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Configuration Guide - Ethernet Switching

S1720, S2700, S5700, and S6720 V200R012(C00 and C20)

This document describes the configuration of Ethernet services, including configuring MAC address table, link aggregation, VLANs, VLAN aggregation, MUX VLAN, VLAN termination, 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 also need to support VBST.

Licensing Requirements

VBST is a basic feature of a switch and is not under license control.

Version Requirements

Table 15-3  Products and versions supporting VBST

Product

Product Model

Software Version

S2700

S2700SI

Not supported

S2700EI

Not supported

S2710SI

Not supported

S2720EI

V200R006C10, V200R009C00, V200R010C00, V200R011C10, V200R012C00

S2750EI

V200R005C00SPC300, V200R006C00, V200R007C00, V200R008C00, V200R009C00, V200R010C00, V200R011C00, V200R011C10, V200R012C00

S3700

S3700SI

Not supported

S3700EI

Not supported

S3700HI

Not supported

S5700

S5700LI, S5700S-LI

V200R005C00SPC300, V200R006C00, V200R007C00, V200R008C00, V200R009C00, V200R010C00, V200R011C00, V200R011C10, V200R012C00

S5710-C-LI

Not supported

S5710-X-LI

V200R008C00, V200R009C00, V200R010C00, V200R011C00, V200R011C10, V200R012C00

S5700SI

V200R005C00

S5700EI

V200R005(C00&C01&C02&C03)

S5710EI

V200R005(C00&C02)

S5720EI

V200R007C00, V200R008C00, V200R009C00, V200R010C00, V200R011C00, V200R011C10, V200R012C00

S5720LI, S5720S-LI

V200R010C00, V200R011C00, V200R011C10, V200R012(C00&C20)

S5720SI, S5720S-SI

V200R008C00, V200R009C00, V200R010C00, V200R011C00, V200R011C10, V200R012C00

S5720I-SI

V200R012C00

S5700HI

V200R005(C00SPC500&C01&C02)

S5710HI

V200R005(C00&C02&C03)

S5720HI

V200R006C00, V200R007(C00&C10), V200R008C00, V200R009C00, V200R010C00, V200R011C00, V200R011C10, V200R012C00

S5730HI

V200R012C00

S5730SI

V200R011C10, V200R012C00

S5730S-EI

V200R011C10, V200R012C00

S6700

S6700EI

V200R005(C00&C01&C02)

S6720EI

V200R008C00, V200R009C00, V200R010C00, V200R011C00, V200R011C10, V200R012C00

S6720S-EI

V200R009C00, V200R010C00, V200R011C00, V200R011C10, V200R012C00

S6720LI, S6720S-LI

V200R011C00, V200R011C10, V200R012C00

S6720SI, S6720S-SI

V200R011C00, V200R011C10, V200R012C00

S6720HI

V200R012C00

NOTE:

For details about software mappings, visit Hardware Query Tool and search for the desired product model.

For feature support of S1700 series switches, see S1700 Series Enterprise Switches - Specifications.

Feature Limitations

  • Table 15-4 describes the specifications of VBST.
    Table 15-4  Specifications of VBST
    Item Specification

    Number of protected VLANs

    128

    PV number (The PV number is the total number of VLANs into which all VBST-enabled interfaces are added. The VLANs have been established and VBST has been enabled in the VLANs.)

    • In V200R009 and earlier versions, the S5720HI, S6720EI, and S6720S-EI support a maximum of 1200 PVs, the S5720EI supports a maximum of 600 PVs, and other switches support a maximum of 300 PVs.
    • In V200R010 and V200R011, the S5720HI, S6720EI, and S6720S-EI support a maximum of 1200 PVs, the S5730SI, S5730S-EI, S6720LI, S6720S-LI, S6720SI, S6720S-SI, and S5720EI support a maximum of 1000 PVs, the S2750EI, and S5700LI support a maximum of 300 PVs, and other switches support a maximum of 600 PVs.
    • In V200R012 and later versions, you can run the display vbst port-vlan statistics command to check the supported PV number.
    • The maximum PV number supported in a stack system is the sum of PV quantities supported by member switches. However, a stack system composed of the S5720EI supports a maximum of 2400 PVs.
    • For an Eth-Trunk, the number of PVs supported by the system is the number of PVs supported by the master switch.
    NOTICE:
    The CPU usage of VBST is in direct proportion to the PV number. If the number of occupied PVs exceeds the specifications, the CPU usage may be high. As a result, the switch cannot process tasks in a timely manner, protocol calculation is affected, and the switch cannot be managed by the NMS.
  • When VBST is enabled on a ring network, VBST immediately starts spanning tree calculation. Parameters such as the switch priority and port priority affect spanning tree calculation, and change of 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.

  • If the protected instance has been configured in a SEP segment or ERPS ring but the mapping between protected instances and VLANs is not configured, VBST cannot be enabled.

  • VBST cannot be enabled in the ignored VLAN or control VLAN used by ERPS, RRPP, SEP, or Smart Link.

  • If 1:N (N>1) mapping between MSTIs and VLANs has been configured on the switch, delete the mapping before changing the STP working mode to VBST.
  • If the stp vpls-subinterface enable command has been configured on a switch, run the undo stp vpls-subinterface enable command on an interface before changing the STP working mode to VBST.
  • If the device has been configured as the root bridge or secondary root bridge, run the undo stp vlan { vlan-id1 [ to vlan-id2 ] } &<1-10> root command to disable the root bridge or secondary root bridge function and run the stp vlan { vlan-id1 [ to vlan-id2 ] } &<1-10> priority priority command to change the device priority.

  • When more than 128 MSTIs are dynamically specified, STP is displayed as disabled in a created VLAN in the configuration file, for example, stp vlan 100 disable.

  • 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, no ports on the switch send BPDUs or negotiate the VBST status with directly connected ports on the remote device. All ports are in forwarding state. 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. Exercise caution when you configure a port as an edge port and BPDU filter port.

  • Root protection takes effect only on designated ports.

  • If a switch has an alternate port (backup of the root port), configure loop protection on both the root port and alternate port.

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Updated: 2018-12-24

Document ID: EDOC1100038339

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