prevents a router from improperly reinstating a route from a regular routing update
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prevents information about a route from being sent in the direction from which the route was learned
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prevents invalid updates from looping the internetwork indefinitely
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causes a routing protocol to advertise an infinite metric for a failed route
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decreases convergence time by immediately sending route information in response to a topology change
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prevents, via the use of logical subdivisions, routing updates from propagating the internetwork
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holddown timer
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prevents a router from improperly reinstating a route from a regular routing update
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split horizon
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prevents information about a route from being sent in the direction from which the route was learned
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defining a maximum
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prevents invalid updates from looping the internetwork indefinitely
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route poisoning
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causes a routing protocol to advertise an infinite metric for a failed route
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triggered update
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decreases convergence time by immediately sending route information in response to a topology change
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