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S2700, S3700, S5700, S6700, S7700, and S9700 Series Switches Interoperation and Replacement Guide

This document provides typical configuration examples for interoperation between Huawei switches and mainstream IP phones, firewalls, routers, Microsoft NLB servers, multi-NIC servers, Cisco switches, and SolarWinds.
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Overview of Spanning Tree Protocols on Cisco Switches

Overview of Spanning Tree Protocols on Cisco Switches

Cisco switches support the following spanning tree protocols: Per VLAN Spanning Tree (PVST), Per VLAN Spanning Tree Plus (PVST+), Rapid PVST+, and Multiple Spanning Tree (MST).

Cisco Catalyst series switches of IOS 12.2 and later versions support PVST, PVST+, Rapid PVST+, and MST. Some BPDUs of these spanning tree protocols use Cisco proprietary BPDU formats, which are different from the BPDU format defined by the IEEE. Trunk interfaces on Cisco switches enabled with PVST+ or Rapid PVST+ send Cisco proprietary BPDUs in VLANs but not VLAN 1. The source MAC address of these BPDUs is the MAC address of the trunk interface, and the destination MAC address is Cisco's reserved MAC address 01-00-0C-CC-CC-CD.

PVST Principles

PVST can be considered as STP running in each VLAN. Each VLAN has an independent STP status and a spanning tree calculated. Although PVST does not define the instances used in MSTP, PVST can load balance traffic from different VLANs. PVST BPDUs carry VLAN information in data frames. The destination MAC address of PVST BPDUs is 01-00-0C-CC-CC-CD; therefore, PVST cannot interwork with standard IEEE spanning tree protocols.

PVST+ Principles

To interwork with standard IEEE spanning tree protocols, Cisco develops PVST+ based on PVST. PVST+ provides interoperation with standard spanning tree protocols, which is an improvement made to PVST.

On an access interface, PVST+ sends standard STP BPDUs in its native VLAN. On a trunk interface, PVST+ sends standard STP BPDUs with the destination MAC address of 01-80-C2-00-00-00 only in VLAN 1, and sends Cisco proprietary BPDUs with the destination MAC address of 01-00-0C-CC-CC-CD in other VLANs allowed by the trunk interface.

Huawei switches support standard IEEE spanning tree protocols, and can process standard STP BPDUs from Cisco switches. However, Huawei switches forward Cisco proprietary BPDUs as multicast packets but not process them.

Rapid PVST+ Principles

Rapid PVST+ is an extension of PVST+. Compared with PVST+, Rapid PVST+ uses the Rapid Spanning Tree Protocol (RSTP) mechanism to implement rapid transition.

MST Principles

Cisco MST supports VLAN-instance mapping and defines the region; therefore, it can be considered as a standard MSTP protocol. MST BPDUs use the standard format defined by the IEEE. Huawei and Cisco switches use different keys to generate MSTP digests in BPDUs, so the digests in BPDUs are different. By default, MSTP and Cisco MST can implement only inter-region interworking because Huawei and Cisco switches generate different digests. To enable MSTP and Cisco MST to interwork within an MST region, enable digest snooping on a Huawei S series switch connected to a Cisco switch and the Huawei S series switch's interface connected to the Cisco switch.

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Updated: 2019-05-15

Document ID: EDOC1000114005

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