CCNA - holddown timer

Author

holddown timer

nhat777

2002-06-24, 3:33 pm

I saw this question but not sure the answer:

Why are hold-down timers useful?
A. They help prevent a router from immediately using an alternate route that includes the failed route
B. They force all routers in a segment to synchronize switching operations
C. They reduce the amount of network traffic during high traffic periods
D. They provide a mechanism for bypassing failed sections of the network

B?

cahillrobert

2002-06-24, 4:53 pm

Most routing protocols have timers that prevent topological loops from forming during periods of link transition. For example, when a route is suspect, the router put the route into a hold-down and no new routing information about that route will be accepted until the hold-down timer expires.

This approach gives the network topology an opportunity to stabilize before new route
calculations are performed.

The concept of a hold-down timer is primarily associated with distance vector routing protocols. The default hold-down timer is three times the update timer period plus 10 seconds.

nyriavo

2002-06-24, 11:41 pm

"A"

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