H3C XE 200/2000 IP, Руководство по эксплуатации

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Operation Manual – Feature
H3C XE 200/2000 IP PBX
Chapter 3 Overload Protection
3-1
Chapter 3 Overload Protection
3.1 Introduction to Overload Protection
In a large VoIP network constructed using the XE 200/2000, an XE IP PBX can be
overloaded as the result of an unreasonable load sharing policy, burst call requests,
and/or excessive concurrent registration requests. To avoid decreased performance of
the XE IP PBX and ensure the operation of the VoIP network, overload protection is
provided.
3.2 Overload Protection Mechanism
The idea of overload protection is to decrease the load of a PS by dropping call
requests according to the specified call reject policy when the PS detects that it is
overloaded.
For SIP calls, the system drops INVITE messages and sends back responses in the
range 500 through 599.
For H.323 calls, the system drops ARQ messages and sends back ARJ messages.
3.3 Overload Protection Configuration
3.3.1 Entering Overload Protection View
Execute the following command in system view.
Table 3-1 Enter overload protection view
Operation Command
Enter overload protection view overload-protection
3.3.2 Configuring Overload Protection Table
For a PS, you can configure an overload protection table, mapping CPU usage rate to
packet drop rate. This allows the system to drop a defined number of call requests
randomly when the CPU usage rate of the PS reaches certain value. You can configure
up to five entries.