JP2024028686A - Method of downloading packet from server using mac ring network - Google Patents

Abstract

To implement a network in which a terminal downloads a packet from a server at a high speed and a low cost.SOLUTION: A terminal or a mobile terminal, before receiving a service from a server, stores a lower address of a MAC address of the terminal or the mobile terminal on a lower address memory to be used in storing packet pass-through MAC address of a device for add, drop, and pass-through of a packet in a ring network, then transmits a download request packet for a packet having the MAC address of the terminal or the mobile terminal, after a predetermined time passes, to the server, deletes the lower address of the MAC address of the transmission source of the packet from the lower address memory that is used in storing packet pass-through MAC address of the device and stores the lower address on a lower address memory designating transmission of the packet to the outside of the ring, and transmits the packet to the server on a counterclockwise ring.SELECTED DRAWING: Figure 1

Description

The present invention relates to a method for downloading packets from a server over a MAC ring network. In the present invention, a transfer packet in which the MAC address portion of the IPv6 address of an Ethernet (registered trademark) frame or IPv6 packet is used as an Ethernet address is referred to as a MAC packet.

A conventional example of an address storage method is JP-A No. 2000-151617 "Table Creation and Search Device" in Patent Document 1. This conventional example relates to a MAC address storage circuit, and includes a first table composed of a RAM having a matrix address, a MAC address data area, and an index area, and a RAM having a matrix address, a MAC address data area, and an index area. The second table consists of the following table. In this conventional example, the entire 48 bits of the MAC address are stored at location A, which specifies the memory of the first table using the lower bit string (for example, 16 bits). If another MAC address is already stored in that location A, it is recorded in a free address location B in the memory of the second table, and the recorded address location B is stored in the address location A of the first table. Store in the index area. This is a method of specifying recording areas by nesting.

Further, as a conventional technique of an address storage method, there is Patent Document 2, JP-A No. 2004-15592 entitled "MAC address pointer structure and MAC address sorting method". This conventional example is a method of storing a plurality of MAC addresses at the same address position in an entry table specified by a lower bit string. If there is no free area, the MAC address is stored in an entry table specified by a lower bit string different from the lower bit string of the MAC address.

As a conventional example of a ring type network, a ring network using a master switch and a slave switch as in Patent Document 3 is common. In this ring network, one ring port of the master switch is a blocked port that does not allow frames to pass, to prevent congestion due to flooding. When a failure occurs in the ring network, the monitoring frames that go out from the master switch and return to the master switch no longer reach the master switch, and instead failure notification frames arrive at the master switch from the slave switch at the point of failure. unblocks the blocked port and allows the frame to pass. In addition, a block port is set on the failed transmission line side of one of the slave switches at the failure point, and the operation of the ring network is maintained even after the ring network failure is recovered.

Japanese Patent Application Publication No. 2000-151617 Japanese Patent Application Publication No. 2004-15592 Re-table No. 2008-068813

A conventional example of a conventional address storage method, JP-A No. 2000-151617, stores MAC addresses by nesting, so there is a problem in that it takes time to trace the destination of a stored address. Furthermore, since the entire 48 bits of the essential MAC address are stored, there is a problem that the storage area becomes large.

Furthermore, a conventional example of a conventional address storage method, JP-A No. 2004-15592, states that if there is no free space in the entry table position of the MAC address specified by the lower bit string, the MAC address is stored in the entry table position of a different lower bit string. However, in that case, when selecting the location to store the MAC address, the entry table location specified by the two lower bit strings must be searched, and the same address location in the same entry table must be searched. Since there are multiple storage addresses, it is necessary to compare these multiple addresses, and there is a problem in that the search takes time.
Searching for a MAC address using the lower bit string becomes faster, but basically the method of storing the entire MAC address in the lower bit string position is accurate storage, but since the entire 48 bits must be stored, the number of stored addresses decreases. There are fewer problems.
Patent Document 3, which is a conventional ring network, uses a MAC address table using 48 bits of MAC addresses, so it has the disadvantage that it can only store a small number of MAC addresses.

Conventional ring networks that transfer MAC packets use a MAC address table, so they suffer from speed limitations and congestion due to short packets such as ACK packets. Alternatively, the MAC address table is accessed by add packets to the ring, packets from the counterclockwise ring, and packets from the clockwise ring, which has the drawback of causing speed reduction.

An object of the present invention is to present a simple method for downloading packets from a server to a terminal using a ring network without using a conventional MAC address table.

