Cisco SCE 8000 10GBE Software Configuration Manual page 320

Redundancy and Failover
Internal failure detection—The Cisco SCE platform monitors for hardware and software conditions
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such as overheating and fatal software errors.
• Inter-device failure detection—The Cisco SCE platform sends periodic keep-alive messages via the
cascade ports
• The Cisco SCE platform-Subscriber Manager (SM) communication failure detection—A failure to
communicate with the SM may be regarded as a cause for failover. However, this communication
failure is not necessarily a problem in the Cisco SCE platform. If the connection to the SM of the
active Cisco SCE platform has failed, while the connection to the SM of the standby Cisco SCE
platform is alive, a failover process will be initiated to allow the Cisco SCE platform proper
exchange of information between the Cisco SCE platforms and the SM.
• Link failure—The system monitors all three types of links for failures:
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This type of failure, in most cases, does not require reboot of the Cisco SCE platform. When the
connection with the SM is re-established the Cisco SCE platform is again ready for hot standby. If
both Cisco SCE platforms lose their connections with the SM, it is assumed that it is the SM which
has failed, thus, no action will be taken in the Cisco SCE platform.
Cisco SCE 8000 10GBE Software Configuration Guide
11-4
Traffic port link failure—Traffic cannot flow through the Cisco SCE platform.
Cascade port link failure—Traffic cannot flow between the Cisco SCE platforms through the
cascade ports.
Management port link failure—This is not a failure that interrupts traffic on the link in and of
itself. However, when SM is used, management port link failure will cause an SM connection
failure and this, in turn, will be declared as a failure of the Cisco SCE platform.
Chapter 11 Redundancy and Failover
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