes the light multicast in the claim 1 to 5; it is characterized in that; if new path requires to revise grade of service convention rank; if strategy allows; then on the basis of original link, start the requirement of protection and restoration path; if link setup request afterwards is lower than current requirement, then keep existing link.
11, according to each described method that in ASON, realizes the light multicast in the claim 1 to 5, it is characterized in that, when tearing chain open, client member's customer equipment equipment sends the dismounting connection process by the GMPLS signaling to the service provider's equipment end that links to each other, and the path deletion message that sends the GMPLS signaling mechanism is to each destination node service provider equipment; If belong to multicast path between some node of link, then this section link keeps; If source node the member withdraw from, then send path deletion message to all multicast members.
12, according to each described method that in ASON, realizes the light multicast in the claim 1 to 5, it is characterized in that, be the requirement of route mechanism:
Calculating section at the multicast routing tree, by the routing module control centralized calculation multicast path of source node by, going out one according to topology of networks and multicast service property calculation is that root, destination node are the multicast tree of leaf with the source node, and calculate source node to unique source routing of each leaf node, the structure of tree and route record in multicast routing table, and are fed back to management plane and manage in order to inquiry and multicast service.
13, the method that in ASON, realizes the light multicast according to claim 12, it is characterized in that, the structure of multicast routing algorithm adopts from the tree trunk and calculates multicast tree to increasing a cumulative big process of the tree that increases leaf based on shortest path first, specifically comprises the steps:
At first calculate the backbone route that a destination node that starts multicast service arrives source point, the information of record node wherein; Add when calculating as other destination node, the intermediate node when calculating the optimum route of this destination node each node in backbone route also calculates the multicast path of root.
14, according to each described method that in ASON, realizes the light multicast in the claim 1 to 5, it is characterized in that, be the requirement of signaling mechanism:
The GMPLS signaling protocol runs through and operates in uni interface and network internal, is established to the source routing of the point of each leaf node to multiple spot from source node; For multicast service, in signaling message, use the unique multicast group id of the overall situation to identify the business that belongs to same multicast distribution tree and connect.
15, the method that realizes the light multicast in ASON according to claim 14 is characterized in that,, handles according to following manner when the connection of leaf node is set up in process source:
When the signaling paths that carries same multicast ID service identification is set up message through each node, application time slot label, judge whether other connection of same multicast service, if other that can not find out same multicast service when this node is reserved distributing labels connects, think that then the node that the message process is set up in the path do not setting up on the path, processing procedure is the same with setting up the general service path;
If other that can find same multicast service when distributing labels connects, then think the path set up message through point also on other of same multicast service connect, judge further whether the outgoing link of this connection identical with the existing outgoing link that is connected;
If the outgoing link that the outgoing link that other connection of same multicast service is used connects therewith is inequality, think that then this node is bifurcation, will connects for this reason and distribute new label, when message is set up in these paths to each leaf node, the RESV of replying also carries out the inspection of interconnection conversion respectively when returning, and sign successful connection when source node.
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