KR20150091637A

KR20150091637A - Method for esasi pdu transmitting in trill network

Info

Publication number: KR20150091637A
Application number: KR1020140012091A
Authority: KR
Inventors: 은진수
Original assignee: (주)유비쿼스
Priority date: 2014-02-03
Filing date: 2014-02-03
Publication date: 2015-08-12

Abstract

The present invention relates to a method for transmitting an end station address distribution information (ESADI) protocol date unit (PDU) under a TRILL network environment, which carries MAC information of a plurality of different VLANs in one ESADI PDU and transmits the ESADI PDU at once, thereby preventing the generation of excessive ESADI messages. The present invention comprises the steps of: receiving information of a plurality of host MACs from one or more transmission nodes; determining an ESADI PDU from the received information of the host MACs; changing an ESADI PDU parsing rule of the host MAC recognized as the ESADI PDU; and transmitting the ESADI PDU, of which the parsing rule is changed, to a destination routing bridge (RBridge). The information of one or more VLAN MACs are carried in one ESADI PDU and transmitted to the destination RBridge.

Description

[0001] METHOD FOR ESASI PDU TRANSMITTING IN TRILL NETWORK [0002]

The present invention relates to an ESADI PDU (End Station Address Distribution Information Protocol Date Unit) transmission method in a trill network environment, and more particularly, to an ESADI PDU in which multiple ESADI PDUs contain MAC information of a plurality of different VLANs, To an ESADI PDU transmission method in a trill network environment capable of preventing a message from being generated.

Spanning Tree Protocol (STP), widely used in DCs (Data Centers), is a Layer 2 (L2) network standard recommended by the Internet Engineering Task Force (IETF), which avoids loops by eliminating redundant links, A bandwidth is wasted.

In order to solve the problem of the STP, TRILL (Intermediate Interconnection of Lots of Links) solves the L2 loop problem by maintaining the L2 multipath by introducing the IS-IS (Intermediate System to Intermediate System) routing protocol.

On the other hand, the RBridge (Routing Bridge) in which the TRILL protocol is operated on the TRILL network is called a device, and hosts and servers in which RBridge is operated artificially are called End Station or End System (ES). A method of activating the ESADI (End Station Address Distribution Information or End System Address Distributing Information) as a method of acquiring a MAC address is the most preferred method. This is because the ESADI activation method carries out the registration process only for the authorized ES, which is good for security and provides a quick update to the MAC address of the ES.

However, when a topology change occurs when TRILL ESADI is used in a multi-tenant configuration or when a new RBridge is added, an excessive number of ESADI messages flow into the TRILL network, thereby increasing the bandwidth There is a problem that a situation of encroachment may occur.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above problem and to provide an ESADI PDU transmission method capable of reducing a bandwidth used by TRILL ESADI traffic by collecting a plurality of different VLAN MAC information in one TRILL ESADI PDU at a time, Method.

According to an aspect of the present invention, there is provided a method for transmitting an ESADI PDU (End Station Address Distribution Information Protocol Date Unit) to a destination RBridge in an RBridge (Routing Bridge) in a TRIIL (Transparent Interconnection of Lots of Links) Receiving a plurality of host MACs from one or more sending nodes, determining from the received plurality of host MAC information that they are ESADI PDUs, determining an ESADI PDU parsing rule of the host MAC that is recognized as an ESADI PDU And transmitting an ESADI PDU of the changed parsing rule to the destination RBridge, wherein the one ESADI PDU may be transmitted to the destination RBridge including one or more VLAN MAC information.

Also, the step of determining that the plurality of host MACs are ESADI PDUs can recognize that the ESADI PDUs are derived from the Dest MAC information of the Inner Ethernet Header.

In addition, the ESADI PDU parsing rules The changing step recognizes the VALN ID field of the MAC Reachability TLV without recognizing the inner VLAN tag of Inner Ethernet Header.

And, in the step of transmitting to the destination RBridge, the MAC Reachability TLV may be added to another VLAN ID to transmit MAC Reachability information of multiple VLANs to one PDU.

The ESADI PDU transmission method in the trill network environment according to the present invention can control the transmission of an excessive number of ESADI PDUs to the network by reducing the bandwidth used by TRILL ESADI traffic.

Also, an RBridge that supports the modified ESADI PDU format and an RBridge that does not support it can operate in the same network.

