WO2004056049A1 - Reseau ethernet en double anneau - Google Patents
Reseau ethernet en double anneau Download PDFInfo
- Publication number
- WO2004056049A1 WO2004056049A1 PCT/FR2003/050162 FR0350162W WO2004056049A1 WO 2004056049 A1 WO2004056049 A1 WO 2004056049A1 FR 0350162 W FR0350162 W FR 0350162W WO 2004056049 A1 WO2004056049 A1 WO 2004056049A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- frames
- primary
- frame
- network
- repeaters
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
- H04L41/06—Management of faults, events, alarms or notifications
- H04L41/0654—Management of faults, events, alarms or notifications using network fault recovery
- H04L41/0663—Performing the actions predefined by failover planning, e.g. switching to standby network elements
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/42—Loop networks
- H04L12/437—Ring fault isolation or reconfiguration
-
- 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
- H04L45/28—Routing or path finding of packets in data switching networks using route fault recovery
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L47/00—Traffic control in data switching networks
- H04L47/10—Flow control; Congestion control
- H04L47/30—Flow control; Congestion control in combination with information about buffer occupancy at either end or at transit nodes
Definitions
- the present invention relates to an Ethernet network for the transmission of data frames.
- an Ethernet network is a local network comprising a plurality of Ethernet switches connected by the same communication line such as an optical fiber; each of the switches receives useful data frames from equipment such as personal computers and transmits these data frames to the other switches which will transmit said data to other equipment.
- Each of the Ethernet switches has a plurality of ports connected to the equipment and to the other switches.
- Each of the switches inspects the source and destination addresses of the frames, draws up a table which allows it to know which equipment is connected to which port of the switch; this process is done by self-learning, that is to say automatically as the frames are exchanged. Thus, knowing the recipient's port, the switch will only transmit the message on the appropriate port, the other ports therefore remaining free for other transmissions that can occur simultaneously.
- One of the problems of this type of network relates to the operation of said network when a fault such as a break in the optical fiber or a fault on an optical port occurs.
- the optical network 100 comprises three Ethernet switches 111, 112 and 113.
- the switches 111, 112 and 113 are connected to each other by a ring primary 123 and by a secondary ring 124.
- the two rings 123 and 124 are for example optical fiber rings.
- the rings 123 and 124 are counter-rotating rings, that is to say that the frames have opposite directions of transmission from one another as indicated by the arrows. In normal operation, the frames are transmitted on the two rings except on sections 123A and 124A.
- the present invention aims to provide an Ethernet network for the transmission of frames comprising a plurality of repeaters and making it possible to ensure both an efficient transition to fault operation and not to reset the routing tables of the Ethernet switches. in the event of a switch to fault operation.
- the present invention proposes for this purpose an Ethernet network comprising a plurality of Ethernet switches and a plurality of repeaters exchanging frames of useful data coming from external equipment, each of said repeaters being associated with one of said Ethernet switches and comprising: - a primary transmitter and a secondary transmitter,
- said network being characterized in that it comprises two states:
- said network comprising means for short-circuiting part of said primary ring by a part of said secondary ring in the event of a fault on said primary ring, the useful data frames being transmitted to said Ethernet switches only when they circulate on said primary ring.
- each of said repeaters includes switching means so that said useful data frames can circulate in three states:
- said primary and secondary rings are optical rings.
- operation control frames called stuffing frames, circulate permanently on said secondary ring when said network is in said normal operating state, each of said stuffing frames being transmitted by a repeater then deleted on reception by the next repeater, said adjacent receiver.
- said useful data and padding frames transmitted on said network each comprise a so-called fault bit, each of said repeaters comprising means for passing said fault bit into an active state in order to signal to the adjacent repeater, a malfunction. and to impose the passage of said network in operating state on fault.
- each of said repeaters comprises a buffer memory, said useful and stuffing data frames comprising a so-called saturation bit, each of said repeaters comprising means for passing said saturation bit into an active state in order to signal a buffer overflow at the adjacent repeater.
- stuffing frames also circulate on said primary ring in the absence of useful data frames.
