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NE40E-M2 V800R010C10SPC500 Feature Description - User Access 01

This is NE40E-M2 V800R010C10SPC500 Feature Description - User Access
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Dual-Device BRAS virtual-access hot backup

Dual-Device BRAS virtual-access hot backup

Networking Description

In single-device virtual access scenarios, all BRAS users access a network through a master. If the master or the direct link to the master fails, all BRAS users' services are interrupted and the service recovery time is uncertain, which seriously affects BRAS user experience and carriers' benefits. Dual-device hot backup for BRAS virtual access enables BRAS user information on the primary master to be backed up to the secondary master in real time. If the primary master or the direct link to the primary master fails, BRAS users do not need to go online again and their services are switched to the secondary master. After the fault is rectified, the BRAS users' services are switched back to the primary master, which improves network reliability. The BRAS users are not aware of the fault during the preceding process.

NOTE:

The primary and secondary masters negotiate the primary/secondary relationship through a virtual access inter-chassis protocol (for example, the Diameter protocol), and support Virtual Access Solution - Reliability.

Figure 9-20 describes a typical networking environment with dual-device hot backup for BRAS virtual access deployed. Device A and Device B are the primary and secondary masters, respectively. In normal circumstances, Device A forwards both upstream and downstream traffic. The secondary master synchronizes BRAS user information from the primary master. If Device A or the link between Device A and the AP fails, a primary/secondary switchover is performed and Device B becomes the primary master. Device B needs to advertise a network segment route to network-side devices so that the devices will transmit downstream traffic to Device B. Device B forwards traffic directly based on the backup user information, and users do not need to go online again.

Figure 9-20 Dual-device hot backup for BRAS virtual access
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Updated: 2019-01-02

Document ID: EDOC1100058415

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