WO2012081631A1 - スイッチング装置、その上位装置、ネットワーク及びパケット転送方法 - Google Patents
スイッチング装置、その上位装置、ネットワーク及びパケット転送方法 Download PDFInfo
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- WO2012081631A1 WO2012081631A1 PCT/JP2011/078940 JP2011078940W WO2012081631A1 WO 2012081631 A1 WO2012081631 A1 WO 2012081631A1 JP 2011078940 W JP2011078940 W JP 2011078940W WO 2012081631 A1 WO2012081631 A1 WO 2012081631A1
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- 238000012546 transfer Methods 0.000 title claims abstract description 36
- 238000000034 method Methods 0.000 title claims description 12
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- 238000004891 communication Methods 0.000 claims description 12
- 238000001914 filtration Methods 0.000 claims description 6
- 230000004044 response Effects 0.000 claims description 4
- 230000006870 function Effects 0.000 description 11
- 238000012545 processing Methods 0.000 description 9
- 238000010586 diagram Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 4
- 230000032683 aging Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 238000006424 Flood reaction Methods 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L49/00—Packet switching elements
- H04L49/10—Packet switching elements characterised by the switching fabric construction
- H04L49/113—Arrangements for redundant switching, e.g. using parallel planes
- H04L49/118—Address processing within a device, e.g. using internal ID or tags for routing within a switch
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- 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
- H04L45/74—Address processing for routing
- H04L45/745—Address table lookup; Address filtering
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L49/00—Packet switching elements
- H04L49/10—Packet switching elements characterised by the switching fabric construction
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L49/00—Packet switching elements
- H04L49/10—Packet switching elements characterised by the switching fabric construction
- H04L49/111—Switch interfaces, e.g. port details
Definitions
- the present invention is based on the priority claim of Japanese patent application: Japanese Patent Application No. 2010-280600 (filed on Dec. 16, 2010), the entire contents of which are incorporated herein by reference. Shall.
- the present invention relates to a switching device, its host device, a network, and a packet transfer method. And a packet transfer method.
- Patent Document 1 discloses a layer 2 switch (hereinafter, also simply referred to as L2 and L3) for realizing a function for determining an output port based on an IP address with a small number of resources.
- the FDB (Forwarding Data Base) 123 that manages each of the plurality of input / output units in association with a predetermined IP address, and the input transmission information input to any of the plurality of input / output units is a destination.
- the IP address as the destination of the input transmission information included in the input transmission information and any of a plurality of input / output units different from the input / output unit to which the input transmission information is input are supported by the FDB 123
- one of the plurality of input / output units associated by the FDB 123 with the output destination of the input transmission information Configuration is disclosed comprising an output port determination section 122 that.
- Non-Patent Documents 1 and 2 disclose a technique called open flow in which an open flow controller centrally controls a switch group by updating a flow table held by each switch. The relationship with the present invention will be described in detail later.
- the present invention has been made in view of the above-described circumstances, and an object of the present invention is a switching device that can realize packet transfer based on an IP address with a simple configuration, and also supports a multicast IP address.
- An object of the present invention is to provide a switching device, a host device, a network, and a packet transfer method that can be used.
- a forwarding table in which a plurality of input / output ports, an IP address, and a port to which a packet destined for the IP address is output is associated, and the forwarding table is referred to.
- a packet that forwards the received packet from the port associated with the destination IP address of the received packet and updates the forwarding table using the source IP address of the received packet and the port that received the received packet.
- a transmission / reception control unit wherein a plurality of ports can be associated with one IP address in the forwarding table, and the packet transmission / reception control unit associates a plurality of ports with one IP address.
- a switching device is provided that forwards received packets from the plurality of associated ports. That.
- the entry when an entry matching the destination IP address of the received packet is not found in the forwarding table, the entry is set in the forwarding table in the higher-level device via the communication unit.
- a switching device that inquires an entry to be updated and updates a forwarding table based on a response from the host device, and a host device that responds to the switching device with an entry to be set in the forwarding table.
- a network including the above switching device is provided.
- a switching device comprising a plurality of input / output ports, a forwarding table in which a multicast IP address and a port to which a packet destined for the multicast IP address is to be output are associated.
- a forwarding table in which a multicast IP address and a port to which a packet destined for the multicast IP address is to be output are associated.
