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Configuration Guide - Reliability

S1720, S2700, S5700, and S6720 V200R010C00

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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Basic Concepts of VRRP

Basic Concepts of VRRP

As shown in Figure 4-1, HostA is dual-homed to SwitchA and SwitchB through the switch. SwitchA and SwitchB constitute a VRRP group to implement link redundancy.

Figure 4-1  VRRP group

As shown in Figure 4-1, VRRP involves the following entities:

  • VRRP router: device running VRRP. It may join one or more virtual routers. SwitchA and SwitchB 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. SwitchA and SwitchB constitute a virtual router.

  • Virtual router master: VRRP device that forwards packets. SwitchA 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. SwitchB is the virtual router backup.

  • VRID: virtual router ID. The VRID of the virtual router composed of SwitchA and SwitchB 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 SwitchA and SwitchB is

  • 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 SwitchA and the IP address of the virtual router are both, so SwitchA 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 SwitchA and SwitchB is 1, so the MAC address of the VRRP group is 00-00-5E-00-01-01.

Updated: 2019-08-21

Document ID: EDOC1000141941

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