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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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Using VRRP to Implement Next-Hop Gateway Backup

Using VRRP to Implement Next-Hop Gateway Backup

Users connect to the upper-layer network through the gateway. To ensure nonstop service transmission, configure VRRP active/standby on the gateway to implement next-hop gateway backup.

Figure 3-10  Using VRRP to implement next-hop gateway backup

As shown in Figure 3-10, SwitchA is the master and forwards service packets. SwitchB and SwitchC are backups and do not forward services. If SwitchA is faulty, a new master is selected from SwitchB and SwitchC based on their priorities. The new master then takes over traffic.

You can configure VRRP to monitor the uplink status and association between VRRP and BFD to enhance the VRRP active/standby function.
  • To detect the faults on the uplink, configure VRRP to monitor the uplink status. When the uplink interface or uplink fails, the priority of the master is reduced. This triggers an active/standby switchover and ensures proper traffic forwarding.
  • To speed up the active/standby switchover in the VRRP group, configure a BFD session between the master and backup and associate the BFD session with the VRRP group. This is because BFD can fast detect faults. When the link between the master and backup becomes Down, the backup immediately switches to the master and takes over traffic.
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Updated: 2019-10-18

N. documento: EDOC1000178318

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