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CCNA Notes : cont...

52. The metric limit for link-state protocols is 65,533

53. Following are the possible solutions for preventing routing loops.

1.      Split Horizon - based on the principle that it is not useful to send the information about a route back in the direction from which the information originally came.

2.      Poison Reverse - A router that discovers an inaccessible route sets a table entry consistent state (infinite metric) while the network converges.

3.      Hold-down Timers - Hold down timers prevent regular update messages from  reinstating a route that has gone bad. Here, if a route fails, the router waits a certain amount of time before accepting any other routing information about that route.

4.      Triggered Updates - Normally, new routing tables are sent to neighboring routers at regular intervals (IP RIP every 30 sec / and IPX RIP every 60 sec). A triggered update is an update sent immediately in response to some change in the routing table. Triggered updates along with Hold-down timers can be used effectively to counter routing loops.

 


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