- the present invention it is possible to realize packet transfer based on an IP address, particularly a multicast IP address, with a simple configuration.
- a switching device associates a plurality of input / output ports 130 to 13n with an IP address and a port to which a packet destined for the IP address is to be output.
- the forwarding table 12 and referring to the forwarding table 12, forward the received packet from the port associated with the destination IP address of the received packet, and the source IP address of the received packet and the port that received the received packet And a packet transmission / reception control unit 11 that updates the transfer table 12 using.
- a plurality of ports can be associated with one IP address, and when the packet transmission / reception control unit 11 associates a plurality of ports with one IP address, Received packets are transferred from a plurality of associated ports.
- the reference numerals of the drawings attached to this summary are attached to the respective elements for convenience as an example for facilitating understanding, and are not intended to limit the present invention to the illustrated embodiment.
- the switching device of the present invention it is possible to cope with multicast addresses determined respectively in IPv4 and IPv6.
- FIG. 2 is a diagram illustrating a configuration of the switching device 10 according to the first embodiment of the present invention.
- a configuration including a packet transmission / reception control unit 11, a transfer table 12, a plurality of input / output ports 130 to 13n, and filters 140 to 14n provided for the respective input / output ports 130 to 13n. It is shown.
- converters for analog-digital conversion of data input / output from the input / output ports 130 to 13n are omitted.
- input / output ports 130 to 13n are ports connected to other switching devices, external host devices, and the like to input / output IP packets (and ARP packets).
- the interface type is not particularly limited as long as an existing standard such as copper wire or light is used.
- Filters 140 to 14n are filters for filtering packets sent from the packet transmission / reception control unit 11 to the input / output ports 130 to 13n according to the on / off setting. Specifically, each of the filters 140 to 14n has an area for storing an IP address and a subnet mask for clearly indicating a subnet address (IPv4 example: 10.11.12.xx). Of the IP packets sent from the transmission / reception control unit 11, an IP packet having a destination address corresponding to the subnet address is passed, but the rest is discarded. On the other hand, in the off state, the filters 140 to 14n do not perform the filtering operation and pass the IP packet sent from the packet transmission / reception control unit 11.
- Such filters 140 to 14n can be formed as an internal block of an LSI (Large Scale Integration) in which the packet transmission / reception control unit 11 and the transfer table are incorporated.
- the on / off of the filters 140 to 14n and the setting of the filter range can be changed via the packet transmission / reception control unit 11 or the like.
- the forwarding table 12 is a memory that can have a maximum of m IP address entries (m is a natural number). Each entry can hold a maximum of p port numbers (p ⁇ n) for one IP address.
- the packet transmission / reception control unit 11 searches the forwarding table 12 using the destination IP address portion of the received packet input from the filters 140 to 14n. As a result of the search, when an entry having the same IP address as the destination IP address is found (hit), the packet transmission / reception control unit 11 transmits the received packet to one or a plurality of ports recorded as a pair with the IP address. . On the other hand, if no entry having the same IP address as the destination IP address is found as a result of the search (miss), the packet transmission / reception control unit 11 broadcasts to all ports.
- the packet transmission / reception control unit 11 updates the forwarding table 12 with the transmission source IP address of the received packet and the port number of the received port as a set regardless of whether or not the corresponding entry is found by the search. Specifically, when the transmission source IP address is not registered in the forwarding table 12, the packet transmission / reception control unit 11 adds a new entry. If the transmission source IP address is registered in the forwarding table 12 and a different port number has already been registered, the packet transmission / reception control unit 11 performs processing for adding the port number received this time to the corresponding entry.
- the details of the output port determination process and the transfer table update process by the packet transmission / reception control unit 11 as described above are almost the same as the frame transfer, learning, and flooding by the MAC address table (forwarding table) in the normal L2 switching device. Details are omitted.
- FIG. 4 is a diagram for explaining the operation (during normal transfer) of the switching device according to the first embodiment of this invention. In the following description, it is assumed that a packet whose destination IP address is A and whose source IP address is B is input to the switching device 10.
- the output destination of the packet is port # 1.
- the packet transmission / reception control unit 11 outputs the packet to the filter # 1 side to which the port # 1 is connected.
- the filter # 1 is off or the subnet address set in the filter # 1 matches the destination IP address of the received packet.