- each of said repeaters includes means for interrupting the circulation of a frame of useful data that said repeater has itself transmitted.
- the frames sent by a repeater go around the ring.
- the circuit is opened by the transmitting repeater to interrupt the circulation of the frame when the repeater receives a frame which it has transmitted.
- each of said useful data frames comprises an address byte, said address corresponding to the address of the repeater having transmitted said useful data frame, the circulation of said useful data frame being interrupted when a repeater recognizes its own address in said useful data frame.
- each of said stuffing frames comprises an address byte, said address being identical for each of the stuffing frames.
- each of the useful data frames comprises a counter byte, said counter being incremented each time said frame passes through a repeater while circulating on said primary ring.
- each of said repeaters includes means for deleting a useful data frame when its counter byte exceeds the total number of repeaters on said network.
- each of said repeaters comprises said Ethernet switch which is associated with it.
- each of said Ethernet switches is outside the repeater associated with it.
- the structure of each of said data frames is modified relative to the structure of an Ethemet frame standard so that the start of each of said frames includes said fault bit and or said saturation bit and / or said address byte and / or said counter byte.
- said start of each of said frames includes a CRC cyclic redundancy check byte.
- said start is the preamble of said standard Ethernet frame.
- FIG. 1 schematically represents an Ethemet network according to the prior art
- FIG. 2 schematically represents a network according to the invention in normal operation
- FIG. 3 schematically represents a network according to the invention in operation on fault
- Figures 4 to 6 schematically represent three states of a repeater used in a network according to the invention.
- Figure 1 has already been described in relation to the state of the art.
- FIG. 2 schematically represents an Ethernet network 10 according to the invention in normal operation.
- This network uses optical technology of the 100BaseFX type.
- a 4B / 5B and NRZ1 type coding of Ethernet at 100Mbs ensures permanent activity on the optical links.
- the network 10 includes:
- Each of the repeaters i (1 ⁇ i ⁇ 5) includes: - a primary Rpi receiver,
- Each of the repeaters i is associated with an Ethernet switch Ci.
- the primary ring F1 transmits frames entering by the receivers Rpi and leaving by the transmitters Epi.
- the secondary ring F2 transmits frames entering by the receivers Rsi and leaving by the transmitters Esi. All the frames which circulate on the primary ring F1 and arrive on a repeater i, are transmitted to the Ethemet switch Ci and are transmitted at the same time to the next repeater.
- the two rings F1 and F2 run in opposite directions with respect to each other.
- the useful data frames that is to say the frames sent by the equipment (ej) ⁇ ⁇ j ⁇ n
- the useful data frames circulate only on the primary ring F1 but we will see with reference to FIG. 3 that the frames useful data can also circulate on the secondary ring F2.
- operating control frames called stuffing frames
- Jam frames are never retransmitted by a repeater i. They are checked and then deleted upon receipt.
- All the frames circulating on the two optical rings F1 and F2 are modified compared to the standard Ethemet frames in 100Base FX technology.
- four specific bytes are used in the preamble and take the place of four bytes in the preamble of the standard Ethernet frame. These four bytes are added by the repeater i upon reception of a useful data frame sent by an equipment ej and deleted when a useful data frame is output to a device.
- the stuffing frames also have these four specific bytes.
- All the useful data frames include an address byte coded from 1 to 127: the value of this byte depends on the address of the repeater; this byte is not modified by crossing repeaters 1 to 5.
- the stuffing frames are coded with an address equal to 0.
- a data frame when transmitted by a repeater i, it goes around the ring F1.
- the repeater i then receives the frame which it itself sent and opens the circuit to interrupt the circulation of the frame.
- All the frames circulating on the rings F1 and F2 comprise a counter byte. This counter byte is incremented by each of the repeaters 1 to 5 when a frame circulates on the primary ring F1.
- the counter is at zero. The counter is then incremented by each repeater when the frame passes through the primary Epi / Rpi link. No processing is carried out when the frames pass through a repeater through the secondary ring F2.
- a repeater i When a repeater i is out of operation, it can no longer delete the frames which it has itself sent.
- the counter byte makes it possible to avoid having a frame circulating permanently on the network.
