CN1601997A - Ethernet group broadcasting method - Google Patents

Ethernet group broadcasting method Download PDF

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Publication number
CN1601997A
CN1601997A CN 200410040885 CN200410040885A CN1601997A CN 1601997 A CN1601997 A CN 1601997A CN 200410040885 CN200410040885 CN 200410040885 CN 200410040885 A CN200410040885 A CN 200410040885A CN 1601997 A CN1601997 A CN 1601997A
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multicast
device
ethernet
packet
source
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CN 200410040885
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CN100405783C (en
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宋舰
冉小庆
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迈普(四川)通信技术有限公司
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Abstract

In the method, source device sends multicast message to destination device. The said multicast message contains source MAC address, destination MAC address, and first id, which represents group of destination device of the multicast message. Comparing with traditional multicast mode, the bit map mode of using dstid (destination device id) reduces cost of device for maintaining Ethernet multicast address effectively, and raises efficiency of matching multicast address. In the disclosed technical scheme, a simple, high performance and reliable multicast transmission method based on Ethernet is provided inside mounting rack type devices. Under certain condition, communication can be expanded between hosts and devices within limited region.

Description

以太网组播方法 Ethernet multicast method

技术领域 FIELD

本发明涉及计算机网络通信领域,尤其涉及以太网内设备的组播报文传输方法。 The present invention relates to the field of computer network communications, in particular, to an Ethernet multicast packet transmission method apparatus.

背景技术 Background technique

对于以太网内部的数据通信,尤其是机架式设备内部数据传输,当主卡向多个线卡发送同一报文,或者一线卡向多个线卡发送同一报文时,如果采用单播的方式,将该报文多次发送,这样相同报文的多次传输既增加了网络负荷,也降低了发送方的效率。 For internal Ethernet data communications, especially internal data transfer equipment rack, when the primary card transmits the same message to a plurality of line card or line card sends the same message to a plurality of line cards, if a unicast manner , the packet is transmitted multiple times, so that multiple transmissions of the same packet as the network load increases, but also reduces the efficiency of the sender. 组播是一种受限制的广播方式,它具有组播报文一次发送、利用网络接口硬件检查帧的优点。 Multicast is a limited broadcasting, which has the advantage of a multicast message sent by the network interface hardware inspection frame. 但是如果采用传统的组播技术,应用程序必须分配一个组播地址。 But if the traditional multicast technology, the application must allocate a multicast address. 希望接收到组播消息的计算机的接口硬件必须配置为能够接收这个组播地址。 Want to receive multicast messages computer interface hardware must be configured to be able to receive this multicast address.

对于以太网,当地址中最高字节的最低位设置为1时表示该地址是一个组播地址,用十六进制可表示为01:00:00:00:00:0016(以太网广播地址ff:ff:ff:ff:ff:ff16可看作是以太网组播地址的特例)。 For Ethernet, when the highest byte lowest address bit is set to indicate that the address is a multicast address, hexadecimal 01 can be expressed as 1: 00: 00: 00: 00: 0016 (Ethernet broadcast address ff: ff: ff: ff: ff: ff16 be seen as a special case of Ethernet multicast address). 传统的以太组播需要维护相应的组播MAC地址,用户根据组播MAC地址来判断自己是否属于该组播组。 Traditional Ethernet multicast need to maintain a corresponding multicast MAC address, the user determines whether they belong to the multicast group according to a multicast MAC address. 对于成员有限的网络,虽然成员总数不大,但可能出现的组播组的数量还是会比较大,各个成员维护相应的组播MAC地址时既耗费资源,并且匹配组播MAC地址的效率也不高。 For a limited members of the network, although the total number of members is small, but the number of multicast groups that may appear still relatively large, each member to maintain the efficiency of resource-consuming when the corresponding multicast MAC address and the address does not match the multicast MAC high.

发明内容 SUMMARY

本发明所要解决的技术问题是,提供一种以太网内可靠数据传输方法,特别是为基于以太的卡间通信提供一种简单、高效、可靠的组播通信方法,以降低传统以太维护组播地址的复杂度,提高匹配组播地址的效率,克服传统以太组播不可靠的缺点。 The present invention solves the technical problem is to provide a reliable method for transmitting the Ethernet data, in particular to provide a simple, efficient and reliable method for multicast communication based on communication between Ethernet card, to reduce maintenance conventional Ethernet multicast address complexity, improve the efficiency of the matching multicast address, to overcome the conventional drawbacks Ethernet multicast unreliable.