In addition, the operator can determine whether to use the changed ESADI PDU format.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram schematically showing a connection relationship between general TRILL networks,
2 is a diagram schematically showing a connection relationship with an ESADI RBridge in a general TRILL network,
3 is a program diagram illustrating an ESADI PDU format according to an embodiment of the present invention.
FIG. 4 is a detailed diagram illustrating an ESADI payload portion in an ESADI PDU format according to an embodiment of the present invention.
5 is a flowchart illustrating an ESADI PDU transmission method according to an embodiment of the present invention.

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail. It should be understood, however, that the invention is not intended to be limited to the particular embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

When an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, but there may be other elements in between It should be understood.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. It is to be understood that the terms "comprises" or "having" in this application are intended to specify the presence of stated features, integers, steps, operations, elements, parts, or combinations thereof, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, parts, or combinations thereof.

Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the meaning in the context of the relevant art and are to be construed as ideal or overly formal in meaning unless explicitly defined in the present application Do not.

In order to facilitate understanding of the present invention, examples of terms used to describe selected members in the context of embodiments and implementations will be described first herein.

Packet: A packet is a node in which the nodes are divided into packets.

Link: A link is a conceptual representation of the ability of two or more nodes to communicate with each other. The link may be wired or wireless.

Path / Route: A path / route is a sequence of one or more links.

Network: A network is a set of nodes that can communicate with each other through any combination of wired and wireless links.

BRidge: A node that simultaneously joins more than one mesh network at a time, for example, a node that is immediately connected to at least two mesh networks. The bridge node allows nodes that are connected (or part of the first mesh) to the first mesh to communicate with nodes that are connected to (or are part of) the second mesh.

Routing Bridge (RBridge or RB): refers to a device that performs the TRILL protocol within the TRILL network

Unicast: Unicast is communication between two nodes.

Broadcast: Broadcast is a communication intended to reach multiple nodes from one node. The broadcast may not reach all intended nodes.

Multicast: Multicast is a method in which a single person who is connected to an information network (LAN) or the Internet sends information to several people, and several people who receive it transmit the same contents to a bucket relay To a plurality of persons so that the information can be transmitted to a specific plurality of persons who propagate the information.

Flood: A flood is a broadcast sent by a node that is eventually ribcoded by all other nodes that receive the broadcast.

Routing Protocol: A routing protocol is a set of mechanisms implemented on each node of a mesh network. When mechanisms discover information about the network and other nodes are multi-hop from each node, To communicate with the nodes.

First, with reference to Figs. 1 and 2, the key points of the technical idea provided by the present invention will be described in order to facilitate understanding of the present invention.

FIG. 1 is a diagram schematically illustrating a connection relationship between general TRILL networks, and FIG. 2 is a view schematically showing a connection relationship with an ESADI RBridge in a general TRILL network.

1, one interface of the RB2 21 is connected to the IP network 25 in the TRILL network 1 and the other interfaces are located in the TRILL network 1 20, and the RB2 21) corresponds to BRB of the TRILL network 1 (20). Likewise, RB6 27 is the BRB of TRILL network 3 30 and RB3 32 and RB5 37 are the BRB of TRILL network 2 35.

On the other hand, hosts and servers that artificially operate RBridge are called End Stations (ES), where RBridge must learn the MAC address of the ES. The way in which the RBridge learns MAC addresses is to activate ESADI (End Station Address Distribution Information or End System Address Distributing Information) (sharing MAC information with each other via the ESADI protocol).

ESADI is advantageous in security because it only carries out the registration procedure, and it provides a quick update to the MAC address of the ES. TRILL-related variables and MAC addresses are transmitted by TRILL IS-IS Protocol Date Unit (PDU).

2, ESADI RB 40, 42, 44, 46 means that the corresponding RB is designated as a VLAN-X forwarder and participates in the ESADI protocol. RB 1 40, RB 2 (42), RB3 (44), and RB4 (46). The RB in the TRILL ESADI (50) is a Transit RB, and recognizes and forwards the ESADI frame as a multicast TRILL data frame. All ESADI RBs (40, 42, 44, 46) are interconnected by a virtual shared link for a particular VLAN, where the calculation and determination of routing by ESADI is made There is also no Hello frame exchange between the ESADI RBs (40, 42, 44, 46).

Hereinafter, an ESADI PDU transmission method in a trill network environment according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

First, the RBridge described below can be understood as an RBridge that uses an ESADI RBridge (ESADI PDU) aggregation function unless otherwise specified.

