H3C XE 200 IP, Руководство по эксплуатации

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Operation Manual – Feature
H3C XE 200/2000 IP PBX
Chapter 2 Backup and Load Sharing
2-1
Chapter 2 Backup and Load Sharing
2.1 Backup
In a large VoIP network, multiple PSs and LSs can be deployed to prevent voice service
failures caused by breakdown of an XE IP PBX. The backup feature provided by XE
server ensures the proper and stable operation of the VoIP network. The backup
functionality provided by an XE server includes two parts: PS backup and LS backup.
2.1.1 Introduction to LS Backup
To implement the LS backup function, at least two LSs are deployed on the VoIP
network, the priority level of each LS is configured on the PS. When the LS being used
by the PS becomes faulty, the PS will select another LS that it available based on the
backup policy to ensure the proper operation of the VoIP network.
The following figure shows the LS backup model.
Figure 2-1 LS backup model
In the LS backup model, three LSs (Location Server 1, Location Server 2 and Location
Server 3) and one PS (Process Server 1) are deployed on the VoIP network. Process
Server 1 is configured to use Location Server 1, Location Server 2, and Location Server
3, of which the priority levels are 0, 1, and 2 respectively. The smaller the priority value
is, the higher the priority is. Under normal conditions, Process Server 1 uses Location
Server 1, which has the highest priority. If Location Server 1 fails, Process Server 1 will
choose Location Server 2 a certain period (usually 3 minutes) after the failure, which
has a priority next to Location Server 1, and establish a connection with Location
Server 2. If Location Server 2 fails, the PS will choose an LS with a priority next to it,