CN100450063C - Multi-ring interconnect transmission method of resilient packet ring based on loop identifier router - Google Patents
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Abstract
The invention relates to one spring set division ring and multiple ring transmission method based on ring label router, which comprises the following steps: a, setting multiple ring RPR network sub ring switch with each one aligned with one different ring label; b, the network transmission set has two types with sub ring sends set and overlap set; c, for overlap frame, inserting several bits before initial parts as extensive definition section and writing the bit total number into TTL section; d, overlap control section stores first bit to define current sub ring aim point number to represent its network exit time.
Description
Technical field
The present invention relates to that a kind of (Resilient Packet Ring RPR) realizes the interannular grouping method of transmission mutually in the tangent network that connects and composes, belong to Communication and Information Systems class network transmission technology field in a plurality of Resilient Packet Ring.
Background technology
Resilient Packet Ring is a kind of technology of MAN, purpose is to adopt a kind of brand-new packet bearer technology to optimize the transmission of packet on the ring topology, it has absorbed the economy of gigabit Ethernet and the reliability of SDH, adopt the topological structure of reciprocal pair of Optical Fiber Transmission ring, two optical fiber outer shrouds clockwise and interior ring counterclockwise can transmit data or control grouping simultaneously, so the bandwidth availability ratio of network increases.Also adopt space huge profit usefulness, APS, automatic topological discover in addition, service classification is not served and new technology such as bandwidth resources dynamic assignment improves the resource utilization of looped network.
" IEEE Standards 802.17 Part 17:Resilient packet ring (RPR) accessmethod and physical layer specifications " RPR technical standard was formulated by IEEE802.17WG in September, 2004, be a kind of, aim at the new mac-layer protocol of optimizing data packet transmission and proposing towards pure ring (monocycle) Network Transmission.Its application only is confined to monocycle, can't realize that the end-to-end bandwidth of transannular business is shared, fairness mechanism, QoS and defencive function.When the last node of ring increases, the structure of pure ring will be unfavorable for the raising of bandwidth availability ratio.Therefore, IEEE802.17WG put into effect " IEEE Standards802.17a Media Access Control (MAC) Bridges Amendment 1:Bridging of IEEE802.17 " again the mac-layer protocol that provides was before replenished in October, 2004, bridging technology by the MAC layer, the RPR Data Bridge in the network of other RPR networks even other IEEE 802 series, is realized the transannular transmission of Frame by IEEE 802.1d Spanning-Tree Protocol.But because this type of bridge joint scheme is to carry out addressing by the mode with flooded broadcast between looped network, each node all needs copied data frames, and this will cause very big load to network, also will hinder space huge profit giving full play to technical advantage.
Summary of the invention
Technical problem: the purpose of this invention is to provide a kind of Resilient Packet Ring multiple ring interconnection transmission method based on ring sign route, this method is passed through with the tangent connection of a plurality of small-scale RPR subrings, cover many ring RPR networks that original large-scale RPR ring constitutes, reduce the scale of the pure loop network of RPR, the mean allocation bandwidth that solves the pure ring of RPR increases with number of nodes and the problem that descends, the total number that simultaneously can effectively expand the RPR network node advances the application of RPR to wide area network and Access Network.
Technical scheme: the present invention proposes a kind of many ring RPR interannular transmission methods based on ring sign route, distributes a definite ring identification number for each subring in the multi-ring networks; Under the condition of compatible and the standard of support RPR packet format, give expanded definition to the part field, the transannular transmission frame format that constitutes, only just can clearly distinguish in the ring and the outer grouping of ring by first bit, and can be according to the identification number of the subring that strides across from source node to the destination node needs, realize the transannular transmission of data easily, solved two layers of addressing issue between many ring RPR network rings.
