Should I enable STP?
Broadcast storms caused by loops can slow or stop traffic on your network, but STP can prevent loops by ensuring that only one path between each set of switches is active. You must enable or disable STP or RSTP for each network location in which you are using Insight Managed Switches. By default, STP is disabled.
What is STP bridge priority?
Every switch taking part in spanning tree has a bridge priority. The switch with the lowest priority becomes the root bridge. If there’s a tie, then the switch with the lowest bridge ID number wins.
What is root bridge in STP?
The Root bridge (switch) is a special bridge at the top of the Spanning Tree (inverted tree). The branches (Ethernet connections) are then branched out from the root switch, connecting to other switches in the Local Area Network (LAN). All Bridges (Switches) are assigned a numerical value called bridge priority.
How do you find the root bridge in STP?
The root bridge is selected by manually configuring its bridge priority to a low value. 32768 is the default value out of a range from 0 to 61440. If all switches in a single spanning tree have the same bridge priority, the switch with the lowest MAC address will become the root bridge.
Why is STP needed?
The Spanning Tree Protocol (STP) is a network protocol that builds a loop-free logical topology for Ethernet networks. The basic function of STP is to prevent bridge loops and the broadcast radiation that results from them. RSTP was designed to be backwards-compatible with standard STP.
How is bridge ID calculated?
Every switch has an identity when they are part of a network. This identity is called the Bridge ID or BID. It is an 8 byte field which is divided into two parts. The first part is a 2-byte Bridge Priority field (which can be configured) while the second part is the 6-byte MAC address of the switch.
What is bridge ID?
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. The VLAN ID ranges from 1 to 4096. Copyright © 2010, 2012, Oracle and/or its affiliates.
How does a STP work on a bridge?
Each bridge communicates with other bridges to discover how they are interconnected. This information is then used to eliminate cycles, and provide optimal routing of packets. STP also provides fault tolerance, because it will recompute the topology if a bridge or port fails.
Which is the root bridge in STP spanning tree?
All the bridges in a LAN have a path to the root. STP allows you to select the root bridge automatically. However, if the STP network admin wants, he or she can change the RB according to the network. A noon-root Bridge is any bridge that is not the root bridge. The root port is a port that leads towards the Root Bridge.
Which is the best configuration for STP interoperability?
Therefore, the best configuration for STP interoperability is to have the bridge STP feature enabled and VLANs not configured. Note When Cisco bridges are configured as workgroup bridges, they can operate with STP disabled and allow for associations with access points. However, this configuration is not technically a bridge-to-bridge scenario.
What is the bridge ID in Cisco spanning tree?
A bridge ID, consisting of the bridge priority and the MAC address, is associated with each instance. For each VLAN, the bridge with the lowest bridge ID becomes the spanning-tree root for that VLAN. Cisco bridges are interoperable when STP is enabled and no VLANs are configured.