3-9
Cisco SCE 2000 4xGBE Installation and Configuration Guide
OL-7824-07
Chapter 3 Information About Topology
Information About Topology Considerations
Information About Two Cascaded SCE 2000s For Dual Links
In this topology, two cascaded SCE 2000s are used. This allows a fail-over solution, where in case of a
failure of one SCE 2000 the functionality that the SCE 2000 provides is preserved by the redundant
platform.
•
Two Cascaded SCE 2000s: Inline Topology, page 3-9
Two Cascaded SCE 2000s: Inline Topology
This topology allows both control and monitoring functionality where redundancy is required and
“inline” connection is used (
). The two
S
CE 2000s are cascaded, so the primary SCE 2000
processes the traffic of the two links, while the secondary SCE 2000 only bypasses the traffic of its links
to the primary SCE 2000 for processing, and then bypasses the processed traffic back to the link. The
two SCE 2000s also exchange keep-alive messages and subscriber state information.
In case the primary SCE 2000 fails, the two SCE 2000s switch their roles, and this way fail-over is
provided.