Stipulating, the present invention encircling between the subring in the RPR networks by tangent interconnection more, allow in each subring ring the node sum that inserts to reduce half, thereby the higher bit that can utilize 8 bits " TTL " field that defines in the primary standard frame is as the indication of the whether transannular transmission of dividing into groups than 255 nodes of standard RPR.Defining the node that is positioned in the multiple ring interconnection network on the points of tangency simultaneously is cross connection node, is responsible for the processing of transannular frame, realizes transannular addressing and transmission.Other node is a standard nodes, is responsible for the processing of RPR standard frame, finishes transmission and the control of subring internal standard RPR.For each node, detect the first bit of the grouping of process and can judge whether this grouping needs the transannular transmission.If need the transannular transmission, each standard nodes can no longer be done any processing to this grouping, directly straight-through the transmission.Like this, in reducing to encircle, in each standard nodes load, also can improve the transannular transmission performance of grouping.The present invention is by " transannular control " field of expanded definition, utilize inverted order to arrange grouping arrives needs each subring of process in the destination node process ring identification number, route to each grouping of interannular transmission is described, and has realized being grouped in the transmission of a plurality of RPR interannulars with less expense.
The key technology that the present invention realizes is as follows:
(1) between the subrings in the many rings of the regulation RPR networks by tangent interconnection.Each RPR subring distributes a different ring identification number.Consider the reasonability of network size, the present invention gets ring and is designated a byte, and the subring number that allows tangent interconnection is 255.Method of the present invention is equally applicable to the network of multibyte ring sign.
(2) grouping of transmitting in many ring RPR networks has two classes: the grouping (hereinafter to be referred as the transannular grouping) of grouping of transmission in the subring (hereinafter to be referred as grouping in the ring) and transannular transmission; Form (frame) with regulation during transmitted in packets occurs; Transannular is grouped in carries out compatible extensions definition on the RPR standard frame basis, get its first bit as transannular transmission indication XI.XI=' 0 ', this frame is a standard frame, is used for the subring internal transmission; XI=' 1 ' shows the transannular frame of this frame for expansion, is used for the transannular transmission.
(3) to the expansion frame of transannular transmission, before stem CRC, insert adjustable length some bytes, as " transannular control " field of expanded definition.And the cross connection node sum in the current place subring of will dividing into groups writes " TTL " field, prevents that erroneous frame from forming endless loop in subring.Have only cross connection node just to handle the transannular frame, therefore " transannular control " field is inserted RPR standard frame stem, partly place stem to keep the RPR addressing, with the irrelevant characteristics of load.In transmission course, each node only need be handled stem like this, recomputates the CRC of stem, and can not relate to the load part of back, therefore can obviously shorten the processing time.
(4) first byte of " transannular control " field (seeing accompanying drawing 4) is deposited " transannular progression ", indicates grouping and arrives the subring number that destination node place subring need stride across by the subring of current place, represents its network lifetime.Second byte of " transannular control " field begins the ring sign addressing route for the length dynamic change, and inverted order discharging grouping arrives the ring identification number that needs each subring of process in the destination node process.The purpose of inverted order is for the ease of peeling off the identification number of the subring of having passed through step by step, and when grouping arrives the subring of destination node place, the transannular control section of expansion frame will all be stripped from, and packet recovery is the RPR standard frame format.
On the basis of the above, the concrete steps of the transannular transmission of a grouping of realization are as follows:
The first step: node is received a grouping, at first judges that according to the frame format of this grouping whether it is the transannular grouping, judges promptly whether first bit of this grouping is " 1 ".Be " 1 ", and node is cross connection node, then changed for second step over to; Node is a standard nodes, does not then deal with, and directly transmits.Be not " 1 ", and node is cross connection node, then do not deal with, directly transmit; Node is a standard nodes, then handles according to standard RPR method, finishes transmission course.
Second step: whether the stem CRC that judges grouping is correct, if incorrectly then abandon this grouping; If correct, judge further whether " TTL " value is " 0 ", if " 0 " also abandons this grouping; Be not " 0 " to continue to judge whether " the transannular progression " of grouping is " 0 ", if " 0 " also abandons this grouping, is not " 0 ", changes for the 3rd step over to.