The present invention has been made in view of the problems of the prior art described above, and a first aspect of the present invention as a means for solving the problem is to add, drop, and pass a plurality of packets to a ring network or a tree-shaped ring network. A concentrator or a base station is connected to the packet add, drop, and pass device, and a terminal under the concentrator or a mobile terminal under the base station is connected to the right side of the ring network. Connected via a router to an apex device that blocks the passage of packets (MAC packets) that use the MAC address part of the IPv6 address or the MAC address part of the IPv6 address as the MAC address of the MAC packet to pass through. To communicate with the server, information is transferred as UDP or TCP MAC packets within one domain to the router, and between the router and the server, IP packets are transferred to the terminal or mobile terminal of the network, and A packet transfer system for UDP packet transfer,
Before the terminal or the mobile terminal receives service from the server, the lower address of the MAC address of the terminal or the mobile terminal is stored as the packet passing MAC address of the packet adding, dropping and passing device of the ring network. After a certain period of time has elapsed, a download request packet having the MAC address of the terminal or a download request packet having the MAC address of the mobile terminal is sent to the server, and the source MAC of the packet is stored in the lower address memory to be used. The lower address of the address is erased from the lower address memory used when storing the packet passing MAC address of the device for adding, dropping, and passing packets of the ring network, and the lower address of the source MAC address of the packet is changed to the lower address of the packet of the ring network. A lower address specifying the sending of the packet out of the ring of the add, drop and pass device of the packet is stored in the memory to direct the packet through the counterclockwise ring to the server, and the packet is sent to the add, drop and pass device of the packet. , and if the lower address of the source MAC address of the packet is stored in the lower address memory used when storing the packet passing MAC address or in the lower address memory that specifies packet transmission outside the ring, means for storing a source MAC address of a packet in an address table specifying passage of the packet and directing the packet to a server;
When a packet other than the communication start packet from the server arrives at a device for adding, dropping, and passing packets via a clockwise ring, and the destination MAC address of the packet is stored in the address table that specifies packet passing. When the packet is sent to the front of the clockwise ring, the destination MAC address of the packet is not stored in the address table that specifies the passage of the packet, and the lower address of the destination MAC address of the packet is If the packet passing MAC address is stored in the lower address memory used when storing the packet passing MAC address, the destination MAC address of the packet is stored in an address table specifying the passing of the packet, and the packet is sent to the front of the clockwise ring; Other than the above, if the lower address of the destination MAC address of the packet is stored in the lower address memory that specifies sending the packet outside the ring, the packet is sent outside the ring, and the destination MAC address of the packet is If the lower address of the packet is not stored in a lower address memory that specifies packet transmission outside the ring, the packet is transmitted clockwise to the front of the ring. .

A second aspect of the present invention is a lower address memory for specifying packet sending out of a ring of a packet adding, dropping and passing device applied to the packet transfer system according to the first aspect of the present invention. , a second lower address memory for specifying packet transmission to the outside of the ring, which is used separately for the case where the counterclockwise ring is read by a packet transferred and the case where the clockwise ring is read by a packet transferred. a lower address for specifying packet transmission outside the ring of a packet adding, dropping, and passing device, characterized in that a lower address of a source MAC address of a packet to be added to the ring is stored in the two memories; It's memory.

A third aspect of the present invention is to insert a plurality of packet adding, dropping, and passing devices into a ring network or a tree-like ring network, and connecting a line concentrator or base station to the packet adding, dropping, and passing devices. Then, the terminal under the concentrator or the mobile terminal under the base station converts the MAC address portion of the Ethernet frame or IPv6 address other than the OAM packet arriving from the clockwise ring of the ring network into the MAC packet's MAC address. In order to communicate with a server connected via a router to a vertex device that blocks the passage of forwarded packets (MAC packets) using them as addresses, information is forwarded within one domain to the router as UDP or TCP MAC packets. , a packet transfer method of TCP packet transfer and UDP packet transfer to the terminal or the mobile terminal of a network in which IP packets are transferred between the router and the server,
Before the terminal or the mobile terminal receives service from the server, the lower address of the MAC address of the terminal or the mobile terminal is stored as the packet passing MAC address of the packet adding, dropping and passing device of the ring network. After a certain period of time has elapsed, a download request packet having the MAC address of the terminal or a download request packet having the MAC address of the mobile terminal is sent to the server, and the source MAC of the packet is stored in the lower address memory to be used. The lower address of the address is erased from the lower address memory used when storing the packet passing MAC address of the device for adding, dropping, and passing packets of the ring network, and the lower address of the source MAC address of the packet is changed to the lower address of the packet of the ring network. A lower address specifying the sending of the packet out of the ring of the add, drop and pass device of the packet is stored in the memory to direct the packet through the counterclockwise ring to the server, and the packet is sent to the add, drop and pass device of the packet. , and if the lower address of the source MAC address of the packet is stored in the lower address memory used when storing the packet passing MAC address or in the lower address memory that specifies packet transmission outside the ring, storing the source MAC address of the packet in an address table specifying passage of the packet and directing the packet to a server;
When a packet other than the communication start packet from the server arrives at a device for adding, dropping, and passing packets via a clockwise ring, and the destination MAC address of the packet is stored in the address table that specifies packet passing. When the packet is sent to the front of the clockwise ring, the destination MAC address of the packet is not stored in the address table that specifies the passage of the packet, and the lower address of the destination MAC address of the packet is If the packet passing MAC address is stored in the lower address memory used when storing the packet passing MAC address, the destination MAC address of the packet is stored in an address table specifying the passing of the packet, and the packet is sent to the front of the clockwise ring; Other than the above, if the lower address of the destination MAC address of the packet is stored in the lower address memory that specifies sending the packet outside the ring, the packet is sent outside the ring, and the destination MAC address of the packet is If the lower address of the packet is not stored in a lower address memory that specifies packet transmission outside the ring, the packet is transmitted clockwise to the front of the ring.