- the packet is output from port # 1, as shown in FIG.
- the packet transmission / reception control unit 11 updates the forwarding table 12 using the transmission source IP address of the packet and the input port (port # 0). As a result, a new entry in which the IP address B is associated with the port # 0 is added to the forwarding table 12.
- FIG. 5 is a diagram for explaining an operation at the time of flooding of the switching device described above. In the following description, it is assumed that an unknown packet whose destination IP address is C and whose source IP address is D is input to the switching device 10.
- the packet transmission / reception control unit 11 broadcasts (floods) the packet from all ports (ports # 1 to #n in FIG. 5) other than port # 0.
- filters # 1 to #n are turned off, or the subnet addresses set in filters # 1 to #n match the destination IP address of the received packet.
- the packet is output from each of the ports # 1 to #n as shown in FIG.
- the packet transmission / reception control unit 11 updates the forwarding table 12 using the transmission source IP address D of the packet and the input port (port # 0). As a result, port # 0 is newly added to the entry of IP address D in the forwarding table 12.
- FIG. 6 is a diagram for explaining the operation (when the filter function is activated) of the switching device according to the first embodiment of the present invention.
- a packet having a destination IP address A of 10.1.1.14 and a source IP address of B is input to the switching device 10.
- Port # 1 is connected to a higher-level device that should not transfer broadcast packets. Therefore, it is assumed that the filter # 1 is set to the filter function ON, and 10.254.0.0 is set as the IP address and 255.255.0.0 is set as the subnet mask.
- the filter # 1 When a packet is input from the packet transmission / reception control unit 11, the filter # 1 receives the destination IP address (10.1.13.14) of the input packet and the subnet address 10.254. xxx. xxx is matched. Since the packet input from the packet transmission / reception control unit 11 does not match the subnet address set in the filter # 1, the filter # 1 discards the packet input from the packet transmission / reception control unit 11.
- the packet transmission / reception control unit 11 uses the transmission source IP address B of the packet and the input port (port # 0) to determine the forwarding table 12 regardless of whether or not the packet output by itself is discarded. Update.
- layer transfer processing equivalent to the L2 switching device is performed.
- 3 switching can be performed, and furthermore, since a plurality of destination ports can be stored in the forwarding table 12, it is also possible to handle a multicast IP address.
- An entry having a multicast IP address may be registered in the forwarding table 12 in advance, or a configuration in which settings are received from a higher-level device as in a second embodiment described later can be employed.
- the filters 141 to 14n are arranged at each port so that on / off or a subnet address can be set as necessary, so that a broadcast packet is not transmitted to a host device. .
- the example in which the filters 141 to 14n are arranged at each port has been described. However, it is also possible to determine a port to be connected to a host device and install a filter only at that port. .
- MAC Media Access Control
- the switching device 10 of the above-described embodiment is arranged in a network having a looping path such as a mesh structure, a broadcast storm occurs.
- the switching device 10 implements a spanning tree protocol as in the case of the layer 2 switching device, and selects a route to form a logical hub and spoke network.
- This spanning tree protocol is well known to those skilled in the art, and since it differs from the point of the present invention, its details are omitted.
- the switching device 10 is connected to a hub-and-spoke network, the above-described measures are not necessary.
- FIG. 7 is a diagram illustrating a configuration of a switching device 10a according to the second embodiment of the present invention.
- the difference from the switching device 10 of the first embodiment shown in FIG. 2 is that the operation of the packet transmission / reception control unit 11a is different, and the host device communication unit 15 is added. Since the other configuration is substantially the same as that of the first embodiment, a description will be added focusing on the difference.
- the packet transmission / reception control unit 11 searches the forwarding table 12 and there is no entry corresponding to the destination IP address of the received packet, the broadcast is performed.
- the packet transmission / reception control unit 11a performs a process of requesting an entry corresponding to the destination IP address of the received packet from the host device via the host device communication unit 15.
- the higher-level device communication unit 15 Based on a request from the packet transmission / reception control unit 11a, the higher-level device communication unit 15 requests an entry to be stored in the transfer table with respect to a higher-level device (not shown) and a predetermined protocol, and sends the received entry to the packet transmission / reception control unit. The process of handing over to 11a is performed.