The 3rd step: the identification number of the next subring whether the ring identification number (byte in stem CRC front) of judging current addressing route connects with this node is identical.If inequality, " TTL " value is subtracted one, recomputate the stem CRC of grouping, in the subring of the former transmission of grouping, transmit grouping by former transmission direction; If identical, then changed for the 4th step over to.
The 4th step: peel off the ring identification number (deleting this byte) of current addressing route, simultaneously " transannular progression " is subtracted one, and whether judged result is " 0 ".If be not " 0 ", the cross connection node sum in the next subring is write " TTL " field, changed for the 5th step over to; If " 0 " then deletes " transannular control " field, and checks in " TTL " value by the standard topology slip condition database in next subring, insert first byte of grouping, the first bit reset of will dividing into groups simultaneously makes it be transformed into the RPR standard frame format, changes for the 5th step then over to.
The 5th step: recomputate the stem CRC of grouping, that subring tangent with former transmission subring sent in grouping, continue transmission.If the form of grouping has become the RPR standard frame, then, can finish transmission easily according to the target MAC (Media Access Control) address of its stem.
Description of drawings
Fig. 1 is one the 6 tangent many ring RPR networks that are interconnected into of subring.
Fig. 2 (a) is standard RPR " ring control " field, and Fig. 2 (b) is " ring control " field that the present invention proposes.
Fig. 3 is the RPR transannular transmission frame format of expanded definition.
Fig. 4 is the description to the RPR transannular transmission frame format stem of ring sign addressing.
Fig. 5 is the description to " transannular control " field situation of change in the RPR transannular transmission course of ring sign addressing.
Embodiment
Fig. 1 is one the 6 tangent many ring RPR networks that are interconnected into of subring.Each subring have one the ring identification number, as the subring among the figure 1,2 ..., 6; The node that connects two subrings simultaneously is a cross connection node, as shown in the figure; Other node is a standard RPR node.
Fig. 2 (a) is standard RPR " ring control " field, Fig. 2 (b) is " ring control " field that the present invention proposes, both differences are in " TTL " field, standard be 8 bits, the present invention has then used wherein 7 bits, and the highest 1 bit expanded is defined as transannular indication XI, and when XI=1, this field is a life span in the current subring of transannular frame, and its numerical value is the cross connection node sum in the subring.
Fig. 3 is the RPR transannular transmission frame format of expanded definition, and wherein the height ratio of ring control is specially for " 1 ", and inserts adjustable length some bytes before stem CRC, as " transannular control " field." transannular control " field is inserted stem, can keep the RPR addressing partly to place stem, with the irrelevant characteristics of load.In transmission course, each node only need be handled stem like this, recomputates the CRC of stem, and can not relate to the load part of back, therefore can obviously shorten the processing time.
Fig. 4 is the description to the RPR transannular transmission frame format stem of ring sign addressing, provides when being transferred to node 5 in the subring 4 when dividing into groups by the node in the subring 56 concrete form of transannular transmission frame format stem.
Fig. 5 is the description to " transannular control " field situation of change in the RPR transannular transmission course of ring sign addressing, provides when being transferred to node 5 in the subring 4 when dividing into groups by the node in the subring 56 the concrete change procedure of " transannular control " field.
