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
