HSB function

jason_hu · Created Aug 26, 2021 06:15:47

Hi friend!

Hot-standby backup (HSB) is a feature that improves network reliability through redundancy between two devices. After the two devices determine the master and backup roles, the master device forwards service packets, and the backup device monitors status of the master device. The master device periodically sends its status information and data to be backed up to the backup device. When the master device fails, the backup device takes over the services immediately.

As users impose higher requirements on network reliability, nonstop transmission has become a key issue, especially on ingress nodes or access nodes of important services, such as Internet access nodes of enterprises and database servers of banks. If only one device is deployed on such a service point, the network is vulnerable to service interruption caused by single-point failures, even if the device is highly reliable.

HSB was introduced to solve this problem. HSB implements service backup between two devices. Service information is backed up in real-time through the HSB channel so that the backup device can take over services without causing service interruption when the master device fails. This technology reduces the risks of single-point failures and improves network reliability.

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 the link status of the HSB channel. Session information is synchronized through the HSB channel.

VRRP HSB implements traffic switching through VRRP. You can refer to the link https://support.huawei.com/hedex/hdx.do?docid=EDOC1100203017&id=EN-US_CONCEPT_0176375977&lang=en

Hope to help you!

stephen.xu · Created Aug 26, 2021 04:52:57

Hi, dear

Please kindly wait for a minute.

Unicef · Created Aug 26, 2021 05:24:58

Dear Friend!

The AR supports the HSB function. 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. The principle for data synchronization is to establish active and standby channels between devices that back up each other. Session entries of the master device can be synchronized to the backup device through the channel at one time, in real time, or periodically. The principle for traffic switching is based on negotiation between the master device and the backup device using VRRP. When the master device fails, a new master device is elected based on VRRP priorities and the traffic is switched to the master device.

Thanks!

DDSN · Created Aug 26, 2021 06:10:07

Hi S_Noch,
In hot-standby backup mode, after two devices determine the master and backup devices, the master device forwards services and the backup device is in the monitoring state. In addition, the active device sends status information and information to be backed up to the standby device in real-time. When the active device fails, the standby device takes over services from the active device in a timely manner.
Simply put, HSB includes data synchronization and traffic switching.
Data synchronization is normal data synchronization to ensure that information on the active and standby devices is consistent.
When a fault occurs or is rectified, traffic is switched to the backup device to ensure service continuity.
HSB is usually used together with VRRP. HSB implements traffic switching through VRRP. The HSB master/backup device selection is the same as the VRRP master/backup device selection. The master device negotiated by the VRPP group is the master device of the HSB, and the backup device of the VRRP group is the backup device of the HSB. When a fault occurs, the VRRP group selects a new master device based on the VRRP priority to forward traffic.

jason_hu · Created Aug 26, 2021 06:15:47

Hi friend!

Hot-standby backup (HSB) is a feature that improves network reliability through redundancy between two devices. After the two devices determine the master and backup roles, the master device forwards service packets, and the backup device monitors status of the master device. The master device periodically sends its status information and data to be backed up to the backup device. When the master device fails, the backup device takes over the services immediately.

As users impose higher requirements on network reliability, nonstop transmission has become a key issue, especially on ingress nodes or access nodes of important services, such as Internet access nodes of enterprises and database servers of banks. If only one device is deployed on such a service point, the network is vulnerable to service interruption caused by single-point failures, even if the device is highly reliable.

HSB was introduced to solve this problem. HSB implements service backup between two devices. Service information is backed up in real-time through the HSB channel so that the backup device can take over services without causing service interruption when the master device fails. This technology reduces the risks of single-point failures and improves network reliability.

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 the link status of the HSB channel. Session information is synchronized through the HSB channel.

VRRP HSB implements traffic switching through VRRP. You can refer to the link https://support.huawei.com/hedex/hdx.do?docid=EDOC1100203017&id=EN-US_CONCEPT_0176375977&lang=en

Hope to help you!

HSB function

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HSB function

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