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Cisco SCE 2000 4xGBE Installation and Configuration Guide
OL-7824-07
Chapter 3 Information About Topology
Topology-Related Parameters
On-Failure Mode Parameter
As described in the section The Bypass Mechanism, the bypass card supports four different modes. The
following two modes are possible when the SCE 2000 is not operational due to platform failure or boot:
•
Bypass
— The optical splitter forwards traffic with no intervention of the control application
running in the SCE 2000 platform, but monitoring functions continue uninterrupted.
•
Cutoff
— There is no forwarding of traffic. The link is forced down, resulting in traffic cutoff at
Layer1.
The
Forwarding
mode enables control of traffic flow and is not compatible with the non-operational
status.
In a single SCE 2000 topology, the value of this parameter is determined by whether or not the link can
be completely cut when the SCE 2000 fails, or whether traffic flow should continue across the link in
spite of platform failure.
•
Cutoff
mode is required for the following:
–
Redundant inline topology.
–
Non-redundant inline topology if value-added services are crucial and are more important than
maintaining connectivity.
•
Bypass
mode is required for the following:
–
Non-redundant inline topology if connectivity is crucial.
