Specifications

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Cisco IGX 8400 Series Provisioning Guide, Release 9.3.3 and Later Releases
OL-1166-04
Chapter 2 Cisco IGX 8400 Series Cards
Network Trunk Module
Standard Service Module Troubleshooting
The following paragraphs describe standard service module maintenance and troubleshooting features.
Except where noted, preventive maintenance is not necessary.
Card Mismatch
When you connect an unsupported back card to the service module front card, the output from the switch
software dspcds command informs you that you have a card mismatch.
Card Self-Test
Diagnostic routines periodically run to test the card's performance. These diagnostics run in the
background and do not disrupt normal traffic. If a failure is detected during the self-test, the faceplate
red fail LED turns on. In addition, you can check the status of the card by using the switch software
dspcd command at the control terminal. If a card failure is reported, the report remains until cleared. To
clear a card failure, use the switch software resetcd command.
There are two types of resets: hardware and failure. The failure reset clears the event log of any failure
detected by the card self-test and does not disrupt card operation. The hardware reset reboots the
firmware and resets the card, which momentarily disables the card.
Network Trunk Module
Table 2-9 shows supported front and back cards for the network trunk module (NTM).
The NTM enables FastPacket transmission on a trunk established between two IGX nodes. NTM
features include the following:
• Takes FastPackets off the cellbus and places them in queues before transmission to the trunk
• Arbitrates access to the trunk for the traffic type
• Monitors the age of each timestamped FastPacket, updates the timestamp for FastPackets at
intermediate nodes, and discards FastPackets that exceed age limit
• Receives and checks FastPackets from the trunk and queues them for transmission to the cellbus
• Provides packet alignment based on the CRC in the FastPacket header
• Extracts clocking from the trunk that can be used as a clock source on the node or as a clock path
• Collects trunk usage statistics
Table 2-9 Network Trunk Module Front Card and Back Cards
Front Card Back Cards
NTM BC-T1
BC-E1
BC-Y1
BC-SR