CN101453413A - Method and apparatus for automatic topology discovery and resource management in PBB network - Google Patents
Method and apparatus for automatic topology discovery and resource management in PBB network Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04L47/00—Traffic control in data switching networks
- H04L47/70—Admission control; Resource allocation
- H04L47/82—Miscellaneous aspects
- H04L47/822—Collecting or measuring resource availability data
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/50—Routing or path finding of packets in data switching networks using label swapping, e.g. multi-protocol label switch [MPLS]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
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- H04L47/70—Admission control; Resource allocation
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Abstract
The invention discloses a method for automatic topology discovery and resource information management in a Provider Backbone Bridging Traffic Engineering (PBB TE) network. A first network node constructs an Intermediate System to Intermediate System (IS-IS) Hello message containing network topology information or an IS-IS Link State Affirm (LSA) message containing resource information, and transmits the message in the PBB TE network; and a second network node receives the message and records the network topology information or the resource information in the message to a local network topology information database or a resource information database. The invention also discloses a PBB TE network node device. The proposal of the method can achieve the automatic topology discovery and the resource information management in the PBB TE network.
Description
Technical field
The present invention relates to technical field of the computer network, automatic topological discover and resource management method and device in particularly a kind of provider backbone bridging (Provider Backbone Bridge Traffic Engineering, PBB TE) network.
Background technology
Because PBB TE is based on PBB's, at first introduce PBB here.PBB says to be exactly Mac-in-Mac with popular words, promptly by encapsulate one deck medium access control (MAC) address again before common Ethernet (Ethernet) frame, is called the backbone layer address, thereby makes station address and operator address realize separating.Can guarantee so on the one hand the independence of managing also can improve service security on the one hand, can significantly reduce the size of backbone layer equipment MAC table simultaneously, the complexity that reduction equipment is realized.In the PBB network, traditional point-to-point can be provided, put multiple spot, multiple spot is to the ether business of multiple spot, and (Multiple Spanning TreeProtocol MSTP) determines forward-path according to the multichannel Spanning-Tree Protocol.Wherein the MSTP agreement divides the territory to calculate forwarding generation tree according to B-VLAN, and different B-VLAN territories is generated different forward-paths.
PBB traffic engineering (Traffic Engineering, TE) be Nortel propose in Ethernet, establish the ethernet channel that is connected with backbone layer VLAN (B-VLAN) and transmit the tunnel as business based on port backbone layer medium access control (B-MAC), can carry a plurality of PBB business on the PBB traffic engineering tunnel.
In the standardisation process of existing P BB TE, be to guarantee Bandwidth Management and consider that creating a mechanism of main PBB traffic engineering tunnel is method by static configuration from the complexity that realizes.In the network design of static configuration tunnel or reality, need know whole PBB TE network topology and network resource status in advance, so that can satisfy real business demand.In existing P BB TE scheme, can only be hand-kept topological sum resource information in the on-premise network process, so that use during the configuring static tunnel.Static network management configuration realizes simple, but the collection PBB TE network topology of neither one intelligence and the scheme of resource information, rely on the topological sum resource information that writes down PBB TE network when disposing by artificial method fully, not only workload increases, and also brings the possibility of configuration error.
The PBB traffic engineering tunnel is except that crossing static configuration, and industry also tentatively proposes to adopt dynamic GMPLS signaling to finish.GMPLS is the mechanism that a kind of tunnel is set up, and it is based on existing topology information and resource information is set up the forwarding tunnel in the network of regulation, is used to carry miscellaneous service.But in the prior art, use GMPLS to create a mechanism at PBB TE network as the PBB traffic engineering tunnel, still the collect means that does not have topology information and resource information, the topology information of manual record and resource information are as the input of GMPLS signaling protocol in the time of can only leaning on network design.
Summary of the invention
In view of this, the embodiment of the invention proposes the method for automatic network Topology Discovery in a kind of provider backbone bridging traffic engineering PBB TE network, comprises the steps:
First network node structure comprises the Intermediate System-to-Intermediate System IS-ISHello message of network topological information, and sends described message in PBB TE network;
Second network node receives the described IS-IS hello packet that comprises network topological information, and the network topological information in the described message is recorded in the local topology information database.