As described above, the present invention provides a lower address memory that stores only the lower address part of a MAC address in place of the conventional MAC address table, and a mis-allocation caused by mismatching of MAC addresses that occurs when using the lower address memory. In order to avoid storing packets with small number of MAC addresses, the device (node device) for adding, dropping and passing packets in the ring network uses an address table that specifies the passage of packets with a small number of MAC addresses. This method realizes downloading within one domain MAC address, which has the effect of reducing power consumption and system cost, and enabling high-speed communication.

Adding, dropping, and passing packets according to the first embodiment of the present invention, which has an address table that specifies packet passage, a lower address memory that specifies packet transmission outside the ring, and a lower address memory that stores addresses for packet passage. A terminal connected to the device for adding, dropping, and passing packets on the lowest ring of a tree-like ring network in which a double ring in which a plurality of devices are connected by optical rings is connected in a two-stage tree is connected to the device for adding, dropping, and passing packets on the lowest ring. In order to communicate with a server connected to a vertex device of a ring network via a router, the terminal receives a download packet service from the server, using Ethernet frames between the terminal and the router and IP packets between the router and the server. Diagram to explain operation example Adding, dropping, and passing packets according to the first embodiment of the present invention, which has an address table that specifies packet passage, a lower address memory that specifies packet transmission outside the ring, and a lower address memory that stores addresses for packet passage. FIG. 3 is a diagram illustrating a configuration example of a lower address memory that specifies packet transmission to the outside of the ring of the device;

A first embodiment of the present invention will be described with reference to FIG. This embodiment has multiple devices for adding, dropping, and passing packets, each having an address table for specifying packet passage, a lower address memory for specifying packet transmission outside the ring, and a lower address memory for storing addresses for packet passage. The information is transferred as MAC packets to the router through the concentrator connected to the packet add, drop, and pass device of the tree-like ring network, which is a two-tiered tree-like ring network in which a double ring network is connected with optical transmission lines. This is an example of an operation when a terminal receives a download packet service from a server using a ring network in a packet transfer system between a terminal and a server connected to the tree-shaped ring network via a router. The server is an Internet connection server or a content server.

In FIG. 1, 1-1 and 2-1 are the left-handed optical rings of the edge node, 1-2 and 2-2 are the right-handed optical rings of the edge node, 3-1 is the left-handed ring of the upper ring, and 3-2 is the clockwise ring of the upper ring, 4-1, 4-2 are devices connected to the upper ring, 5 is the apex device, 6-1, 6-2, 6-3, 6-4, 6-5, 6- 6, 6-8, 6-9, and 6-10 are devices for adding, dropping, and passing packets; 7-1 is a lower address memory that specifies packet transmission outside the ring; and 7-2 is an address memory for packet passing. 8 is an address table that specifies the passage of packets, 22 is a router, 12-1, 12-2, 12-3, 12-4, 12-5 is a line concentrator, 13-1, 13- 2 and 13-3 are UDP terminals or TCP terminals, 20 is a server, and 21 is a ring port that blocks passage of packets other than OAM packets arriving from the clockwise rings 1-2 and 2-2. Further, (1) to (27) are packets, and I0, I1, I2, I3, and I4 are domestic or regional IPv4 addresses of the service provider. Or an IPv6 address. Devices 6-8, 6-9, and 6-10 for adding, dropping, and passing packets in the upper ring 3 are located in edge nodes.
Note that the address table 8 that specifies the passage of packets is different from conventional MAC address tables in that it is an address table that does not store port numbers and stores only a small number of MAC addresses.

