Cisco SCE8000 GBE Manuale di configurazione - Pagina 10
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The Cisco SCE8000 Optical Bypass
The Cisco SCE8000-SIP module already includes an internal electrical bypass, but it is strongly
recommended to use the optical bypass module for addressing the following scenarios:
•
•
In a case where the Cisco SCE8000 platform must be replaced, it is possible to remove the bypass
modules from the SCE8000 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 SCE8000 platform. (See
Disrupting Traffic on the Link, page
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 SCE8000 platform with two types of connections:
•
•
Optical Bypass Module Connectivity
The optical bypass module functions as follows:
•
•
Figure 2-7
Cisco SCE8000 10GBE Installation and Configuration Guide
2-10
During platform reboot (SW reload)—If the external bypass module is not used, there is a 10-second
period (at most) during which the link is forced down (cutoff functionality).
During a power failure —The Cisco SCE8000 has two power supplies. A power failure occurs only
when both of them fail.
10GBE optical connections for data link traffic — 10 GBE connections from the optical bypass
module to one pair of the 10GBE SPA ports.
Control connection — Connection to the RJ-11 External Bypass connector on the SCE8000-SCM,
so the optical bypass is activated if the Cisco SCE8000 platform fails.
Under normal conditions, the bypass module directs traffic to flow via the Cisco SCE8000
(Figure
2-7).
Under failure conditions, the optical bypass shortcuts the interfaces that are connected to the traffic
link, and all traffic flows through the optical bypass module, bypassing the SCE platform
(Figure
2-7).
Optical Bypass Module Connectivity
Default bypass state (no power)
Non-default bypass state
OPB
3/0/0
3/2/0
SCE8000
OPB
Chapter 2
Replacing the Optical Bypass Module without
9-27.)
3/1/0
3/3/0
Introduction to the Cisco SCE8000 10GBE Platform
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