- the frame is eliminated by another repeater when the counter byte exceeds the total number of repeaters initially present on the network.
- This status byte includes at least:
- a repeater i uses the saturation bit when it detects a saturation of its buffer memory, not shown. For that, it fixes the bit saturation of a stuffing frame to 1 and sends this stuffing frame on the secondary ring to the adjacent repeater. For example, if the repeater 2 is saturated, it sends a stuffing frame with a saturation bit set to 1 to the repeater 1 on the secondary ring F2. The use of the fault bit will be more precisely described with reference to FIG. 3.
- All the frames circulating on the rings F1 and F2 comprise a cyclic redundancy check byte CRC; this CRC byte is different from the CRC byte of the standard Ethemet frame.
- FIG. 3 schematically represents the network 10 as shown in FIG. 2 for which the link of the primary ring F1 between the transmitter Ep2 and the receiver Rp3 is broken.
- the repeater 3 no longer receives frames on the receiver Rp3 and thus detects a break in the optical fiber of the primary ring F1.
- the repeater 3 then uses a stuffing frame represented by the dotted arrow in which the fault bit is set to 1; this stuffing frame is sent to the adjacent repeater 2.
- the useful data traffic is then diverted to the secondary ring F2.
- the useful data frames pass through the secondary transmitter Es2 then circulate on the secondary ring F2 to the secondary receiver Rs3.
- the network is thus self-healing.
- Useful data frames are only transmitted to switches
- Another reason that can lead to self-healing is the specific CRC byte.
- the CRC indicates a transmission fault, for example between a transmitter and a receiver, the network is also self-healing.
- a repeater i as shown in FIGS. 2 and 3 can take at least three possible states depending on the operating state of the network 10.
- FIG. 4 schematically represents a first state, called state A, of a repeater i.
- the repeater i includes:
- first means 17 for modifying specific bytes and transmitting stuffing frames
- second means 18 for modifying specific bytes and transmitting stuffing frames
- the three ports P1, P2 and P3 are ports of the Mil (Media Independent Interface) type.
- Port P1 is the port to the Ethemet switch Ci not shown.
- the ports P2 and P3 are the sending and receiving ports of the frames on the primary and secondary rings.
- the means 12 make it possible to insert the specific bytes into the preamble of the standard Ethernet frames of useful data received from the equipment via the port P1 of the Ethernet switch.
- the means 11 make it possible to delete the specific bytes from the useful data frames before they are sent to the port P1 of the Ethernet switch and then to the devices.
- Each of the switching means 13, 14 and 15 can switch between two configurations.
- the switching means 13, 14 and 15 are such that a frame TA1 arriving on the primary receiver Rpi is:
- This TA1 frame is also transmitted to port P1 to the Ethernet switch when it is a useful data frame; the means 11 delete the specific bytes of the frame TA1 which again becomes a standard Ethernet frame.
- the switching means 13, 14 and 15 are such that a frame TA2 arriving on the secondary receiver Rsi is:
- this TA2 frame is not transmitted to port P1 to the Ethernet switch; in this way, in the event of self-healing, the useful data frames of the TA2 type are very transparent with respect to the Ethernet switches when they circulate on the secondary ring.
- a new useful data frame TA3 received via the port P1 is first modified by the means 12 which insert the specific bytes in the preamble of said frame; it is then transmitted to the primary Epi transmitter which sends it to the primary ring.
- the frames TA1 are useful data frames and the frames TA2 are stuffing frames. This is the configuration of repeaters 1 to 5 shown in FIG. 2. In this case, it is also possible that the frames TA1 are stuffing frames in the absence of useful data frames.
- the means 17 and 18 make it possible to pass the fault bit of a frame sent to an adjacent repeater in an active state.
- the means 17 and 18 also make it possible to pass the saturation bit of a transmitted frame to an adjacent repeater in an active state.
- the frames TA1 and TA2 are useful data frames. This is the configuration of repeaters 1, 4 and 5 shown in Figure 3. In this case, It is also possible that the frames
- TA1 and TA2 are stuffing frames in the absence of useful data frames.
