External Optical Bypass - Cisco SCE 8000 10GBE Software Configuration Manual

Chapter 8 Configuring the Connection

External Optical Bypass

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The Cisco SCE 8000 supports connection to up to two external optical bypass devices. These protect the
line against power failure or total hardware failure, which prevents the hardware card from bypassing
the traffic. Each external optical device protects a single traffic link passing through the Cisco SCE
platform. The main objective of the external bypass is to provide automatic redundancy and failover
support. However, the user can also manually enable the external bypass, assuming it is connected.
At power failure the external bypass is automatically activated. The external bypass can also be
controlled by the software and by hardware in case of software failure.
In case of power failure, the bypass shortcuts the interfaces that are connected to the two sides of the
Cisco SCE 8000, bypassing all the traffic, as illustrated in
The Cisco SCE 8000 can detect the presence of each external optical bypass device, and warns the user
by various means (CLI show command, system operational-state, SNMP traps) if an expected external
bypass device is not detected as present.
Figure 8-1
How to Activate the External Bypass
From the SCE(config if)# prompt, type:
Command
external-bypass
OL-30621-02
How to Activate the External Bypass, page 8-7
How to Deactivate the External Bypass, page 8-8
How to Set the External Bypass to the Default State, page 8-8
How to Display the State of the External Bypass, page 8-8
External Optical Bypass Connectivity
Default bypass state (no power)
Non-default bypass state
OPB
3/0/0
3/2/0
SCE8000
OPB
3/1/0
3/3/0
Purpose
Activates the external bypass.
Cisco SCE 8000 10GBE Software Configuration Guide
External Optical Bypass
Figure 8-1.
8-7