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What is the Cisco proprietary standard for the Spanning Tree Protocol?
IEEE 802.1D
IEEE 802.1D is the original standard. STP creates one spanning-tree instance for the entire bridged network, regardless of the number of VLANs. However, because there is only one root bridge, traffic for all VLANs flows over the same path, which can lead to suboptimal traffic flows.
Is MST Cisco proprietary?
MST is a new IEEE standard derived from Cisco’s proprietary Multi-Instance Spanning-Tree Protocol (MISTP) implementation. With MST, you can map a single spanning-tree instance to several VLANs.
Is Rapid PVST+ Cisco proprietary?
Rapid PVST+ (Rapid Per VLAN Spanning Tree Plus) is also a Cisco proprietary STP version. Again, it has an instance for each VLAN and each VLAN has a separate STP process. It has a faster convergence advantage if we compare it with PVST+.
Is RSTP Cisco proprietary?
It maintains a spanning tree instance for each individual VLAN configured in the network. It is basically on each VLAN independently. It is based on the 802.1D standard and uses Cisco proprietary ISL trunking protocol. RSTP operates much like STP with Cisco’s enhancements while PVST is a Cisco proprietary in itself.
What is the purpose of Pvst?
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.
What are the functions of the Cisco spanning tree protocol?
This section describes the specific functions that are common to all spanning tree protocols. The Cisco proprietary spanning tree protocols, PVST+ and MISTP, are based on the IEEE 802.1D STP. (See the “Understanding How PVST+ and MISTP Modes Work” section for information about PVST+ and MISTP.)
Is the Cisco Multiple Spanning Tree Protocol RSTP or MST?
Multiple Spanning Tree (MST) is an IEEE standard inspired from the Cisco proprietary Multiple Instances Spanning Tree Protocol (MISTP) implementation. This document assumes that the reader is familiar with Rapid STP (RSTP) (802.1w), as MST heavily relies on this other IEEE standard. This table shows the support for MST in various Catalyst switches:
Is the Cisco spanning tree based on IEEE 802.1D?
The Cisco proprietary spanning tree protocols, PVST+ and MISTP, are based on the IEEE 802.1D STP. (See the “Understanding How PVST+ and MISTP Modes Work” section for information about PVST+ and MISTP.)
Can a network have more than one spanning tree?
This standard defines a Common Spanning Tree (CST) that only assumes one spanning tree instance for the entire bridged network, regardless of the number of VLANs. If the CST is applied to the topology of this diagram, the result resembles the diagram shown here: In a network running the CST, these statements are true: