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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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VRRP in Load Balancing Mode

VRRP in Load Balancing Mode

In load balancing mode, multiple VRRP groups transmit service traffic simultaneously, as shown in Figure 3-5. The implementation of and packet negotiation in load balancing mode are similar to those in active/standby mode. Each VRRP group has one master and multiple backups. In load balancing mode, multiple VRRP groups need to be set up, each with a different master. A VRRP device can join multiple VRRP groups and have different priorities in different VRRP groups.

There are two types of VRRP load balancing: multi-gateway load balancing and single-gateway load balancing.

Multi-Gateway Load Balancing

In multi-gateway load balancing, multiple VRRP groups with virtual IP addresses are created and specified as gateways for different users to implement load balancing.

Figure 3-5 Multi-gateway load balancing
In Figure 3-5, two VRRP groups are configured:
  • VRRP group 1: SwitchA functions as the master and SwitchB as the backup.
  • VRRP group 2: SwitchB functions as the master and SwitchA as the backup.

VRRP groups 1 and 2 are gateways for different user hosts. Multiple VRRP groups load balance traffic and back each other up.

Single-Gateway Load Balancing

In single-gateway load balancing, a Load-Balance Redundancy Group (LBRG) with a virtual IP address is created, and VRRP groups without virtual IP addresses are added to the LBRG. The LBRG is specified as a gateway for all users to implement load balancing.

Figure 3-6 Single-gateway load balancing
In Figure 3-6, two VRRP groups are configured:
  • VRRP group 1: an LBRG. SwitchA is the master, and SwitchB is the backup.
  • VRRP group 2: an LBRG member group. SwitchB is the master, and SwitchA is the backup.

All user hosts use VRRP group 1 as a gateway. After VRRP group 1 receives an ARP request packet from a user host, VRRP group 1 encapsulates its own virtual MAC address or VRRP group 2's virtual MAC address into an ARP reply packet for the ARP request packet. Single-gateway load balancing is an upgrade of multi-gateway load balancing. As such, single-gateway load balancing simplifies user-side configurations and facilitates network maintenance and management.

Updated: 2019-05-08

Document ID: EDOC1100004359

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