What is Per-VLAN Rapid Spanning Tree?
Per-VLAN Spanning Tree (PVST+)—PVST+ is a Cisco enhancement of STP that provides a separate 802.1D spanning-tree instance for each VLAN configured in the network. Rapid Spanning Tree Protocol (RSTP)—RSTP is defined in IEEE 802.1w. It is an evolution of STP that provides faster convergence than STP.
How do I configure Rapid Spanning Tree Protocol?
How do I configure Rapid Spanning Tree Protocol (RSTP, 802.1w) using the web interface on my managed switch?
- Select Switching > STP > STP Configuration. A screen similar to the following displays.
- Enter the following information: For Spanning Tree Admin Mode, select the Enable radio button.
- Click Apply.
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.
What is RSTP configuration?
RSTP Configuration Topology STP (Spanning Tree Protocol) has four states. These STP states are; Blocking, Listenning, Learning and Forwarding. With RSTP (Rapid Spanning Tree Protocol), the Spanning Tree state Blocking and Listenning are bypassed.
What are the benefits of using Per VLAN Spanning Trees?
Are you studying for the CCENT or CCNA certifications?
- PVST+ separates an instance of RSTP(802.1w) for each VLAN.
- PVST+ reduces the CPU usage and memory demands.
- PVST+ switches elect a root bridge automatically to enhance bandwidth usage.
- PVST+ allows Layer 3 load balancing without loops with no configuration.
Why do we use per VLAN in spanning-tree?
Per VLAN Spanning Tree (PVST) is a Cisco proprietary protocol that allows a Cisco device to have multiple spanning trees. The Cisco device can interoperate with spanning trees on other PVST devices but cannot interoperate with IEEE 802.1Q devices.
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.
What is Rapid Spanning Tree Protocol RSTP?
Rapid Spanning Tree Protocol (RSTP: IEEE 802.1w) is a network protocol that is an advancement over Spanning Tree Protocol (STP: IEEE802. RSTP prevents network loops when using multiple switches by blocking redundant paths on a network.
What is rapid Pvst mode?
Rapid per VLAN Spanning Tree (Rapid PVST+) is an updated implementation of STP that allows you to create one spanning tree topology for each VLAN. Rapid PVST+ is the default Spanning Tree Protocol (STP) mode on the switch. Spanning tree is used to refer to IEEE 802.1w and IEEE 802.1s.
What is the main benefit of using rapid Pvst +?
Rapid PVST+ (IEEE 802.1w) is an enhanced version of PVST+ and allows for faster spanning-tree calculations and convergence in response to Layer 2 topology changes. Rapid PVST+ defines three port states: discarding, learning, and forwarding, and provides multiple enhancements to optimize network performance.
How to set VLAN priority for a spanning tree?
spanning-tree vlan # priority #. This command is executed from global configuration mode and manually sets the bridge priority per vlan on a switch. show spanning-tree vlan #. This command can be executed only in privileged mode and displays spanning-tree information relating to a specific VLAN number.
Which is the default spanning tree on Cisco Catalyst?
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.
Which is the command for rapid spanning tree?
That’s it…just one command will enable rapid spanning tree on our switches. The implementation of rapid spanning tree is rapid-pvst. We are calculating a rapid spanning tree for each VLAN.
How to configure a VLAN as a root bridge?
To configure SW1 as the ROOT Bridge for VLAN 1 and 10, you can use one of two command. spanning-tree vlan # root primary which determines the best bridge priority and sets it to become the root bridge or you can use the spanning-tree vlan # priority # which manually specifies the priority on a per vlan basis.