- any device that can create an entry corresponding to the destination IP address that is, a device that can answer from which of the input / output ports of the switching device 10a it is appropriate to output the packet. That's fine.
- the OpenFlow controller described in Non-Patent Documents 1 and 2 having a function of responding to a route creation request from a subordinate switch based on the network topology can be used as the host device.
- communication is performed with the switching device 10a using the OpenFlow protocol that is the host device.
- the switching device 10a receives the collation rule (matching rule) received from the OpenFlow controller and the processing content (transfer from one or more designated ports, etc.) applied to the flow.
- a flow entry in which a predetermined action is combined is received, but only a necessary part may be extracted from the flow entry and registered in the transfer table 12.
- the switching device 10a can be configured to satisfy the specifications of the OpenFlow switch of Non-Patent Document 2, and the operation as in the first and second embodiments described above and the operation as an OpenFlow switch can be performed. Each may be executed.
- the host device communication unit 15 as described above can be realized by mounting a CPU (Central Processing Unit) and a memory on the switching device 10a and executing a computer program that executes communication processing with the host device. .
- a CPU Central Processing Unit
- IGMP snooping processing can be realized by allowing a host device to respond appropriately to an entry including a plurality of input / output ports for a received packet having a multicast IP address. It becomes.
- the switching device 10a has been described as including the filters 140 to 14n.
- broadcast storms can be suppressed by setting the forwarding table 12 from the host device, so It is also possible to omit the filters 140 to 14n.
- the present invention is not limited to the above-described embodiments, and further modifications and replacements are possible without departing from the basic technical idea of the present invention. -Adjustments can be made.
- the configuration of the forwarding table shown in the above embodiment is an example, and there is no particular limitation on the form as long as the correspondence relationship between the IP address and one or more ports can be managed.
- the aging function for erasing the entry of the forwarding table 12 after a certain time has been described.
- the packet transmission / reception control unit 11 May be deleted (an entry having an IP address that has not received a received packet for a predetermined time). In this case, unnecessary transfer due to old entries remaining in the transfer table 12 can be suppressed, and an improvement in network performance can be expected.
- the filters 140 to 14n have been described as performing filtering using a subnet address.
- the conditions set for the filter may be set as appropriate. Is possible. For example, it is possible to set a condition for allowing only a predetermined control packet to pass through for a port to which a host device is connected.
- the packet transmission / reception control unit is a switching device that deletes an entry having an IP address that has not received a received packet for a predetermined time from the forwarding table.
- a communication unit that communicates with the second host device When the packet transmission / reception control unit does not find an entry that matches the destination IP address of the received packet in the forwarding table, the packet transmission / reception control unit inquires of the host device about the entry to be set in the forwarding table via the communication unit. A switching device that updates a forwarding table based on a response from the host device.
- one or more of the input / output ports among the input / output ports, a port connected to a host device, and the packet transmission / reception control unit are blocked except for packets having a predetermined IP address.
- a filter unit that blocks other than a packet having a predetermined IP address is arranged, A switching device capable of setting on / off of a filter function and filtering contents to be instructed in the filter unit by instructing the packet transmission / reception control unit.
- the packet transmission / reception control unit deletes an entry having an IP address that has not received a received packet for a predetermined time from the forwarding table.
