How do I change spanning-tree port priority?
We can change the Spanning Tree Port Priority value, using the interface configuration commad “spanning-tree vlan port-priority “, as shown below. You may change the Spanning Tree Port Priority value only in increments of 16.
What is port priority in spanning-tree?
When a loop occurs in a network topology, spanning tree can use the port priority value for the ports to decide which port must be put in forwarding state. The port priority is only used to determine the topology if the loop in the network cannot be resolved using bridge IDs or path cost.
What is bridge ID priority in STP?
Each switch has a unique bridge identifier (bridge ID), that determines the selection of the root switch. The bridge ID is an 8-byte field that is composed of two sub fields: The value for the priority ranges from 0 to 61440 in steps of 4096. The default value for the priority is 32768.
What are the default STP bridge priority?
32768
The bridge priority default is 32768 and can only be configured in multiples of 4096.
How do I set port priority?
You can configure the port priority with this interface-configuration command: Switch(config-if)# spanning-tree [vlan vlan-list] port-priority port-priority You can modify the port priority for one or more VLANs by using the vlan parameter.
How do I change the priority of a root bridge?
If an alternate root bridge is desired, use the spanning-tree vlan vlan-id root secondary global configuration mode command. This command sets the priority for the switch to the predefined value 28,672. This ensures that the alternate switch becomes the root bridge if the primary root bridge fails.
What is bridge priority?
The bridge priority determines which bridge is elected as the root bridge. If two bridges have the same path cost to the root bridge, the bridge priority determines which bridge becomes the designated bridge for a LAN segment.
What is port priority?
Port priority (also known as controller slot priority) is a set of rules that determine the outcome of certain situations between characters, during matches.
What is meant by bridge priority?
What is the best practices when setting STP priority?
It is best practices to set a layered approach to the STP priorities in a network. For instance, if there is a clear Core <> Distribution <> Access Layer, priorities should be Core (4096), Distribution (16384), and Access (61440).
How to set root bridge priority in spanning tree?
If an alternate root bridge is desired, use the spanning-tree vlan vlan-id root secondary global configuration mode command. This command sets the priority for the switch to the predefined value 28,672.
What is the bridge priority of a Cisco switch?
Every Bridge (Switch) Participating in a Spanning Tree Protocol network is assigned with a numerical value called Bridge Priority (Switch Priority) Value. By default, all Cisco Switches has a Bridge Priority (Switch Priority) value of 32,768.
Which is the lowest VLAN priority in spanning tree?
A number of Cisco IOS command parameters are associated with the show spanning-tree command. In Example 3-11, the output shows that the priority for VLAN 10 is 4096, the lowest of the three respective VLAN priorities.
Which is the root port of a spanning tree?
• The port identifier (MAC address of the port) that is associated with each switch port In a switched network, the root switch is the logical center of the spanning tree topology. A spanning tree protocol uses BPDUs to elect the root switch and root port for the switched network and the root port and designated port for each switched segment.