A routing loop is a situation that occurs between two or more routers in which a packet is continuously routed between the routers as a result of irregularities from the routing algorithms and/or the routing tables of the routers. (routing loops, 2015). An example is when three routers are connected in a triangular pattern i.e. router A is connected to router B, router B is connected to router C and router C is connected to router A, when the network is converged, all three routers will have sent their routing tables to their neighbors. If router C goes down and router B tries to send a packet to C at the same time the router went down before it receives an updated table from router A, it will look into its routing table and it sees that router A can get to C, so it will update its route to C through A and will send the packet through router A. the same thing happens when router A receives the packet from router B, since it received no update on a change from B, it also checks its table and sees that B can get to C, so it updates its route to C through B and sends the packet to B and the packet keeps getting sent this way until the maximum hop count is reached
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These loops are as the name implies usually temporary and need no human intervention. They tend to resolve themselves as the devices
These loops are as the name implies usually temporary and need no human intervention. They tend to resolve themselves as the devices