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Cisco IP Solution Center, 3.0: MPLS VPN Management User Guide, 3.0
OL-4344-01
Chapter1 About Cisco IP Solution Center
The Four-Tier System Architecture
Figure 1-12 Redundant Load Balancing Configuration
The Four-Tier System Architecture
The Cisco ISC architecture is a four-tier architecture. The four tiers are:
•Client tier
The Client tier consists of the user web browsers or client applications accessing ISC through the
API. Just as in the previous VPN Solutions Center releases, ISC customers do not have to use ISC
through the GUI. The software can be driven fully through its northbound API. This allows our
customers to tightly integrate ISC into their OSS environment. The user web browsers communicate
with ISC’s Web server through HTTP. The client applications communicate with ISC’s CORBA
server (backward compatible API) or Web Server via XML/SOAP (new API).
•Interface tier
The Interface Tier contains one or more web servers that form a web farm. As more and more
operators need to access the system, the web farm can be scaled up by simply adding new web server
machines to the farm. This arrangement provides horizontal scalability for handling a large number
of users. It also provides high availability. As one machine of the farm goes away, the whole system
continues to function and users can continue to interact with the system through other interface tier
machines. This system allows the dynamic addition and removal of machines to and from the
web farm.
192.168.0.1
(HSRP floating IP)
Service Provider
network
192.168.0.10
(floating IP)
192.168.0.200
(floating IP)
Layer 3 router
(r-1)
192.168.0.2
active
Layer 3 router
(r-2)
192.168.0.3
standby
Layer 2
switch
(sw-1)
Web server
(ws-1)
192.168.0.100
Web server
(ws-2)
192.168.0.101
Web server
(ws-3)
192.168.0.102
93004
Load Balancer
(lb-1)
192.168.0.11
Load Balancer
(lb-2)
192.168.0.12
Web server
(ws-4)
192.168.0.103
Layer 2
switch
(sw-1)
Trunk