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Cisco SCE8000 GBE Installation and Configuration Guide
Chapter 2 Introduction to the Cisco SCE 8000 10 GBE Platform
The Cisco SCE 8000 Optical Bypass
The Cisco SCE 8000 Optical Bypass
This section describes the following:
• Optical Bypass Functionality, page 2-12
• Optical Bypass Module (OPB-SCE8K), page 2-13
The Cisco SCE 8000 platform optical bypass module preserves the service provider 10 GBE links under
all circumstances. At power failure, the bypass is automatically activated. It can also be activated by the
Cisco SCE 8000 software.
The Cisco SCE 8000-SIP module already includes an internal electrical bypass, but it is strongly
recommended to use the optical bypass module for addressing the following scenarios:
• During platform reboot (Software reload)—If the external bypass module is not used, there is a
11-second period during which the link is forced down (cutoff functionality). If any routing or
spanning tree protocols are used in the network, this delay may be extended.
• During a power failure—The Cisco SCE 8000 has two power supplies. A power failure occurs only
when both of them fail.
In case the Cisco SCE 8000 platform must be replaced, it is possible to remove the bypass modules from
the Cisco SCE 8000 chassis without disconnecting them from the network and then reinstall them in the
new SCE platform, so that traffic links are preserved even in a case of complete failure and replacement
of the Cisco SCE 8000 platform. (See the “Replacing the Optical Bypass Module Without Disrupting
Traffic on the Link” section on page 9-33.)
Optical Bypass Functionality
The optical bypass module is connected bump-in-the-wire in the 10-GBE link. It is then connected to
the Cisco SCE 8000 platform with two types of connections:
• 10 GBE optical connections for data link traffic—10 GBE connections from the optical bypass
module to one pair of the 10 GBE SPA ports.
• Control connection—Connection to the RJ-11 External Bypass connector on the Cisco SCE
8000-SCM, so the optical bypass is activated if the Cisco SCE 8000 platform fails.
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