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Configuration Guide - Reliability

CloudEngine 8800, 7800, 6800, and 5800 V200R003C00

This document describes the configurations of Reliability, including BFD Configuration, VRRP Configuration, DLDP Configuration, Smart Link and Monitor Link Configuration, EFM Configuration, and CFM Configuration.
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Configuring Switches to Send and Receive Flush Packets

Configuring Switches to Send and Receive Flush Packets

Context

When link switching occurs in a Smart Link group, existing forwarding entries no longer apply to the new topology. MAC address entries and ARP entries on the entire network need to be updated. Therefore, the Smart Link group needs to send Flush packets to notify other devices so that the other devices can update their MAC address entries and ARP entries. Because manufacturers define different Flush packet formats, the Flush packets described here are only used for intercommunication between Huawei switches, and the remote device must be configured to receive Flush packets.

An interface can receive Flush packets only when the control VLAN ID is configured on the interface and the interface is added to the control VLAN.

You do not need to configure all interfaces on a switch to receive Flush packets from the specified control VLAN. This function only needs to be configured on interfaces on the primary and backup links connected to the destination device.

Configure the Smart Link authentication mode and set a password on directly connected devices. Simple, SHA, and HMAC SHA256 authentication modes are supported. The recommended authentication mode is HMAC SHA256, an irreversible algorithm.

In Figure 5-15, Smart Link is configured on SwitchA. Interface3 and Interface4 of SwitchB, Interface5 and Interface6 of SwitchC, and Interface7 and Interface8 of SwitchD need to be configured to receive Flush packets.

Figure 5-15 Interfaces that need to receive Flush packets
NOTE:

If interfaces are not configured to send and receive Flush packets, a Smart Link group uses the aging mechanism to update MAC address entries and ARP entries, causing slow convergence. It is recommended that you enable interfaces to send and receive Flush packets when configuring a Smart Link group, which speeds up network convergence.

Procedure

  • Enabling the Smart Link group on SwitchA to send Flush packets

    1. Run system-view

      The system view is displayed.

    2. Run smart-link group group-id

      The Smart Link group view is displayed.

    3. Run flush send control-vlan vlan-id [ password { simple | sha | hmac-sha256 } password ]

      The Smart Link group is enabled to send Flush packets, and the encryption mode, control VLAN ID, and password in Flush packets are set. The VLAN ID specified by vlan-id must already exist on the switch. If the specified VLAN ID does not exist, Flush packets cannot be sent.

      The encryption mode, control VLAN ID, and password configured for Flush packets sent by a switch must be the same as those configured for receiving Flush packets on the remote device.

      NOTE:
      • This command does not add member interfaces of the Smart Link group to the control VLAN. You must configure the member interfaces to allow packets of the control VLAN to pass through.

      • SHA or HMAC-SHA256 authentication provides higher security than simple authentication.

    4. Run commit

      The configuration is committed.

  • Enabling Flush packet receiving on interfaces on active and standby links of SwitchB, SwitchC, and SwitchD

    1. Run system-view

      The system view is displayed.

    2. Run interface interface-type interface-number

      The interface view is displayed.

    3. Run smart-link flush receive control-vlan vlan-id [ password { simple | sha | hmac-sha256 } password ]

      The interface is enabled to receive Flush packets, and the encryption mode, control VLAN ID, and password in received Flush packets are set.

      The password is optional. If you do not specify a password, no password is used for authentication. If the control VLAN ID is changed, the password must be reconfigured.

      The encryption mode, control VLAN ID, and password configured on the device that sends Flush packets must be the same as those configured on the device that receives Flush packets.

      NOTE:

      SHA or HMAC-SHA256 authentication provides higher security than simple authentication.

    4. Run commit

      The configuration is committed.

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Updated: 2019-05-08

Document ID: EDOC1100004359

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