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A switching loop or bridge loop occurs in computer networks when there is more than one layer 2 path between two endpoints (e.g. multiple connections between two network switches or two ports on the same switch connected to each other). The loop creates broadcast storms as broadcasts and multicasts are forwarded by switches out every port, the ...
In the C programming language, Duff's device is a way of manually implementing loop unrolling by interleaving two syntactic constructs of C: the do-while loop and a switch statement. Its discovery is credited to Tom Duff in November 1983, when Duff was working for Lucasfilm and used it to speed up a real-time animation program.
A loop-switch sequence [1] (also known as the for-case paradigm [2] or Anti-Duff's Device) is a programming antipattern where a clear set of steps is implemented as a switch-within-a-loop. The loop-switch sequence is a specific derivative of spaghetti code. It is not necessarily an antipattern to use a switch statement within a loop—it is ...
Most commonly the cause is a switching loop in the Ethernet network topology (i.e. two or more paths exist between switches). A simple example is both ends of a single Ethernet patch cable connected to a switch.
In a simple reachability protocol, such as EGP, the routing loop will persist forever. In a naive distance-vector protocol, such as the routing information protocol, the loop will persist until the metrics for C reach infinity (the maximum number of routers that a packet can traverse in RIP is 15. The value 16 is considered infinity and the ...
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Nx_Port communicating through a PN_Port that is not operating a Loop Port State Machine. [13] F_Port (Fabric port) An F_Port is a switch port that is connected to an N_Port. [14] E_Port (Expansion port) Switch port that attaches to another E_Port to create an Inter-Switch Link. [14] Fibre Channel Loop protocols create multiple types of Loop Ports:
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