The embodiment of the invention proposes the method for a kind of PBB TE resources in network information management again, comprises the steps:
First network node judges whether the network state of PBB TE changes, if then structure comprises the IS-IS link state packets LSP message of resource information, and other node sends described message in network;
Second network node receives the described IS-IS LSP message that comprises resource information, and the resource information in the described message is recorded in the local resource information database.
The embodiment of the invention also proposes a kind of PBB TE network node device, comprises being used for carrying out mutual interface with other network node, also comprises:
Topology information database is used to store the network topological information of being received;
The network topological information receiver module is used for extracting network topological information, and described network topological information being sent to described topology information database from the IS-IS hello packet of described node interface reception;
The network topological information sending module is used for adding the network topological information of this node to will send to other network node IS-IS hello packet, and sends the PBB TE node of described IS-IS hello packet to the opposite end.
The embodiment of the invention also proposes another kind of PBB TE network node, comprises being used for carrying out mutual interface with other network node, also comprises:
Resource information database is used to store the resource information of being received;
The resource information receiver module is used for extracting resource information, and described resource information being sent to described resource information database from the IS-IS LSP message of described node interface reception;
The resource information sending module is used for adding the resource information of this node to will send to other network node IS-IS LSP message, and sends the PBB TE node of described IS-IS LSP message to the opposite end.
As can be seen from the above technical solutions, by the double layer network agreement is expanded, can be implemented in the collection that realizes automated topology information and resource information in the PBB TE network, thereby the foundation to the PBB traffic engineering tunnel provides sufficient information, be the assurance of the QoS of business, the deployment of TE all has great importance and acts on.
Description of drawings
Fig. 1 realizes the transmitting terminal process chart of collecting network topology information for first embodiment of the invention;
Fig. 2 realizes the receiving terminal process chart of collecting network topology information for second embodiment of the invention;
Fig. 3 realizes the transmitting terminal process chart that resource information is collected for third embodiment of the invention;
Fig. 4 realizes the receiving terminal process chart that resource information is collected for fourth embodiment of the invention;
Fig. 5 realizes the network node structure block diagram of collecting network topology information for fifth embodiment of the invention;
Fig. 6 realizes the network node structure block diagram that resource information is collected for sixth embodiment of the invention.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, the present invention is further elaborated below in conjunction with accompanying drawing.
The embodiment of the invention is passed through Intermediate System-to-Intermediate System (Intermediate System toIntermediate System, IS-IS) expansion of agreement, make PBB TE network node can pass through the Intermediate System to Intermediate System message, collect the topology information and the resource information of other node in the PBB TE network, as tunnel configuration in the PBB TE network or the foundation when setting up automatically.
Intermediate System to Intermediate System is a kind of procotol based on two layers, is used for discovering network topology, and network resource information is collected, and the calculating of data forwarding paths.Intermediate System to Intermediate System comprises three kinds of protocol massages:
1) hello packet is used to find neighbor node;
2) link state packets (Link State Packets, LSPs) message is used to exchange link-state information;
3) (Sequence Number Packets, SNPs) message are used to guarantee the real-time of link-state information guarantee that the link-state information between adjacent node is synchronous in sequence number grouping.
