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CloudEngine 8800, 7800, 6800, and 5800 V200R002C50 Configuration Guide - Virtualization

This document describes the configurations of virtualization, including stack and SVF.
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Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).
Stack Feature Limitations

Stack Feature Limitations

Stack Setup Precautions

When setting up a stack, pay attention to the following points:
  • Optical or copper modules that are certified for Huawei Ethernet switches must be used. If high-speed cables or AOC cables are used, you must purchase cables from Huawei.

    Optical or copper modules that are not certified for Huawei Ethernet switches or cables that are not purchased from Huawei cannot ensure transmission reliability and may affect service stability. Huawei is not liable for any problem caused by the use of optical or copper modules that are not certified for Huawei Ethernet switches, or cables not purchased from Huawei, and will not fix such problems.

  • When connecting stack members through stack cables, ensure that the stack members are directly connected.

  • It is recommended that you configure DAD for a stack to minimize the impact of a stack split on services.

  • After a stack is set up, you must run the save command to save the stack configuration.

  • When a stack is running stably, do not shut down stack ports and DAD-configured ports. Otherwise, the stack will split and service traffic cannot be forwarded.
  • To ensure high network reliability, it is recommended that a stack connect to upstream and downstream devices using an inter-device Eth-Trunk (dual-homing networking).

  • Before setting up a stack, you are advised to load the same software version and patch version on member switches.

  • It is recommended that you use two or more links to set up a stack. If only one link is used to set up a stack (this method is not recommended), it is recommended that you run the carrier down-hold-time interval command on stack member ports to configure the delay after which the port Down state is reported. This configuration prevents the stack from becoming unstable because of intermittent port disconnection.

  • Before the master and standby switches complete batch backup, do not shut down or remove stack links. Otherwise, the standby switch may restart.

    To check the batch backup status between the master and standby switches, run the display switchover state command.

  • To prevent stack packet forwarding from being affected, you are advised not to configure the flow-control command on stack member ports.

  • When traffic control is configured in a stack and traffic is forwarded between member switches in the stack, traffic control does not take effect because stack ports do not support the flow-control command.

  • If CE6851HI, CE6850-48T6Q-HI, CE6810-32T16S4Q-LI, and CE5855EI set up a stack using 40GE high-speed cables, member switches must be upgraded to the same version so that they can set up a stack. For example, a stack cannot be set up between switches running V100R005C10SPC100 and switches running V100R005C10SPC200 or later version.

    After a stack is set up, it cannot be upgraded from V100R005C10SPC100 to V100R005C10SPC200 or later version using the fast upgrade function.

  • In V100R006C00 or later versions, after service ports are configured as stack member ports, the port crc-statistics trigger error-down command is automatically configured on these member ports. After a version upgrade to V100R006C00 or later, the port crc-statistics trigger error-down command configuration is automatically added to these member ports.

    In versions earlier than V200R002C50, after stack member ports are restored as common service ports, the port crc-statistics trigger error-down command configuration is not automatically cleared.

    In V200R002C50 and later versions, if the port crc-statistics trigger error-down command is not configured before service ports are configured as stack member ports, this command configuration is automatically cleared after stack member ports are restored as common service ports. If this command has been configured before service ports are configured as stack member ports, this command configuration is not automatically cleared after stack member ports are restored as service ports.

  • When the protocol of a stack member port is Down, the port will not enter the Error-Down state due to CRC error packets.

  • On the CE6880EI and CE5880EI, only known unicast and multicast packet statistics on stack member ports are collected, and unknown unicast packet statistics are collected as multicast packet statistics.

  • When CE8868EIs set up a stack and a stack member has any licence item of CE88-LIC-25G, CE88-LIC-40G, and CE88-LIC-100G loaded, all other stack members must have the same license item loaded.

Stack Upgrade Precautions

When upgrading a stack, pay attention to the following points:
  • Do not remove or reinstall optical modules or power cycle the switch during a software upgrade.

  • Ensure network stability and do not perform other service configurations on the network during a software upgrade.

  • Only the stack containing two member switches supports fast upgrade.

  • During a fast stack upgrade, to shorten traffic interruptions, ensure that upstream and downstream devices are dual-homed to stacked switches using Eth-Trunk.

  • If 40GE high-speed cables are used to connect stack member switches, you cannot fast upgrade switches to V100R003C00 or a later version.

  • When 40GE QSFP+ AOC cables are used for stack connections, the stack cannot be upgraded using fast upgraded to V100R005C10 or a later version.

  • If QSFP28 optical modules or QSFP+/QSFP28 high-speed cables are used to set up a CE8850EI stack, this stack cannot be upgraded from V200R002C50 to V200R002C50SPC800 or later in fast stack mode.

  • You are advised to configure a backup IP address for the stack management interface before a fast upgrade. This configuration prevents a failure to manage member switches when the stack fails the fast upgrade and splits.

  • In versions earlier than V100R005C00, you can use some 10GE ports split from CE5850HI 40GE ports as service ports and some as stack member ports. In V100R005C00 and later versions, you must use all 10GE ports split from CE5850HI 40GE ports as stack member ports.

    A stack may fail to be set up if the following conditions are met:
    1. A CE5850HI uses some 10GE ports split from 40GE ports as stack member ports.
    2. Some 10GE service ports split from 40GE ports have the service configuration that conflicts with the stack during an upgrade to V100R005C00 or later.
    To solve this problem, you need to delete the service configuration that conflicts with the stack from the service ports.

Feature Support in a Stack

In a stack, support for most features except the following features is the same as support on a standalone switch. Table 1-4 shows the difference in support for some features.
Table 1-4 Feature support in a stack

Feature

Feature Support in a Stack

Port split

If a 100GE or 40GE optical port has been configured as a stack member port, it cannot be split.

Layer 2 port isolation

Inter-chassis Layer 2 port isolation in a stack is supported since V100R003C10.

USB-based deployment

USB-based deployment is not supported in a stack.

PFC

A stack set up in a ring topology does not support the PFC function.

MPLS

MPLS is not supported in a stack.

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Updated: 2019-04-20

Document ID: EDOC1000166645

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