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Configuration Guide - Reliability

S2720, S5700, and S6720 V200R013C00

This document describes the configurations of Reliability, including BFD Configuration, VRRP Configuration, DLDP Configuration, Smart Link and Monitor Link Configuration, MAC Swap Loopback Configuration, EFM Configuration, CFM Configuration, Y.1731 Configuration.

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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 traffic. SwitchB and SwitchC are backups and do not forward traffic. If SwitchA is faulty, either SwitchB or SwitchC is selected as the new master, depending on their priorities. The new master then takes over traffic forwarding.

Depending on your network requirements, either configure VRRP or associate BFD with VRRP:
  • If you need 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.
  • If you need 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 quickly detect faults. When the link between the master and backup becomes Down, the backup immediately switches to the master and takes over traffic.
Updated: 2019-04-04

Document ID: EDOC1100065682

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