Troubleshooting guide

52 Advanced System Diagnostics and Troubleshooting Guide
Diagnostics
Figure 10: Backplane health check paths (BlackDiamond architecture)
System Health Checks: A Diagnostics Suite
Keep in mind that the goal of the diagnostics suite is to help users achieve the highest levels of network
availability and performance by having system hardware, software, and diagnostics work together to
reduce the total number of failures and downtime through:
• More accurate reporting of errors (fewer false notifications; more information about actual errors)
• Early detection of conditions that lead to a failure (so that corrective action can be taken before the
failure occurs)
• Automatic detection and correction of packet memory errors in the system’s control and data planes
Diagnostic Suite Components
The components that make up the diagnostic test suite include:
• Power on self test (POST)
— Runs at system boot
— Offers configurable levels
• Runtime, slot-based diagnostics
— Normal, extended, and packet memory scan
— Run on demand by user command
CPU
Subassembly
EXT MAC
To PHY
To MSM-ATo MSM-B
To BackplaneTo Backplane To BackplaneTo Backplane
To PHY
EXT MAC
INT MACINT MAC
NVRAM
CPLD
UART
PCMCIA
FLASH
SRAM
MGMT
OTP
PQM
Packet
Memory
FDB
VPST
AFQM
ASIC
(Quake)
Control Bus Control Bus
Control Bus Control Bus
I/O Module (G8Xi) Master MSM (MSM-A)
Master MSM Daughter Card
(To all other slots)
SE
ASIC
(Twister)
PBus PBus
BackplaneBackplane
DN_032A
MACMAC
MACMAC
OTP
PQM
Packet
Memory
FDB
VPST
AFQM
ASIC
(Quake)
SE
ASIC
(Twister)
PBus PBus
CPU loads test packet
to MSM Fabric.
Test packet returned to
CPU on Control bus.
Test packet transferred to
I/O module Fabric on data
bus (fast path).