I once read the limitation of the maximum switches that can be connected in a loop within single STP domain, but I cant find any document today...
Knowing that we can modify the timers, we are aiming for a fast converging network, so we wont increase the standard timers/delays.
(1) Can someone provide me the answer (and/or -any- URL)? And does Rapid STP change that amount?
(2) A second thought is, imagine we create a ring with the maximum amount of switches, but each one of them connecting another directly. Do we exceed the limit now? Or in other words, must we count these switches too to define the maximum hops?
(3) A last mind-breaker I have is: if we create, in a single STP domain, 2 independent rings with one common switch. Each ring contains, let say 5 switches, each connected to each neighbor and the 2 boundary switches to that common switch. I assume this setup work if we elect the common switch as Root Switch? What if we elect the Root Switch in the middle of ring A? We likely will exceed the maximum number of switches meaning HELLO packets will not arrive at time to middle switches of ring B ? Im I correct?
I think you are getting confused with the STP diamater value in a single STP domain with the number of switches used in a domain. STP converges well and its behaviour can be prediscted with in a diameter of 7 hops which is called as STP diameter. STP will still wotk above this value but it will hard to predict the behaviuor of it and how will it converge. That's why the recommended STP diamater is 7 hops from the root bridge. It actually doesnot matter the number of switches that you are using in your n/w ( dont know the max in an/w though :( ) but just keep in mind that when you are designing you n/w topology the 7 hops vlaue should not exceeded.
Thanks! "STP diameter" was the parameter that I was looking for. I knew all the way that it had the value of 7, in contradiction of some colleagues which have to buy me a beer now :D but one thing still kooks my noodles
Cisco quoted diameter of the STP domain (dia) as following: It is the maximum number of switches that you cross to link any two switches in the bridged network (including source and destination), if you assume the worst cases (without crossing twice the same switch, of course), which seems to be something else, according you described?
Anyway, to cut down a large complex network to match that dia, implementing MST Regions or routing seems to be inevitable!
It is the maximum number of switches that you cross to link any two switches in the bridged network (including source and destination), if you assume the worst cases (without crossing twice the same switch, of course), which seems to be something else, according you described ".
I think what was mentioned is absolutely correct and I do agree with this. 7 hops is the diameter inlcuding your source and the destination switches i.e inlcuding your root to the destination switch.
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...
Attached policy provides CLI access to the Cisco 4G router over text messaging. Two files are in the attached .tar file:
2. PDF with instructions on how to load and use the .tcl file.