FIG. 1 is a program diagram showing an ESADI PDU format according to an embodiment of the present invention. FIG. 2 is a program diagram showing an ESADI payload part in detail in an ESADI PDU format according to an embodiment of the present invention. FIG. 8 is a flowchart illustrating an ESADI PDU transmission method according to an embodiment.

1 and 2, the ESADI PDU 100 includes an Outer Ethernet header 110, a TRILL header 120, and an inner Ethernet header 110, in the same manner as a general TRILL packet. Ethernet Header 130). The ESADI PDU 100 includes an IS-IS Common header in the ESADI Payload 140 and a MAC Reachability TLV 145 under the IS-IS Common header.

The Inner Ethernet Header 130 may include Inner VLAN Tag Information 135. In addition, the MAC Reachability TLV 145 may include a nickname, a VLAN ID 147, and a MAC address 148.

Referring to FIGS. 1 to 3, an RBridge (Routing Bridge) may receive a host MAC from a transmitting node (S100). The transmitting node and the host MAC may be one or more nodes and one or more host MACs.

Next, the RBridge may determine from the received host MAC information that an arbitrary host is the ESADI PDU 100 (S120). The host MAC information may be Dest MAC information of the Inner Ethernet Header 130.

Next, if it is determined from the Dest MAC information of the arbitrary host Inner Ethernet Header 130 that the ESADI PDU 100 is the ESADI PDU 100, the RBridge can change the parsing rule of the ESADI PDU 100 to be transmitted to the destination RBridge ). That is, when it is determined that the ESADI PDU 100 is the RBridge, the RBridge does not recognize the Inner VLAN Tag information 135 of the Inner Ethernet Header 130 but instead recognizes the VLAN ID field 147 of the MAC Reachability TLV 145 To change it. The reason for this change is that if the RBridge recognizes the Inner VLAN Tag Information 135, only one VLAN MAC Reachability information is represented in one ESADI PDU 100, so that the MAC Reachability information of the other VLAN is converted to the destination RBridge To transmit, another packet must be created and sent.

Next, if the ESADI PDU (100) parsing rule is changed, the RBridge may add the MAC Reachability TLV 145 to another VLAN ID (S160). That is, the RBridge is capable of storing MAC reliability information of multiple VLANs in one ESADI PDU 100. Accordingly, Rbridge can transmit the ESADI PDU 100 to the destination RBridge at a time with the MAC Reachabity information of the multiple VLANs in one ESADI PDU 100 (S180).

On the other hand, when it is not judged that the ESADI PDU 100 is from the Dest MAC information of the Inner Ethernet Header 130, the RBridge can be processed in the same manner as a general TRILL packet. That is, the RBridge may generate different packets for each VLAN and transmit the MAC Reachability information to the destination RBridge (S130, S180).

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be construed as limiting the scope of the invention as defined by the appended claims. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention.

100: ESADI PDU 110: Outer Ethernet Header
120: TRILL Header 130: Inner Ethernet Header
135: Inner VLAN Tag Information 140: ESADI Payload
145: MAC Reachability TLV 147: VLAN ID field
148: MAC Address

Claims

A method for transmitting an ESRII (End Station Address Distribution Information) PDU (Protocol Date Unit) to a destination RBridge in an RBridge (Routing Bridge) in a TRIIL (Transparent Interconnection of Lots of Links) network environment,
Receiving a plurality of host MACs from one or more sending nodes;
Determining from the received plurality of host MAC information that it is an ESADI PDU;
The ESADI PDU parsing rule of the host MAC recognized as the ESADI PDU ; And
And transmitting the ESADI PDU of the changed parsing rule to the destination RBridge, wherein the one ESADI PDU is transmitted to the destination RBridge including one or more VLAN MAC information. Way.

The method according to claim 1,
In the step of determining that the plurality of host MACs are ESADI PDUs,
And the RBridge recognizes the ESADI PDU from the Dest MAC information of the Inner Ethernet Header.

The method according to claim 1,
The above ESADI PDU parsing rule In the changing step,
Wherein the RBridge does not recognize the Inner VLAN Tag of the Inner Ethernet Header and the RBridge recognizes the VALN ID field of the MAC Reachability TLV.

The method according to claim 1,
In the step of transmitting to the destination RBridge,
Wherein the RBridge transmits MAC Reachability information of the plurality of VLANs to the destination RBridge by adding the MAC Reachability TLV to the one PDU with a different VLAN ID.