88
Link speed
Port type
Path cost
IEEE
802.1d-1998
IEEE 802.1t
Private
standard
containing four Selected
ports
100 Mbps
Single port
19
200000 200
Aggregate interface
containing two Selected
ports
100000 180
Aggregate interface
containing three Selected
ports
66666 160
Aggregate interface
containing four Selected
ports
50000 140
1000 Mbps
Single port
4
20000 20
Aggregate interface
containing two Selected
ports
10000 18
Aggregate interface
containing three Selected
ports
6666 16
Aggregate interface
containing four Selected
ports
5000 14
10 Gbps
Single port
2
2000 2
Aggregate interface
containing two Selected
ports
1000 1
Aggregate interface
containing three Selected
ports
666 1
Aggregate interface
containing four Selected
ports
500 1
20 Gbps
Single port
1
1000 1
Aggregate interface
containing two Selected
ports
500 1
Aggregate interface
containing three Selected
ports
333 1
Aggregate interface
containing four Selected
ports
250 1
Configuring path costs of ports
When the path cost of a port changes, the system recalculates the role of the port and initiates a
state transition.