Hi Derek, Typically, you can use either method, but it depends on what you want to accomplish as well. One difference is indeed the direction of traffic. With NBAR (match protocol) the match statement will actually match traffic for that protocol in either direction. With an ACL you have to write multiple lines to match things in both directions.
In this particular task, we are asking for things to be queued going specifically to VLAN 12. With NBAR you would not be able to match the traffic going specifically to that subnet. With the ACL you can. The ACL is probably the better choice here. On Tue, Feb 2, 2010 at 2:05 PM, Mills, Derek <[email protected]> wrote: > I am noticing in the Workbook 1 QoS labs sometimes access-lists are used to > match protocol traffic and sometimes NBAR is used. > > Besides NBAR not working on a switch, what discerns between when to use > access-lists and when to use NBAR? At first I thought maybe direction of > traffic, but then since you specify input and output with the service-policy > I figured that can't be it. > > Specifically, I am looking at Lab22, Task 22.4. > > Why couldn't you use NBAR to define the class-maps instead of creating > access-lists? > > Thanks > > Derek > > > ________________________________ > Anheuser-Busch InBev Email Disclaimer www.ab-inbev.com > _______________________________________________ > For more information regarding industry leading CCIE Lab training, please > visit www.ipexpert.com > > -- Regards, Joe Astorino CCIE #24347 (R&S) Sr. Technical Instructor - IPexpert Mailto: [email protected] Telephone: +1.810.326.1444 Live Assistance, Please visit: www.ipexpert.com/chat eFax: +1.810.454.0130 IPexpert is a premier provider of Classroom and Self-Study Cisco CCNA (R&S, Voice & Security), CCNP, CCVP, CCSP and CCIE (R&S, Voice, Security & Service Provider) Certification Training with locations throughout the United States, Europe and Australia. Be sure to check out our online communities at www.ipexpert.com/communities and our public website at www.ipexpert.com _______________________________________________ For more information regarding industry leading CCIE Lab training, please visit www.ipexpert.com
