This topic describes how to incorporate a load balancer in
IM and Presence Service dual-node configuration for use with incoming CSTA/TCP
connections. We recommend the Cisco CSS 11501 Content Services Switch for the
The following table gives an overview of the necessary
tasks for configuring the Cisco CSS 11501 Content Services Switch for this
integration. For detailed information on each task, refer to the
Cisco CSS 11500 Content Services Switch
documentation at the following URL:
Table 1 Cisco CSS 11501 Configuration Checklist for Load Balancing over
Create a SIP service entry for each
IM and Presence Service node.
The keepalive port
should be the same port as the content, port 5060.
message type value should be ‘tcp’.
Create a SIP rule that defines the content and the
services that will manage this content
The content is SIP on port 5060
The SIP service entries (for each
IM and Presence Service node) must be associated to the rule.
Create a NAT (Network Address Translation) rule to
show the Virtual IP Address of Load Balancer
The NAT rule shows the packets returning from the
IM and Presence Service node to
Microsoft OCS as
coming from the Load Balancer (and not directly from the
IM and Presence Service node).
Microsoft OCS, you must
configure the following parameters:
The next hop address to be
the Virtual IP address of Load Balancer for the SIP message routing.
The default TCP listener
on port 5060.
IM and Presence Service, you must configure the Virtual IP address of the Load
Balancer. This is configured in the Virtual IP address field in
Cisco Unified CM IM and Presence Administration > System > Service
Parameters > Cisco SIP
Proxy > General Proxy Parameters