本发明解决所述技术问题所采用的技术方案是,提供一种以太网组播方法,源设备向目的设备发送组播报文,所述组播报文包含源MAC地址、目的MAC地址,所述组播报文还包含第一标识,所述第一标识用于表征该组播报文的目的设备组。 Technical Solution The present invention solves the technical problem is to provide a method for Ethernet multicast, the multicast packet source device to a destination device to send the multicast packet includes a source MAC address, destination MAC address, the said multicast packet further comprises a first identifier, the first identifier is used to characterize the multicast packet to the destination device group.

所述组播报文还包含第二标识,所述第二标识用于表征发送该组播报文的源设备。 The multicast message further comprises a second identifier, the second identification device for characterizing the transmission source of the multicast packet. 所述第一标识的bit位不少于该以太网内的设备的数目,且每一设备对应至少一个bit位。 The bit less than the number of bits of the first identification device in the Ethernet, and each device corresponding to the at least one bit. 所述第一标识的bit位不少于该以太网内的设备的数目,且每一设备对应一个bit位。 The bit less than the number of bits of the first identification device in the Ethernet, and one bit corresponding to each device. 具体的说,包括以下步骤:a.发送组播报文的源设备将报文的目的MAC地址全填F,源MAC地址填源设备的MAC地址,在第一标识中标注目的设备,进入缓存队列,发送;b.以太网内设备收到报文后,通过读取第一标识,判断目的设备组中是否包括本设备,若包含则接收该报文,若不包含则丢弃该报文。 Specifically, comprising the steps of:. A multicast packet sending source device of the packet destination MAC address to fill the whole F., Source MAC address MAC address of the source device to fill denoted by the object identification device in a first, into the cache queue, the transmission;. b within the Ethernet device receiving the packets by reading the first identifier, the destination device determines whether a group including the present apparatus, if the packets are received comprising, if the packet is discarded comprising. 还包括以下步骤:c.源设备在第二标识中标注源设备;d.目的设备接收组播报文后,若发现报文序号乱序,则向组播该报文的源设备发送NAK报文;e.源设备收到NAK报文后,重发组播报文。 Further comprising the step of:.. C source apparatus in a second labeled source device identifier; D object device after receiving a multicast packet, if the packet sequence number found shuffled, then the multicast packet to the source device sends a NAK message text;. E source device after receiving the NAK packet, retransmit multicast packets. 所述设备为机架式设备。 The device is a rack-mounted equipment.

本发明的有益效果是,通过采用了dstid(目标设备列表)用以标识组播地址,这种位图的方式和使用传统的组播相比,有效减少了设备维护以太组播地址的代价,提高了匹配组播地址的效率。 Advantageous effect of the invention is to identify the multicast address by using the dstid (target apparatus list), and such a bitmap using conventional multicast mode as compared to effectively reduce the cost of maintenance of the Ethernet multicast address, improve the efficiency of the matching multicast addresses. 采用本发明的技术方案可以在机架式设备内部提供一种基于以太的简单、高效、可靠的组播传输方法。 Aspect of the present invention may provide a device based on Ethernet rack inside a simple, efficient, and reliable multicast transmission method. 并在一定条件下可扩充到有限范围内的主机(或设备)间通信。 And under certain conditions it may be expanded to a host (or device) within a limited communication range between.

以下结合附图和具体实施方式对本发明作进一步的说明。 Hereinafter, the present invention will be further described in conjunction with the accompanying drawings and specific embodiments.

附图说明 BRIEF DESCRIPTION

图1是本发明一个实施例,机架式设备结构图。 FIG 1 is an example, the structure of FIG rack apparatus of the present embodiment of the invention.

图2是本发明的第二标识dstid示意图。 FIG 2 is a second schematic identification dstid invention.

图3是线卡接收数据报文的流程。 FIG. 3 is a line card receives data packets flow.