Wherein, hello packet is divided into three kinds, it is respectively Hello grouping (Level1LAN IS to IS Hello Packet) message of one deck local area network (LAN) Intermediate System-to-Intermediate System, Hello grouping (Level2LAN IS to IS Hello Packet) message of two layers of local area network (LAN) Intermediate System-to-Intermediate System, point-to-point Intermediate System-to-Intermediate System Hello grouping (Point-to-Point IS to IS Hello Packet) message.The LSPs message is divided into two kinds, is respectively one deck link state packets (Level1 Link State Packets) message, two layers of link state packets (Level2Link State Packets) message.The SNPs message is divided into four kinds, it is respectively one deck full sequence numbers grouping (Level1Complete Sequence NumbersPackets) message, two layers of complete sequence grouping (Level 2Complete Sequence Numbers Packets) message, one deck partial sequence number grouping (Level1Partial Sequence Numbers Packets) message and two layer segment sequence numbers grouping (Level 2Partial Sequence Numbers Packets) message.Partial sequence number grouping (Partial Sequence Number Pakcets) message comprises the up-to-date LSPs information of part in the node uplink information database in (comprising one deck partial sequence number grouping message and two layer segment sequence numbers grouping message), full sequence numbers grouping (Complete Sequence NumbersPackets) message (comprising one deck full sequence numbers grouping message and two layers of full sequence numbers grouping message) then comprises the whole up-to-date LSPs information in the node uplink information database.
For collection network topology information and link-state information in PBB TE, make full use of the attribute that IS-IS is easy to expand, the embodiment of the invention is by TLV, and promptly the form of Type-Length-Value increases the association attributes of PBB TE network.TLV form among the IS-IS is as shown in table 1:
| Type (1 octets) |
| Length (1 octets) |
| Value (variable octets) |
Table 1
For making the Intermediate System to Intermediate System autgmentability better, defined in RFC3874 (IS-IS TE expansion) and existingly in the new TLV substitute I S-IS agreement be used to transmit the TLV (IS Neighbor TLV) of neighbor information and the TLV (IP Reachability TLV) of IP reachability information, described new TLV is as shown in table 2:
| Type | Describe | IIH | LSP | SNP |
| 22 | Expansion IS accessibility TLV | Not | Be | Not |
| 134 | Traffic engineering Router Distinguisher TLV | Not | Be | Not |
| 135 | Expansion IP reachability TLV | Not | Be | Not |
Table 2
In TLV separately, can comprise relevant sub-TLV (Sub-TLV) again,, comprise Sub-TLV as shown in table 3 as in expansion IS accessibility (The extended IS reachability) TLV.
| Type | Describe |
| 0-2 | Unallocated (unassigned) |
| 3 | Management group (Administrative group) |
| 4-5 | Unallocated |
| 6 | IPv4 interface IP address (IPv4 interface address) |
| 7 | Unallocated |
| 8 | IPv4 neighbours address (IPv4 neighbor address) |
| 9 | Maximum link bandwidth (Maximum link bandwidth) |
| 10 | Keep link bandwidth (Reservable link bandwidth) |
| 11 | Reserved bandwidth (Unreserved bandwidth) not |
| 12-17 | Unallocated |
| 18 | TE default parameters (TE Default metric) |
| 19-254 | Unallocated |
| 255 | Wait until expansion in the future |
Table 3
The embodiment of the invention adopts following extended method at PBB TE to Intermediate System to Intermediate System:
1) in hello packet, directly carry PBB TE address information with the TLV form, be used for topology information collection.
In hello packet, increase following TLV:
Category-B MAC Address and whether support PBB TE agreement (B-MAC and if PBB TE Protocolsupported), as shown in table 4, be used to describe the B-MAC of the port correspondence, whether this port supports PBB TE.
| Type (134 or other retention that does not conflict) |
| (each address field length is 7 octets to length for 1 octet, the length of address field.) |
| B-MAC(6 octets) |
| Pbb te Supported(1 octets) |
Table 4
2) distribute a TLV (PBB TE Attributes TLV) who is used to transmit PBB TE attribute, perhaps utilize expansion IS accessibility (the The Extended IS Reachability) TLV that defines among the RFC3784 as carrier, the information that PBB TE is relevant is added among the expansion IS accessibility TLV in the mode of Sub-TLV, collects PBB TE resource information in the PBB TE network thereby be implemented in.
