Option #1 assuming the question means it will wait 16 seconds AFTER max_age has already expired. After max_age expires it is 2x forward-delay.
Option #2 assuming the question means it will wait 16 seconds in total. I suppose it depends on how you interpret "...when a port fails". My best guess is option #1, but in the real lab if I got this,I would ask the proctor and give him the information you just gave me so he knows that you know what you are talking about. Also: Max-Age is still 20 seconds even with RSTP/MST (verify this by doing show span in either of those modes). There is a subtle difference. RSTP/MST can detect a failure in 6 seconds (3x hello-time of 2 seconds) but that is a different function than the max age. The hello BPDUs in RSTP/MST work differently than in traditional STP and PVSTP+ because in RSTP/MST the hellos are used between routers on each segment as sort of a "keepalive." On Wed, Jul 22, 2009 at 9:08 PM, M Jay <[email protected]> wrote: > Hi > I need help in this question: > > SW1 connected with SW2 through trunk ports, when a port fails the other > port will wait for 16 second before the interface begins forwarding. > > Possible soltuions: > > SW1 > spanning-tree VLANx forward-time 8 > > Or > > Spannin-tree VLANx forward-time 5 > spanning-tree VLANx max-age 6 > > As forward-time includes listening and learning phases (5+5= 10) do I need > to include the max-age time of 6 seconds ? Does max-age time effects in > forwarding state of interface ?? > > Please assist!!!! > > Thanks > > > > > > ------------------------------ > Windows Live™ SkyDrive™: Store, access, and share your photos. See > how.<http://windowslive.com/Online/SkyDrive?ocid=TXT_TAGLM_WL_CS_SD_photos_072009> > > _______________________________________________ > For more information regarding industry leading CCIE Lab training, please > visit www.ipexpert.com > > -- Regards, Joe Astorino - CCIE #24347 R&S Technical Instructor - IPexpert, Inc. Cell: +1.586.212.6107 Fax: +1.810.454.0130 Mailto: [email protected]
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