If you configure the global command "mls qos" then the switch will begin to remark all traffic to precedence 0 by default unless you trust the port. "mls qos" is disabled by default.
So if it was enabled globally then you would need the command below to trust incoming precedence values. Regards, Tyson Scott - CCIE #13513 R&S, Security, and SP Managing Partner / Sr. Instructor - IPexpert, Inc. Mailto: <mailto:[email protected]> [email protected] Telephone: +1.810.326.1444, ext. 208 Live Assistance, Please visit: <http://www.ipexpert.com/chat> www.ipexpert.com/chat eFax: +1.810.454.0130 IPexpert is a premier provider of Self-Study Workbooks, Video on Demand, Audio Tools, Online Hardware Rental and Classroom Training for the Cisco CCIE (R&S, Voice, Security & Service Provider) certification(s) with training locations throughout the United States, Europe, South Asia and Australia. Be sure to visit our online communities at <http://www.ipexpert.com/communities> www.ipexpert.com/communities and our public website at <http://www.ipexpert.com/> www.ipexpert.com From: [email protected] [mailto:[email protected]] On Behalf Of Jim Terry Sent: Tuesday, June 21, 2011 4:43 PM To: Mark Senteza Cc: [email protected] Subject: Re: [OSL | CCIE_Security] Understanding "mls qos trust" command Hi Mark, here is my .02- yes unless specified- all switch ports remark traffic to BE. Routers trust everything. JT On Tue, Jun 21, 2011 at 1:29 PM, Mark Senteza <[email protected]> wrote: Hi, When asked to configure outbound traffic, say telnet, on a certain router interface with an IP Precedence value of 3, I've seen the following configuration on the connecting switch port, which I dont understand. interface FastEthernet0/6 desc Connection to Router R1 interface fa0/0 mls qos trust ip-precedence What's the purpose of the above "mls qos trust ip-precedence" command on the switch's port, and if not set, would the switch change the precedence value that had been set by the router configuration ? Mark _______________________________________________ For more information regarding industry leading CCIE Lab training, please visit www.ipexpert.com <http://www.ipexpert.com/> Are you a CCNP or CCIE and looking for a job? Check out www.PlatinumPlacement.com <http://www.platinumplacement.com/>
_______________________________________________ For more information regarding industry leading CCIE Lab training, please visit www.ipexpert.com Are you a CCNP or CCIE and looking for a job? Check out www.PlatinumPlacement.com
