JP3070583B2 - ATM network broadcast communication method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ATM (Asynchro
The present invention relates to a nous transfer mode (asynchronous transfer mode) network, and particularly to a broadcast / multicast communication method in an ATM network.

[0002]

2. Description of the Related Art MARS (M
As shown in FIG. 3, a VC (virtual channel) mesh (mesh) method for broadcast (broadcast) and multicast (selective broadcast) communication using an ulticast Address Resolution Server (multicast address resolution server). And MCS (MultiCast Ser
ver; multicast server) method. Note that the multicast communication distributes the same information to a plurality of nodes. A multicast address is set, a point-to-multipoint connection is set, and the point-to-multipoint connection is set. Data is sent to multiple nodes just by sending information to the connection. In the broadcast communication, a specific broadcast address is used to simultaneously broadcast to all nodes on the network.

In the VC mesh method, each MARS client is set as a root, and MARS
Point-to-multipoint VC with client as leaf
Set t VC) in a mesh. For this reason, MARS
As the number of clients increases, the total number of VCs becomes enormous, and terminals that implement MARS clients,
On the ATM switch, a large amount of resources for securing VC information is consumed. In addition, SVC (SwitchedVirtual
(Connection) A large amount of control messages for VC setting, such as signaling for canceling setting, etc., travel around the network, which causes an increase in network traffic.

As a result, congestion of the network has occurred, and the performance of MARS clients and ATM switches has been reduced.

As shown in FIG. 3 (b), in the MCS system for transferring data to all MARS Clients (MARS Clients) via an MCS (Multicast Server),
MARS, MAR for broadcast communication
In addition to the S client, a new server called an MCS (multicast server) needs to be prepared, and resources for the MCS must be secured.

[0006]

As described above, the MA
In broadcast and multicast communication using RS, in the VC mesh (mesh) method, MARS is used.
As the number of clients increases, VCC increases and V
It consumes a large amount of resources for securing C information, further increases network traffic due to control messages for VC setting, and causes MARS clients and A
There is a problem that the performance of the TM switch is reduced.

Also, the MCS system has a problem that in order to perform broadcast communication, it is necessary to newly provide an MCS in addition to the MARS and the MARS client, and it is necessary to secure resources for the MCS. I have.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made in view of the above problems, and an object of the present invention is to provide a broadcast communication method for reducing required VC information storage capacity and reducing network traffic by control messages. To provide.

[0009]

In order to achieve the above-mentioned object, the present invention provides a MARS (Multicast Address Resolut
In an ATM network including a multicast address resolution server and a plurality of MARS clients, an existing point-to-multipoint VC existing between MARS and MARS clients is used for broadcast or multicast communication. It was made.

[0010]

Embodiments of the present invention will be described. The present invention relates to MARS (Mull over ATM networks).
In broadcast communication using a ticast Address Resolution Server (multicast address resolution server), MARS is made to transfer data addressed to the broadcast, thereby improving the efficiency of the broadcast communication.

MARS is a server used for performing broadcast communication in an ATM network.

[0012] Here, MARS itself does not handle transmission and reception of data messages addressed to broadcasts.
RS client (MARS Client), MCS (MultiCa
It manages information consisting of a broadcast address of a Layer 3 protocol registered by a stServer (multicast server) and an ATM address, and only transmits and receives control messages therefor.

In the broadcast communication in the conventional method, each MARS client uses a mesh (mess).
h) above, point-to-multipoint VC (point
VC to set tomultpoint Virtual Connection)
This is performed using the mesh method or the MCS method of transferring data to all MARS clients via the MCS.

As shown in FIG. 2, between the MARS and the MARS client, the MARS transmits a control message to all the MARS clients.
"Cluster Control V
C) "point-to-multipoint (poi)
(nt to multipoint) VC always exists.

In the present invention, the point-to-multipoint VC, which is a cluster control VC, is used for broadcast communication to improve efficiency.

[0016] Layer 3 protocol (Layer 3 protocol)
l) Upon receiving a data message transmission request from the module, the MARS client checks the destination address of the message. If the destination is a broadcast destination (broadcast address), the point-to-point communication between the MARS and the MARS client is performed.・ Point V
A message is sent to MARS using C (point to point VC).

The MARS that has received the message from the MARS client transfers the message to the cluster control VC as it is if the message is not a control message.

The message sent on the cluster control VC reaches all MARS clients.

If the message received from the cluster control VC is not a control message, the MARS client transfers the message to the upper layer 3 protocol module.

