JPH11196100A - Method for setting connection in atm network - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a connection setting method, where high speed connection setting in end-end of an ATM network is attained and number of connections is decreased at the same time. SOLUTION: ATM switches 1, 2, 5 at each node of the ATM network have an IP over ATM function. When a connection is set by the ATM switches 1, 2, 5, the method has a process where a connection for routing information is set by an IP over ATM between adjacent ATM switches 1, 2, 5, and an ATM terminal and a process where routing according to a prescribed routing protocol is conducted on an IP using an IP over ATM after the connection is set.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for setting up a connection of an ATM switch in an ATM network capable of setting up a connection at a high speed and reducing the number of connections.

[0002]

2. Description of the Related Art One of the protocols for setting up a connection between ATM switches is pNNI (private network service).
k network interface). In this pNNI, hierarchical source routing is performed by forming a hierarchical Peer Group by collecting a plurality of nodes. Further, routing and connection setting are performed independently, and a connection is set end-to-end according to a request from the host. In addition, Classical IP over ATM, NH
RP (Next Hop Resolution Protocol), etc.
Classical IP over ATM uses LIS (Logical IP
ARP (Address Resolution Protocol) for each Subnet)
ol) A server is set up, and when a connection is set up, the server is accessed to obtain address information. Similarly, in the NHRP, an NHRP server is provided for each LIS, and the NHRP server exchanges information between the servers.

[0003]

When setting up a connection requiring the topology information of a network in an ATM switch, if a pure ATM network is considered,
It is necessary to perform resource management by notifying information such as link capacity, link hand propagation delay, usable bandwidth, guaranteed cell discard rate, number of passing connections, and used link cost at the same time as exchanging the inter-switch connection information using pNNI. There is. However, QOS (Qua
lity of Service) Only guarantees and resource management are needed,
A where ATM large capacity line and switching speed are required
In TM-LAN, unnecessary information increases in a routing table. In addition, in routing, pNNIs within each Peer Group, each Peer Group
Since the source routing is performed by the link state algorithm between switches, the switch must create a DTL (routing list) having a large data amount for each topology data.

In the above-mentioned Classical IP over ATM, the connection between the ATM-LAN and the ATM-LAN must be made via a router, and an ARP server is always required for NHRP.

Further, in the above-mentioned protocol, all connections are set end-to-end according to a request from a host even though the topology of the network is known. Also, in order to set all connections from end to end, VC (Vir
If the number of tual connections) becomes enormous and this is resolved by VC merging, the switch has the disadvantage that this must be done for each switch when setting up the connection.

The present invention has been made in view of such a problem, and an object of the present invention is to provide a connection setting method in an ATM network capable of simultaneously realizing a high-speed connection setting and a reduction in the number of connections.

[0007]

In order to achieve the above object, a connection setting method in an ATM network according to a first aspect of the present invention provides an ATM switch in each node of the ATM network having an IP over ATM function.
In setting up a connection by such an ATM switch, a step of setting up a connection for routing information between adjacent ATM switches and ATM terminals by IP over ATM, and after the connection is set up,
Performing routing according to a predetermined routing protocol on IP in IP over ATM.

[0008] A connection setting method in an ATM network according to a second aspect of the present invention includes a step of generating a routing table entry using the routing protocol operating on IP in IP over ATM; Setting a connection based on the routing table entry.

A connection setting method for an ATM network according to a third invention is the connection setting method for an ATM network according to the second invention, wherein the connection setting method for the other node is received when a connection setting request to another node is received. The call processing unit directly refers to the switching table entry to find a next node for setting a connection.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. In the existing LAN node protocol, I-mode is mainly used on the data link layer.
Network layer protocols such as P, IPX, and AppleTalk are used. Routing protocols that operate on these protocols include RIP (Routi
ng Information Protocol), OSPF (Open Sh
ortest Path Fast), BGP (Border Gateway)
Protocol).

In order to use these routing protocols on the ATM switch, IP (or IP) is placed on the ATM layer as a protocol stack of the ATM switch.
X, etc. ) Can be considered, but IPover ATM is one of the technologies to realize this. When a connection is set based on a routing table entry generated by a routing protocol as described later, the topology (configuration) of the network is a trigger for setting the connection.
It is called a driven system.

In the configuration of this embodiment, the connection for routing information is performed by the above-described IP ov in order to perform routing by the routing protocol used in the IP protocol.
Protocol set by erATM and IP of IP over ATM
A protocol for setting a connection based on the routing table entry generated by the above routing protocol, and an SVC (Switche) from the IP of IP over ATM.
d Virtual Connection), and an ATM layer control function for setting an ATM connection and a function for a call processing unit for SVC setting to refer to the routing table entry are added to the ATM switch.

