Chapter 3 | Topology |
Issues to Be Considered
SCE Platform Configuration
There are four
•Connection mode — Can be Inline or
May be configured via either the setup command or the
•Bypass mode when the SCE 1000 is not operational
May be configured via either the setup command or the
•Status after reboot caused by fatal error or abnormal shutdown — This parameter determines whether the SCE 1000 returns to normal operational state after a failure.
May be configured via either the setup command or the
•Link failure reflection — This parameter determines the behavior of the system when there is a link problem. In some topologies it is required that link failure on one port be reflected to the other port, to allow the higher layer redundancy protocol in the network to function correctly.
May be configured via the link
Failure Detection Mechanism
The SCE 1000 contains various mechanisms to monitor the status and to detect failures. The main mechanisms are:
•Boot time diagnostics failure. When there is a failure in diagnostics testing at boot time the system will remain in failure status.
•Watchdog mechanism. There are two types of watchdogs:
•HW watchdog. A hardware mechanism that detects control entity failure.
•SW watchdog. A software mechanism that periodically checks for software failures in the SCE 1000. If a failure is detected, an error massage is sent and the SCE 1000 reboots.
•Run time hardware tests. The system periodically tests the hardware components for error. If a hardware component is malfunctioning, it will be discovered by the system within seconds.
Bypass Mechanism
The SCE 1000 includes a Network Interface Card with a bypass mechanism that is enabled upon SCE 1000 failure. In addition, when connected
The bypass card supports the following four modes:
•Bypass — The bypass mechanism preserves the network link, but traffic is not processed for monitoring or for control.
Cisco SCE 1000 2xGBE Installation and Configuration Guide
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