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Configuration Guide - Ethernet Switching

CloudEngine 8800, 7800, 6800, and 5800 V200R003C00

This document describes the configuration of Ethernet services, including configuring MAC address table, link aggregation, VLANs, MUX VLAN, Voice VLAN, VLAN mapping, QinQ, GVRP, VCMP, STP/RSTP/MSTP, VBST, SEP, RRPP, ERPS, LBDT, and Layer 2 protocol transparent transmission.
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Licensing Requirements and Limitations for VBST

Licensing Requirements and Limitations for VBST

Involved Network Elements

Other network elements are not required.

Licensing Requirements

VBST is a basic function of the switch, and can be used without a license.

Version Requirements

Table 11-3 Products and minimum version supporting VBST

Product

Minimum Version Required

CE8860EI

V100R006C00

CE8861EI/CE8868EI

V200R005C10

CE8850-32CQ-EI

V200R002C50

CE8850-64CQ-EI

V200R005C00

CE7850EI

V100R006C00

CE7855EI

V200R001C00

CE6810EI

V100R006C00

CE6810LI

V100R006C00

CE6850EI

V100R006C00

CE6850HI

V100R006C00

CE6855HI

V200R001C00

CE6856HI

V200R002C50

CE6857EI

V200R005C10

CE6860EI

V200R002C50

CE6865EI

V200R005C00

CE6870-24S6CQ-EI/CE6870-48S6CQ-EI

V200R001C00

CE6870-48T6CQ-EI

V200R002C50

CE6875-48S4CQ-EI

V200R003C00

CE5810EI

V100R006C00

CE5850EI

V100R006C00

CE5850HI

V100R006C00

CE5855EI

V100R006C00

Feature Limitations

  • Table 11-4 describes the specifications of VBST.
    Table 11-4 Specifications of VBST

    Item

    Specification

    Number of protected VLANs

    • Versions earlier than V200R005C00: 128
    • V200R005C00 and later versions:

      CE6875EI, CE6870EI, CE6810EI, and CE5810EI: 240

      Other switch models: 500

    PV value (product of VBST-enabled interface quantity and VLAN quantity)

    • The CPU usage of VBST is in direct proportion to the PV value.

    • The device supports a maximum of 16000 PV values. The CE5810EI and CE5855EI support a maximum of 4000 PV values.
    • The number of PV values on a switch is the sum of PV values of cards installed on the switch.
    • The number of PV values of a stack is the sum of PV values of member switches.
    NOTE:

    If the number of PV values exceeds the maximum value, the CPU usage may exceed the threshold. As a result, there is a delay in processing tasks, protocol calculation is affected, and even the switch may fail to be managed by the NMS.

  • On networks that run STP/RSTP/MSTP/VBST, configure an optimal core switch as the root bridge to ensure stability of the STP Layer 2 network. Otherwise, new access devices may trigger STP root bridge switching, causing short service interruptions.

  • When VBST is enabled on a ring network, VBST immediately starts spanning tree calculation. Parameters such as the device priority and port priority affect spanning tree calculation, and changes to these parameters may cause network flapping. To ensure fast and stable spanning tree calculation, perform basic configurations on the switch and interfaces before enabling VBST.

  • VBST constructs a spanning tree in each VLAN so that traffic from different VLANs is forwarded through different spanning trees. Performance deterioration cannot be prevented when the network scale grows. Therefore, the network diameter cannot be larger than 7.
  • VBST cannot be enabled in the control VLAN used by ERPS or Smart Link.

  • M-LAG cannot be used in VBST scenarios.

  • GVRP cannot be used in VBST scenarios.

  • TRILL cannot be used in VBST scenarios.

  • VBST cannot be deployed on the user-side network of the VXLAN tunnel.

  • VBST supports only process 0. If other processes are configured on the device, the device cannot switch to the VBST mode.

  • If VLAN mapping, MUX VLAN, or VLAN stacking is configured on an interface corresponding to the VLAN, VBST negotiation for this VLAN will fail.

  • If 1:N (where N>1) mapping between MSTIs and VLANs has been configured on the switch, you must delete the mapping before changing the STP working mode to VBST.
  • Instance 4094 is reserved in VBST mode to prevent temporary loops. You cannot use the instance instance-id vlan vlan-id command to configure the mapping between instance 4094 and a VLAN. Before switching the VBST mode, delete the configuration of instance 4094 or use an available instance to replace instance 4094.
  • If the device has been configured as the root bridge or secondary root bridge, run the undo stp vlan vlan-id [ to vlan-id ] [ vlan-id [ to vlan-id ] ] &<1-9> root command to disable the root bridge or secondary root bridge function and run the stp vlan vlan-id [ to vlan-id ] [ vlan-id [ to vlan-id ] ] &<1-9> priority priority command to change the device priority.

  • To prevent frequent network flapping, ensure that the values of Hello time, Forward Delay, and Max Age conform to the following formulas:

    • 2 x (Forward Delay -1.0 second) ≥ Max Age

    • Max Age ≥ 2 x (Hello Time + 1.0 second)

  • After all ports are configured as edge ports and BPDU filter ports in the system view, none of ports on the switch send BPDUs or negotiate the VBST status with directly connected ports on the peer device. All ports are in forwarding state and this may cause loops on the network, leading to broadcast storms. Exercise caution when you configure a port as an edge port and BPDU filter port.

  • After a port is configured as an edge port and BPDU filter port in the interface view, the port does not process or send BPDUs. The port cannot negotiate the VBST status with the directly connected port on the peer device. The interface directly connected to a terminal needs to be configured as the edge port and BPDU filter port.

  • Root protection takes effect only on designated ports.

  • An alternate port is the backup of the root port. If a switch has an alternate port, you need to configure loop protection on both the root port and alternate port.

  • Loop protection and root protection cannot be configured on the same interface simultaneously.

  • The VBST and VPLS functions cannot be configured on a switch together.

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Updated: 2019-05-08

Document ID: EDOC1100004351

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