Reference Guide

1086 | E-Series TeraScale Debugging and Diagnostics
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The following graphic illustrates the E600 and E1200 switch fabric architecture. Each ingress and egress
Buffer and Traffic Management (BTM) ASIC maintains nine channel connections to the TeraScale Switch
Fabric (TSF) ASIC.
Respond to PCDFO events
Troubleshooting PCDFO events requires applying some human intelligence to differentiate between
transient and systematic failures. PCDFO events can be caused by several factors, including:
• Backplane noise
• Data corruption
• Bad epoch timing
• Mis-configuration of backplane
There are two PCDFO error types: Transient and Systematic. Transient error are non-persistent events that
occur as one-events during normal operation. Systematic errors are repeatable events. For example, some
hardware device or component is malfunctioning in such a way that it persistently exhibits incorrect
behavior.
For the transient case, PCDFO errors are not reported to the log. The hardware system automatically
recovers from the error state, and the dataplane continues to function properly. In persistent case, PCDFO
errors will appear in the log, and the error state is likely to remain if not handled.