Physically Connected Links Parameter; On-Failure Mode Parameter - Cisco SCE 2000 4xGBE Installation And Configuration Manual

Physical Topologies
•
The connection mode parameter is determined by the physical deployment of the SCE 2000, as
follows:
•
•
•
•

Physically Connected Links Parameter

If the system consists of more than one device, this parameter defines which link is connected to
this SCE 2000. Currently the system supports a maximum of two links, which are designated link
0 and link 1.
Priority
In a cascade topology, the user must define the priority of each SCE 2000.
•
•
Note that these defaults apply only when both devices are started together. However, if the
primary SCE 2000 fails and then recovers, it will not revert to active status, but remains in
standby status, while the secondary device remains active.

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:
•
•
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.
•
Cisco SCE 2000 4xGBE Installation and Configuration Guide
3-10
Receive-only — The SCE 2000 does not reside physically on the data link. Data is
•
forwarded to the SCE 2000 via an external switch. The SCE 2000 itself receives only and
does not transmit.
Cascade — Indicates a two SCE 2000 topology where the SCE 2000s are connected via
the cascade ports.
Single SCE 2000 inline installation = "Inline" connection mode.
Single SCE 2000 optical splitter installation = "Receive-only" connection mode.
Two SCE 2000 inline installation = "Inline-cascade" connection mode.
Two SCE 2000 optical splitter installation = "Receive-only-cascade" connection mode.
Primary — The Primary SCE 2000 is active by default
Secondary — The Secondary SCE 2000 is the default standby.
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.
Cutoff mode is required for the following:
Redundant inline topology.
•
Chapter 3 Topology
OL-7824-04