The operation of FIG. 1 will be explained below. First, it is assumed that the TCP terminals 13-1, 13-2, and 13-3 have already stored the IP address I1 of the router 22 and the MAC address r1r2 of the ring transmission path interface in their ARP tables. The TCP terminal 13-1 sends a packet (1) Mr1r2a1a2 (I0) (M indicates an Ethernet packet, r1 indicates the upper MAC address of the router 22 interface, r2 indicates the lower MAC address of the router 22 interface, a1a2 is the TCP The MAC address of the terminal 13-1 (indicating the upper MAC address a1 and lower MAC address a2, and I0 indicating the IP address of the destination server 20) was sent to the packet adding, dropping, and passing device 6-1. Give an example. When the packet reaches the add, drop, and pass device 6-1 from the TCP terminal 13-1, the lower address a2 of the source MAC address of the packet is set as the lower address that specifies the packet transmission outside the ring. Store in memory 7. The packet is transferred in the counterclockwise optical ring 1-1 by (2) Mr1r2a1a2 (I0) as shown in the figure, and arrives at the packet add, drop, and pass device 6-2.

When the packet (2) Mr1r2a1a2 (I0) arrives at the packet add, drop, and pass device 6-2, the lower address a2 of the source MAC address of the packet is a lower address that specifies packet transmission outside the ring. Since it is not stored in the memory 7, the packet is transferred as shown in the figure by (3) Mr1r2a1a2 (I0) on the counterclockwise optical ring 1-1, and sent to the packet add, drop, and pass device 6-3, and the upper layer. The packet arrives as (4) Mr1r2a1a2 (I0) at the packet add, drop, and pass device 6-8 of the upper ring 3 via the device 4-1 connected to the ring.
When the packet (4) Mr1r2a1a2 (I0) arrives at the packet add, drop, and pass device 6-8, the lower address a2 of the source MAC address of the packet is set as the lower address that specifies the packet transmission outside the ring. Store in memory 7. The packet is transferred on the counterclockwise optical ring 3-1 and arrives at the packet add, drop, and pass device 6-9. In the packet add, drop, and pass device 6-9, the lower address a2 of the source MAC address a4a2 is stored in the lower address memory 7 that specifies packet transmission outside the ring by the MAC packet from the terminal 13-3. It is assumed that When the packet (4) Mr1r2a1a2 (I0) arrives at the packet add, drop, and pass device 6-9, the lower address a2 of the source MAC address of the packet is the lower address that specifies the packet transmission outside the ring. Since the packet is stored in the memory 7, the source MAC address a1a2 of the packet is stored in the address table 8 that specifies the passage of the packet, and the packet is added, dropped, and passed through the counterclockwise ring 3-1. It is transferred via the device 6-10 as (6) Mr1r2a1a2 (I0) as shown in the figure and sent out to the outside of the ring by the apex device 5, and then sent to the router as (7) Mr1r2a1a2 (I0) as shown in the figure. Arrive at 22.
When the packet (7) Mr1r2a1a2 (I0) arrives at the router 22, the source MAC address a1a2 and source IP address I2 of the packet are stored in the memory 1 (not shown). The output port corresponding to the destination IP address I0 of the packet is found, and the packet is sent to that port. The packet is transferred by IPI2I0 (IP indicates an IP address, I2 indicates the IP address of the source mobile terminal 13-1, and I0 indicates the IP address of the destination server 20) and reaches the server 20. do.

Next, before the TCP mobile terminal 13-2 sends the communication start packet for the download packet reception service request to the server 20, a preprocessing packet (8) Mr1r2a3a2 (m) (I0) (M indicates an Ethernet packet, r1 is The upper MAC address of the interface of the router 22, r2 indicates the lower MAC address of the interface of the router 22, a3a2 indicates the upper MAC address a3 and lower MAC address a2, which are the MAC addresses of the terminal 13-1, and m is the preprocessing (I0 indicates the IP address of the destination server 20) is sent to the packet add, drop, and pass device 6-2. When the packet reaches the add, drop, and pass device 6-2 from the TCP mobile terminal 13-2 via the line concentrator 12-2, the lower address a2 of the packet's source MAC address is set as the packet passing MAC address. It is stored in the lower address memory 7-2 used during storage. The packet is forwarded by (9) Mr1r2a3a2 (m) (I0) in the counterclockwise optical ring 1-1 as shown in the figure, and the device 6-3 that adds, drops, and passes the packet, and the device 4 that connects to the upper ring. -1, and arrives at the packet add, drop and pass device 6-8 as (10) Mr1r2a3a2(m)(I0). When the packet sent outside the ring from the device 4-1 connected to the upper ring reaches the add, drop, and pass device 6-8, the lower address a2 of the source MAC address of the packet is set as the packet passing MAC. It is stored in the lower address memory 7-2 used when storing the address.

