I'd have to revisit this, because it's been some time since I've done anything with it, but I recall something from the old QOS class about the max-reservable bandwidth is defaulted to 75% of the link bandwidth so that routing protocols and other traffic can have a little breathing room. Like I said, I'll have to revisit this, but I think this may be the case. I don't think routing protocol traffic actually uses the "priority" queue on Cisco routers, unless you classify the traffic and put it there.
Sorry if I'm off base here, just thinking out loud. Regards, Brandon Carroll - CCIE #23837 Senior 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 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 www.ipexpert.com/communities and our public website at www.ipexpert.com Platinum Solutions Group (PSG) provides high-end consulting services with a primary emphasis on Cisco's Data Center Solutions, Service Provider Solutions, Unified Communications and Security-enabled infrastructures. Be sure to visit www.platinumsolutionsgroup.com. On May 14, 2010, at 5:37 PM, Paul Stewart wrote: > I think this is not just an ASA thing. It seems that routing protocol > traffic is always handled by the priority queue on a router as well. > > > > On May 14, 2010, at 3:06 AM, Anantha Subramanian Natarajan > <[email protected] >> wrote: > >> Hi All, >> >> Was reading through Chapter 11(QOS) on the Cisco ASA:All-in-One >> Firewall,IPS,Anti-X, and VPN Adaptive security appliance" book and >> inferring >> the below sentence from that >> >> "Certain critical keep-alive packets such as EIGRP hello packets are >> never >> dropped even if they are not prioritized in the shaped traffic" >> >> Have a question on that, >> >> 1) Is all protocols hello packets treated that way in Cisco ASA and >> if so, >> how Cisco ASA keeps track of that to have this exception. >> >> Thanks for the help >> >> Regards >> Anantha Subramanian Natarajan >> > _______________________________________________ > For more information regarding industry leading CCIE Lab training, please > visit www.ipexpert.com _______________________________________________ For more information regarding industry leading CCIE Lab training, please visit www.ipexpert.com
