Cisco SCE 8000 10GBE Software Configuration Manual page 323

Chapter 11 Redundancy and Failover
When the failed Cisco SCE platform recovers, it will remain in standby, while the previously standby
Cisco SCE platform remains active. Switching the Cisco SCE platforms back to their original roles may
be performed manually, if required, after the failed Cisco SCE platform has either recovered or been
replaced.
If the failure is in the standby Cisco SCE platform, it will continue to forward traffic to the active Cisco
SCE platform and back to its link, while the active Cisco SCE platform continues to provide its normal
processing functionality to the traffic of the two links.
For information regarding the synchronization of subscriber information between cascaded Cisco SCE
Note
platforms and the effect of failover on the subscriber databases, see
Templates" section on page
There are three user-configurable options that are relevant in a situation when a Cisco SCE platform
fails:
• Bypass—Maintain the link in bypass mode (continue sending traffic to the other Cisco SCE
platform, and then continue forwarding the processed traffic back to the link). The incoming traffic
in the failed Cisco SCE platform is forwarded to the working Cisco SCE platform, where it is
processed and then sent back to the original Cisco SCE platform and back to the link. This is the
default configuration.
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• Cutoff—Change the link of the failed Cisco SCE platform to cutoff (layer 1) forcing the network to
switch all traffic through the line of the working Cisco SCE platform. This will, of course, decrease
the network capacity by 50%, but may be useful in some cases.
This option is available for use in special cases, and requires special configuration.
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External-bypass—Activate the external bypass device connected to the failed Cisco SCE platform,
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passing all traffic through the line without being serviced by the failed Cisco SCE platform.
Although this may cause the traffic passing through the other link (that of the non-failed Cisco SCE
platform) to get service in split-flow conditions if asymmetric routing is present, it may be useful in
some cases.
This option is available for use in special cases, and requires special configuration.
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OL-30621-02
10-7.
Effect on the network link—Negligible.
Effect on the Cisco SCE platform functionality—The effect on the Cisco SCE platform
functionality is dependent on the failed Cisco SCE platform.
If the failure is in the standby Cisco SCE platform—The active Cisco SCE platform continues
providing its normal functionality, processing the traffic of the two links.
If the failure is in the active Cisco SCE platform—The standby Cisco SCE platform takes over
processing the traffic, and becomes the active Cisco SCE platform.
Effect on the network link—The network loses 50% of its capacity (until the failed Cisco SCE
platform has recovered).
Effect on the Cisco SCE platform functionality—The effect on the Cisco SCE platform
functionality is dependent on the failed Cisco SCE platform.
If the failure is in the standby Cisco SCE platform—The active Cisco SCE platform continues
providing its normal functionality, processing the traffic of the two links.
If the failure is in the active Cisco SCE platform—The standby Cisco SCE platform takes over
processing the traffic, and becomes the active Cisco SCE platform.
Effect on the network link—Negligible
"Anonymous Groups and Subscriber
Cisco SCE 8000 10GBE Software Configuration Guide
Hot Standby and Failover
11-7