具体实施方式 detailed description

本文所述的以太网内设备是指具有以太网MAC地址的设备,或者说,是以太网的组成单元。 The Ethernet device herein refers to the device with an Ethernet MAC address, or that is a constituent unit of Ethernet.

本发明改进传统以太组播通过以太MAC地址作为组播地址的方式,在传统以太报文中增加了第一标识srcid和第二标识dstid两个字段用做内部组播地址标识,接收方将根据dstid和srcid判断自己是否属于该报文的组播成员以及报文的发送方。 The present invention improves the conventional Ethernet via an Ethernet multicast MAC address as the multicast address the way, in the conventional Ethernet packets added to the first identification and second identification dstid srcid two fields used for internal multicast address ID, according to the recipient dstid and srcid determine whether they were members of a multicast packet and the sender of the message. 在正确接收组播报文后,接收方并不向源发送确认报文,而是在接收到乱序的组播报文时,接收方才发送NAK报文告知发送方出现错误,请求重传。 After correctly receiving the multicast packets, the receiver does not send the acknowledgment packet to the source, but upon receiving the multicast packet out of order, the receiver sends the NAK message just to inform the sender errors, retransmission is requested. 也就是说,如果组播报文发送成功,发送方将不会收到NAK报文,此时根据队列门限或者时间门限两种方法进行发送缓存队列的释放。 That is, if multicast packet sent successfully, the sender will not receive a NAK packet, this time limit or time thresholds are two ways to release the transmit buffer queue according to the queue door.

下面详细描述本发明中对应的内部地址标识和缓存队列释放方法:1.地址标识为减少对以太组播地址的维护以及对组播地址的高效匹配,我们增加了dstid和srcid两个字段用做内部组播地址标识,其中:dstid:目标设备列表,2字节(可扩充)。 Internal address identifier and queue buffer corresponding to the release process of the invention is described below in detail: 1. address is identified as to reduce maintenance of the Ethernet multicast address and multicast address matching efficient, we added dstid and two fields used srcid internal multicast address ID, wherein: dstid: a target device list, 2 bytes (expandable). 以位图方式标识线卡,即每bit代表一个设备,最多同时支持15个设备(当设备数大于15时可扩充dstid字节数)。 In bitmap card identification line, i.e., each bit represents a device, while supporting up to 15 devices (greater than the number of devices can be expanded when the number of bytes dstid 15). 最低bit位对应线卡1,第N位对应线卡N+1,通过这种方式对各线卡赋予地址标识。 The lowest bit corresponds to the bit line card 1, the bit corresponding to the N th line card N + 1, the address mark in this way to impart to each line card. dstid最高有效位表示报文是否属于组播报文(1表示报文是组播报文,0表示报文是单播报文)。 dstid most significant bit indicates whether the packet belongs to the multicast packet (a packet is considered multicast packet, 0 indicating that the message is a unicast packets). dstid中其余bit位置1表示对应的设备属于组播组。 dstid remaining bit positions 1 indicates that the corresponding devices belonging to the multicast group. 接收方根据组播报文中本设备对应的dstid位判断自己是否属于该组播组。 The multicast packet receiving side corresponds to the device of the present dstid discriminates whether or not they belong to the multicast group. 例如二进制10000001 00001010(0x810A)表示线卡2、4、9属于本次组播组。 Such as binary 10000001 00001010 (0x810A) indicates the line card belongs to this multicast group 2,4,9.

srcid:源设备id,2字节,直接以线卡卡号(槽位号)赋值。 srcid: source device id, 2 bytes, directly to the line card number (slot number) assignment.

源设备发送组播报文时:目的MAC填全F,源MAC填本线卡MAC,dstid填本次组播设备列表,srcid填源设备卡号。 When the source device sends multicast packets: fill full destination MAC F, source MAC present fill line card MAC, dstid fill this multicast device list, srcid fill source device number.

