The best replacement for rstp is stp.

The best alternatives to rstp are rated as following:
★★★★★  stp
★★★★★  mstp
★★★★  pvst
★★★  rapid-pvst+
★★★  portfast
★★  mst
★  rep
★  erps
  g.8032

Your alternative for rstp is not listed? Suggest!
Speaking about rstp, one probably shouldn't forget about stp.

Other search terms related to rstp and their ratings are:
★★★★★ stp
★★★★ mstp
★★★ portfast
You have in mind a companion for rstp and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of rstp in all years. Click on graph for more.
rstp
stp
mstp