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Chapter 3 Topology
Topology-Related Parameters
Cisco SCE 1000 2xGBE Installation and Configuration Guide
OL-7821-05 3-7
Maintaining the Network Links vs Maintaining SCE 1000 Platform Functionality
When a single SCE 1000 is deployed, the user may decide that in case of a failure, maintaining
the network link is more important than providing the SCE 1000 functionality. In this scenario,
when the SCE 1000 detects a failure that requires a reboot process for recovering, it immediately
switches to Bypass mode, allowing all traffic to bypass the SCE 1000. The SCE 1000 stays in
Bypass mode maintaining the network link, albeit without SCE 1000 processing, until the SCE
1000 fully recovers from the failure and is ready to resume normal functioning.
Alternatively, the user may decide that the SCE 1000 functionality is sufficiently crucial to
require severing the link if the SCE 1000 platform fails. In this case, when the SCE 1000 detects a
failure that requires a reboot process for recovering, it immediately switches to Cutoff mode,
stopping all traffic flow. The SCE 1000 stays in Cutoff mode, halting all traffic, until it fully
recovers from the failure and is ready to resume normal functioning. In Cutoff the physical
interface is blocked, enabling the network device connected to the SCE 1000 to sense that the link
is down.
Topology-Related Parameters
Refer to the following sections to determine the correct values for all topology-related parameters
before beginning run the initial setup of the SCE 1000.
Connection Mode Parameter
The connection mode parameter refers directly to the physical topology in which the SCE 1000 is
installed. Installation is possible in either of the two following modes:
• Inline — The SCE 1000 resides on the data link between the subscriber side and the network
side, thus both receiving and transmitting packets.
• Receive-only — The SCE 1000 does not reside physically on the data link. Data is forwarded
to the SCE 1000 via an external optical splitter. The SCE 1000 itself receives only and does
not transmit.
Note
Default value = Inline
The connection mode parameter is determined by the physical deployment of the SCE 1000 as
follows:
• Bump-in-the-wire installation = Inline connection mode.
• External optical splitter installation = Receive-only connection mode.