I have changed my STP timers on the root bridge, either manually or using 'spanning-tree vlan xxx root primary diameter 2' commands.
From my non-root switch I can see that the timers have been adjusted under the 'ROOT ID' section of 'sh spanning-tree'. However, under the 'BRIDGE ID' section of 'sh spanning-tree' the timers are still set to 2, 15, 15 respectfully.
Can I conclude that in the case of STP convergence that the network will converge with the new timers that I configured for the whole layer 2 network ? and that the timers under 'BRIDGE ID' will be ignored ?
While your current root bridge is still the root, the timers will be as you configured them. If the root bridge disappears, then a new Spanning tree will be formed using the timers according to the new root bridge. It is always the current root bridge that sets the pace.
BTW, diameter 2 seems a bit small - is your network really that simple? If the worst case of link failure occured, (notwithstanding a change of root bridge), would the diameter still be only 2? If not, then a link failure might make the Spanning tree fail.
OTOH, if it is fast convergence you are after, you would be better off converting to rapid-pvst.
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