- FIG. 5 schematically represents a second state, called state
- the switching means 13, 14 and 15 are such as a frame
- This frame TB1 is also transmitted to port P1 to the Ethemet switch when it is a useful data frame; the means 11 delete the specific bytes of the frame TB1 which again becomes a standard Ethernet frame.
- a new useful data frame TB2 received via the port P1 is first modified by the means 12 which insert the specific bytes in the preamble of said frame; it is then transmitted to the secondary transmitter Esi which sends it to the secondary ring.
- FIG. 6 schematically represents a third state, called state
- the switching means 13, 14 and 15 are such that a frame TC1 arriving on the secondary receiver Rsi is: - either re-sent by the secondary transmitter Epi, - or deleted by the processing means 19 when it is a question of '' a frame sent by the transmitter itself or a stuffing frame or when the counter byte is exceeded.
- This TC1 frame is also transmitted to port P1 to the Ethernet switch when it is a payload frame; the means 11 delete the specific bytes of the frame TB1 which again becomes a standard Ethernet frame.
- a new frame of useful data TC2 received via the port P1 is first modified by the means 12 which insert the specific bytes in the preamble of said frame; it is then transmitted to the primary Epi transmitter which sends it to the primary ring.
- This configuration is that of the repeater 3 shown in FIG. 3.
- the invention is not limited to the embodiment which has just been described.
- the invention has been described in relation to an optical network but it can be transposed to an electrical network.
- a third type of frame such as an identification frame.
- This frame makes it possible to manage the phases of initialization of the network and appearance / disappearance of repeater on the ring.
- This frame emitted by a repeater goes around the ring. It is propagated by the repeaters on the ring as a payload frame but it is not sent to the P1 port.
- the counter byte is incremented with each passage of the frame in a repeater by the primary ring. On its return, the repeater knows the number of repeaters present on the ring. This value is stored in the repeater.
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Small-Scale Networks (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2003299420A AU2003299420A1 (en) | 2002-12-13 | 2003-12-11 | Dual-ring ethernet network |
EP03799718A EP1570605A1 (fr) | 2002-12-13 | 2003-12-11 | Reseau ethernet en double anneau |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0215864A FR2848756B1 (fr) | 2002-12-13 | 2002-12-13 | Reseau ethernet |
FR02/15864 | 2002-12-13 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2004056049A1 true WO2004056049A1 (fr) | 2004-07-01 |
Family
ID=32338794
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR2003/050162 WO2004056049A1 (fr) | 2002-12-13 | 2003-12-11 | Reseau ethernet en double anneau |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP1570605A1 (fr) |
CN (1) | CN1723659A (fr) |
AU (1) | AU2003299420A1 (fr) |
FR (1) | FR2848756B1 (fr) |
WO (1) | WO2004056049A1 (fr) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1811782A2 (fr) | 2006-01-24 | 2007-07-25 | Penton Media Technologies Co., Ltd. | Système de surveillance connecté en réseau en anneau avec contrôle de sauvegarde en temps réel |
EP1883830A2 (fr) * | 2005-05-18 | 2008-02-06 | Formation, Inc. | Circuit de derivation ethernet a semi-conducteur |
WO2008031336A1 (fr) * | 2006-09-07 | 2008-03-20 | Huawei Technologies Co., Ltd. | Procédé, dispositif et système permettant d'éviter la formation de cycle de données sur boucle dans un réseau ethernet en anneau |
