H3C XE 200 IP, Operation Manual

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Operation Manual – Feature
H3C XE 200/2000 IP PBX
Chapter 2 Backup and Load Sharing
2-2
and so on. In this way, the failure of one LS will not cause the VoIP network to break
down.
The XE IP PBX supports the LS-BACK backup policy. Namely, if the PS is not using the
LS with the highest priority, the PS will check whether an LS with a higher priority is
available by polling the LSs. If a high-priority LS is available, the PS will establish a
connection with that LS and then end the connection with the low-priority LS. In the LS
backup model, if Process Server 1, which is LS-BACK policy enabled, is currently using
Location Server 3, of which the priority level is 3, Process Server 1 will check whether
Location Server 1 (priority 0) and Location Server 2 (priority 1) are available by polling
these LSs. If Location Server 2 is available, Process Server 1 will end the connection
with Location Server 3 and establish a connection with Location Server 2, while
continuing probing Location Server 1(priority 0) and attempting to establish a heartbeat
connection with it.
Perform the following configuration in the PS view.
Table 2-1 Enable/disable LS backup
Operation Command
Enable/disable LS backup ls-back { disable | enable }
By default, the LS backup is disabled.
2.1.2 Introduction to PS Backup
To implement PS backup, at least two PSs are deployed on the VoIP network. When
one PS becomes faulty, another PS will takeover the work of the faulty one to ensure
the proper operation of the VoIP network.
There two PS backup models:
z
PS-GROUP backup model
z
OFFICE-GROUP-PS backup model
I. Introduction to the PS-GROUP backup model
The following figure shows the PS-GROUP model.