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CLI-based Configuration Guide - Reliability

AR100-S, AR110-S, AR120-S, AR150-S, AR160-S, AR200-S, AR1200-S, AR2200-S, and AR3200-S V200R009

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HSB Implementation

HSB Implementation

HSB implementation involves data synchronization and traffic switching. Data synchronization is performed to ensure consistent information on the master and backup devices when the two devices are working normally. Traffic switching is performed to ensure non-stop service forwarding when the master device fails or recovers.

Data Synchronization

When the master device fails, service traffic can be switched to the backup device only if the backup device has the same session entries as the master device. If the session entries on the master and backup devices are different, sessions may be interrupted during traffic switching. Therefore, a mechanism is required to synchronize session information to the backup device when session entries are created or modified on the master device. The HSB service module provides data backup, sets up an HSB channel between the master and backup devices and maintains link status of the HSB channel. Session information is synchronized through the HSB channel.

The device provides the following data synchronization modes:
  • Batch backup

    During operation, the master device may save a large number of session entries. After a backup device is added to the network and HSB is configured on the two devices, the master device synchronizes all the session entries to the backup device at one time. This is a batch backup process.

  • Real-time backup

    When the master device generates new session entries or modifies existing session entries, it synchronizes new or modified session entries to the backup device in real time. This is a real-time backup process.

  • Periodic backup

    To ensure that entries on the master and backup devices are consistent, the backup device checks whether session entries are the same as those on the master device every 30 minutes. If session entries are inconsistent, the session entries on the master device are updated to the backup device. This is a periodic backup process.

Traffic Switching

VRRP HSB implements traffic switching through VRRP.

As shown in Figure 5-3, VRRP is configured on RouterA and RouterB. In the VRRP group, RouterA is the master device and RouterB is the backup device. For details about VRRP, see Principles. According to the VRRP status of the two routers, RouterA becomes the master device in the HSB group, and RouterB becomes the backup device. The HSB service synchronizes session information from RouterA to RouterB.

Figure 5-3  Traffic switching through VRRP (before switching)

When RouterA fails, as shown in Figure 5-4, the VRRP group selects a new master based on the VRRP priorities of the devices. RouterB then becomes the master device, and service traffic is switched to RouterB.

Figure 5-4  Traffic switching through VRRP (after switching)
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Updated: 2019-05-17

Document ID: EDOC1000174116

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