Chapter 3 | Topology |
The connection mode parameter is determined by the physical deployment of the SCE 1000 as follows:
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•External optical splitter installation =
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.
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•Bypass mode is required for the following:
•
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
•No link
Note Default value = no link
Cisco SCE 1000 2xGBE Installation and Configuration Guide
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