in my home lab environment I have 2 2924XL switchs, 1 2950, 1 2960 and 1 3550.
They are all connected to each other via redundant links.
All links are 100Mb
All the switches use the same priority.
I documented all the MAC addresses of each switch using "sh ver"
I then using my limited knowledge of STP presumed to know which ports were blocking, forwarding and root and documented this.
Bearing in mind the above setup...
I know that the root bridge is the lowest BID
I know that the root ports are closest to the root bridge,
I know that the Designated ports are chosen on the switch with lowest BID
Blocked ports are chosen on the switch with the highest BID.
Now when I verify this I conclude that a 2924 which has the highest BID of all my switches will have some blocked ports (depending on how they link together). What I find however is that the switches connected to this 2924 which have lower BID have blocked their ports, and the 2924 has all forwarding.
The 2924 is not the root bridge.
I cannot find why this is happening, is this possibly a bug with older switches? Do you need more info?
the 2924 is not the root bridge, there is another switch with a lower BID (in fact it's a 2924, BID 32768 00:01:24:e3:50:a3) which is the root. Doing a "sh spanning-tree" shows that the 2924 (not the root one, but the one that has it's ports forwarding) has the "root" switch as 00:01:24:e3:50:a3 which is correctt, it does not state "this is the root"
None of the switches have the priority set manually, they are all default of 32768.
We have 3 identical switches configured by someone else and would like to claim some of the Gigabit ports(G1/G2/G3/G4) for use on servers. When we try to change the wiring and configuration, we run in to connectivity issues. Attached is a des...
This is actually a pretty cool feature, i didn't even know it existed until I was looking for a solution to advertise a subnet (prefix in BGP talk), only if a certain condition existed. This is exactly what conditional advertisements does
j ai une question j ai achete un routeur cisco 887VA-k9 , je le configuré avec la configuration ci- dessous
si je le lier avec mon pc portable sur l un de ses ports directement ça marche toute est bien ( la connexion internet + m...