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Abstract
Description
本発明は、日本国特許出願:特願2010-280600号(2010年12月16日出願)の優先権主張に基づくものであり、同出願の全記載内容は引用をもって本書に組み込み記載されているものとする。
本発明は、スイッチング装置、その上位装置、ネットワーク及びパケット転送方法に関し、特に、OSI(Open Systems Interconnection)参照モデルのレイヤ3(ネットワーク層)の情報で転送処理を行うスイッチング装置、その上位装置、ネットワーク及びパケット転送方法に関する。
以下の分析は、本発明によって与えられたものである。
しかしながら、上記特許文献1の構成では、IPアドレスと入出力部との対応関係を1対1で対応付けて管理するものであるため(同公報の段落0022、図4参照)、マルチキャストIPアドレスに対応できないという問題点がある。
続いて、本発明の第1の実施形態について図面を参照して詳細に説明する。図2は、本発明の第1の実施形態のスイッチング装置10の構成を示す図である。図2を参照すると、パケット送受信制御部11と、転送テーブル12と、複数の入出力ポート130~13nと、これら入出力ポート130~13n毎に設けられたフィルタ140~14nとを備えた構成が示されている。なお、図2においては、入出力ポート130~13nから入出力されたデータをアナログ-デジタル変換する変換器は省略されている。
図4は、本発明の第1の実施形態のスイッチング装置の動作(通常転送時)を説明するための図である。また、以下の説明では、宛先IPアドレスがA、送信元IPアドレスがBであるパケットがスイッチング装置10に入力されたものとして説明する。
図5は、上記したスイッチング装置のフラッディング時の動作を説明するための図である。また、以下の説明では、宛先IPアドレスがC、送信元IPアドレスがDである未知のパケットがスイッチング装置10に入力されたものとして説明する。
図6は、本発明の第1の実施形態のスイッチング装置の動作(フィルタ機能作動時)を説明するための図である。また、以下の説明では、宛先IPアドレスAとして10.1.13.14、送信元IPアドレスがBであるパケットがスイッチング装置10に入力されたものとして説明する。また、ポート#1は、ブロードキャストパケットを転送すべきでない上位装置に接続されているものとする。このためにフィルタ#1は、フィルタ機能オンに設定され、IPアドレスとして10.254.0.0と、サブネットマスクとして255.255.0.0がそれぞれ設定されているものとする。
続いて、本発明の第2の実施形態について図面を参照して詳細に説明する。図7は、本発明の第2の実施形態のスイッチング装置10aの構成を示す図である。図2に示した第1の実施形態のスイッチング装置10との相違は、パケット送受信制御部11aの動作が異なる点と、上位装置通信部15が追加されている点である。その他の構成は第1の実施形態と略同様であるので、以下その相違点を中心に説明を加える。
[第1の形態]
(上記第1の視点によるスイッチング装置参照)
[第2の形態]
第1の形態において、
前記パケット送受信制御部は、前記転送テーブルに、受信パケットの宛先IPアドレスと一致するエントリが見つからなかった場合、当該受信パケットを受信したポート以外のポートから前記受信パケットをマルチキャストするスイッチング装置。
[第3の形態]
第1または第2の形態において、
さらに、前記入出力ポートのうち1つ以上の入出力ポートと前記パケット送受信制御部との間に、所定の条件に適合するパケット以外を遮断するフィルタ部を配置したスイッチング装置。
[第4の形態]
第1または第2の形態において、
前記複数の入出力ポートと前記パケット送受信制御部との間に、所定の条件に適合するパケット以外を遮断するフィルタ部を配置し、
前記パケット送受信制御部に指示することにより、前記フィルタ部に、フィルタ機能のオンオフと、指示するフィルタリング条件とを設定可能であるスイッチング装置。
[第5の形態]
第1から第4いずれか一の形態において、
前記パケット送受信制御部は、所定時間、受信パケットを受信しなかったIPアドレスを持つエントリを、前記転送テーブルから削除するスイッチング装置。
[第6の形態]
第1の形態において、
さらに、第2の上位装置と通信する通信部を備え、
前記パケット送受信制御部は、前記転送テーブルに、受信パケットの宛先IPアドレスと一致するエントリが見つからなかった場合、前記通信部を介して、前記上位装置に、前記転送テーブルに設定すべきエントリを問い合わせ、前記上位装置からの応答に基づいて転送テーブルを更新するスイッチング装置。
[第7の形態]
第6の形態において、
さらに、前記入出力ポートのうち前記入出力ポートのうち1つ以上の入出力ポートと上位装置と接続されたポートと前記パケット送受信制御部との間に、所定のIPアドレスを持つパケット以外を遮断するフィルタ部を配置したスイッチング装置。
[第8の形態]
第6の形態において、
前記複数の入出力ポートと前記パケット送受信制御部との間に、所定のIPアドレスを持つパケット以外を遮断するフィルタ部を配置し、
