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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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Configuring the Maximum Number of Connections in an Eth-Trunk that Affects Spanning Tree Calculation

Configuring the Maximum Number of Connections in an Eth-Trunk that Affects Spanning Tree Calculation

Context

Path costs are a major factor in spanning tree calculation and changing path costs triggers spanning tree recalculation. The path cost of an interface is affected by its bandwidth, so you can change the interface bandwidth to affect spanning tree calculation.

In Figure 9-15, SwitchA and SwitchB are connected through two Eth-Trunk links. Eth-Trunk 1 has three member interfaces in Up state and Eth-Trunk 2 has two member interfaces in Up state. Each member link has the same bandwidth, and SwitchA is selected as the root bridge.
  • Eth-Trunk 1 has higher bandwidth than Eth-Trunk 2. After STP calculation, Eth-Trunk 1 on SwitchB is selected as the root port and Eth-Trunk 2 is selected as the alternate port.
  • If the maximum number of connections affecting bandwidth of Eth-Trunk 1 is set to 1, the path cost of Eth-Trunk 1 is larger than the path cost of Eth-Trunk 2. Therefore, after the two devices perform spanning tree recalculation, Eth-Trunk 1 on SwitchB becomes the alternate port and Eth-Trunk 2 becomes the root port.
Figure 9-15 Configuring the maximum number of connections in an Eth-Trunk

The maximum number of connections affects only the path cost of an Eth-Trunk interface participating in spanning tree calculation, and does not affect the actual bandwidth of the Eth-Trunk link. The actual bandwidth for an Eth-Trunk link depends on the number of active member interfaces in the Eth-Trunk.

Procedure

  1. Run system-view

    The system view is displayed.

  2. Run interface eth-trunk trunk-id

    The Eth-Trunk interface view is displayed.

  3. Run max bandwidth-affected-linknumber link-number

    The maximum number of connections affecting the Eth-Trunk bandwidth is set.

    By default, the upper threshold for the number of interfaces that determine the bandwidth of an Eth-Trunk is 8 on the CE5810EI, 64 on the CE6880EI, and 16 on other models (excluding the CE6870EI and CE6875EI). For the CE6870EI and CE6875EI, the upper threshold for the number of interfaces that determine the bandwidth of an Eth-Trunk depends on the maximum number of configured LAGs. In an SVF system, the maximum number of connections affecting the bandwidth of an Eth-Trunk is 8.

  4. Run commit

    The configuration is committed.

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Updated: 2019-05-08

Document ID: EDOC1100004351

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