Fast switching definitely has the problem you refer to. Fast switching
offers per-destination load-sharing. Since the router caches information on
how to forward traffic to a destination, all traffic to that destination
exits the same interface.
One of the goals of CEF was to overcome this problem. I can't remember the
details, but I think you can do more precise load-balancing with CEF. I'll
see if I can dig up more details and get back to you. Or maybe some other
folks who use CEF can chime in.
Priscilla
At 12:31 PM 12/13/00, Adam Hickey wrote:
>Hey all,
>
>Question:
>1) On a router with multiple outbound paths, if fast switching (or CEF) =
>is enabled and outbound traffic comes through towards a given =
>destination, is all traffic for that same destination then locked to the =
>same path untill the route cache is cleared?
>
>2) If the above is yes, how long does the router maintain its route =
>cache?
>
>Purpose:
>We have a 7507 that will be running BGP over 2 T1's. We are attempting =
>to establish load balancing both inbound and out. Halabi (2nd Ed.) in =
>Chapter 7 warns that to do this one must be familiar with the different =
>methods of switching. Thus I am studying to find the pro's and cons of =
>each. CEF or fast switching sounds about right, however, the above =
>question was raised as I was discussing this with our lead engineer.
>
>
>Thank You
>Adam
>[EMAIL PROTECTED]
>
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________________________
Priscilla Oppenheimer
http://www.priscilla.com
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