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Chapter 12
Value Added Services (VAS) Traffic Forwarding
The following is the sequence of steps in the VAS data flow from the VAS server out to the network:
1.
2.
3.
4.
5.
6.
7.
Failover Support
The SCE monitors the health of the connection to each VAS server on the active VAS link; failure of
either the 7600/6500 or the VAS server will cause the server health check to fail
failure of one or more server groups causes the VAS traffic to be forwarded to the redundant
7600/6500/VAS servers system.
How failover works:
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The VAS server processes the packet and sends it to the SCE platform from the VAS network port.
Note that as the VAS server received the packet with no VLAN tag, it also transmits it with no VLAN
tag.
The packet is received on the 7600/6500 access port, is assigned VLAN tag 525, and is sent towards
the EC configured with VLAN 525.
At the trunk port, the VLAN tag 525 is translated to VLAN tag 505.
The packet is sent towards port 1 of the SCE platform based on the subscriber side IP.
SCE platform gets the packet on port 1 (S) and forwards it towards the network through port 2 (N)
The SCE platform forwards the packet with NO VLAN tag.
The packet is received on the 7600/6500 trunk port, gets the native VLAN 101 and sent towards the
access port configured with VLAN 101.
The packet is sent towards the network with no VLAN tag.
The VAS link (the link on which to send the VAS traffic) is dynamically selected. In failover, the
SCE platform switches to its backup subscriber and network ports, so that the VAS traffic is
forwarded to the redundant set of VAS devices, as illustrated in the following figure.
Cisco SCE 2000 and SCE 1000 Software Configuration Guide
VAS over 10G
(Figure
12-10). The
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