10-07-2013 04:16 AM - edited 03-07-2019 03:52 PM
Is there any formula to calculate the number of ports that will go into blocking state by looking at the topology.
Regards,
Chandu
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10-07-2013 04:27 AM
Hi,
Assume you are talking about spanning tree. If you have all the switch and link cost information, yes, you can tell the ports will be in blocking state by looking the topology. The formula is SPT path selection process.
http://www.cisco.com/en/US/tech/tk389/tk621/technologies_configuration_example09186a008009467c.shtml
HTH,
Lei Tian
10-07-2013 04:27 AM
Hi,
Assume you are talking about spanning tree. If you have all the switch and link cost information, yes, you can tell the ports will be in blocking state by looking the topology. The formula is SPT path selection process.
http://www.cisco.com/en/US/tech/tk389/tk621/technologies_configuration_example09186a008009467c.shtml
HTH,
Lei Tian
10-07-2013 05:56 AM
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All multiple paths in the same L2 domain, but one should be blocked. However, the later versions of STP are often per VLAN so on trunk ports, blockage will be per VLAN on that port not the port itself. (Note: Similar for MST.)
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