How to use the a secondary NIC on the Cisco CallManager and Cisco Unity server

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Cisco CallManager:

In the Cisco CallManager, the Network Teaming Driver can be used in order to enable the functionality for the failover fault-tolerant network adapters. This driver works with Cisco Media Convergence servers that have dual network interface cards (NICs) installed. With this functionality, the standby NIC can handle all IP traffic if the primary NIC fails.

Refer to these documents for more information:

• Refer to Using the Cisco Media Convergence Server Network Teaming Driver for operating system (OS) versions 2000.4.3 and 2000.4.3a.
  
  
• Refer to Installation Procedures and Release Notes for the Cisco-provided Operating System for information about the installation and configuration of the Network Teaming Driver with earlier versions of the OS.
  
  
• How to enable teaming or failover for two NICs on the Cisco CallManager 5.x appliance for fault tolerance
  

Cisco Unity:

There are two supported configurations for installation of Cisco Unity on a platform with two NICs:

• Disable one of the NICs.
  
  
• Configure the NICs in an active-passive manner.

Cisco Unity does support dual NICs configured in an active-passive manner for fault tolerance. In this NIC configuration, the primary (active) NIC handles 100 percent of the traffic. Only in the event that it goes down, does the secondary NIC become active and handle 100 percent of the traffic. Therefore, only one IP address and one network is supported, no subnets with each NIC on a different subnet.

Refer to Configuring and Troubleshooting Dual NICs for Cisco Unity for more information about dual NICs in the Cisco Unity.