线卡发送对组播报文的响应时:目的MAC填该组播报文的发送方MAC,源MAC填本卡MAC,dstid填本次组播设备列表,srcid填本卡卡号(如线卡1卡号为1),组播发送方将根据响应报文中的dstid字段判断该响应报文是否属于组播响应报文,并找到对应的组播发送进程,根据srcid字段判断响应报文的源。 The line card sends a response to the multicast packets: to fill the destination MAC multicast packet sender MAC, MAC source fill this card MAC, dstid fill this multicast device list, srcid fill this card number (e.g., line card 1 card 1), the sender multicast response packet according to the response message dstid field determining whether the multicast response packet, and finds the corresponding multicast transmission process, according to the response packet is determined srcid field source .

对于dstid,其应当能够表征一台或多台设备。 For dstid, which should be able to characterize one or more devices. 例如,如果网内共有N台设备,则每一台设备都应当能够在dstid内以某种形式得到描述。 For example, if a total of N network devices, then each device should be able to obtain some form described in dstid. 最简单的例子是,如果有共有7台设备,则dstid以7个bit位分别对应(代表)这7台设备,如果某一设备属于组播对象,则其对应为置1,不属于则置0。 The simplest example is, if there are seven devices, the dstid to 7 bits corresponding bit (representative) device 7 which, if the device belongs to a multicast object, which corresponds to set 1, the counter does not belong to 0. 反之亦可。 And vice versa.

当局域网范围内的主机(或设备)可以通过管理人员进行编号,以适应dstid和srcid的设计思路时,我们可以进一步将本方案扩充到一定范围、传输相对可靠(误码率低)的局域网环境中使用。 When the host (or devices) within the range of the local area may be numbered by management personnel to meet design ideas and srcid dstid, we can further expand the range of the present embodiment, a relatively reliable transmission (bit error rate) LAN environment use. 编号方法可以采用固定管理员主机对网内所有主机动态分配编号(主机启动便向管理员主机申请编号)的方式,也可以采用固定主机编号的方式,管理员为每一台主机分配一个固定的、独一无二的编号。 No method may be fixed to the administrator all hosts within the network host dynamic allocation number (host-initiated Bianxiang administrator host application number), the number of fixed host embodiment may be used, administrator assigns a fixed number for each host , unique number.

以下以一款机架式路由交换机进行说明。 The following routing switch with a rack explained. 系统含13张线卡,通过1000M以太连接,如图1所示。 The system containing the line card 13, connected via Ethernet 1000M, as shown in FIG.

以线卡13发送组播组成员为线卡2、4、9的组播报文为例:1.构造报文,目的MAC填全F,源MAC填线卡13的MAC,dstid填0x810A,具体dstid地址示意图见图2,srcid填13,将报文进入缓存队列,发送;2.所有线卡收到组播报文后,判断dstid中本卡对应的位是否为1,如果为1表明本卡属于本报文中的组播组,接收此报文,如果为0则丢弃报文;3.当线卡2、4、9接收组播报文后,如果发现报文序号乱序(报文号大于预期报文号),则根据srcid向组播报文发送方(线卡13)发送NAK报文,该报文目的MAC填线卡13的MAC,源MAC填本卡MAC,dstid为本组播报文的dstid,即0x810A,srcid填本卡的卡号,报文类型为NAK,报文内容包含预期收到的报文序号N(R);4.线卡13收到NAK报文,根据dstid和N(R),从该序号起将对应的组播报文重新发送;5.线卡2、4、9收到组播报文后,若发现该报文已经接收(报文号小于预期 A line card 13 transmits multicast group members as the line card 2,4,9 multicast packets Example: 1 configuration packet, the destination MAC address to fill the whole F., Source MAC MAC 13 of the fill line card, dstid fill 0x810A, DETAILED dstid address is shown in Figure 2, SrcID fill 13, the packet queue into the cache, transmitting; 2 all the line cards receive the multicast packet, determining dstid present whether the bit corresponding to the card 1, 1 indicates that if this card is a newspaper article in the multicast group, receiving the packet, if the packet discarding is 0; 2,4,9 line card 3 when receiving a multicast packet, if it is found out of order packet sequence number (packet. symbol greater than the expected number of packets), then the multicast packet sender (line card 13) sends a NAK message according to srcid group, MAC MAC fill line card 13 the packet object, the present card fill source MAC MAC, dstid of this multicast packet dstid, i.e. 0x810A, srcid fill this card the card number, type of NAK message, the message contents of the received message contains the expected sequence number N (R);. 4 line card 13 receiving the NAK packet, the dstid and N (R), from this number corresponding multicast packet resend; 5 2,4,9 line card received multicast packet, if that packet has been received (message number less than expected 报文号),直接丢弃报文,如果一切正常(报文序号正常,属于该接收的报文),则不往线卡13发送任何报文,线卡接收数据报文的流程如图3所示;6.线卡13一直未收到线卡2、4、9发来的NAK报文,则认为线卡2、4、9已经成功接收报文;本组播方案采用X.25的流控方式,故障检测采用保活报文的方式,因这些内容不涉及创新部分,故在此不再赘述。 Packet number), the packet is discarded, if everything is normal (normal packet sequence number, the received packets belonging to), not the line card 13 to transmit any packet, the line card receives data packets flow shown in Figure 3 shown;. 6 line card line card 13 has not received a 2,4,9 NAK message sent is considered 2,4,9 line card has been successfully received packets; this program uses the multicast stream of X.25 mode control, fault detection using keepalive manner, because these did not involve the innovative part, it is not repeated here.

