Welche Informationen enthält ein Ethernet Rahmen?
Diese Datensätze bestehen aus Binärcode, der wichtige Informationen liefert, darunter Adressen, Steuerinformationen, Nutzdaten und Prüfsummen. Je nach Ethernet-Standard sind Ethernet-Frames unterschiedlich aufgebaut und enthalten u. U. mehr oder weniger Datenfelder, abhängig vom Netzwerkprotokoll.
Wie groß ist der Ethernet Header?
1518 Byte
Standardmäßig ist der Ethernet-Datenframe maximal 1518 Byte groß, von denen 18 Byte für den Header und Trailer reserviert sind. Bei Verwendung von IEEE 802.1Q-Tags (für VLAN oder Priorisierung) wird der Header um vier Byte erweitert und das Frame damit maximal 1522 Byte groß.
What does the header of an Ethernet frame contain?
Each Ethernet frame starts with an Ethernet header, which contains destination and source MAC addresses as its first two fields. The middle section of the frame is payload data including any headers for other protocols (for example, Internet Protocol) carried in the frame. The frame ends with a frame check sequence (FCS),
Which is the optional format in Ethernet header?
Though several optional formats are being used to extend the protocol’s basic capability. Ethernet frame starts with Preamble and SFD, both works at the physical layer. Ethernet header contains both Source and Destination MAC address, after which the payload of the frame is present. The last field is CRC which is used to detect the error.
How is the Ethernet header similar to the LRH?
The Ethernet header provides similar functionality to the IB LRH. It allows Ethernet nodes to communicate with each other in a given subnet. So the RoCE packet does not include the LRH in the tunneled Ethernet packet. LRH fields are mapped into equivalent Ethernet header fields.
How does the Ethernet header work in RoCE?
RoCE tunnels most of the IB packet into an Ethernet packet [13]. The Ethernet header provides similar functionality to the IB LRH. It allows Ethernet nodes to communicate with each other in a given subnet. So the RoCE packet does not include the LRH in the tunneled Ethernet packet.