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Chapter 14
Value-Added Services (VAS) Traffic Forwarding
Data Flow
In a data flow:
1.
2.
3.
4.
5.
6.
7.
8.
Multiple Cisco SCE Platforms, Multiple VAS Servers
n this topology, multiple Cisco SCE platforms are connected to multiple VAS servers. At least one VAS
server receives traffic from more than one Cisco SCE platform; if the VAS servers are each in an
exclusive relationship to a particular Cisco SCE platform, it would simply be several single Cisco SCE
platform to multiple VAS server topologies grouped together.
OL-30621-02
A subscriber packet is received at Port #1 (Subscriber).
The Cisco SCE platform opens a flow and classifies the flow as either a non-VAS (blue) flow or as
a VAS flow (red).
If the flow is non-VAS (blue), the Cisco SCE platform passes the packet to the network. The VAS
server is not involved in this case.
If the flow is a VAS flow (red), the Cisco SCE platform selects the VAS server to which the packet
should be sent, adds the server VLAN tag to the packet, and transmits the packet on Port #4
(Network).
The packet is routed by the Ethernet switch to the VAS server according to its VLAN tag (the port
towards the VAS server should be the only port with this VLAN tag allowed).
The VAS server processes the packet and either drops or forwards it without changing the VLAN
tag.
The packet is forwarded by the Ethernet switch to the Cisco SCE platform according to its VLAN
tag (the port towards the Cisco SCE platform should be the only port with this VLAN tag allowed).
The Cisco SCE platform receives the packet on port #3 (Subscriber), strips the VLAN tag, and
forwards the packet to the network via Port #2 (Network).
VAS Traffic Forwarding Topologies
Cisco SCE 8000 10GBE Software Configuration Guide
14-15
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