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Chapter 12
Value Added Services (VAS) Traffic Forwarding
In this description of the VAS data flow, note the following important points:
•
•
•
•
•
VAS Data Flow: To the VAS Server
Figure 12-8
OL-7827-12
This section describes the data flow of packets originating at the subscriber side of the 10G link and
sent towards the network. The network to subscriber flow exactly mirrors this flow.
The description does not elaborate on the internal path inside the 7600/6500 device. It is intended
to present the path between the SCE platform, the 7600/6500, and the VAS servers, and describe
how the VLAN tag changes along that path.
Although the figures show only one SCE platform, in actuality the VAS over 10G topology would
usually consist of multiple SCE platforms on multiple ECs. In such a topology, the ports towards the
VAS servers must be trunk ports, which allow the presence of multiple VLAN tags, since there will
be a unique VLAN tag for each EC. (As noted previously, all SCE platforms on one EC must use
the same VLAN tag per VAS server).
The data flow is presented in two parts:
To the VAS servers
–
From the VAS servers
–
The figures assume that the VAS link is link 1.
Data Flow in VAS over 10G Topology: To the VAS Server
S
N
525
100
2
1
505,525
Native: 100
3
1-S
2-N
3-S
4-N
VAS
7
505
7600
6
EC
EC
505,525
Native: 101
SCE
4
Cisco SCE 2000 and SCE 1000 Software Configuration Guide
VAS over 10G
S
N
101
5
1-S
2-N
3-S
4-N
12-35
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