Dell 53-1002116-01 manual Enabling a port interface as an edge port, Enabling the guard root

Configuring STP, RSTP, or MSTP on CEE interface ports 6

To configure the path cost for spanning tree calculations on the CEE interface, perform the following steps from Privileged EXEC mode.

1.Enter the configure terminal command to access global configuration mode.

2.Enter the interface command to specify the CEE interface type and slot/port number.

switch(config)#interface intengigabitethernet 0/1

3.Enter the no shutdown command to enable the CEE interface.

4.Enter the spanning-treecommand to configure the path cost for spanning tree calculations on the CEE interface.

switch(conf-if-te-0/1)#spanning-tree cost cost

Enabling a port (interface) as an edge port

From the CEE interface, use this command to enable the port as an edge port to allow the port to quickly transition to the forwarding state. To configure a port as an edge port, follow these guidelines:

•A port can become an edge port if no BPDU is received.

•When an edge port receives a BPDU, it becomes a normal spanning tree port and is no longer an edge port.

•Because ports that are directly connected to end stations cannot create bridging loops in the network, edge ports transition directly to the forwarding state and skip the listening and learning states.

•This command is only for RSTP and MSTP. Use the spanning-tree portfast command for STP (see “Enabling port fast (STP)” on page 61).

To enable the CEE interface as an edge port, perform the following steps from Privileged EXEC mode.

1.Enter the configure terminal command to access global configuration mode.

2.Enter the interface command to specify the CEE interface type and slot/port number.

switch(config)#interface intengigabitethernet 0/1

3.Enter the no shutdown command to enable the CEE interface.

5. Enter the spanning-treecommand to enable the CEE interface as an edge port.

switch(conf-if-te-0/1)#spanning-tree edgeport

6. Enter the spanning tree command again to assign a BPDU filter or BPDU guard.

switch(conf-if-te-0/1)#spanning-tree edgeport bpdu-filter

Enabling the guard root

From the CEE interface, use this command to enable the guard root on the switch. The guard root feature provides a way to enforce the root bridge placement in the network. With the guard root enabled on an interface, the switch is able to restrict which interface is allowed to be the spanning tree root port or the path to the root for the switch. The root port provides the best path from the switch to the root switch. By default, guard root is disabled.

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