Enable portfast on the host ports and you'll see a much quicker transition. Just labbed this up and with portfast enabled I lost a single ping during the failover. Without it enabled I lost 12.
For the VoIP question - in production I'd recommend building with Etherchannels just so STP never needs to converge. On Wed, Mar 9, 2011 at 5:41 PM, marc abel <[email protected]> wrote: > I have 4 switches connected in a loop. > > Cat1-------------Cat2 > | | > | | > Cat3----------Cat4 > > > Cat 1 is the root, Cat 2 is the secondary root. All the switches are > set to RPVSTP and I have confirmed that show spanning-tree shows RSTP > as the protocol. Cat 4 shows it's interface to cat3 as it's root port > and the interface to Cat3 as the Alternate. I have not tuned any > timers. > > What should be the convergence time in this situation? > > If I run a ping from a host attached to Cat4 to a host attached to > Cat1 and then I shut the Cat1-Cat3 interface (on the Cat1 side) it > takes about 32 seconds before pings pick back up. I thought RSTP was > supposed to converge in about 6 seconds? > > Another question, what is the fastest recovery time we can tune down > to from RSTP? How do others tune this for VOIP? I know that I can get > sub second convergence from OSPF but not all my switches have an > appropriate image to run ospf. > > > Thanks in advance. > > Marc > _______________________________________________ > 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
