Dell C1048P Port Extender Networking Configuration Guide for the C9000 Series - Page 472
Graceful Restart, Software Resiliency, System Health Monitoring, Failure and Event Logging, Trace Log
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Page 472 highlights
Graceful Restart Graceful restart (also known as non-stop forwarding) is a protocol-based mechanism that preserves the forwarding table of the restarting router and its neighbors for a specified period to minimize the loss of packets. A graceful-restart router does not immediately assume that a neighbor is permanently down and so does not trigger a topology change. Dell Networking OS supports graceful restart for the following protocols: • Border gateway protocol • Open shortest path first • Protocol independent multicast - sparse mode • Intermediate system to intermediate system Software Resiliency During normal operations, the Dell Networking OS monitors the health of both hardware and software components in the background to identify potential failures, even before these failures manifest. System Health Monitoring The Dell Networking OS also monitors the overall health of the system. Key parameters such as CPU utilization, free memory, and error counters (for example, CRC failures and packet loss) are measured, and after exceeding a threshold are used to initiate recovery mechanism. Failure and Event Logging Dell Networking systems provide multiple options for logging failures and events. Trace Log To track the execution of a program, developers interlace messages with software code. These messages are called trace messages and are primarily used for debugging and to provide lower-level information than event messages, which system administrators use. Dell Networking OS retains trace messages for hardware and software and stores them in files (logs) on the internal flash. • Trace Log - contains trace messages that relate to software and hardware events, state, and errors. Trace Logs are stored in internal flash under the directory TRACE_LOG_DIR. High Availability (HA) 472
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1,205
-
1,206
-
1,207
-
1,208
-
1,209
-
1,210
-
1,211
-
1,212
-
1,213
-
1,214
-
1,215
-
1,216
-
1,217
-
1,218
-
1,219
-
1,220
-
1,221
-
1,222
-
1,223
-
1,224
-
1,225
-
1,226
-
1,227
-
1,228
-
1,229
-
1,230
-
1,231
-
1,232
-
1,233
-
1,234
-
1,235
-
1,236
-
1,237
-
1,238
-
1,239
-
1,240
-
1,241
-
1,242
-
1,243
-
1,244
-
1,245
-
1,246
-
1,247
-
1,248
-
1,249
-
1,250
-
1,251