In the LSPs message, increase following Sub TLV:
The structure of PBB TE traffic engineering information (Traffic Engineering Information) is as shown in table 5, is used to describe corresponding attribute of port and traffic engineering relevant information.
| Subtype (value of not conflicting with existing standard) |
| Length (1 octet) |
| Sub-TLV |
Table 5
Wherein Sub-TLV can comprise option as shown in table 5, and wherein subtype 1 and 2 is essential option, and other subtype is option.
| Subtype (Sub-Type) | Length | Describe |
| 1 | 6 octets | B-MAC |
| 2 | 1 octets | Support PBB TE (Pbb te Suported) |
| 3 | 2 octets | Protection type 0 x 00: do not protect 0 x 01:1+1 to protect 0 x 02:1:1 to protect 0 x 04: other value of share protect: to keep |
| 4 | 2 octets | The MTU of port (MTU) |
| 5 | 4 octets | PBB TE available bandwidth |
| 6 | 2 octets | PBB TE delay parameter |
Table 5
Delay parameter (Delay Metric) is a relative notion, sets according to the support situation of system.If do not support, must be changed to 0.
Concrete bandwidth (Bandwidth) value can be as shown in table 6.
Table 6
The transmission of all Intermediate System to Intermediate System messages and receive rules all according to the regulation of former agreement.
The PBB TE network topological information message transmission flow of first embodiment of the invention comprises the steps: as shown in Figure 1
Step 101: transmitting terminal carries out the Intermediate System to Intermediate System initialization, and obtains the network topological information of self, comprise the B-MAC address of the port of self, and whether port supports PBB TE.
Step 102: transmitting terminal timed sending IS-IS hello packet, described hello packet carries the network topological information of transmitting terminal.
The message of the PBB TE Topology Discovery of second embodiment of the invention receives flow process as shown in Figure 2, comprises the steps:
Step 201: receiving terminal carries out the Intermediate System to Intermediate System initialization;
Step 202: receiving terminal receives the IS-IS hello packet, and described hello packet carries the network topological information of transmitting terminal;
Step 203: receiving terminal records the network topological information in the hello packet of being received in the local topology information database.
The PBB TE resource information message transmission flow of third embodiment of the invention comprises the steps: as shown in Figure 3
Step 301: transmitting terminal judges whether the network state of PBB TE changes, if then execution in step 302, otherwise execution in step 301 still.
Step 302: according to the situation of change of PBB TE network, structure IS-IS LSP message carries PBB TE resource information in the described IS-IS LSP message,, and will construct the IS-IS LSP message of getting well and send.Described resource information comprises: the combination in any of the protection type of port, the MTU of port, PBBTE available bandwidth, PBB TE delay parameter or foregoing.Described PBB TE resource information can be carried at and be exclusively used among the TLV that transmits PBB TE attribute, perhaps adds among the expansion IS accessibility TLV in the mode of Sub-TLV
The PBB TE resource information message of fourth embodiment of the invention receives flow process as shown in Figure 4, comprises the steps:
Step 401: receiving terminal receives IS-IS LSP message;
Step 402: receiving terminal upgrades local resource information bank according to the PBB TE information in the described LSP message.
The PBB node of the realization collecting network topology information that fifth embodiment of the invention proposes comprises being used for carrying out mutual interface with other network node as shown in Figure 5, also comprises:
Collecting network topology information module 502 is used for extracting network topological information, and described network topological information being sent to described topology information database 501 from the IS-IS hello packet of described node interface reception.
Network topological information sending module 503 is used for adding the network topological information of this node to will send to other network node IS-IS hello packet.Can comprise a transmission timer in the network topological information sending module 1203,, then construct and send the IS-IS hello packet whenever transmission timer is overtime, and this transmission timer of resetting, can the Control Network topology information realize timed sending like this.
The PBB node that the realization resource information that sixth embodiment of the invention proposes is collected comprises being used for carrying out mutual interface with other network node as shown in Figure 6, also comprises:
Resource information collection module 602 is used for extracting resource information, and described resource information being sent to described resource information database 601 from the IS-IS LSP message of described node interface reception.
Resource information sending module 603 is used for adding the resource information of this node to will send to other network node IS-IS LSP message.
