Dell Force10 MXL Blade - Modify Interface Parameters

344 | Multiple Spanning Tree Protocol (MSTP)
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Figure 19-8. BPDU Filtering enabled globally
Modify Interface Parameters
You can adjust two interface parameters to increase or decrease the probability that a port becomes a
forwarding port:
• Port cost is a value that is based on the interface type. The greater the port cost, the less likely the port
is selected to be a forwarding port.
• Port priority influences the likelihood that a port is selected to be a forwarding port in case that
several ports have the same port cost.
Table 19-2 lists the default values for port cost by interface.
Task Command Syntax Command Mode
Enable BPDU Filter globally to filter transmission of BPDU port fast
enabled interfaces.
edge-port bpdu filter
default
PROTOCOL MSTP
Table 19-2. MSTP Default Port Cost Values
Port Cost Default Value
1000-Mb/s Ethernet interfaces 20000
40-Gigabit Ethernet interfaces 1400
10-Gigabit Ethernet interfaces 2000
Port Channel with one 10-Gigabit Ethernet interface 2000
Port Channel with one 40-Gigabit Ethernet interface 1400