08-21-2008 10:19 PM - edited 03-06-2019 12:57 AM
Hi Experts ,
I would like to know the maximum number 2960 switches can be cascaded.
How many 2960 swutches we can connect in cascaded position.Is there any doc.
Thanks,
Satish
08-21-2008 10:32 PM
Hi,
The conservative default values for the STP timers impose a maximum network diameter of seven. This maximum network diameter restricts how far away from each other bridges/switches in the network can be. In this case, two distinct bridges/switches cannot be more than seven hops away from each other
When a BPDU propagates from the root bridge toward the leaves of the tree, the age field increments each time the BPDU goes though a bridge/switch. Eventually, the bridge discards the BPDU when the age field goes beyond maximum age. If the root is too far away from some bridges/switch of the network, this issue can occur. This issue affects convergence of the spanning tree.
http://www.cisco.com/en/US/tech/tk389/tk621/technologies_tech_note09186a00800951ac.shtml
So it's 7 !!!
HTH..
08-21-2008 10:44 PM
Hi Satish ,
Thanks for the info.Is there any doc which specifies switch model and max.limit of switches can be connected in cascade position.
Thanks,
Satish
08-21-2008 10:56 PM
Use the diameter keyword to specify the Layer 2 network diameter (that is, the maximum number of switch hops between any two end stations in the Layer 2 network). When you specify the network diameter, the switch automatically sets an optimal hello time, forward-delay time, and maximum-age time for a network of that diameter, which can significantly reduce the convergence time. You can use the hello keyword to override the automatically calculated hello time
this is the document.
Command is :
spanning-tree vlan vlan-id root primary [diameter net-diameter [hello-time seconds]]
(Optional) For diameter net-diameter, specify the maximum number of switches between any two end stations. The range is 2 to 7.
HTH..
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