Got it mate!! If we use this formula it sets the timer according to the diameter value.
*max age = (4 * hello) + (2 * diameter) – 2 f**orward delay = ((4 * hello) + (3 * diameter)) / 2* Basically what we know about max-age as 20 secs (21secs actual), is derived by keeping the diameter value of 7, similarly we get the forward delay of 15secs (14.5 secs actual) again based on the a diameter value of 7. * * Regards, *Syed * On Wed, Apr 14, 2010 at 5:30 PM, Joe Astorino <[email protected]>wrote: > That is a great question. There is a formula for it that I do not recall > but you should be able to find it. I will have a look as well when I have a > second and let you know. > > Please do let the group know your findings as well > > Sent from my Verizon Wireless BlackBerry > > > Regards, > > Joe Astorino - CCIE #24347 > 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 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 > > ------------------------------ > *From: * Syed Zaidi <[email protected]> > *Date: *Wed, 14 Apr 2010 17:21:52 +0300 > *To: *Joe Astorino<[email protected]> > *Cc: *R&S OSL<[email protected]> > *Subject: *Re: [OSL | CCIE_RS] Setting layer 2 network diameter.. > > Well said but how does it impact the timers, I mean based on what criteria? > > If I have five switches A,B,C, D & E, where A is the root and B & C are > connected directly to it, whereas D is connected to B and E is connected to > C, finally D & E has a connection between them. In such a scenario if we set > the diameter to 3, how will the timers be readjusted for optimization? > > Regards, > Syed > > On Wed, Apr 14, 2010 at 4:03 PM, Joe Astorino <[email protected]>wrote: > >> Basically this knowledge can help you in the CCIE lab if you are asked >> to do it : ) Other than that, in a lab as small as the CCIE lab this >> feature is probably not going to make or break your network. As far >> as if it is tested, it is part of spanning-tree so I would definitely >> consider it fair game. The important thing to be aware of is that it >> dynamically changes your STP timers as you quoted from the docCD. >> >> >> >> On Wed, Apr 14, 2010 at 8:58 AM, Syed Zaidi <[email protected]> wrote: >> > This is an extract from Cisco configuration guide for Catalyst 3560.. >> how >> > can setting L2 diameter help us in CCIE lab? Are the candidate tested on >> > this in relation to reducing convergence timers? >> > Use the diameter keyword to specify the Layer 2 network diameter (that >> is, >> > the maximum number of switch hops between any two end stations in the >> > Layer 2 network). When you specify the network diameter, the switch >> > automatically sets an optimal hello time, forward-delay time, and >> > maximum-age time for a network of that diameter, which can significantly >> > reduce the convergence time. You can use the hello keyword to override >> the >> > automatically calculated hello time. >> > Regards, >> > Syed >> >_______________________________________________ >> > For more information regarding industry leading CCIE Lab training, >> please >> > visit www.ipexpert.com >> > >> > >> >> >> >> -- >> Regards, >> >> >> >> Joe Astorino - CCIE #24347 >> 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 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 >> > >
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