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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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Interoperation and Replacement Solution for STP

Interoperation and Replacement Solution for STP

Overview of the Interoperation and Replacement Solution

There are three interworking and replacement solutions.

  • Huawei switches transparently transmit PVST BPDUs, and Cisco switches remove loops through negotiation.
  • Huawei switches running VBST interwork with Cisco switches running PVST, PVST+, or Rapid PVST+.
  • Huawei switches running MSTP interwork with Cisco switches running MST.

Applicable Models and Versions

All models and versions of Huawei switches support MSTP, whereas VBST is supported in V200R005 and later versions.

Interoperation Analysis

A Huawei S series switch running VBST interworks with a Cisco switch running PVST, PVST+, or Rapid PVST+. They process protocol packets using the same mechanism, identify packets of each other, and use the same multicast MAC address 01-00-0C-CC-CC-CD. That is, their communication is similar to the communication between Huawei switches running VBST.

When a Huawei S series switch enabled with MSTP interworks with a Cisco switch running MST, digest snooping needs to be enabled on the Huawei S series switch because their digest formats are different. Their other implementations are the same.

A Cisco switch running PVST+ or Rapid PVST+ sends both PVST BPDUs and STP or RSTP BPDUs to negotiate with the remote device, so a Huawei S series switch running STP or RSTP can interwork with the Cisco switch. STP or RSTP convergence on the Huawei S series switch is based on ports, whereas PVST+ or Rapid PVST+ convergence on the Cisco switch is based on VLANs. The convergence results are as follows:

  • When a blocked port is located on the Huawei S series switch, data packets of all VLANs including PVST BPDUs of the Cisco switch are discarded on the blocked port. Therefore, the port is blocked in any VLAN.

  • When a blocked port is located on the Cisco switch, the Cisco switch running PVST+ or Rapid PVST+ only sends standard STP or RSTP BPDUs to negotiate with the remote device in VLAN 1. In this case, the blocked port only blocks packets from VLAN 1. It normally processes and forwards PVST BPDUs of other VLANs, and calculates the spanning tree of the VLAN where the port is located. The Huawei S series switch running STP or RSTP does not process PVST BPDUs, so blocked ports in other VLANs must be located on the Cisco switch.

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Updated: 2019-05-15

Document ID: EDOC1000114005

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