The present invention stipulates more than one that ring RPR network is that subring by a plurality of tangent interconnection constitutes, as shown in Figure 1.Node on each RPR ring all has the branch of standard nodes and cross connection node.Standard nodes can realize upward encircling, encircling, transmit, abandon down of Frame, and cross connection node does not produce Frame, only finishes the forwarding of Frame and abandons operation.Cross connection node can comprise two MAC modules, belongs to two tangent subrings, and back-to-back joining is so that realize the exchange of data at intra-node.In the process of multi-ring networks automatic topological discover, the Topology Discovery of ring internal standard RPR produced the standard topology slip condition database in the ring under two MAC modules of each cross connection node were finished separately respectively earlier, participated in the transannular automatic topological discover then.Transannular automatic topological discover mechanism mainly is in order to help to be based upon the ring sign route of many ring interannulars transmission.In this process, the topological state of all network portions that can touch under two MAC modules in the cross connection node write down separately respectively on the ring direction, and realization information sharing each other, realize that with less expense the topology information of the network overall situation is collected.
The present invention compresses the scale of RPR looped network monocycle, interstitial content in each RPR subring is no more than 128, therefore the higher bit of 8 bits " TTL " field that defines in the primary standard frame also be the higher bit always ' 0 ' of whole group, but hardware default is carried out according to ' 0 '.The present invention then utilizes this bit, and (XI=' 0 ' represents that this frame need not the transannular transmission as the indication XI whether transannular transmits that divides into groups, XI=' 1 ' represents that then the destination node of this frame is not at this ring), give clear and definite differentiation to the first bit that is grouped in each grouping that transmits with transannular in encircling.Thereby for each node, first bit of each grouping of process promptly indicates the destination node of this grouping whether in ring on it, if this bit is ' 1 ', each ordinary node can no longer be done any processing to this grouping, directly straight-through the transmission, like this, in reducing to encircle, in each ordinary node load, also can improve the transmission packets performance.And, then before " the stem CRC " of standard RPR frame field, insert some bytes for other addressing relevant informations, be defined as " transannular control " field and describe.Obviously, because the transannular frame of expansion promptly has indication at first bit, ordinary node only needs simple the forwarding, has only cross connection node just to handle " transannular control " field.Therefore, interannular transmission is grouped in the compatibility that has kept on the frame format with the RPR standard frame.
Fig. 2 (a) and (b) shown in provide the definition of " ring control " field that standard RPR " ring control " field and this paper proposes respectively.Both differences are in " TTL " field, standard be 8 bits, the present invention has then used wherein 7 bits, the highest 1 bit expanded is defined as transannular indication XI, and when XI=1, this field is a life span in the subring of transannular frame, and its numerical value is the cross connection node sum in the subring.Every through a cross connection node, life span subtracts one in the subring of transannular frame.When transannular frame " TTL " field of receiving is zero, is promptly abandoned, thereby avoided erroneous frame in subring, to form " endless loop ".
The present invention adopts the identification number of a 8bit field description ring, and such definition can realize 255 RPR ring interconnection (" 0 " identification number keeps, and does not have the tangent rings indication as an end of cross connection node).The route of transannular transmission data adopts the ring identification number that strides across each ring in source node MAC Address, the way, the place ring identification number and the destination node MAC Address of destination node to describe, and " transannular control " field that is described in of relevant this route provides.As follows based on " transannular control " Field Definition in the RPR transannular transmission grouping of ring sign addressing: first byte is indicated as " transannular progression ", is used for describing this frame is sent to the ring that the target ring need stride across from current ring progression.Thereafter " ring sign route " field of m byte is used for describing this frame and arranges the ring identification number (as shown in Figure 3) that needs all rings of process to the ring transmission of destination node place according to inverted order successively from source node place ring.Like this, the transannular frame is about to transannular progression and subtracts 1 after entering a new ring, and when transannular progression is kept to 0, still its destination node of no show thinks that promptly this frame is an invalid frame, makes discard processing.
When the transannular frame enters a new subring, the cross connection node of inlet should take off its header field, again produce header field, wherein the field of Geng Xining is " ring control ", " transannular progression ", " ring sign route " and " stem CRC " field.As can be seen, " transannular control " field is added in before the stem CRC, upgrades header field and only need recomputate stem CRC, and do not need to handle Payload thereafter, thereby alleviated the processing load of each node greatly, help improving the transmission performance of looped network more.
