DELL 9.7(0.0) User Manual

• Change the max-age parameter.

PROTOCOL SPANNING TREE RSTP mode

max-age seconds

The range is from 6 to 40.

The default is 20 seconds.

To view the current values for global parameters, use the show spanning-tree rstp command from 
EXEC privilege mode.

Enabling SNMP Traps for Root Elections and Topology Changes

To enable SNMP traps, use the following command.

• Enable SNMP traps for RSTP, MSTP, and PVST+ collectively.

snmp-server enable traps xstp

Modifying Interface Parameters

On interfaces in Layer 2 mode, you can set the port cost and port priority values.

• Port cost — a value that is based on the interface type. The previous table lists the default values. 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.

To change the port cost or priority of an interface, use the following commands.

• Change the port cost of an interface.

INTERFACE mode

spanning-tree rstp cost cost

The range is from 0 to 65535.

The default is listed in the previous table.

• Change the port priority of an interface.

INTERFACE mode

spanning-tree rstp priority priority-value

The range is from 0 to 15.

The default is 128.

To view the current values for interface parameters, use the show spanning-tree rstp command 
from EXEC privilege mode.

Rapid Spanning Tree Protocol (RSTP)

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