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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 2: Huawei Switches Use VBST to Interwork with Cisco PVST Switches

Interoperation and Replacement Solution 2: Huawei Switches Use VBST to Interwork with Cisco PVST Switches

Overview

Huawei switches are configured with VBST to interwork with Cisco PVST switches to remove loops.

Networking Requirements

In Figure 5-19, all switches are Cisco switches. Layer 3 switches establish a virtual switching system (VSS) to implement connectivity. Two aggregation switches establish a port channel in manual mode to provide link redundancy. They are configured with OSPF and establish OSPF relationships with core switches to receive and transmit routes, and are configured with the Hot Standby Router Protocol (HSRP) to implement virtual gateway backup. Switches are enabled with Rapid PVST+ to remove loops.

Cisco switches use the short algorithm to calculate the path cost. The short algorithm corresponds to the dot1d-1998 algorithm on Huawei switches. Cisco switches do not support fast transition in enhanced mode, whereas Huawei switches use fast transition in enhanced mode by default. You must run the stp no-agreement-check command to configure fast transition in common mode on the interfaces that do not support fast transition in enhanced mode.

Huawei switches need to replace the two aggregation switches, without changing the network plan.

Figure 5-19  Networking where Huawei switches use VBST to interwork with Cisco PVST switches

Configuration Roadmap

  1. Configure OSPF on Huawei switches to establish OSPF relationships with core switches to receive and transmit routes.

  2. Configure link aggregation in manual mode on Huawei switches to implement load balancing.

  3. Configure VRRP on Huawei switches to interwork with and replace HSRP on Cisco switches. VRRP implements virtual gateway backup.

  4. Configure VBST on Huawei switches to interwork with Rapid PVST+ on Cisco switches.

    1. Configure Huawei switches to work in VBST mode.

    2. Configure Huawei switches to use the dot1d-1998 algorithm to calculate the path cost.

    3. Configure fast transition in common mode on Huawei switches.

  5. Configure service forwarding on Huawei switches based on the original network plan.

Procedure

During migration, connect Huawei switches in bypass mode and establish OSPF routes. Migrate services on access switches to Huawei switches one by one.

  1. Check the configuration of Cisco switches before the replacement.

    1. Run the show running-config command to check the spanning tree configuration on Cisco switches.

    2. Run the show spanning-tree summary command to check spanning tree parameters and status information on Cisco switches.

    Cisco switches use Rapid PVST+ to calculate spanning trees and use the short algorithm to calculate the path cost. In addition, they do not support fast transition in enhanced mode.

  2. Power on two Huawei switches, and connect links between them and their uplinks. Configure addresses for downlink interfaces of core switches, and configure addresses for uplink interfaces and loopback addresses on Huawei switches. Complete the configuration on Huawei switches, and shut down VLANIF 10 and VLANIF 20 on HuaweiA and HuaweiB. Retain the configuration of Cisco switches.

    Configure VBST on Huawei switches.

    1. Configure HuaweiA and HuaweiB to work in VBST mode.

      # Configure HuaweiA.

      <HUAWEI> system-view
      [HUAWEI] sysname HuaweiA
      [HuaweiA] stp mode vbst
      

      # Configure HuaweiB.

      <HUAWEI> system-view
      [HUAWEI] sysname HuaweiB
      [HuaweiB] stp mode vbst
      
    2. Configure Huawei switches to use the dot1d-1998 algorithm to calculate the path cost.

      # Configure HuaweiA.

      [HuaweiA] stp pathcost-standard dot1d-1998
      

      # Configure HuaweiB.

      [HuaweiB] stp pathcost-standard dot1d-1998
      
    3. Configure fast transition in common mode on Huawei switches.

      # Configure HuaweiA.

      [HuaweiA] interface gigabitethernet 0/0/1
      [HuaweiA-GigabitEthernet0/0/1] stp no-agreement-check
      [HuaweiA-GigabitEthernet0/0/1] quit
      [HuaweiA] interface gigabitethernet 0/0/2
      [HuaweiA-GigabitEthernet0/0/2] stp no-agreement-check
      [HuaweiA-GigabitEthernet0/0/2] quit
      

      # Configure HuaweiB.

      [HuaweiB] interface gigabitethernet 0/0/1
      [HuaweiB-GigabitEthernet0/0/1] stp no-agreement-check
      [HuaweiB-GigabitEthernet0/0/1] quit
      [HuaweiB] interface gigabitethernet 0/0/2
      [HuaweiB-GigabitEthernet0/0/2] stp no-agreement-check
      [HuaweiB-GigabitEthernet0/0/2] quit
      
  3. Migrate services of the backup uplink of CiscoD to HuaweiB and shut down VLANIF 20, as shown in Figure 5-20.

    Figure 5-20  Migration process 1
  4. Disconnect the cable between CiscoA and CiscoD, shut down VLANIF 20 on CiscoA and CiscoB, and enable VLANIF 20 on Huawei switches.

  5. Test services on CiscoD. When verifying that services on CiscoD are normal, migrate services on the link between CiscoD and CiscoA to HuaweiA. The migration of the access switch is completed, as shown in Figure 5-21.

    Figure 5-21  Migration process 2
  6. Perform the preceding steps to migrate services on downstream access switches one by one. Figure 5-22 shows the network where migration is completed.

    Figure 5-22  Network where migration is completed
  7. Check the configuration of Huawei switches after the replacement.

    1. Run the display stp [ vlan vlan-id ] [ interface interface-type interface-number | slot slot-id ] [ brief ] command to check the spanning tree status and statistics on Huawei switches.

    2. Run the show spanning-tree summary command to check spanning tree status information on Cisco switches.

    3. Verify services on user-side devices and check whether the replacement is successful.

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Updated: 2019-05-15

Document ID: EDOC1000114005

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