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Explain the techniques to avoid Routing Loop issue in RIP- Hold-down timer: Prevention of sending inaccurate routing updates by routers is done by Hold-down timer. It is a common phenomenon in network environment for a router to down for different reasons like loss of power, a loose cable. Other routers are triggered by other routers for updating their routing tables, when a router goes down.
- Split-Horizon: The incorrect routing information and excessive routing can be reduced with the help of Split Horizon method. The premise of not sending information back the same way that it came is used by this rule. For example, a router receives an update from network A through interface B, the route updation to network A thorough interface B by the router will not take place with split-horizon rule.
- Trigger Updates: The routing changes are updated by the routers to their neighbors immediately by trigger updates, so that the routers need not wait for the regular timed updates. Certain protocols like EIGRP use only triggered updates for letting the network to know of a change.
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