Next, an example will be shown in which the TCP terminal 13-1 sends packet (11) Mr1r2a1a2 (I0) to the packet add, drop, and pass device 6-1. When the packet reaches the add, drop, and pass device 6-1 from the TCP terminal 13-1, the lower address a2 of the source MAC address of the packet is set as the lower address that specifies the packet transmission outside the ring. Store in memory 7. The packet is transferred in the counterclockwise optical ring 1-1 by (12) Mr1r2a1a2 (I0) as shown in the figure, and arrives at the packet add, drop, and pass device 6-2.

When the packet (2) Mr1r2a1a2 (I0) arrives at the packet add, drop, and pass device 6-2, the lower address a2 of the source MAC address of the packet specifies sending the packet outside the ring at this point. However, since the lower address a2 of the source MAC address of the packet is stored in the lower address memory 7-2 used when storing the packet passing MAC address at this point, the above-mentioned The packet's source MAC address a1a2 is stored in the address table 8 that specifies the passage of the packet, and the packet is forwarded as shown in the figure by (13) Mr1r2a1a2 (I0) on the counterclockwise optical ring 1-1, and the packet (14)Mr1r2a1a2 (I0) arrive as.

When the packet (14) Mr1r2a1a2 (I0) arrives at the packet add, drop, and pass device 6-8, the packet is not a communication start packet, so the lower address a2 of the source MAC address of the packet is assigned to the packet. The lower address a2 of the source MAC address of the packet is stored in the lower address memory 7 that designates sending the packet outside the ring without erasing it from the lower address memory 7-2 used when storing the passing MAC address. The packet is transferred on the counterclockwise optical ring 3-1 and arrives at the packet add, drop, and pass device 6-9. In the packet add, drop, and pass device 6-9, the lower address a2 of the source MAC address a4a2 is stored in the lower address memory 7 that specifies packet transmission outside the ring by the MAC packet from the terminal 13-3. It is assumed that When the packet (4) Mr1r2a1a2 (I0) arrives at the packet add, drop, and pass device 6-9, the lower address a2 of the source MAC address of the packet is the lower address that specifies the packet transmission outside the ring. Since the source MAC address a1a2 of the packet is stored in the memory 7, the source MAC address a1a2 of the packet is stored in the address table 8 that specifies the passage of the packet, and the packet is added, dropped, and passed through the counterclockwise ring 3-1. It is transferred via the device 6-10 as (16) Mr1r2a1a2 (I0) as shown in the figure, and is sent out of the ring by the apex device 5, and is sent to the router as (17) Mr1r2a1a2 (I0) as shown in the figure. Arrive at 22.

When the packet (17) Mr1r2a1a2 (I0) arrives at the router 22, the source MAC address a1a2 and source IP address I2 of the packet are stored in the memory 1 (not shown). The output port corresponding to the destination IP address I0 of the packet is found, and the packet is sent to that port. The packet is transferred by IPI2I0 (IP indicates an IP address, I2 indicates the IP address of the source mobile terminal 13-1, and I0 indicates the IP address of the destination server 20) and reaches the server 20. do.

Next, the TCP mobile terminal 13-2 sends a communication start packet (18) Mr1r2a3a2 (I0) requesting download packet reception service to the server 20 to the packet add, drop, and pass device 6-2. When the packet reaches the add, drop, and pass device 6-2 from the TCP mobile terminal 13-2 via the line concentrator 12-2, the packet is a communication start packet, and the source MAC address of the packet is Since the lower address a2 of the packet passing MAC address is stored in the lower address memory 7-2 used when storing the packet passing MAC address, the lower address a2 is deleted and the lower address a2 of the source MAC address of the packet is transferred to the outside of the ring. It is stored in the lower address memory 7-1 that specifies packet transmission. The erasure of the lower address a2 stored in the lower address memory 7-2 used for storing the packet passing MAC address is indicated by a horizontal line drawn on the letter a2 in the figure. The packet is forwarded by (19) Mr1r2a3a2 (I0) in the counterclockwise optical ring 1-1 as shown in the figure, and is sent to the device 6-3 for adding, dropping, and passing the packet, and the device 4-1 connecting to the upper ring. The packet arrives at the packet add, drop and pass device 6-8 as (20) Mr1r2a3a2 (I0). When the packet sent outside the ring from the device 4-1 connected to the upper ring reaches the add, drop, and pass device 6-8, the packet is a communication start packet, and the source MAC of the packet is Since the lower address a2 of the address is stored in the lower address memory 7-2 used when storing the packet passing MAC address, delete the lower address a2 and move the lower address a2 of the source MAC address of the packet out of the ring. The packet is stored in the lower address memory 7-1 that specifies the packet transmission.
The packet is transferred on the counterclockwise optical ring 3-1 and arrives at the packet add, drop, and pass device 6-9. When the packet Mr1r2a3a2 (I0) arrives at the packet add, drop, and pass device 6-9, the lower address a2 of the source MAC address of the packet is stored in the lower address memory 7 that specifies packet transmission outside the ring. Therefore, the source MAC address a3a2 of the packet is stored in the address table 8 that specifies the passage of the packet, and the packet is sent to the counterclockwise ring 3-1 by the device 6- for adding, dropping, and passing the packet. 10, is transferred as (21) Mr1r2a3a2 (I0) as shown in the figure, is sent out of the ring by the apex device 5, and arrives at the router 22 as (22) Mr1r2a3a2 (I0) as shown in the figure. do.

