How do I enable a spanning tree for a VLAN?
Step 1 – enabling STP
- switch>enable – It is used to enter privileged mode.
- switch#configure terminal – It is used to enter the switch management interface.
- switch(config)#spanning-tree vlan vlan-id – We use this command to enable the spanning tree protocol on our VLAN.
How does STP work with VLANs?
Spanning Tree Protocol (STP) prevents loops in networks and VLAN (Virtual Local Area Network) is used to create many virtual Local Area Networks. STP can be implemented in VLANs. STP puts certain paths into a blocked state (backup links) and the primary links into a forwarding state.
How do I enable Spanning Tree Protocol?
Select the network location for which you want to enable or disable STP. Select Wired > Settings > Spanning Tree. Under Spanning Tree Mode, select Disable, STP, or RSTP. Tap Save.
How do you set spanning tree priority on a Cisco switch?
To ensure that a switch has the lowest bridge priority value, use the spanning-tree vlan vlan-id root primary command in global configuration mode. The priority for the switch is set to the predefined value of 24,576 or to the highest multiple of 4096 less than the lowest bridge priority detected on the network.
How do I enable spanning tree Portfast on a Cisco switch?
Configure the Spanning-Tree portfast Setting
- Enter the configuration mode for the interface.
- Shut down the interface.
- Change the portfast setting.
- Review the portfast status.
- Reset the default spanning tree portfast value for the interface.
- Review the portfast status.
Which command disables the trunking configuration on a switch interface?
To avoid trunking misconfigurations, configure interfaces connected to devices that do not support DTP to not forward DTP frames, that is, to turn off DTP. If you do not intend to trunk across those links, use the switchport mode access interface configuration command to disable trunking.
Is STP enabled by default on Cisco switches?
yes, they are enabled by default. You need to do “set spantree disable” to disable it. by default , Spanning tree is enabled on a switch. but to take the advantage of spanning tree ..you need to configure a suitable switch in your topology as a root bridge.
Which configuration mode allows to configure a particular port on a switch?
Switch ports can be manually configured with specific duplex and speed settings. Use the duplex interface configuration mode command to manually specify the duplex mode for a switch port.
Which vlan is the default vlan for a switch?
The default VLAN is always VLAN 1, and it can’t be changed. By default, Native VLAN is VLAN 1, but it can be changed to any VLAN.
What is STP configuration?
The Spanning Tree Protocol (STP) is defined by IEEE standard 802.1D-1988. The STP generates a single spanning tree inside a network. Such mode proved to be useful for supporting applications and protocols in which frames are delivered out of sequence or as duplicates.
What is the command to configure all access ports for PortFast?
To configure PortFast on a switch port, enter the spanning-tree portfast interface configuration mode command on each interface that PortFast is to be enabled, as shown in Figure 2. The spanning-tree portfast default global configuration mode command enables PortFast on all nontrunking interfaces.
How does configuring a port with PortFast allow for faster convergence?
How does configuring a port with PortFast allow for faster convergence? PortFast allows for an access port to immediately transition into a forwarding state which decreases Layer 2 convergence time.
What is the Spanning Tree Protocol?
The original Spanning Tree protocol (802.1d) is quite outdated by today’s standards and only worked on a single VLAN or a single switch that does not support VLAN’s. Cisco saw the need for Spanning Tree on all VLAN’s and create the proprietary PVST and PVST+ protocols which enable spanning-tree on a per vlan instance.
What is spanning tree in Cisco PVST?
Cisco saw the need for Spanning Tree on all VLAN’s and create the proprietary PVST and PVST+ protocols which enable spanning-tree on a per vlan instance. So in this case every single vlan on each switch has its own STP process running to detect and eliminate loops in a layer two switching network.
What is the default spanning tree mode on a Cisco Catalyst switch?
The default Spanning Tree mode is PVST on a Cisco Catalyst switch. In this lab you will familiarize yourself with the following commands; This command is executed from global configuration mode and configures the VLAN specified in the syntax on the switch you’re currently configuring as the root bridge for the specific VLAN on the network.
How to configure spanning tree forward delay time for a VLAN?
Spantree 1 hello time set to 3 seconds. Enter the set spantree fwddelay command to configure the spanning tree forward delay time for a VLAN. The possible range for delay is from 4-30 seconds.