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Chapter 3 Topology
Topology-Related Parameters
Cisco SCE 1000 2xGBE Installation and Configuration Guide
3-8 OL-7821-05
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 1000 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 1000 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 1000 topology, the value of this parameter is determined by whether or not the
link can be completely cut when the SCE 1000 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.
Link Failure Reflection Parameter
The link failure reflection refers to the behavior of the SCE 1000 when one of the data links fails.
Some network redundant topologies require a layer 1 cutoff in order for the network element to
recognize the link failure and translate it into action (switch to redundant link). In this case, if one
of the ports fails, it must be reflected to the other port as well.
• Link failure-reflection — When one data port link fails, the SCE 1000 forces the other port
link down as well. The port will be forced down as long as the first port link is down. When
the problematic port link goes up, the other port link will also be turned on again.
• No link failure-reflection — Link failure is not reflected to the other port.
Note
Default value = no link failure-reflection