Yes, almost always is enough but what if you want to apply some QoS treatment to a subset of the traffic belonging to a specific marking? For instance you can have many incoming interfaces having the same mark, but you may want to apply unique treatment for traffic coming from a specifc interface. You may say, I'd change marking for that interface, but that would change behavior of the other routers on the path. Good thing about QoS group is that is valid only for the router that set it, Rgds
2008/6/24, ahmed mahmoud <[EMAIL PROTECTED]>: > Good day All. > > I have something to add here.. I understand the usage of the qos-groups but > i don't understand why we need them?!! aren't the marking enough for > traffic categorization ? like DSCP , IP-precedence or the mpls exp bits !!! > . > > Ahmed > > On Tue, Jun 24, 2008 at 12:19 PM, JH Cockburn <[EMAIL PROTECTED]> wrote: > >> Hi M, >> >> >> >> Using qos-groups is not limited to PE routers only. In fact you may use it >> anywhere where you think it can make life easier… >> >> >> >> >> >> So the idea is that you can match certain packets and mark them in a >> certain qos-group and then later/elsewhere do stuff with the qos-group… >> >> >> >> For example match packets with a certain MPLS EXP COS value (on P router) >> and set them to a qos-group and later maybe shape or apply WRED based on >> the >> qos-group on another interface… >> >> >> >> >> http://www.cisco.com/en/US/docs/ios/12_2t/12_2t13/feature/guide/ftenpkmk.html#wp1090481 >> >> >> >> >> >> May also be used in IPSEC Configs: >> >> >> http://www.cisco.com/en/US/docs/ios/12_3t/12_3t8/feature/guide/gtqosips.html >> >> >> >> Hope this helps…. >> >> >> >> >> ------------------------------ >> >> *From:* [EMAIL PROTECTED] [mailto: >> [EMAIL PROTECTED] *On Behalf Of *mohamed hamed >> *Sent:* Monday, June 23, 2008 10:36 PM >> *To:* OSL CCIE Service Provider Lab Exam >> *Subject:* [OSL | CCIE_SP] QoS group >> >> >> >> Hi everyone, >> >> >> >> Does anyone know where we should use the QoS group on P or PE Router? >> >> >> >> As I understand that we usually use it on PE router, but I found some Labs >> on the internetwork expert use it on P router as well >> >> >> >> If anyone knows why we should use QoS grouo on P routers , please unicast >> me a mail back >> >> >> >> *Mohamed Hamed* >> >> *Network Consulting Engineer*** >> >> *Mobile** (KSA-Riyadh): +966543464502* >> >> >> >> >> >> >> >> ------------------------------ >> >> Introducing Live Search cashback . It's search that pays you back! Try it >> Now<http://search.live.com/cashback/?&pkw=form=MIJAAF/publ=HMTGL/crea=introsrchcashback> >> >
