Data Flow - Cisco SCE 8000 10GBE Software Configuration Manual

How VAS Traffic Forwarding Works
The Cisco SCE platform performs load sharing between multiple VAS servers belonging to the same
server group; the balance is based on the subscriber load. In other words, the Cisco SCE platform ensures
that the subscribers are evenly distributed between the VAS servers in the same group.The mapping of
subscriber to a VAS server (per group) is maintained even when servers are added or removed from the
group either due to configuration changes or changes in the operational status of the servers in the group.
The mapping changes only if the same server changes its status.
The following sections explain in more detail when and how the mapping is changed:
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Data Flow

In a deployment using VAS traffic forwarding, there are two types of data flows:
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Figure 14-2
VAS server.
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Cisco SCE 8000 10GBE Software Configuration Guide
14-6
Non-VAS Data Flow, page 14-7
VAS Data Flow, page 14-7
Non-VAS flow
VAS flow
depicts the two types of data flows running through a single Cisco SCE platform and a single
Ports are illustrated as two unidirectional half ports, RX (on the left side) and TX (on the right side):
The Cisco SCE platform has four ports.
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The VAS server has two ports.
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For the sake of illustration, the Cisco SCE platform traffic flow direction is from left to right while
the VAS traffic flow is from right to left. The arrow below the name of the element indicates the
traffic flow direction.
The Ethernet switches are omitted.
Each line represents a flow:
Thick line is a non-VAS flow.
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Thin line is a VAS flow.
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Black line indicates part of a flow that does not have VLAN tag
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– Red line indicates part of a flow that has a VLAN tag
Chapter 14 Value-Added Services (VAS) Traffic Forwarding
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