Claims (7)

1.以太网组播方法,源设备向目的设备发送组播报文,所述组播报文包含源MAC地址、目的MAC地址,其特征在于,所述组播报文还包含第一标识,所述第一标识用于表征该组播报文的目的设备组。 1. Ethernet multicast method, a source device to a destination device to send a multicast packet, the multicast packet includes a source MAC address, destination MAC address, wherein said multicast packet further comprises a first identifier, the first identifier is used to characterize the multicast packet to the destination device group.
2.如权利要求1所述的以太网组播方法,其特征在于,所述组播报文还包含第二标识,所述第二标识用于表征发送该组播报文的源设备。 2. The method according to Ethernet multicast claimed in claim 1, characterized in that said multicast packet further comprises a second identifier, the second identification device for characterizing the transmission source of the multicast packet.
3.如权利要求1所述的以太网组播方法,其特征在于,所述第一标识的bit位不少于该以太网内的设备的数目,且每一设备对应至少一个bit位。 3. The method according to Ethernet multicast claimed in claim 1, wherein said bit less than the number of bits of the first identification device in the Ethernet, and each device corresponding to the at least one bit.
4.如权利要求1所述的以太网组播方法,其特征在于,所述第一标识的bit位不少于该以太网内的设备的数目,且每一设备对应一个bit位。 4. The method according to Ethernet multicast claimed in claim 1, characterized in that the number of devices in the Ethernet bit identification is not less than the first bit, and one bit corresponding to each device.
5.如权利要求1所述的以太网组播方法,其特征在于,包括以下步骤:a.发送组播报文的源设备将报文的目的MAC地址全填F,源MAC地址填源设备的MAC地址,在第一标识中标注目的设备,进入缓存队列,发送;b.以太网内设备收到报文后,通过读取第一标识,判断目的设备组中是否包括本设备,若包含则接收该报文,若不包含则丢弃该报文。 5. The method according to Ethernet multicast claimed in claim 1, characterized by comprising the steps of:. A multicast packet sending source device of the packet destination MAC address to fill the whole F., Source MAC address of the source device to fill MAC address, the destination identification label in the first device into the buffer queue, the transmission;. b after the device receives an Ethernet packet, by reading the first identifier, the destination device determines whether a group including the present apparatus, when comprising the packets are received, the packet is discarded if it contains.
6.如权利要求5所述的以太网组播方法,其特征在于,还包括以下步骤:c.源设备在第二标识中标注源设备;d.目的设备接收组播报文后,若发现报文序号乱序,则向组播该报文的源设备发送NAK报文;e.源设备收到NAK报文后,重发组播报文。 6. The method of multicast Ethernet according to claim 5, characterized in that, further comprising the step of:.. C source apparatus in a second labeled source device identifier; d destination device receives the multicast packets, if found packets out of order sequence number, it sends a NAK message to the source device's multicast packet;. E source device after receiving the NAK packet, retransmit multicast packets.
7.如以上任一权利要求所述的以太网组播方法,其特征在于,所述设备为机架式设备。 7. The method of any preceding claim Ethernet multicast claim, wherein the device is a rack-mounted equipment.
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