Table of Contents
Advertisement
Chapter 12
Value Added Services (VAS) Traffic Forwarding
When VAS traffic forwarding is enabled
application classifies each flow as either a VAS flow or as a standard flow (non-VAS flow).
Flows that were classified to a VAS service get the usual SCA BB service, as well as being forwarded
to the VAS servers for additional service.
Logically, "VAS engine" is upstream of "SCA engine", meaning upstream traffic is first processed by
the SCA BB application, downstream is first processed by the VAS server.
Routing the traffic to the VAS servers is done by using VLAN tags.
Figure 12-1
Subscribers
Important information:
•
A single SCE platform can support up to eight VAS servers.
•
A maximum of 512 SCE platforms can be connected.
The same VAS server may be used by more than one SCE platform.
•
The VAS traffic forwarding feature is supported on the SCE 2000 4xGBE platform only.
•
When working in VAS mode, the SCE performance envelope might be up to 50% lower than in normal
Note
operation mode. The exact performance envelope is specific to the traffic mix in the customer network
and should be sized in advance.
The following sections provide a more detailed description of how VAS traffic forwarding works.
OL-7827-12
(Figure
Typical VAS Traffic Forwarding Installation
VAS Servers
PWR A
PWR B
STATUS
MNG 1
BYPASS
Cisco SCE
MNG 2
CONSOLE
2000
LINK/
10/100/
AUX
LINK RX
TX
4xGB E
Series
ACTIVE
1000
ACTIVE
LINK/
10/100/
LINK RX
1000
TX
LINK RX
TX
LINK RX
RX
MM
TX
TX
RX
MM
TX
RX
MM
TX
RX
GBE-1
MM
TX
SUB
LINE
NET
GBE-2
SUB LINE/CASCA
DE NET
SCE
12-1), in addition to all its basic functions, the SCA BB
Cisco SCE 2000 and SCE 1000 Software Configuration Guide
How VAS Traffic Forwarding Works
Network
12-3
Advertisement
Table of Contents
