Interesting question.
Yes the routing table is dynamically built by routing protocols.
There are also static routing entries if you created in your
configuration file. Locally connected active networks will be
entered into the routing table immediately after the reset.
If the question goes to how the router performs routing using
routing table, its different.
In the Cisco Express Forward mode, routing table is consulted
for the first packet of a given destination. IOS will store the
forward(port) information in the module/adaptor card RAM.
Subsequent packets target to the same destionation will
be forwarded to egress port without going through the routing
table.
Jim Xie
At 08:13 AM 08/14/2000 -0700, Roger Dellaca wrote:
>RAM is correct, because the routing table needs to be rebuilt if the router
>is powered of & on (from connected interfaces, static routes, & learned
>routes from whatever routing protocol(s)you're running).
>
>>>> "Frank Jordan" <[EMAIL PROTECTED]> 08/14/00 07:06AM >>>
>An article said the routing table is located in RAM.
>I got a little puzzled ,cause if the router is powered off by accident,
>will the table get lost totally?
>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.
>Does the router put some static routes in NVRAM or flash ,or all the
>routes stay in ram ?
>
>Thanks.
>
>frank
>
>
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