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EtherChannel between a switch and a server. EtherChannel is a port link aggregation technology or port-channel architecture used primarily on Cisco switches.It allows grouping of several physical Ethernet links to create one logical Ethernet link for the purpose of providing fault-tolerance and high-speed links between switches, routers and servers.
Layer 1 overhead Layer 2 overhead Layer 3 overhead Layer 4 overhead Payload size Total transmitted [B] Efficiency [C] Standard: 1500: preamble 8 byte: IPG 12 byte: frame header 14 byte: FCS 4 byte: IPv4 header 20 byte: TCP header 20 byte: 1460 byte: 1538 byte: 94.93% Jumbo: 9000: preamble 8 byte: IPG 12 byte: frame header 14 byte: FCS 4 byte ...
Aggregation at layer 3 (network layer) in the OSI model can use round-robin scheduling, hash values computed from fields in the packet header, or a combination of these two methods. Regardless of the layer on which aggregation occurs, it is possible to balance the network load across all links.
That value was chosen because the maximum length of the data field of an Ethernet 802.3 frame is 1500 bytes and 1536 is equivalent to the number 600 in the hexadecimal numeral system. Thus, values of 1500 and below for this field indicate that the field is used as the size of the payload of the Ethernet frame while values of 1536 and above ...
While STP can take 30 to 50 seconds to respond to a topology change, RSTP is typically able to respond to changes within 3 × hello times (default: 3 × 2 seconds) or within a few milliseconds of a physical link failure. The hello time is an important and configurable time interval that is used by RSTP for several purposes; its default value is ...
If it's less than or equal to 1500, it must be an IEEE 802.3 frame, with that field being a length field. Values between 1500 and 1536, exclusive, are undefined. [10] This convention allows software to determine whether a frame is an Ethernet II frame or an IEEE 802.3 frame, allowing the coexistence of both standards on the same physical medium.
IEEE 802.3 is a working group and a collection of standards defining the physical layer and data link layer's media access control (MAC) of wired Ethernet.The standards are produced by the working group of the Institute of Electrical and Electronics Engineers (IEEE).
[3] Plain EtherChannel load-balancing works by having the switch assign a hash result from 0-7 based on the configured hash method (load-balancing algorithm) for the type of traffic. This hash result is commonly called a Result Bundle Hash (RBH). [4] They are then divided out over the available links.