There is no learning state in RSTP. The switches negotiate where the root is in the topology and set Root/Designated ports appropriately.
The hello timer controls how often BPDU's are sent and the dead timer controls how long you will wait before considering that neighbor dead. On Thu, Nov 18, 2010 at 10:54 AM, Taqdir Singh <[email protected]>wrote: > *Could you please explain,. how long RSTP waits in learning stage ? and > when timers come into play ? > * > > On Thu, Nov 18, 2010 at 9:08 PM, Jay Taylor <[email protected]> wrote: > >> It's done through Proposal and Agreement messages - >> http://www.cisco.com/en/US/docs/switches/lan/catalyst3560/software/release/12.2_52_se/configuration/guide/swmstp.html#wp1073033 >> >> >> >> >> On Thu, Nov 18, 2010 at 10:24 AM, Taqdir Singh <[email protected]>wrote: >> >>> *Hello Jay* >>> ** >>> *Could you please explain a little bit more on negotiations in RSTP ?* >>> >>> ** >>> *if it is negotiation based, why there are timers ? when they are used ? >>> * >>> >>> >>> On Thu, Nov 18, 2010 at 8:49 PM, Jay Taylor <[email protected]> wrote: >>> >>>> There is no forward delay timer in RSTP. Convergence is based on >>>> negotiation rather than waiting for timers to expire. >>>> >>>> >>>> >>>> On Thu, Nov 18, 2010 at 10:15 AM, Ryan Jensen <[email protected]> wrote: >>>> >>>>> I'm pretty sure the forward-delay timer is still 15 seconds. >>>>> >>>>> On Thu, Nov 18, 2010 at 10:03 AM, Taqdir Singh < >>>>> [email protected]> wrote: >>>>> >>>>>> *Hi all,* >>>>>> * >>>>>> *What is the default convergence times when using RSTP? Unlike STP >>>>>> I understand that RSTP has three timing intervals before it begins to >>>>>> converge. >>>>>> >>>>>> RSTP >>>>>> Hello timer >>> 2 seconds >>>>>> MAX-AGE >>> 6 seconds >>>>>> Forward-Delay (Learning) >>> ? seconds >>>>>> >>>>>> Default convergence time ? >>>>>> >>>>>> >>>>>> STP >>>>>> Hello timer >>> 2 seconds >>>>>> MAX-AGE >>> 20 seconds >>>>>> Forward-Delay (Listening) >>> 15 seconds >>>>>> Forward-Delay (Learning) >>> 15 seconds >>>>>> >>>>>> Default convergence time 50 seconds >>>>>> >>>>>> >>>>>> If I am understanding things correctly >>>>>> >>>>>> 1.The Hello interval are the same as STP which is every 2 seconds. >>>>>> >>>>>> 2. The default Max-Age time for RSTP is 3 times the hello interval or >>>>>> 6 seconds. >>>>>> >>>>>> 3.RSTP elminates the listening state however, there is a learning >>>>>> state. >>>>>> >>>>>> What is the default time that RSTP stays in the learning state before >>>>>> is transitions to either forwarding or discarding? >>>>>> >>>>>> >>>>>> _______________________________________________ >>>>>> 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 >>>>> >>>>> >>>> >>> >>> >>> -- >>> Thanks & regards, >>> >>> Taqdir Singh >>> Networks | 9911709496 >>> >>> >> > > > -- > Thanks & regards, > > Taqdir Singh > Networks | 9911709496 > >
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