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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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VRRP Active/Standby

VRRP Active/Standby

Active/Standby is the basic VRRP working mode, as shown in Figure 3-4. In active/standby mode, a virtual router consists of one master and multiple backups.

SwitchA is the master and forwards service packets. SwitchB and SwitchC are backups and do not forward services. SwitchA periodically sends VRRP Advertisement packets to SwitchB and SwitchC, notifying them that the master is working properly. If SwitchA is faulty, a new master is selected from SwitchB and SwitchC based on their priorities. The new master then takes over traffic forwarding.

After SwitchA recovers, it becomes the master in preemption mode or remains in Backup state in non-preemption mode.

Figure 3-4  VRRP active/standby

On the network shown in Figure 3-4:

  • SwitchA is the master, with the priority 120. It uses the delayed preemption mode.
  • SwitchB is the backup, with the priority 100. It uses the immediate preemption mode.
  • SwitchC is the backup, with the priority 110. It uses the immediate preemption mode.
  1. When SwitchA is running properly, traffic sent from users is transmitted along the path Switch -> SwitchA -> Router. SwitchA periodically sends VRRP Advertisement packets to SwitchB and SwitchC, notifying them that the master is working properly.

  2. When a fault occurs on SwitchA, VRRP does not function on SwitchA. Because SwitchC has a higher priority than SwitchB, SwitchC becomes the master. SwitchC starts to send VRRP Advertisement packets and gratuitous ARP packets, whereas SwitchB remains in Backup state. User traffic is transmitted along the path Switch -> SwitchC -> Router.

  3. When SwitchA recovers, its priority is restored to 120 and it enters the Backup state. SwitchC continues sending VRRP Advertisement packets. When SwitchA receives a VRRP Advertisement packet, it compares the priority in the packet with its own priority and detects that its priority is higher. After the preemption delay, SwitchA becomes the master and starts to send VRRP Advertisement packets and gratuitous ARP packets. User traffic is again transmitted along the path Switch -> SwitchA -> Router.

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Updated: 2019-10-18

N. documento: EDOC1000178318

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