>An article said the routing table is located in RAM.
Correct.
>I got a little puzzled ,cause if the router is powered off by accident,
>will the table get lost totally?
Yes, with the caveat that static routes are an _input_ to the routing table.
>If the router is a backbone one,the table should be very big ,so after
>the power cycle ,the router has to attain all the routes once again,it's
>time consuming.
Yes. In a default-free Internet router with a full routing table,
you'll see times of several minutes based on the number of views and
the complexity of filters. On the other hand, a serious Internet
backbone provider will have more than one router.
In an enterprise environment without extensive Internet routing, the
initial convergence time may still be noticeable, but could be in the
tens of seconds or low minutes.
>Does the router put some static routes in NVRAM or flash ,
Yes. NVRAM.
>or all the
>routes stay in ram ?
If you know the routes are stable, then you certainly can use static
routes. If you aren't sure about them, however, how do you know the
routes you've kept are still valid?
>
>Thanks.
>
>frank
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