When the packet (22) Mr1r2a3a2 (I0) arrives at the router 22, the source MAC address a3a2 and source IP address I2 of the packet are stored in the memory 1 (not shown). The output port corresponding to the destination IP address I0 of the packet is found, and the packet is sent to that port. The packet is forwarded by IPI3I0 (IP indicates an IP address, I3 indicates the IP address of the source mobile terminal 13-1, and I0 indicates the IP address of the destination server 20) as shown in the figure. and reaches the server 20.

Next, when the packet IPI0I3 (IP indicates an IP address, I3 indicates the IPv6 address of the terminal 13-2, and I0 indicates the IP address of the server 20) arrives at the router 22 from the server 20, the packet Copy the destination MAC address a3a2 of the destination IPv6 address I3 from the MAC address part of the destination IPv6 address, convert it into a MAC packet, and send the MAC packet (23) Ma3a2r1r2(I3) to the right via the apex device 5. It is sent to the rotating ring 3-2.

When the packet (24) Ma3a2r1r2 (I3) is transferred on the clockwise ring 3-2 and arrives at the packet add, drop, and pass device 6-9, the destination MAC address a3a2 of the packet is the packet passer. Since the packet is stored in the address table 8 specifying the address, the packet is sent forward in the clockwise direction.
When the packet Ma3a2r1r2 (I3) arrives at the packet add, drop, and pass device 6-8, the destination MAC address a3a2 of the packet is not stored in the address table 8 that specifies the pass of the packet, and the packet Since the lower address a2 of the destination MAC address is stored in the lower address memory 7-1 which designates packet transmission outside the ring, the packet is transmitted outside the ring as (25) Ma3a2r1r2(I3). The packet (25) Ma3a2r1r2 (I3) sent outside the ring is sent to the clockwise ring 1-2 by the device 4-1 connected to the upper ring, and is transferred as (26) Ma3a2r1r2 (I3) as shown in the figure. and arrives at the packet add, drop, and pass device 6-2.

When the packet (26) Ma3a2r1r2 (I3) arrives at the packet add, drop, and pass device 6-2, the destination MAC address a3a2 of the packet is not stored in the address table 8 that specifies the packet pass. , Since the lower address a2 of the destination MAC address of the packet is stored in the lower address memory 7-1 that specifies packet transmission outside the ring, the packet is transmitted outside the ring as (27) Ma3a2r1r2(I3). The packet reaches the terminal 13-2 via the line concentrator 12-2.

In the first embodiment, the packet Ma1a2r1r2 (I2) is sent clockwise to the packet add, drop, and pass device 6-2 with the lower address a2 stored in the lower address memory 7-2 used when storing the packet passing MAC address. The operation when arriving from ring 1-2 is shown. Since the lower address a2 of the destination MAC address of the packet is stored in the lower address memory 7-2 used when storing the packet passing MAC address, the destination MAC address a1a21 of the packet is stored in the address table specifying the passage of the packet. Then, the packet is sent to the front of the clockwise ring 1-2.
It is assumed that a packet with destination MAC address a3a2 destined for terminal 13-2 will not arrive from the server while lower address a2 is stored in lower address memory 7-2 used for storing packet passing MAC addresses.

There is one lower address memory 7-1 for specifying packet sending outside the ring of the packet add, drop, and pass device applied to the packet transfer system of the first embodiment. A second low-order address memory is provided for specifying packet transmission outside the ring, and is used separately for the case where it is read by a packet to be transferred and the case where it is read by a packet transferred from the clockwise ring. It is also possible to adopt a configuration in which the lower address of the source MAC address of the packet to be added is stored in the two memories. This enables high-speed operation of the device for adding, dropping, and passing packets.