For example, in many ring RPR networks that the tangent interconnection of described 6 subrings of Fig. 1 constitutes, certain grouping need be sent to node 5 in the subring 4 from the node the subring 56, and the frame format stem of its grouping as shown in Figure 4.Wherein, XI=1, TTL=2, by hexadecimal form, target MAC (Media Access Control) address is 00-10-A4-97-A8-DE, source MAC is 00-10-A4-96-A8-AF; Its ring sign route is (subring 5) → (subring 1) → (subring 2) → (subring 4), that is whole group need stride across 3 rings, so " transannular progression=3, the variation of " transannular control " field in this packet transmission as shown in Figure 5.When this was grouped in the subring 5, " transannular progression " was 3, was offset 3 backward by " transannular progression " field, and the ring identification number that obtains the next target ring of this grouping is ' 1 '.And this route that is grouped in the subring 5 is (node 6) → (node 5) → (node 4).When grouping arrives node 5, owing to be cross connection node, it will handle packet header.At first TTL is subtracted one, find the ring identification number of next target ring then, the tangent rings identification number that is connected with oneself compares, and the result is inequality, so forward node 4 to.Node 4 same elder generations subtract one with TTL, find the ring identification number of next target ring then, and the tangent rings identification number that is connected with oneself relatively comes to the same thing, so forward grouping in the subring 1 continuation transmission.If the ring identification number of the next target ring of grouping is made mistakes, the comparative result of node 4 is also inequality, and this grouping just continues transmission in subring 5, through node 3,2,1,6, these nodes all are standard nodes, do not handle the transannular grouping, so node 5 is got back in grouping.Node 5 finds that ttl value has been " 0 ", so abandon this grouping, has avoided its Infinite Cyclic in subring to go down.If what be grouped in Route Selection in the subring 5 is (node 6) → (node 1) → (node 2) → (node 3) → (node 4), because node 6,1,2,3 all is a standard nodes, do not handle the transannular grouping, so the very fast arrival node 4 of grouping.Therefore can determine all that by any one node in the subring 5 this grouping should go out ring from node 4.
Before being grouped in node 4 and going out ring, also " the transannular progression " of packet header to be subtracted one, and deletion ring identification number 1, hand to the node 1 of subring 1 then.The node 1 of subring 1 is two MAC that are connected back-to-back that are in same cross connection node with the node 4 of subring 5.After this grouping forwards subring 1 node 1 to, it only needs the cross connection node sum 2 of subring 1 is write " TTL " field, and determine to be grouped in the forwarding route (interior ring or outer shroud) in the subring 1, the path on both sides equates in this example, thereby can determine routing direction according to the situation of utilizing of bandwidth.So grouping can be forwarded in the node 4 of subring 1 and handle, at this moment " transannular progression " is 2, and the skew 2 next target ring identification numbers that obtain this grouping are 2.So go down, this grouping can arrive destination node place subring 4.At the node 3 of subring 4, put XI=0, empty " transannular control " field, simultaneously according to target MAC (Media Access Control) address, determine RI=0, TTL=1 is grouped on the frame format identically with standard RPR, finally is sent to destination node smoothly.
