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There are 3 different Ethernet Header types defined by the IEEE and in use today. So, one question comes to mind: When a Ethernet receiver receives a frame, how does it know what kind of header it is? After all, if a receiver is unable to properly recognize the header type, it will [...]

RFC 2597 defines a group of DSCP settings called “Assured Forwarding” Per Hop Behavior (PHB) to be recognized by RFC compliant DSCP routers and switches called DS nodes. The Assured Forwarding PHB class is presented as AF(xy), where x=traffic class, and y=drop precedence. 4 traffic classes, and 3 drop precedences are defined. For example, AF21 [...]

Tags: dscp, QoS

Route summarization can be a good thing when done correctly. By summarizing a group of specific routes into one larger summarized (aggregate) route you can greatly improve the stability of the internetwork routing protocol. When a router advertises a summary it hides link failures and instabilities behind the summary from being seen by the rest [...]