From: Michael Brooks (michaeljbrooks@gmail.com)
Date: Sun Sep 30 2007 - 23:03:10 ART
Thanks Ryan. I have seen that document as well, but I am suprised a
document is not published specifially stating that "RED will drop UDP
packets" especially when UDP is on every network.
Regards,
Mike Brooks
CCIE# 16027
On 9/30/07, Ryan Morris <ryan@egate.net> wrote:
>
> It drops packets based on queue depth. It doesn't care what kind of IP
> packet it is.
>
> Although it doesn't say it explicitly, the answer is here:
>
>
> http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122cgcr/fqos_c/fqcprt3/qcfconav.htm#wp1000893
>
> "In considering the usefulness of RED when robust transports such as TCP
> are pervasive, it is important to consider also the seriously negative
> implications of employing RED when a significant percentage of the traffic
> is not robust in response to packet loss. Neither Novell NetWare nor
> AppleTalk is appropriately robust in response to packet loss, therefore
> you should not use RED for them."
>
> UDP is a non-robust transport, and would not benefit (in fact could suffer
> greatly) from having a large number of random packets dropped.
>
> Regards,
>
> Ryan Morris
> CCIE #18953
>
> On Sun, 30 Sep 2007, Michael Brooks wrote:
>
> > All,
> >
> > I have a $1 dollar bet with one of my colleagues that RED or even WRED
> > (depending on how its configured) does drop UDP packets. He states that
> > since the congestion avoidance mechanisms of RED only works on TCP flows
> > that only TCP packets will be dropped "only". The problem is I have
> been
> > searching and can't find any good documentation to back up my
> theory. Also,
> > I haven't had time to test in the lab. Does anyone have some good
> > links proving one of our theories (preferably mine ;-) ). Your input
> would
> > be greatly appreciated.
> >
> > Thank you,
> > Mike
> >
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