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How VAS Traffic Forwarding Works
The VAS feature enables the user to divert a specified part of the traffic streams to an individual VAS
server or appliance, or a cluster of them. The diversion is based on the subscriber package, flow type and
the availability of the VAS servers. This capability also delivers a load balancing function for even
distribution of the load on the various VAS servers.
The solution provides support for multiple VAS service types using different VAS Server Groups.
Several servers of the same type can be deployed to increase the total capacity and resiliency.
The SCE platform performs subscriber load sharing between the active servers of the same Server
Group. It is able to identify the active servers among the defined servers through a dedicated Health
Check mechanism.
There is also a VAS over 10G solution, which is a special case of the Cisco Multi-Gigabit Service
Control Platform (MGSCP) solution, supporting only one external 10G link and using a Cisco
6500/7600 Series router as a dispatcher to distribute the external 10G link and as the switch towards the
VAS servers
VAS Service Goals
The VAS traffic forwarding functionality allows the Service Control solution to meet several important
service goals:
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How VAS Traffic Forwarding Works
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Subscribers are provisioned to the VAS services as part of the normal provisioning process of new
subscribers to SCA BB.
Cisco SCE 2000 and SCE 1000 Software Configuration Guide
12-2
Allows service providers to provide a range of Value Added Services to their subscribers, thus
increasing customer satisfaction.
Allows the SCE platform to forward part of the traffic to third party devices that can provide
additional, complementary services.
The SCE platform, due to its strong classification capabilities, forwards only the part of the traffic
that should get the additional service:
Based on subscriber awareness
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Based on the policy that was configured
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Allows the Service Control solution to include Value Added Servers that cannot be deployed inline
for various reasons (for example, cannot support throughput or are not carrier grade for inline
insertion).
Provides easy interoperability and flexibility for setting different services.
Since the VAS feature emulates a regular IP network for the third party devices, no special support
is required on their part.
Requirements for VAS Servers, page 12-4
VAS Traffic Forwarding and SCA BB, page 12-5
VLAN Tags for VAS Traffic Forwarding, page 12-5
Service Flow, page 12-6
Data Flow, page 12-6
Load Balancing, page 12-8
Chapter 12
Value Added Services (VAS) Traffic Forwarding
OL-7827-12
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