Alteon Application Switch Operating System Application Guide
Load Balancing Special Services
324 Document ID: RDWR-ALOS-V2900_AG1302
TCP-Based SIP Servers
Alteon supports TCP-based load balancing for SIP and TLS for services such as Microsoft Office
Communication Services (OCS) R1 and R2, and the Nortel Multimedia Communication Server (MCS).
Microsoft-approved OCS load balancing for both consolidated and expanded topologies enables
support for up to 125,000 telephony users.
Configuring SIP Server Load Balancing
Figure 50 - SIP Load Balancing, page 324 illustrates an Alteon performing TCP-based SIP SLB. In
this example, three SIP proxy servers are configured in a Real Server Group 100. Alteon is
configured for SIP service (port 5060) for virtual server 40.40.40.100.
Figure 50: SIP Load Balancing
To configure SIP load balancing
1. Before you start configuring SIP load balancing:
— Connect each SIP proxy server to Alteon
— Configure the IP addresses on all devices connected to Alteon
— Configure the IP interfaces on Alteon
— Enable Direct Access Mode (DAM)
— Disable proxy IP addressing
2. Enable server load balancing.
3. Configure IP addresses for the SIP proxy servers.
>> # /cfg/slb/on
>> # /cfg/slb/real 1/rip 10.10.10.1
(Define address for MCS 1)
>> Real server 1# ena
(Enable Real Server 1)
>> # /cfg/slb/real 2/rip 10.10.10.2
(Define address for MCS 2)
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