Alcatel-Lucent AOS-W 6.5.3.x - Page 256

256| BranchSwitch Config for Cloud Services Switches AOS-W 6.5.3.x| User Guide
In the global RSTPmode there is only one RSTP instance running in the entire switch. If the port that is enabled
with PortFast and BPDU Guard receives any STP BPDU it will effect all the ports, as the global RSTP runs on a
port basis.
In the PVST mode there can be multiple instances of RSTP running as they are based on per VLAN. Though it is
based on per VLAN, it will still behave in the same way as it does in the global RSTP mode. For example, if there
are five VLANs and each VLAN has a separate RSTP instance running, then any STP BPDU received on any of
these five ports effects all ports.
If an STP BPDU is received from any one of the five RSTP instances running, the port that is enabled with BPDU
Guard shuts down and goes to ErrDis state. In other words both PortFast and BPDU Guard features are
applied on a port basis for both global RSTP and PVST modes, even though the PVST runs on a per VLAN basis.
Enabling PortFast and BPDU Guard on a Port
The following section guides you to enable the PortFast and BPDU Guard features on a port.
In the Web UI
Follow the steps below to enable PortFast and BPDU Guard features on a port using the WebUI:
1. Navigate to Configuration>Branch>Smart Config and select the Networking tab.
2. In the Ports table, click the port number for which you want to enable PortFast and BPDU Guard.
3. Click Edit.
4. Select the PortFast and BPDU Guard checkbox.
5. Click Update.
To disable PortFast and BPDU Guard uncheck the PortFast and BPDU Guard checkboxes.
It is recommended to enable PortFast only on access port types. However, PortFast can be enabled on the trunk ports
by selecting the Trunk checkbox in the WebUI.
In the CLI
Execute the following commands at the command prompt to enable PortFast and BPDUGuard:
(host) (config) #interface gigabitinternet 0/0/4
(host) (config-if)#spanning-tree portfast
(host) (config-if)#spanning-tree bpduguard
To disable PortFast
(host) (config-if) #no spanning-tree portfast
(host) (config-if) #no spanning-tree bpduguard
Execute the following command to enable PortFast on trunk ports:
(host) (config) #interface gigabitethernet 0/0/4
(host) (config-if)#spanning-tree portfast trunk
Execute the following show command to display the status of the STP ports in Global RSTP mode.
(host) (config-if) #show spanning-tree interface gigabitethernet 0/0/4
Execute the following show command to display the status of the STP ports in Instance RSTP (PVST) mode.
(host) #show spanning-tree interface gigabitethernet 0/0/4
Execute the following command to display the status of BPDU Guard enabled port that is in ErrDis state. This
command is applicable for ports that are in both the Global RSTP and Instance RSTP (PVST) modes.
(host) (config-if) #show spanning-tree interface gigabitethernet 0/0/4