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Migrating From Ethernet To Fast Ethernet

Posted in Fast Ethernet


Here we are going to analyse the following aspects of upgrading/migrating from 10Mbit Ethernet to 100Mbit Ethernet.

  • Cabling
  • Incompatible Implementations
  • Repeaters In Fast Ethernet
  • Replacement Of Illegal Byte
  • Codes Data Translation
  • Error Handling And Partitioning

Integrating Fast Ethernet into 10MB Ethernet Networks

Posted in Fast Ethernet


Now that Fast Ethernet is here, the question becomes, "How do I start using it ?" Integrating Fast Ethernet into existing networks need not be done all at once.

Here are some aspects of 100Mbps implementation that should be considered:

  • Implementing Switching
  • Eliminating Bottlenecks
  • Expand The Topology Outwards and Downwards

The Novell Proprietary Frame Format

Posted in Ethernet Frame Formats


Novell's Proprietary Frame Format was developed based on a preliminary release of the 802.3 specification. After Novell released its proprietary format, the LLC Header was added, making Novell's format incompatible.

Below is a 3D diagram of the frame, let's have a look at it and try to analyse it:


Novell Ethernet 802.3 (RAW) Frame Format

The IEEE 802.3 SNAP Frame Format

Posted in Ethernet Frame Formats


While the original 802.3 specification worked well, the IEEE realized that some upper layer protocols required an Ethertype to work properly. For example, TCP/IP uses the Ethertype to differentiate between ARP packets and normal IP data frames. In order to provide this backwards compatibility with the Version II frame type, the 802.3 SNAP (SubNetwork Access Protocol) format was created.

The SNAP Frame Format consists of a normal 802.3 Data Link Header followed by a normal 802.2 LLC Header and then a 5-byte SNAP field, followed by the normal user data and FCS.

You can see the above mentioned headers in the 3D diagram of the frame below:


Ethernet 802.3 SNAP Frame Format - Analysis


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