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CLI-based Configuration Guide - Reliability

AR100, AR120, AR150, AR160, AR200, AR1200, AR2200, AR3200, and AR3600 V200R010

This document provides guidance for configuring reliability services, including interface backup, BFD, VRRP, and EFM.
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Basic Concepts of VRRP

Basic Concepts of VRRP

As shown in Figure 7-1, HostA is dual-homed to RouterA and RouterB through the switch. RouterA and RouterB constitute a VRRP group to implement link redundancy.

Figure 7-1  VRRP group

As shown in Figure 7-1, VRRP involves the following entities:

  • VRRP router: device running VRRP. It may join one or more virtual routers. RouterA and RouterB are VRRP routers.

  • Virtual router: VRRP group consisting of one master and multiple backups. The VRRP group's virtual IP address is used as the default gateway address on a LAN. RouterA and RouterB constitute a virtual router.

  • Virtual router master: VRRP device that forwards packets. RouterA is the virtual router master.

  • Virtual router backup: a group of VRRP devices that do not forward packets. When the master is faulty, a backup with the highest priority becomes the master. RouterB is the virtual router backup.

  • VRID: virtual router ID. The VRID of the virtual router composed of RouterA and RouterB is 1.

  • Virtual IP address: IP address of a virtual router. A virtual router can be assigned one or more virtual IP addresses. Virtual IP addresses are configurable. The virtual IP address of the virtual router composed of RouterA and RouterB is 10.1.1.10/24.

  • IP address owner: VRRP device that uses an IP address of a virtual router as the actual interface address. If an IP address owner is available, it usually functions as the virtual router master. The interface address of RouterA and the IP address of the virtual router are both 10.1.1.10/24, so RouterA is the IP address owner.

  • Virtual MAC address: MAC address that is generated by the virtual router based on the VRID. A virtual router has one virtual MAC address and is in the format of 00-00-5E-00-01-{VRID} (VRRP for IPv4) or 00-00-5E-00-02-{VRID} (VRRP for IPv6). The virtual router sends ARP Reply packets carrying the virtual MAC address but not the interface MAC address. The VRID of the virtual router composed of RouterA and RouterB is 1, so the MAC address of the VRRP group is 00-00-5E-00-01-01.

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Updated: 2019-08-12

Document ID: EDOC1100034076

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