Hello everyone,
I'm actually struggling with the configuration of a couple of switches we bought earlier this year.
For now, this is a depictation of our network. You can see it's composed of different mixed switches (3COM and HP for the main part). You can also see, the red dotted links between switches are fiber connexions. those connexions are set up using SFP or SFP+ connectors. The fiber connexion between 3COM and HP 1920 is a link set up in early 2000, and the other one, is set up in october last year (a 10gbps uplink is available and tested).
In order to improve the interconnexion between our two buildings, I would like to use the newer fiber (set up between the two 1950 switches). The switches are actually configured as depicted up there, but, when I put the fiber link up between 1950's, the network crashes (I suppose due to a loop).
I suppose I've got to setup something like STP (Spanning Tree Protocol) but, the options are so ambiguous that I got no clue on what to configure, where, or even how. The only STP options / modes available on the 3COM switch are STP and RSTP. And the only thing I find on the 1920 swtich is something called "Loop Protection"
Some ports are excluded in the older switch config, but no clue on how to exclude a port from VLAN1 on the 1950 series.
Just a little more infos. The top left switchs (1950), is a 3 switches stack (IRF mode).
So, can someone tell me, how I can setup a "redundant" fiber connexion, making the newer one the "main" connexion ? How I can configure STP to work properly ?
In advance, I want to thank all the people who are going to help me find a solution to this issue.
Greatings from Belgium.
