Cisco Cisco Unified Contact Center Enterprise 9.0(2) Maintenance Manual
Figure 6: NIC Fault Tolerance
In a duplexed environment, two NICs are on-line and handling routing requests simultaneously.
Typically, each NIC handles part of the total call routing load for the system software. The
Synchronizers combine the two input streams to ensure that both sides of the Central Controller
receive the same routing requests. If one of the NIC processes fails, or one side of the Central
Controller is removed from service, the signaling network detects that communication is no
longer possible to that NIC and automatically sends all routing requests to the remaining NIC
process.
Typically, each NIC handles part of the total call routing load for the system software. The
Synchronizers combine the two input streams to ensure that both sides of the Central Controller
receive the same routing requests. If one of the NIC processes fails, or one side of the Central
Controller is removed from service, the signaling network detects that communication is no
longer possible to that NIC and automatically sends all routing requests to the remaining NIC
process.
Peripheral Gateways
Peripheral Gateways use a combination of the synchronization and hot standby approaches to
fault tolerance. The Open Peripheral Controller (OPC) operates as a synchronized process pair
on a duplexed PG system. The Peripheral Interface Managers (PIMs) typically use the hot
standby approach. The following figure shows how synchronization and hot standby are employed
in a duplexed Peripheral Gateway (PG).
fault tolerance. The Open Peripheral Controller (OPC) operates as a synchronized process pair
on a duplexed PG system. The Peripheral Interface Managers (PIMs) typically use the hot
standby approach. The following figure shows how synchronization and hot standby are employed
in a duplexed Peripheral Gateway (PG).
Administration Guide for Cisco Unified ICM/Contact Center Enterprise & Hosted Release 8.x
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Chapter 2: Fault Tolerance
Peripheral Gateways