In this embodiment, the routing protocol used in the IP protocol is used as it is on the ATM switch, the SVC is used for setting the ATM connection, and the call processing unit refers to the routing table entry generated by the routing protocol. By doing
End-to-end connection setting can be performed at high speed, and the number of connections can be reduced.

FIG. 1 shows an embodiment A to which an embodiment of the present invention is applied.
FIG. 2 is a diagram illustrating a configuration of a TM network. The network of FIG. 1 has ATM switches 1 to 5 and ATM terminals 11 to 1.
7, and the respective switches and terminals are connected by an ATM line.

Here, the ATM switch 1 will be described as an example. First, the ATM switch 1 uses IP over ATM at startup.
One connection is set for routing information between adjacent nodes and terminals (see FIG. 1). The connection may be set by a PVC (Permanent Virtual Connection) or by an ARP server or SVC. As shown in FIG. 2, after setting this connection, the ATM switch 1 performs routing over the existing routing protocol such as RIP, OSPF, and BGP over IP.
Performed by IP at ATM. At this time, the routing daemon 111 (111 ', 111-1), the TCP / IP1
12 (112 ', 112-1), ATM layer 113
(113 ′, 113-1), physical layer 114 (11
4 ', 114-1), the routing table entry 110 is generated by exchanging routing information between adjacent nodes and terminals. However, FIG. 2 shows only the exchange of routing information between the ATM switches 1 and 2, and between 1 and 5, but it is assumed that the routing is similarly performed in the adjacent ATM switch and ATM terminal. 116 (116 ', 116-1) is a call processing unit.

As a routing table entry of the ATM switch 1 (transmission destination: ATM terminal 16, relay node:
If the entry "ATM switch 5) is made, A
The TM switch 1 requests the ATM switch 5 to set up a connection to the ATM terminal 16 by SVC according to the connection setting protocol on the IP.

Here, a connection setting request is made to the ATM layer 113 by a protocol (connection setting daemon) 115 on IP in IP over ATM as shown in FIG. 3, and the ATM layer 113 sends this request to the physical layer 114. A request is sent to the call processing unit 116 without sending the request. The ATM switches 5 and 4 at the relay nodes receive the same connection setting request by the normal SVC, and the call processing units 116 'and 116 "receive the IPo.
ver Routing table entries 110 ', 1' generated by the routing protocol over IP in ATM.
It is assumed that the next node for setting a connection is obtained by directly referring to 10 ".

Similarly, as shown in FIG. 4, the ATM switch 1 automatically switches the ATM terminal (14, 15, 16, 17) other than the directly connected ATM terminal by using the optimal route in the topology driven manner. Connection (A,
B, C, D) are set by SVC.

In the ATM switch 1, the ATM terminals 11-1
When there is a connection request from S3 to the ATM terminal 16 by SVC, the switch is set so that data from each host flows to the already set connection to the ATM terminal 16. However, this requires that the ATM switch 1 has a function of VC merging (matching a plurality of connections to one path) as shown in FIG.

[0020]

According to the present invention, it is possible to use the IP routing protocol in the ATM switch, so that the speed of end-to-end connection setting and the number of connections can be reduced at the same time in the ATM network. Can be realized.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of an ATM network to which an embodiment of the present invention is applied.

FIG. 2 is a diagram showing a flow of a protocol stack and routing information of an ATM switch in the embodiment.

FIG. 3 is a diagram showing a flow of signaling information at the time of setting an SVC in the embodiment.

FIG. 4 is a diagram illustrating an example of a connection set in the present embodiment.

FIG. 5 is a diagram illustrating a state of a VC merge in the embodiment.

[Explanation of symbols]

1-4 ATM switch, 11-17 ATM terminal, 110, 110 ', 110 "routing table entry, 111, 111', 111-1 Routing daemon, 112, 112 ', 112-1 TCP / IP , 113, 113 ', 113-1 ... ATM layer, 114, 114', 114-1 ... physical layer, 115 ... connection setting daemon, 116, 116 ', 116-1, 116 "... call processing unit.

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification code FI H04Q 3/00 H04L 11/20 102D

Claims (3)

[Claims] An ATM switch in each node of an ATM network has an IP over ATM function. When a connection is set by such an ATM switch, a connection for routing information is set between an adjacent ATM switch and an ATM terminal. a connection setting method in an ATM network, comprising: a step of setting over an ATM, and a step of performing routing according to a predetermined routing protocol over IP in IP over ATM after the connection is set. . 2. A step of generating a routing table entry using the routing protocol operating on IP in IP over ATM, and setting up a connection based on the routing table entry. 2. The AT according to claim 1, further comprising the step of:
Connection setting method in M network. 3. When a request for setting a connection to another node is received, a call processing unit directly refers to the routing table entry to obtain a next node for setting a connection. Claim 2
The connection setting method in the ATM network described in the above.