Although this question might be very "stupid" to some, i would
really appreciate if someone can give a real "technical" answer to the
following.
During our VOIP testing, our core engineers stated that all our
interfaces should have fair-queueing enabled, hence they can selectively
queue certain packets with amended TOS fields. I completely understand
that situation for WAN links, where congestion is a real concern.
Take for example you have a OC-12 link. Moreover suppose you never
max this connection out, infact, suppose you stay well under its
theoretical limit.
My question comes with the above assumptions in place. Why do you need
to enable fair-queueing, or any queuing on a link which will never get
exceeded ?
The core engineers stated that , although the interface doesn't get
congested, the router cannot simply process the packets quick enough to
have an empty output buffer. Therefore, they will always be an output
buffer which will need to get queued. That's when fair-queueing comes
into play.
Is this true?, will queuing be used on links that never get
congested. Laura Chappels ACRC book states that, if no congestion is
present, there is no need for queuing.
Moreover is ethernet, fiber links using a serial method for
transfer. That is, do bits travel one after another ? or in parallel?
I would greatly appreciate anyone's feedback to my questions,
thanks..
___________________________________
FAQ, list archives, and subscription info: http://www.groupstudy.com
Posting Guidelines: http://www.groupstudy.com/list/guide.html
