And more importantly, all of them from ramping back up at the same time which may in itself cause congestion again :)
On Fri, Sep 4, 2009 at 2:18 PM, Bodnar, Edward <[email protected]>wrote: > Ok now I get it. This prevents all TCP sessions for slowing. Just the > couple TCP sessions I drop packets on will slow. > > > > > > > > *From:* Bryan Bartik [mailto:[email protected]] > *Sent:* Friday, September 04, 2009 2:15 PM > *To:* Bodnar, Edward > *Cc:* [email protected] > *Subject:* Re: [OSL | CCIE_RS] RED > > > > Edward, > > RED stops the global synchronization problem. That is when all sessions > scale back and then speed up at once. RED will cause a few sessions to scale > back, allowing most other flows to continue at the same speed. Like all QoS > mechanisms, it's not going to resolve all bandwidth issues, but should be > able to alleviate some problems where large flows aree causing congestion. > WRED (weighted RED) uses the DSCP bits to differentiate further. > > -hth > > On Fri, Sep 4, 2009 at 12:03 PM, Bodnar, Edward <[email protected]> > wrote: > > I have a general question. If TCP packets are dropped causing a slow down > on a network ( Tail drop ) If I enable RED and it starts randomly dropping > packets before the congestion happens how does this help me. I keep reading > answers that say it drops the packet before the congestion starts but it’s > still dropping packets how does this help? > > > > Ed, > > > > > > > _______________________________________________ > For more information regarding industry leading CCIE Lab training, please > visit www.ipexpert.com > > > > > -- > Bryan Bartik > CCIE #23707 (R&S), CCNP > Sr. Support Engineer - IPexpert, Inc. > URL: http://www.IPexpert.com > > _______________________________________________ > For more information regarding industry leading CCIE Lab training, please > visit www.ipexpert.com > > -- Regards, Joe Astorino - CCIE #24347 R&S Technical Instructor - IPexpert, Inc. Cell: +1.586.212.6107 Fax: +1.810.454.0130 Mailto: [email protected]
_______________________________________________ For more information regarding industry leading CCIE Lab training, please visit www.ipexpert.com