Claims (1)
1. Resilient Packet Ring multiple ring interconnection transmission method based on ring sign route is characterized in that this method is as follows:
1.) between the subrings in the many rings of the regulation RPR networks by tangent interconnection, different ring identification number of each RPR subring distribution; Consider the reasonability of network size, get ring and be designated a byte, the subring number that allows tangent interconnection is 255, defining the node that is positioned in the multiple ring interconnection network on the points of tangency simultaneously is cross connection node, be responsible for the processing of the transannular frame of expansion, realize transannular addressing and transmission, other node is a standard nodes, be responsible for the processing of RPR standard frame, finish transmission and the control of subring internal standard RPR;
2.) grouping of transmitting in many ring RPR networks has two classes: the grouping of the grouping of transmission and transannular transmission in the subring; Format frame with regulation during transmitted in packets occurs; Being grouped in of transannular transmission carried out the compatible extensions definition on the RPR standard frame basis, get its first bit as transannular transmission indication XI, when XI=' 0 ', this frame is a standard frame, is used to transmit the grouping of transmission in the subring; When XI=' 1 ', this frame is the transannular frame of expansion, is used to transmit the grouping of transannular transmission;
3.) transannular frame to expanding, before stem CRC, insert adjustable length some bytes, as " transannular control " field of expanded definition, and the cross connection node sum in the current place subring of will dividing into groups writes " TTL " field, prevents that erroneous frame from forming endless loop in subring; Have only cross connection node just to handle the transannular frame of expansion, " transannular control " field is inserted the transannular frame stem of RPR expansion, partly place stem, with the irrelevant characteristics of load to keep the RPR addressing; In transmission course, each node only need be handled stem like this, recomputates the CRC of stem, to shorten the processing time;
4.) " transannular control " first byte of field is deposited " transannular progression ", indicates grouping and arrives the subring number that destination node place subring need stride across by the subring of current place, represents its network lifetime; Second byte of " transannular control " field begins the ring sign route for the length dynamic change, and inverted order discharging grouping arrives the ring identification number that needs each subring of process in the destination node process; The purpose of inverted order is for the ease of peeling off the identification number of the subring of having passed through step by step, and when grouping arrives the subring of destination node place, the transannular control section of the transannular frame of expansion will all be stripped from, and packet recovery is the RPR standard frame format;
The transannular transmission concrete steps that realize a grouping are as follows:
The first step: node is received a grouping, judges that at first whether this grouping is the grouping of transannular transmission, promptly judges according to the frame format of grouping whether first bit of this grouping is " 1 "; Be " 1 ", and node is cross connection node, then changed for second step over to, node is a standard nodes, does not then deal with, directly forwarding; Be not " 1 ", and node is cross connection node, then do not deal with that directly transmit, node is a standard nodes, then handles according to standard RPR method, finishes transmission course;
Second step: whether the stem CRC that judges grouping is correct, if incorrectly then abandon this grouping; If correct, judge further whether " TTL " value is " 0 ", if " 0 " also abandons this grouping; Not being " 0 ", judging further whether " the transannular progression " of grouping is " 0 ", if " 0 " also abandons this grouping, is not " 0 ", changes for the 3rd step over to;
The 3rd step: the ring identification number of judging current addressing route, the identification number that is the next subring that whether connects with this node of the byte in stem CRC front is identical, if it is inequality, " TTL " value is subtracted one, recomputate the stem CRC of grouping, in the subring of the former transmission of grouping, transmit grouping by former transmission direction; If identical, then changed for the 4th step over to;
The 4th step: peel off the ring identification number of current addressing route, promptly delete this byte, simultaneously " transannular progression " is subtracted one, and whether judged result is " 0 "; If be not " 0 ", the cross connection node sum in the next subring is write " TTL " field, changed for the 5th step over to; If " 0 " then deletes " transannular control " field, and checks in " TTL " value by the standard topology slip condition database in next subring, insert first byte of grouping, the first bit reset of will dividing into groups simultaneously makes it be transformed into the RPR standard frame format, changes for the 5th step then over to;
The 5th step: recomputate the stem CRC of grouping, the next subring that by this node be connected tangent with former transmission subring sent in grouping, continue to transmit; If grouping has become the RPR standard frame, then, can finish transmission easily according to the target MAC (Media Access Control) address of its stem.
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| CN102215123B (en) * | 2011-06-07 | 2013-10-30 | 南京邮电大学 | Multi-ring-network-topology-structure-based large-scale trunking system |
| CN106452874B (en) * | 2016-10-18 | 2019-09-24 | 北京东土科技股份有限公司 | Ring ID generation method and network system |
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