EP2148473A1 (fr) | 2008-07-22 | 2010-01-27 | ABB Research Ltd | Noeuds de commutation pour réseaux à forte disponibilité |
CN101291258B (zh) * | 2007-04-19 | 2010-12-29 | 中兴通讯股份有限公司 | 用于通讯平台多框互连时的以太网环路处理方法 |
EP2309678A1 (fr) * | 2009-10-08 | 2011-04-13 | Nxp B.V. | Composant de réseau Ethernet |
US8169895B2 (en) | 2006-04-12 | 2012-05-01 | Hitachi, Ltd. | Network system and node |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2893205A1 (fr) * | 2005-11-09 | 2007-05-11 | Hardtech Sarl | Methode de gestion d'un reseau a anneaux redondes |
JP5061748B2 (ja) * | 2007-06-21 | 2012-10-31 | 日本電気株式会社 | パケットリングネットワークシステム、パケット転送方法 |
CN100534024C (zh) * | 2007-11-26 | 2009-08-26 | 中控科技集团有限公司 | 基于工业以太网的故障处理方法、系统及一种交换设备 |
CN101989930B (zh) * | 2010-12-14 | 2012-12-12 | 迈普通信技术股份有限公司 | 实现以太网双环的方法及其交换设备 |
DE102013212020A1 (de) * | 2013-06-25 | 2015-01-08 | Robert Bosch Gmbh | Verfahren zum Betreiben einer Kommunikationsanordnung |
-
2002
- 2002-12-13 FR FR0215864A patent/FR2848756B1/fr not_active Expired - Fee Related
-
2003
- 2003-12-11 CN CN200380105578.3A patent/CN1723659A/zh active Pending
- 2003-12-11 EP EP03799718A patent/EP1570605A1/fr not_active Ceased
- 2003-12-11 AU AU2003299420A patent/AU2003299420A1/en not_active Abandoned
- 2003-12-11 WO PCT/FR2003/050162 patent/WO2004056049A1/fr not_active Application Discontinuation
Non-Patent Citations (2)
Title |
---|
"An introduction to Resilient Packet Ring Topology", WHITE PAPER BY THE RESILIENT PACKET RING ALLIANCE, October 2001 (2001-10-01), XP002198916, Retrieved from the Internet <URL:www.rpralliance.org> [retrieved on 20020515] * |
CASALE S ET AL: "A fault management module for IEEE LANs", IEEE, 14 August 1989 (1989-08-14), pages 945 - 949, XP010090360 * |
Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1883830A2 (fr) * | 2005-05-18 | 2008-02-06 | Formation, Inc. | Circuit de derivation ethernet a semi-conducteur |
EP1883830A4 (fr) * | 2005-05-18 | 2011-09-07 | Formation Inc | Circuit de derivation ethernet a semi-conducteur |
EP1811782A2 (fr) | 2006-01-24 | 2007-07-25 | Penton Media Technologies Co., Ltd. | Système de surveillance connecté en réseau en anneau avec contrôle de sauvegarde en temps réel |
EP1811782A3 (fr) * | 2006-01-24 | 2008-12-03 | Penton Media Technologies Co., Ltd. | Système de surveillance connecté en réseau en anneau avec contrôle de sauvegarde en temps réel |
US8169895B2 (en) | 2006-04-12 | 2012-05-01 | Hitachi, Ltd. | Network system and node |
WO2008031336A1 (fr) * | 2006-09-07 | 2008-03-20 | Huawei Technologies Co., Ltd. | Procédé, dispositif et système permettant d'éviter la formation de cycle de données sur boucle dans un réseau ethernet en anneau |
CN101291258B (zh) * | 2007-04-19 | 2010-12-29 | 中兴通讯股份有限公司 | 用于通讯平台多框互连时的以太网环路处理方法 |
EP2148473A1 (fr) | 2008-07-22 | 2010-01-27 | ABB Research Ltd | Noeuds de commutation pour réseaux à forte disponibilité |
US8582424B2 (en) | 2008-07-22 | 2013-11-12 | Abb Research Ltd | Ring coupling nodes for high availability networks |
EP2309678A1 (fr) * | 2009-10-08 | 2011-04-13 | Nxp B.V. | Composant de réseau Ethernet |
CN102035702A (zh) * | 2009-10-08 | 2011-04-27 | Nxp股份有限公司 | 以太网网络组件 |
CN102035702B (zh) * | 2009-10-08 | 2013-10-30 | Nxp股份有限公司 | 以太网网络组件 |
Also Published As
Publication number | Publication date |
---|---|
CN1723659A (zh) | 2006-01-18 |
EP1570605A1 (fr) | 2005-09-07 |
FR2848756B1 (fr) | 2005-02-04 |
FR2848756A1 (fr) | 2004-06-18 |
AU2003299420A1 (en) | 2004-07-09 |
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