[0020]

An embodiment of the present invention will be described. FIG.
FIG. 2 is a diagram illustrating a configuration of an example of the present invention. MARS client that sends and receives data messages (MARS Clie
nt), MARS (Multicast Address Resolution Server) which manages multi / broadcast addresses and ATM addresses and transfers data addressed to broadcasts.
r; a multicast address resolution server), an MCS (MultiCast Server) for transferring data to a multicast / broadcast address, and an ATM switch.

The operation of one embodiment of the present invention will be described. First, the MARS client receives a message transmission request from an upper layer 3 protocol module.

MAR receiving the message transmission request
The S client checks the destination address of the message.

If the destination address is a broadcast address, as shown in FIG. 2, the message is transmitted using a point-to-point VC established between the MARS client and MARS.

The MARS that has received the message from the MARS client checks the type of the message, and if it is not a control message, transmits the data using the Cluster Control VC (Cluster Control VC) as it is.

The message sent on the cluster control VC is received by all MARS clients.

The MARS client receiving the message from the cluster control VC discards the message if it is a message transmitted by itself,
If the message is transmitted from the ARS client, the message is transferred to the upper layer 3 protocol module.

The data communication between the MARS and the MARS client using the Cluster Control VC (Cluster Control VC) can be applied not only to the broadcast communication but also to the multicast communication.

In a network where the amount of data traffic addressed to broadcast and multicast is small,
The MARS client sends a message to MARS without using the VC mesh method or the MCS method when there is a request to send a message addressed to multicast or broadcast. In MARS receiving the message,
Using the cluster control VC, forward the message to all MARS clients.

In the MARS client receiving the message addressed to the multicast from the cluster control VC, if the message does not belong to the corresponding multicast group, the message is discarded. If the message belongs, the upper layer 3 protocol module is used. Forward the message to

Further, according to the judgment of the MARS client, it is possible to arbitrarily select whether to use the communication method of the present invention or the conventional VC mesh method or MCS method for the data message addressed to the multicast or broadcast.

For example, only the broadcast communication uses the communication method of the present invention, the multicast communication uses the VC mesh method or the MCS method, or the communication method of the present invention and the conventional VC mesh method or the MCS method according to the traffic volume. The system can be switched.

As a condition to be determined by the MARS client, a traffic amount or a method of statically setting according to the determination of the network administrator can be used.

[0033]

As described above, according to the present invention, the following effects can be obtained.

A first effect of the present invention is that the storage capacity of VC information can be reduced.

A second advantage of the present invention is that network traffic due to control messages is reduced.

The reason is that in the present invention, MARS
And broadcast communication or multicast communication using a cluster control VC (Cluster Control VC) which is always set between the client and all MARS clients, it becomes unnecessary to secure new resources for broadcast communication, This is because the storage capacity and network traffic can be reduced.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating an example of a system configuration of a network according to an embodiment of the present invention.

FIG. 2 is a diagram for explaining an embodiment of the present invention.

3A is a conventional VC mesh method, and FIG.
FIG. 3 is a diagram for explaining a CS system.

[Explanation of symbols]

MARS Multicast Address Resolution Server, Multi / Multicast MCS Multicast Server

Claims (2)

(57) [Claims] 1. A MARS (Multicast Address Resolutio)
n Server including a multicast address resolution server) and a plurality of MARS clients
In the TM network, (a) a MARS client receives a request for transmission of a message addressed to a broadcast from an upper layer 3 protocol module, and sends a request to the MARS using a point-to-point VC established between the MARS client and the MARS. (B) The MARS that received the message checks the type of the message, and if it is not a control message, the MARS as it is is a Cluster Control VC (ClusterControl).
(C) a message is sent on the cluster control VC; the message sent on the cluster control VC is received by the plurality of MARS clients; (d) each of the plurality of MARS clients A broadcast communication method comprising: discarding a message transmitted by itself, and transmitting a message to a higher layer 3 protocol module if the message is transmitted from another MARS client. 2. MARS (Multicast Address Resolutio)
n Server including a multicast address resolution server) and a plurality of MARS clients
In a TM network, (a) a MARS client receives a request for transmission of a message addressed to multicast from an upper layer 3 protocol module, and sends a request to MARS using a point-to-point VC established between the MARS client and MARS. (B) In MARS receiving the message, the type of the message is checked, and if it is not a control message, the message is sent to Cluster Control VC (Cluster Control Trunk).
ol VC), and (c) each of the plurality of MARS clients receiving the message addressed to the multicast from the cluster control VC does not belong to the corresponding multicast group. Discard the message, and if it belongs to the corresponding multicast group, forward the message to the upper layer 3 protocol module. A multicast communication method, comprising: