Spanning-tree, Cisco 2950 vs 2924/3548 vs HP 2824


I have "inherited" a net (currently running 49 vlans) which has a mix of ~110 relatively new Cisco 2950C/2950T/2950G switches plus older Cisco 2924XL/3548XL and also one new HP ProCurve 2824. The majority of all vlans extends across all switches. All trunks are

802.1Q and all switches currently only have one uplink port. Spanning-tree is running on all (but I can't say I'm sure it works as it should) therefor the following questions (you'll have to excuse a newbie in this area).

Approx. layout:

2824 2950G 3548XL 2950C 2950C 2924XL ... | 2950 2924XL 2924XL 2950T ... | 2924XL 2924XL ...

hp2824-1# sh span Regular Spanning Tree Information STP Enabled : Yes

c2924-1#sh span Spanning tree 1 is executing the IEEE compatible Spanning Tree protocol

c2950g-48-1#sh spanning-tree summary Switch is in pvst mode

#1. Will current spanning-tree really work throughout the net if all switches has STP enabled (as shown above) while the Cisco 2950 models with enhanced image are running in pvst mode ? As I understand it all but those are running one spanning-tree per switch while those with enhanced are running one per vlan...

#2. Is it possible in this setup, and will I gain something, having the HP switch plus all Cisco switches with enhanced image run RSTP/RPVST instead ? Will spanning-tree still work across all switches ?

Comments anyone ?

// Oxy

P.S I know the current layout isn't the best but its what I have to live with for now. I cannot afford replacing all old switches with newer models...

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IMHO your time would be best spent eliminating spanning-tree or miniming its reach, not changing its form.

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