10-15-2013 04:22 AM - edited 03-07-2019 04:02 PM
Is the port identifier = port priority and MAC address
or
port identifier = port priority and inteface number (Eg: 128.2 here 128 is port priority and 2 is interface numeber such as Fa0/2)
Which is corrrect ? I'm bit confused.
Actually i got this doubt as i was reading the below info on cisco site:
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The stable, active spanning-tree topology of a switched network is controlled by these elements:
•The unique bridge ID (switch priority and MAC address) associated with each VLAN on each switch. In a switch stack, all switches use the same bridge ID for a given spanning-tree instance.
•The spanning-tree path cost to the root switch.
•The port identifier (port priority and MAC address) associated with each Layer 2 interface.
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Regards,
Chandu
10-15-2013 05:00 AM
Chandu,
In STP, the Port ID has two parts: configurable priority and a fixed port number (which is not the MAC address). On many switches, the port number is exactly the number after the slash, i.e. Fa0/1 is 128.1, Fa0/24 is 128.24. On some switches having GigE uplinks, Gi0/1 is 128.1, Gi0/2 is 128.2, and Fa0/1 starts with 128.3, Fa0/2 continues with 128.4, etc. The port numbers have no particular meaning except being unique for each port on a switch.
Best regards,
Peter
10-17-2013 01:09 AM
Peter, so as per your reply. I think cisco mention the third point worngly.
Regards,
Chandu
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