Spanning tree convergence

Daniels networking blog

Someone asked the other day how fast STP converges depending on PVST+ or
RPVST+ or MST is running. Usually the answer for PVST+ is 30-50 seconds
and for RPVST+ it’s fast, maybe less than a second. I thought I would
explore on this and check difference between PVST+ and RPVST+ and also
using PVST+ with features like uplinkfast.

This post assumes you already have a good basic understanding of STP. This
is not an introductory post on STP.

This is the topology being used:


SW1 is the root and ports towards the routers have been configured with VLAN 23
and portfast. I will run NTP to have the clocks properly synchronized. Currently
the port roles look like this:


I will configure the routers in subnet and do a ping to verify connectivity.

 R2#ping Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to, timeout is 2…

View original post 1,026 more words


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