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Configuration Guide - Reliability

S7700 and S9700 V200R011C10

This document describes the configuration of BFD, DLDP, VRRP, SmartLink, CFM, EFM, Y.1731 and MAC swap loopback to ensure reliability on the device.
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(Optional) Configuring VRRP IPv6 Advertisement Packet Attributes

(Optional) Configuring VRRP IPv6 Advertisement Packet Attributes

Context

VRRP IPv6 Advertisement packets are used to advertise the master router's priority value and status to other VRRP IPv6 routers in a VRRP IPv6 backup group. Sending the VRRP IPv6 Advertisement packets helps implement status transition and master election. VRRP IPv6 packets have the following attributes:

  • VRRP IPv6 TTL detection: A VRRP-enabled device checks the TTL in every received VRRP IPv6 Advertisement packet and discards the packets if the TTLs are not 255. On a network with Huawei and non-Huawei devices, this function needs to be disabled to prevent packet loss.

  • Sending ND packets carrying only the minimal inner VLAN ID: A QinQ termination sub-interface sends ND packets with two tags and the inner tag is a range of VLAN IDs. To ensure that switches connected to users learn the correct MAC address of the VRRP backup group, the VRRP backup group on the QinQ termination sub-interface sends ND packets to all VLANs identified by inner VLAN IDs. This increases the burden on the VRRP-enabled device. To release the burden, the VRRP-enabled device can be configured to send ND packets carrying only the minimal inner VLAN ID.

Procedure

  • Disable VRRP IPv6 TTL check.
    1. Run system-view

      The system view is displayed.

    2. Run interface interface-type interface-number

      The interface view is displayed.

    3. (Optional) On an Ethernet interface, run undo portswitch

      The interface is switched to Layer 3 mode.

      By default, an Ethernet interface works in Layer 2 mode.

    4. Run vrrp6 un-check hop-limit

      The device is configured not to check the TTL value in VRRP IPv6 Advertisement packets.

      By default, the system checks the TTL value in VRRP IPv6 Advertisement packets.

    5. Run quit

      The system view is displayed.

  • Configure the VRRP-enabled device to send ND packets carrying only the minimal inner VLAN ID.
    1. Run interface interface-type interface-number.subinterface-number

      The view of an Ethernet sub-interface or Eth-Trunk sub-interface that is configured with QinQ VLAN tag termination is displayed.

    2. Run vrrp6 nd send-mode simple

      The QinQ termination sub-interface in the Master state is configured to send ND packets carrying the outer VLAN ID and the minimal inner VLAN ID.

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Updated: 2019-10-18

N. documento: EDOC1000178318

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