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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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Comparison Between STP on Huawei and Cisco Switches

Comparison Between STP on Huawei and Cisco Switches

Packet Processing Mode

Processing mode of Cisco PVST+ BPDUs (the implementation is similar to that of Rapid PVST+ BPDUs)

  • On a trunk interface:

    • In VLAN 1, a PVST+ device sends standard STP BPDUs and untagged PVST BPDUs to negotiate with the remote device.

    • In the native VLAN but not VLAN 1, a PVST+ device sends untagged PVST BPDUs to negotiate with the remote device.

    • In other VLANs, a PVST+ device sends PVST BPDUs to negotiate with the remote device.

    • A PVST+ device sends standard STP BPDUs to negotiate with the remote device in VLAN 1 after the no spanning-tree vlan 1 command is configured globally.

  • On an access interface:

    In all VLANs, a PVST+ device sends standard STP BPDUs to negotiate with the remote device.

NOTE:

By default, VLAN 1 is the native VLAN on a Cisco switch.

Processing of Huawei VBST BPDUs

  • On a trunk interface:

    • In VLAN 1, a VBST-enabled device sends standard STP or RSTP BPDUs and VBST BPDUs to negotiate with the remote device.

    • In other VLANs, a VBST-enabled device sends VBST BPDUs to negotiate with the remote device.

  • On an access interface:

    A VBST-enabled device sends standard STP or RSTP BPDUs to negotiate with the remote device only in the VLAN where the access interface is located.

NOTE:

The Data field of VBST BPDUs and selection of packets of a standard protocol depend on the remote device connected to the Huawei S series switch. By default, standard RSTP BPDUs are used.

Differences in Command Formats

Table 5-11  Differences in command formats

Function

Command on Huawei Switches

Command on Cisco Switches

Configure a spanning tree mode.

stp mode

spanning-tree mode

Configure a path cost algorithm.

stp pathcost-standard

spanning-tree pathcost method

Configure a fast transition mode on an interface.

stp no-agreement-check

-

NOTE:

No such command is available on Cisco switches. Cisco switches support different convergence modes depending on the product model. For details, see Cisco product manuals.

Enable digest snooping.

stp config-digest-snoop

-

NOTE:

No such command is available on Cisco switches. Cisco switches do not support digest snooping.

Differences Between Path Cost Algorithms

Table 5-12  Differences between path cost algorithms

Path Cost Algorithm

Command on Huawei Switches

Command on Cisco Switches

Query Command

Configuration Command

Query Command

Configuration Command

IEEE 802.1t

display stp

stp pathcost-standard dot1t

show spanning-tree detail

spanning-tree pathcost method long

IEEE 802.1d-1998

stp pathcost-standard dot1d-1998

spanning-tree pathcost method short

Differences in Digests of an MSTP Region

Before the 802.1s standard (MSTP) is released, vendors use different formats of digest fields in MSTP BPDUs. When devices from different vendors interwork with each other, negotiation may fail.

When a Huawei S series switch is connected to a Cisco switch, the two devices may fail to communicate because of different keys in BPDUs even though they have the same domain name, revision level, and VLAN mapping table. To solve this problem, enable digest snooping on the interface of the Huawei S series switch connected to the remote device. This function enables the Huawei switch to use the same key as the remote device, so that the Huawei S series switch can negotiate with the remote device.

Table 5-13  Comparison between digest commands

Function

Command on Huawei Switches

Command on Cisco Switches

Check the digest information.

display stp region-configuration digest

show spanning-tree mst digest

Enable digest snooping.

stp config-digest-snoop

-

NOTE:

No such command is available on Cisco switches. Cisco switches do not support digest snooping.

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Updated: 2019-05-15

Document ID: EDOC1000114005

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