Embodiment 1 is an example of a tree-like ring network, and when a lower address a2 is stored in the lower address memory 7-2 used to store the packet passing MAC address of a device for adding, dropping, and passing packets in the upper ring, The packet whose lower address a2 can be erased is only the communication start packet whose lower address of the source MAC address is a2, but if layer 2 cannot identify the communication start packet arriving from the terminal side, the tree-shaped ring network There are no operational examples and only one dual ring network operation is possible. However, if the line concentrator or base station identifies the communication start packet and displays it on layer 2, a tree-shaped ring network is also possible.

The lower address memory for specifying packet sending outside the ring of the device for adding, dropping, and passing packets in the ring network shown in FIG. 1 divides the lower address of the source MAC address of the packet into an upper part and a lower part, Addressing the SRAM with the parallel data of the logical sum of each bit of the latch output of the parallel data read from the position addressed in the SRAM of the memory system in the upper part and each bit of the parallel data decoded in the lower part. A memory that inserts and stores the lower part of the lower address of the source MAC address by storing it in the lower address position, bit 1 at the bit 1 position of decoding as bit 1 meaning lower address storage,
When deleting the lower address of the source MAC address from the lower address memory that specifies sending packets outside the ring, delete the lower address memory that specifies sending packets outside the ring with the upper part of the lower address of the source MAC address. A latch signal of the parallel data is output from the ring by ANDing each bit of the parallel data read from the addressed position and the bit inversion bit of each bit of the parallel data decoded from the lower part of the lower address of the source MAC address. By storing the lower part of the lower address of the source MAC address in the address specified position of the lower address memory that specifies packet transmission, insert bit 0 into the bit 1 position of decoding as bit 0, which means that the lower address is not stored. This is a low-order address memory for specifying packet adding, dropping, and passing of a packet to the outside of the ring of a ring network of a packet transfer system characterized by storing.

The configuration method of the lower address memory mentioned above is based on "Only the originating terminal address" in Communication method vol 113 No, 207, September 12-13, 2013 of IEICE Technical Report CS2013-28-CS2013-40. This is disclosed in Chapter 3, ``Address storage method using data storage areas as addresses'' on page 44 of ``Proposal of MAC-operated tree-like ring network that transfers packets in both directions''. It is also disclosed in Japanese Patent Application Laid-open No. 2019-097045 (address memorization method). This method can also be configured as shown in FIG.
Figure 2 shows the storage of bit 1, which means storing a lower address, and the bit 0, which means erasing a lower address, under the control of the bit 0 write signal (H), which is an erase signal of bit 1, which means storing a lower address. It works by switching the writing mode. To store/erase the lower address, the 32 bits of parallel data at the position specified by the upper part (17 bits) of the lower address of the MAC address is taken into the logic circuit, and the lower part (5 bits) of the lower address of the MAC address is stored in the SRAM. The 32-bit parallel data resulting from the calculation with the decoded signal is written to the SRAM again. The logic circuit is composed of a small LSI, FPGA, or ASIC, and uses external SRAM.

1-1, 2-1 Counterclockwise optical ring of edge node
1-2, 2-2 Clockwise optical ring of edge node 3-1 Counterclockwise optical ring of upper ring 3-2 Clockwise optical ring of upper ring 4-1, 4-2 Device 5 connected to upper ring Vertex device (vertex ring node)
6-1, 6-2, 6-3 Device for adding, dropping, and passing packets 7-1 Lower address memory 7-2 for specifying packet transmission outside the ring Lower address memory 8 used for storing packet passing MAC addresses Packet Address table specifying passage of 12-1, 12-2, 12-3 Base station 13-1, 13-2, 13-3 Terminal 20 Server 22 Router

Claims (3)