前記パケット送受信制御部に指示することにより、前記フィルタ部に、フィルタ機能のオンオフと、指示するフィルタリング内容とを設定可能であるスイッチング装置。
[第9の形態]
第6から第8いずれか一の形態において、
前記パケット送受信制御部は、所定時間、受信パケットを受信しなかったIPアドレスを持つエントリを、前記転送テーブルから削除するスイッチング装置。
[第10の形態]
(上記第2の視点による上位装置参照)
[第11の形態]
(上記第3の視点によるネットワーク参照)
[第12の形態]
(上記第4の視点によるパケット転送方法参照)
なお、上記した第10~第12の形態は、第1の形態と同様に、第2~第9の形態に展開することが可能である。
本発明の全開示(請求の範囲を含む)の枠内において、さらにその基本的技術思想に基づいて、実施形態ないし実施例の変更・調整が可能である。また、本発明の請求の範囲の枠内において種々の開示要素(各請求項の各要素、各実施形態ないし実施例の各要素、各図面の各要素等を含む)の多様な組み合わせ、ないし、選択が可能である。すなわち、本発明は、請求の範囲を含む全開示、技術的思想にしたがって当業者であればなし得るであろう各種変形、修正を含むことは勿論である。
11、11a パケット送受信制御部
12 転送テーブル
15 上位装置通信部
130~13n 入出力ポート
140~14n フィルタ
Claims (10)
- 複数の入出力ポートと、
IPアドレスと、当該IPアドレスを宛先とするパケットを出力すべきポートとを対応付けた転送テーブルと、
前記転送テーブルを参照して、受信パケットの宛先IPアドレスに対応付けられたポートから受信パケットを転送するとともに、前記受信パケットの送信元IPアドレスと、前記受信パケットを受信したポートとを用いて前記転送テーブルを更新するパケット送受信制御部と、を備え、
前記転送テーブルには、一つのIPアドレスに対し複数のポートを対応付けることが可能であり、
前記パケット送受信制御部は、一つのIPアドレスに対し複数のポートが対応付けられている場合、前記対応付けられた複数のポートから受信パケットを転送するスイッチング装置。 - 前記パケット送受信制御部は、前記転送テーブルに、受信パケットの宛先IPアドレスと一致するエントリが見つからなかった場合、当該受信パケットを受信したポート以外のポートから前記受信パケットをマルチキャストする請求項1のスイッチング装置。
- さらに、前記入出力ポートのうち1つ以上の入出力ポートと前記パケット送受信制御部との間に、所定の条件に適合するパケット以外を遮断するフィルタ部を配置した請求項1または2のスイッチング装置。
- 前記複数の入出力ポートと前記パケット送受信制御部との間に、所定の条件に適合するパケット以外を遮断するフィルタ部を配置し、
前記パケット送受信制御部に指示することにより、前記フィルタ部に、フィルタ機能のオンオフと、指示するフィルタリング条件とを設定可能である請求項1または2のスイッチング装置。 - 前記パケット送受信制御部は、所定時間、受信パケットを受信しなかったIPアドレスを持つエントリを、前記転送テーブルから削除する請求項1から4いずれか一のスイッチング装置。
- さらに、上位装置と通信する通信部を備え、
前記パケット送受信制御部は、前記転送テーブルに、受信パケットの宛先IPアドレスと一致するエントリが見つからなかった場合、前記通信部を介して、前記上位装置に、前記転送テーブルに設定すべきエントリを問い合わせ、前記上位装置からの応答に基づいて転送テーブルを更新する請求項1のスイッチング装置。 - 前記パケット送受信制御部は、所定時間、受信パケットを受信しなかったIPアドレスを持つエントリを、前記転送テーブルから削除する請求項6のスイッチング装置。
- 請求項6または7のスイッチング装置からの要求に応じて、前記スイッチング装置の転送テーブルに設定するエントリを応答する上位装置。
- 請求項1から7いずれか一のスイッチング装置を含んで構成されるネットワーク。
- 複数の入出力ポートと、マルチキャストIPアドレスと当該マルチキャストIPアドレスを宛先とするパケットを出力すべきポートとを対応付けた転送テーブルと、を備えるスイッチング装置が、
前記転送テーブルを参照して、受信パケットの宛先IPアドレスに設定されたマルチキャストIPアドレスに対応付けられた複数のポートから受信パケットを転送するステップと、
前記受信パケットの送信元IPアドレスと、前記受信パケットを受信したポートとを用いて前記転送テーブルを更新するステップとを含む、パケット転送方法。
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EP11849882.3A EP2654255A4 (en) | 2010-12-16 | 2011-12-14 | Switching device, higher-order device thereof, network and packet transfer method |
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