ethernet v2报文中:LG bit: Globally unique address (factory default)是什么
时间: 2024-02-09 21:07:13 浏览: 25
在Ethernet v2报文中,LG bit(Length/Type Good bit,长度/类型正确位)是由1个比特位组成的字段,用于指示数据包头部中类型字段的值是否正确。
“Globally unique address (factory default)”是指以太网设备的出厂默认地址。在以太网设备出厂时,会被分配一个全球唯一的MAC地址,也称为物理地址或硬件地址。该地址由IEEE管理,由三个字节的厂商代码和三个字节的设备代码组成。该地址是全球唯一的,因此称为“全局唯一地址”。
在以太网数据包中,目的MAC地址用于确定数据包的接收方。如果数据包的目的MAC地址是全局唯一地址,LG bit会被设置为1,表示类型字段的值正确,数据包的长度由长度字段指定。如果数据包的目的MAC地址是组播地址,LG bit会被设置为0,表示类型字段的值不正确,数据包的长度由帧尾中的数据指定。
总之,Ethernet v2报文中的LG bit是用于指示数据包头部中类型字段的值是否正确的比特位。当数据包的目的MAC地址是全局唯一地址时,LG bit会被设置为1,表示类型字段的值正确,数据包的长度由长度字段指定。
相关问题
ethernet 2中:LG bit: Globally unique address (factory default)是什么
在Ethernet II(Ethernet 2)中,LG bit(Length/Type Good bit,长度/类型正确位)是由1个比特位组成的字段,用于指示数据包头部中类型字段的值是否正确。LG bit的值取决于Ethernet II帧中类型字段的值。
“Globally unique address (factory default)”是指以太网设备的出厂默认地址。在以太网设备出厂时,会被分配一个全球唯一的MAC地址,也称为物理地址或硬件地址。该地址由IEEE管理,由三个字节的厂商代码和三个字节的设备代码组成。该地址是全球唯一的,因此称为“全局唯一地址”。
在Ethernet II数据包中,目的MAC地址用于确定数据包的接收方。如果数据包的目的MAC地址是全局唯一地址,LG bit会被设置为1,表示类型字段的值正确,数据包的长度由长度字段指定。如果数据包的目的MAC地址是组播地址,LG bit会被设置为0,表示类型字段的值不正确,数据包的长度由帧尾中的数据指定。
总之,在Ethernet II中,LG bit用于指示数据包头部中类型字段的值是否正确。当数据包的目的MAC地址是全局唯一地址时,LG bit会被设置为1,表示类型字段的值正确,数据包的长度由长度字段指定。
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