A plurality of packet add, drop, and pass devices are inserted into a ring network or a tree-like ring network, and a line concentrator or base station is connected to the packet add, drop, and pass device, and a terminal under the line concentrator , or the mobile terminal under the base station transfers an Ethernet (registered trademark) frame other than the OAM packet arriving from the clockwise ring of the ring network or using the MAC address part of the IPv6 address as the MAC address of the MAC packet. In order to communicate with a server connected via a router to a vertex device that blocks the passage of packets (hereinafter referred to as MAC packets), information is transferred within one domain to the router as UDP or TCP MAC packets, and the Between the router and the server is a packet transfer system for TCP packet transfer and UDP packet transfer to the terminal or the mobile terminal of a network that transfers IP packets,
Before the terminal or the mobile terminal receives service from the server, the lower address of the MAC address of the terminal or the mobile terminal is stored as the packet passing MAC address of the packet adding, dropping and passing device of the ring network. After a certain period of time has elapsed, a download request packet for a packet having the MAC address of the terminal or a download request packet for a packet having the MAC address of the mobile terminal is sent to the server, and the packet is stored in the lower address memory to be used. The lower address of the source MAC address of the packet is deleted from the lower address memory used when storing the packet passing MAC address of the device for adding, dropping, and passing packets in the ring network, and the lower address of the source MAC address of the packet is The device for adding, dropping and passing packets in a ring network is stored in a lower address memory that specifies the sending of packets out of the ring, directs the packet to the server through the counterclockwise ring, and sends the packet to the server via the counterclockwise ring. and when the packet arrives at a passing device, the lower address of the source MAC address of the packet is stored in the lower address memory used when storing the packet passing MAC address or in the lower address memory that specifies packet transmission outside the ring. means for storing the source MAC address of the packet in an address table specifying passage of the packet and directing the packet to a server;
When a packet other than the communication start packet from the server arrives at a device for adding, dropping, and passing packets via a clockwise ring, and the destination MAC address of the packet is stored in the address table that specifies packet passing. When the packet is sent to the front of the clockwise ring, the destination MAC address of the packet is not stored in the address table that specifies the passage of the packet, and the lower address of the destination MAC address of the packet is If the packet passing MAC address is stored in the lower address memory used when storing the packet passing MAC address, the destination MAC address of the packet is stored in an address table specifying the passing of the packet, and the packet is sent to the front of the clockwise ring; Other than the above, if the lower address of the destination MAC address of the packet is stored in the lower address memory that specifies sending the packet outside the ring, the packet is sent outside the ring, and the destination MAC address of the packet is A packet transfer system comprising means for sending the packet clockwise forward of the ring when the lower address of the packet is not stored in a lower address memory that specifies sending the packet outside the ring.
A lower address memory for specifying packet transmission outside the ring of a packet add, drop, and pass device applied to the packet transfer system according to claim 1, when read by a packet transferred in a counterclockwise ring. The source MAC address of the packet added to the ring is provided with a second lower address memory that specifies packet transmission outside the ring, and is used separately when the clockwise ring is read by a packet transferred. A lower address memory for specifying sending of a packet outside the ring of a packet adding, dropping and passing device, characterized in that a lower address of is stored in the two memories.
A plurality of packet add, drop, and pass devices are inserted into a ring network or a tree-like ring network, and a line concentrator or base station is connected to the packet add, drop, and pass device, and a terminal under the line concentrator , or packets (MAC In order to communicate with a server connected via a router to an apex device that blocks the passage of packets, information is transferred to the router within one domain as UDP or TCP MAC packets, and there is an IP address between the router and the server. A packet transfer method for TCP packet transfer and UDP packet transfer to the terminal or the mobile terminal of a network that transfers packets, the method comprising:
Before the terminal or the mobile terminal receives service from the server, the lower address of the MAC address of the terminal or the mobile terminal is stored as the packet passing MAC address of the packet adding, dropping and passing device of the ring network. After a certain period of time has elapsed, a download request packet having the MAC address of the terminal or a download request packet having the MAC address of the mobile terminal is sent to the server, and the source MAC of the packet is stored in the lower address memory to be used. The lower address of the address is erased from the lower address memory used when storing the packet passing MAC address of the device for adding, dropping, and passing packets of the ring network, and the lower address of the source MAC address of the packet is changed to the lower address of the packet of the ring network. A lower address specifying the sending of the packet out of the ring of the add, drop and pass device of the packet is stored in the memory to direct the packet through the counterclockwise ring to the server, and the packet is sent to the add, drop and pass device of the packet. , and if the lower address of the source MAC address of the packet is stored in the lower address memory used when storing the packet passing MAC address or in the lower address memory that specifies packet transmission outside the ring, storing the source MAC address of the packet in an address table specifying passage of the packet and directing the packet to a server;
When a packet other than the communication start packet from the server arrives at a device for adding, dropping, and passing packets via a clockwise ring, and the destination MAC address of the packet is stored in the address table that specifies packet passing. When the packet is sent to the front of the clockwise ring, the destination MAC address of the packet is not stored in the address table that specifies the passage of the packet, and the lower address of the destination MAC address of the packet is If the packet passing MAC address is stored in the lower address memory used when storing the packet passing MAC address, the destination MAC address of the packet is stored in an address table specifying the passing of the packet, and the packet is sent to the front of the clockwise ring; Other than the above, if the lower address of the destination MAC address of the packet is stored in the lower address memory that specifies sending the packet outside the ring, the packet is sent outside the ring, and the destination MAC address of the packet is If the lower address of the packet is not stored in a lower address memory that designates packet transmission outside the ring, the packet is transmitted clockwise to the front of the ring.