Mark, Command "priority" configures LLQ (Low Latency Queueing), which guarantees bandwidth, but also the latency. Packets in this queue will be scheduled for delivery before all other packets in other queues. This queue is "conditionally policed" at the rate specified, i.e. if there are packets in other queues, this queue cannot exceed the specified rate.
Command "bandwidth" configures Class Based Weighted Fair Queueing (CBWFQ) or Hierarchical Queueing Framework (HQF - on 12.4(20)T and above), which reserves minimum bandwidth for the class, but it does not guarantee latency. I.e. CBWFQ/HQF queues are processed after LLQ and in a round-robin fashion (a variation of deficit round robin - DRR). For your task, better solution is "bandwidth percent 25", since you were not asked anything about the latency. Also, don't forget that EIGRP has a built-in throttling mechanism and it will not use more than 50% of the available interface bandwidth (as specified by the "bandwidth" command on the interface). Alternate solution for the task is simply this: ! ! X = EIGRP AS ! interface FastEthernet0/0 ip bandwidth-percent eigrp X 25 ! -- Marko Milivojevic - CCIE #18427 Senior Technical Instructor - IPexpert FREE CCIE training: http://bit.ly/vLecture Mailto: [email protected] Telephone: +1.810.326.1444 Web: http://www.ipexpert.com/ On Fri, Aug 19, 2011 at 18:16, Mark Senteza <[email protected]> wrote: > > Hey all, > > I have a question about the correct options to select when asked to > "guarantee egress EIGRP traffic 25% of the bandwidth on an interface" > > Under the policy-map > class configuration I see two options, which seem to > describe doing the same thing. What is the difference between using > "priority percent" and "bandwidth percent" > > policy-map QOS-POLICY > class EIGRP > priority percent 15 > > where keyword "percent" -> % of total bandwidth > > or > > policey-map QOS-POLICY > class EIGRP > bandwidth percent 15 > > where keywords "bandwidth percent" -> % of total bandwidth > > Thanks, > > Mark > > _______________________________________________ > 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 > _______________________________________________ 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
