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Chapter 3 Topology
Failure and Recovery
Cisco SCE 1000 2xGBE Installation and Configuration Guide
3-6 OL-7821-05
The transition to the backup SCE 1000 platform is transparent. Once the routers/switches detected
that traffic has been cut, they start sending traffic through the redundant link. After this occurs, the
failed SCE 1000 can be fixed/replaced with no downtime, since the box is effectively
disconnected from the network. After fixing/replacing the failed SCE 1000, you must copy the
configuration of the current active SCE 1000 to the fixed/replaced SCE 1000.
The backup and restore procedures used for copying policies and Service Configurations from
one SCE 1000 to the next are detailed in the Service Control Application Suite for Broadband
User Guide.
Failure and Recovery
It is important to decide how the system should behave in case of the failure of the SCE 1000,
both during the time that the unit is down and after recovery. This decision is influenced by
several factors:
• Physical installation (connection mode)
• Redundancy
• Relative importance of maintaining connectivity vs. the continuity of the value-added services
that the SCE 1000 enables.
Physical Installation
In a link connection via an external optical splitter, SCE 1000 failure does not affect traffic flow,
which continues through the external optical splitter. When the SCE 1000 detects a failure that
requires a recover by reboot, it immediately switches to Cutoff mode, stopping all traffic flow
over the link until the SCE 1000 unit is restored to operation.
When operation resumes, the defined operational bypass mode is automatically resumed.
The configuration of a bump-in-the-wire installation depends on the remaining two factors.
Redundancy
Redundancy requires two platforms on parallel links, one active and one standby, in inline
topology. When the active SCE 1000 platform detects a failure situation, it will immediately
switch to Cutoff mode, causing the routers/switches on both ends to switch the traffic to the
standby link and thus activate the standby SCE 1000 platform.
There are two options when the failed SCE 1000 platform is finished reloading:
• It may either actually resume operation in the defined operational bypass mode, returning to
its status as the active SCE 1000 platform.
• It may remain inactive in the failure bypass mode.