[c-nsp] Migration to Rapid-PVST

[Robert Hass]

Hi

I have question regarding migration from classic PVST to Rapid-PVST. My
Layer2 network diagram:

                  customers
                   |
                   |
                  2950G
                   |
                   ge
                   |
                  3560G--ge--3750G---ge---7304
                 /  |        |
                ge  |        |
               /    |        |
customers---3550    ge       ge
               \    |        |
                ge  |        |
                 \  |        |
                  2960G--ge--3560G---ge---7304
                  /   \
                 ge    ge
                /       \
   customers--2950G    2950G--customers
               
All above switches are working in same VTP domain, so they have same
VLANs database (currently about 60 VLANs). 3750G switch is root-bridge
for all VLANs, core-switches (2960G,2x3560G,3750G) carring VLANs from
access-switches (3550, 3x2950G) to edge routers (2x7304).

How procedure of migration to Rapid-PVST should looks ? Should I first
upgrade core switches and next access-switches ? Is this migration
bring some outages in network (eg. caused by spanning-tree
recalcuations).

Thanks for help,
Robert