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VAS Traffic Forwarding Topologies
The health check procedure does not require a special interface with the VAS server, the health check
traffic goes through the same network channels as any other VAS traffic. However, there are two
assumptions the VAS servers should fulfill:
•
•
VAS Server States
When determining whether a VAS server is active, the system considers the following two parameters:
•
•
VAS Traffic Forwarding Topologies
The following sections describe the following VAS traffic forwarding topologies:
•
•
•
A topology in which a VAS server is directly connected to the SCE platform is not supported. If a
Note
topology of a single SCE platform connected to a single VAS server is desired, a switch should still be
used between the SCE platform and the VAS server.
Single SCE Platform, Multiple VAS Servers
In this topology, a single SCE platform is forwarding VAS traffic to one or more VAS servers through
two Ethernet switches
The two Ethernet switches are necessary to avoid a situation in which a single MAC address has two
ports or a single VLAN tag has two destinations. Each Ethernet switch should be configured to trunk
mode with MAC learning disabled.
Cisco SCE 2000 and SCE 1000 Software Configuration Guide
12-12
The VAS server does not drop traffic unless it is specifically configured to do so. Therefore, if the
VAS server-SCE platform connectivity is operative, the health check packets should reach the SCE
platform safely.
Alternatively, it should be able to configure the VAS server to pass traffic on specific ports (the
health check ports).
In case of a failure, the VAS server should drop, not bypass, the traffic (cut the link), so that the SCE
platform will be able to identify the failure.
Admin mode as configured by the user — Enabled or disabled
VAS server state as reported by the health check
Single SCE Platform, Multiple VAS Servers, page 12-12
Multiple SCE Platforms, Multiple VAS Servers, page 12-14
VAS over 10G, page
12-32, which is a special case of Cisco Multi-Gigabit Service Control Platform
(MGSCP) solution, supporting only one external 10G link and using a Cisco 6500/7600 Series
router as a dispatcher to distribute the external 10G link and as the switch towards the VAS servers.
(Figure
Chapter 12
12-4).
Value Added Services (VAS) Traffic Forwarding
OL-7827-12
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