Above embodiment is to be example with the Intermediate System to Intermediate System, and reality also can similarly be expanded other double layer network agreements, realizes the present invention program.The scheme that the embodiment of the invention provides, can in the PBBTE network, realize the collection of automated topology information and resource information, thereby the foundation to the PBB traffic engineering tunnel provides sufficient information, is the assurance of the QoS of business, and the deployment of TE all has great importance and acts on.
The above only is preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of being done within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1, the method for automatic network Topology Discovery in a kind of provider backbone bridging traffic engineering PBB TE network is characterized in that, comprises the steps:
First network node structure comprises the Intermediate System-to-Intermediate System IS-ISHello message of network topological information, and sends described message in PBB TE network;
Second network node receives the described IS-IS hello packet that comprises network topological information, and the network topological information in the described message is recorded in the local topology information database.
2, method according to claim 1 is characterized in that, described network topological information comprises the port backbone layer medium access control B-MAC address of described other network nodes and the indication whether described node supports PBB traffic engineering TE.
3, method according to claim 1 is characterized in that, described first network node structure comprises the double layer network protocol massages of network topological information, and the described message of transmission comprises in PBB TE network:
First network node starts transmission timer, and overtime when transmission timer, then structure comprises the double layer network protocol massages of network topological information, and other node sends described message in network.
4, the method for a kind of PBB TE resources in network information management is characterized in that, comprises the steps:
First network node judges whether the network state of PBB TE changes, if then structure comprises the IS-IS link state packets LSP message of resource information, and other node sends described message in network;
Second network node receives the described IS-IS LSP message that comprises resource information, and the resource information in the described message is recorded in the local resource information database.
5, method according to claim 4 is characterized in that, described resource information comprises:
The combination in any of the port protection type of network node, the MTU MTU of port, available bandwidth, PBBTE delay parameter or above content.
6, a kind of PBB TE network node device comprises being used for carrying out mutual interface with other network node, it is characterized in that, also comprises:
Topology information database is used to store the network topological information of being received;
The network topological information receiver module is used for extracting network topological information, and described network topological information being sent to described topology information database from the IS-IS hello packet of described node interface reception;
The network topological information sending module is used for adding the network topological information of this node to will send to other network node IS-IS hello packet, and sends the PBB TE node of described IS-IS hello packet to the opposite end.
7, network node device according to claim 6 is characterized in that, described network node also comprises:
Resource information database is used to store the resource information of being received;
The resource information receiver module is used for extracting resource information, and described resource information being sent to described resource information database from the IS-IS LSP message of described node interface reception;
The resource information sending module is used for adding the resource information of this node to will send to other network node IS-IS LSP message, and sends the PBB TE node of described IS-IS LSP message to the opposite end.
8, a kind of PBB TE network node device comprises being used for carrying out mutual interface with other network node, it is characterized in that, also comprises:
Resource information database is used to store the resource information of being received;
The resource information receiver module is used for extracting resource information, and described resource information being sent to described resource information database from the IS-IS LSP message of described node interface reception;
The resource information sending module is used for adding the resource information of this node to will send to other network node IS-IS LSP message, and sends the PBB TE node of described IS-IS LSP message to the opposite end.
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| CNA2007101952191A CN101453413A (en) | 2007-12-04 | 2007-12-04 | Method and apparatus for automatic topology discovery and resource management in PBB network |
| PCT/CN2008/073293 WO2009074093A1 (en) | 2007-12-04 | 2008-12-02 | Method and apparatus for finding topology and managing resource automatically in the pbb network |
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| CN105591937B (en) * | 2015-09-30 | 2018-12-25 | 新华三技术有限公司 | A kind of acquisition method and equipment of network topological information |
| CN113810297A (en) * | 2021-09-15 | 2021-12-17 | 中国铁道科学研究院集团有限公司 | Multi-network converged train network system and communication method thereof |
| CN116319507A (en) * | 2023-03-31 | 2023-06-23 | 西安电子科技大学 | Dynamic real-time network cloud resource fine granularity sensing and interaction system and method |
| CN116319507B (en) * | 2023-03-31 | 2024-03-29 | 西安电子科技大学 | Dynamic real-time network cloud resource fine granularity sensing and interaction method |
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