Table of Contents
Advertisement
Chapter 14
Value-Added Services (VAS) Traffic Forwarding
Figure 14-2
the subscriber works in the same way, but is received on the network port (N) and transmitted on the
subscriber port (S).
Figure 14-2
Non-VAS Data Flow
The data flow steps for a non-VAS flow are:
1.
2.
3.
VAS Data Flow
A VAS data flow is slightly more complex than the basic data flow. It is received and transmitted in the
same manner as the basic non-VAS Cisco SCE platform flow, but before it is transmitted to its original
destination, it flows through the VAS server.
The data flow steps for a VAS flow are:
1.
2.
3.
4.
OL-30621-02
illustrates the data flow from the subscriber to the network. Data flow from the network to
Data Flow in a VAS System
1-S
2-N
3-S
4-N
S
N
No VAS
VAS (without VLAN)
VAS (with VLAN)
A subscriber packet is received at the Cisco SCE platform Port 1 (S).
The Cisco SCE platform classifies the flow as non-VAS flow.
The packet is sent to the network on Port 2 (N).
A subscriber packet is received at the Cisco SCE platform Port 1 (S).
The Cisco SCE platform classifies the flow as a VAS flow.
The Cisco SCE platform adds a VLAN tag to the packet.
The VLAN tag is used by the Ethernet switch to route the packet to the proper VAS server.
The packet now has a VLAN tag, which is indicated by the red line.
How VAS Traffic Forwarding Works
SCE
1-S
2-N
3-S
4-N
VAS
S
N
Cisco SCE 8000 10GBE Software Configuration Guide
14-7
Advertisement
Chapters
Table of Contents
