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NE20E-S2 V800R010C10SPC500 Feature Description - Network Reliability 01

This is NE20E-S2 V800R010C10SPC500 Feature Description - Network Reliability
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Overview of Dual-Device Backup

Overview of Dual-Device Backup

Definition

Dual-device backup is a feature that ensures service traffic continuity in scenarios in which a master/backup status negotiation protocol (for example, VRRP or E-Trunk) is deployed. Dual-device backup enables the master device to back up service control data to the backup device in real time. When the master device or the link directly connected to the master device fails, service traffic quickly switches to the backup device. When the master device or the link directly connected to the master device recovers, service traffic switches back to the master device. Therefore, dual-device backup improves service and network reliability.

Related Concepts

If VRRP is used as a master/backup status negotiation protocol, dual-device backup involves the following concepts:
  • VRRP

    VRRP is a fault-tolerant protocol that groups several routers into a virtual router. If the next hop of a host is faulty, VRRP switches traffic to another router, which ensures communication continuity and reliability.

    For details about VRRP, see the chapter "VRRP" in NE20E Feature Description - Network Reliability.

  • RUI

    RUI is a Huawei-specific redundancy protocol that is used to back up user information between devices. RUI, which is carried over the Transmission Control Protocol (TCP), specifies which user information can be transmitted between devices and the format and amount of user information to be transmitted.

  • RBS

    The remote backup service (RBS) is an RUI module used for inter-device backup. A service module uses the RBS to synchronize service control data from the master device to the backup device. When a master/backup VRRP switchover occurs, service traffic quickly switches to a new master device.

  • RBP

    The remote backup profile (RBP) is a configuration template that provides a unified user interface for dual-device backup configurations.

If E-Trunk is used as a master/backup status negotiation protocol, dual-device backup involves the following concept:
  • E-Trunk

    E-Trunk implements inter-device link aggregation, providing device-level reliability. E-Trunk aggregates data links of multiple devices to form a link aggregation group (LAG). If a link or device fails, services are automatically switched to the other available links or devices in the E-Trunk, improving link and device-level reliability.

    For details about E-Trunk, see "E-Trunk" in NE20E Feature Description - LAN Access and MAN Access.

Purpose

In traditional service scenarios, all users use a single device to access a network. Once the device or the link directly connected to the device fails, all user services are interrupted, and the service recovery time is uncertain. To resolve this issue, deploy dual-device backup to enable the master device to back up service control data to the backup device in real time.

  • The NE20E supports only dual-device hot backup for Address Resolution Protocol (ARP) services, also called dual-device ARP hot backup.

    Dual-device ARP hot backup enables the master device to back up the ARP entries at the control and forwarding layers to the backup device in real time. When the backup device switches to a master device, it uses the backup ARP entries to generate host routing information without needing to relearn ARP entries, ensuring downlink traffic continuity.
    • Manually triggered dual-device ARP hot backup: You must manually establish a backup platform and backup channel for the master and backup devices. In addition, you must manually trigger ARP entry backup from the master device to the backup device. This backup mode has complex configurations.
    • Automatically enabled dual-device ARP hot backup: You need to establish only a backup channel between the master and backup devices, and the system automatically implements ARP entry backup. This backup mode has simple configurations.
  • Dual-device IGMP snooping hot backup enables the master device to back up IGMP snooping entries to the backup device in a master/backup E-Trunk scenario. If the master device or the link between the master device and user fails, the backup device switches to a master device and takes over, ensuring multicast service continuity.

Benefits

  • Benefits to users

    • Improved user experience
  • Benefits to operators

    Improving network reliability from the perspective of service reliability.

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Updated: 2019-01-02

Document ID: EDOC1100055473

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