So this brings me back to when to use CoS or when to use DSCP. Do I have to use both? Can I use one over the other and when would I use DSCP vs CoS.
From: prakash patel [mailto:[email protected]] Sent: Wednesday, August 19, 2009 2:38 PM To: Bodnar, Edward; [email protected] Subject: RE: [OSL | CCIE_RS] QOS question Everything is about changing the default. Yes in some cases , you do like to bypass the mapping of COS-DSCP..and trust DSCP. In some case you like to change the DSCP if device is marking with DSCP In some cases you changed it based on COS if device is not marking DSCP. ________________________________ From: [email protected] To: [email protected]; [email protected] Date: Wed, 19 Aug 2009 13:32:45 -0500 Subject: RE: [OSL | CCIE_RS] QOS question I would think you would still need to do a DSCP to CoS mapping then back to DSCP. I am looking at some configuration and then seem to just pass the DSCP mapping right through the switches. From: prakash patel [mailto:[email protected]] Sent: Wednesday, August 19, 2009 2:28 PM To: Bodnar, Edward; [email protected] Subject: RE: [OSL | CCIE_RS] QOS question FOr internal schduling /queing ________________________________ From: [email protected] To: [email protected]; [email protected] Date: Wed, 19 Aug 2009 13:15:57 -0500 Subject: RE: [OSL | CCIE_RS] QOS question So any time I pass from a layer 2 device to a layer 3 device I need to translate the CoS to DSCP. And any time I go from a layer 3 device to layer 2 device I need to translate DSCP to CoS? If this is true then why do that have DSCP to DSCP translations in switches ? From: prakash patel [mailto:[email protected]] Sent: Wednesday, August 19, 2009 2:09 PM To: Bodnar, Edward; [email protected] Subject: RE: [OSL | CCIE_RS] QOS question Layer 2 devices connection ...USE COS LAYER 3 devices use DSCP. ________________________________ From: [email protected] To: [email protected] Date: Wed, 19 Aug 2009 13:01:01 -0500 Subject: [OSL | CCIE_RS] QOS question When would I use CoS over DSCP or DSCP over CoS. ________________________________ With Windows Live, you can organize, edit, and share your photos. Click here.<http://www.windowslive.com/Desktop/PhotoGallery> ________________________________ Get back to school stuff for them and cashback for you. Try BingT now.<http://www.bing.com/cashback?form=MSHYCB&publ=WLHMTAG&crea=TEXT_MSHYCB_BackToSchool_Cashback_BTSCashback_1x1> ________________________________ Get back to school stuff for them and cashback for you. Try BingT now.<http://www.bing.com/cashback?form=MSHYCB&publ=WLHMTAG&crea=TEXT_MSHYCB_BackToSchool_Cashback_BTSCashback_1x1>
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