[3]可选的是VLAN-tagged 可以插入到MACSource address和Length/type之间4字节,构成VLAN-tagged MAC 帧 MAC帧定义 Pause Frames 接收端产生一个pause frame指示当前传输遇到拥堵,发送端需要停止发送数据 Magic packets 用于实现远程唤醒,当侦测到magic packet,主机会被唤醒 3.IP and higher layers frame format 举例来...
Destination MAC Address:This field specifies the MAC address of the intended recipient of the frame. It is 6 bytes long and uses the IEEE 802 MAC address format. Source MAC Address:Similar to the destination MAC address, this field specifies the MAC address of the sender of the frame. Ether...
novell-etherwhensettingupthe Ethernetinterface Two.Differentframeformats Thefollowingdescribeseachframeformat 1.EthernetII It'stheDIXEthernetconsortium...Itconsistsof6bytesof destinationMACaddress,6bytesourceMACaddress, The2bytetypedomain(usedtoindicatethetypeofdata encapsulatedintheFrame,thedatainside)isFrameHead...
基本帧(Base Frame)的结构如下图所示,各区域说明如下: (1)、帧前序(Preamble):这个区域是:“1”、“0”交替的56bit数据; (2)、帧起始符SOF(Start of Frame Delimiter):固定值为10101011的8bit数据,用于表示一帧的开始; (3)、MAC目的地址与源地址(Destination & Source MAC Address):前三个字节是IEEE分配...
Frame Format Preamble + SFD: 前导码 0x5555_5555_5555_55D5 Pad: 为了正确的CSMA/CD传输,以太网帧长度至少为64bytes,因此Data+Pad至少需要46bytes,而Pad的值将用于FCS校验,但是不属于数据长度值(Len)。 发送:这个值可由MAC自动插入或者用户提供,并且FCS的值也可以由MAC计算。
Preamble:It can inform the receiving system that a frame is beginning and enable synchronization. Start Frame Delimiter (SFD):It means that the destination MAC address field start with the next byte. The SFD is 1 byte in length. Destination MAC:This field is 6 bytes long. It includes the ...
Source MAC address. Six bytes for IPv4. This field identifies the sender of a frame. Type 2 bytes Protocol type. Table 1-3 lists the types of protocols that are directly encapsulated on a link. Data 46–1500 bytes Data field, which identifies the payload of a frame (which may con...
E-LMI messages are encapsulated in 46- to 1500-byte Ethernet frames, which are based on the IEEE 802.3 untagged MAC-frame format. E-LMI frames consist of the following fields: Destination address (6 bytes)—Uses a standard MAC address of 01:80:C2:00:00:07. ...
Establishes communication from station to station across a single link. This is the layer that transmits and receives frames, recognizes link addresses, etc. The part of the standard that describes theEthernet frame format and MAC protocol belongs to this layer. ...
layer, the functionality has been moved to a new upper sub layer protocol as defined in LLC (802.2). This is more of an effort to make the frame format comply with the 7 Layer OSI model (in which case the MAC/Ethernet fields are considered as if they are acting in the Physical Layer...