Troubleshooting Traffic Flow Between Line Cards
Question
An engineer sees that traffic is not flowing between two line cards on a Cisco ASR 9000 Series device.
To troubleshoot this issue, what should the engineer do first?
Answers
Explanations
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When traffic is not flowing between two line cards on a Cisco ASR 9000 Series device, the first step in troubleshooting is to isolate the cause of the issue by checking the most likely points of failure. The following steps can help you identify and resolve the issue:
Step 1: Verify physical connectivity Check the physical connectivity between the two line cards. Ensure that the cables are properly connected, the interfaces are enabled, and the link status is up. If there is a physical problem with the connectivity, resolve it before proceeding to the next step.
Step 2: Verify whether there are errors on the EOBCs EOBC (Embedded Operations Channel) is the channel used for internal communication between the line cards and the Route Switch Processor (RSP) on the Cisco ASR 9000 Series device. If there are errors on the EOBCs, it may prevent traffic from flowing between the line cards. Use the show controllers ethernet-controller eobc command to check for any errors on the EOBCs.
Step 3: Verify whether there are PFM alarms on the line cards and RSPs PFM (Processor Fault Management) alarms on the line cards and RSPs may cause traffic interruption between the line cards. Use the show platform command to check for any PFM alarms.
Step 4: Verify whether LPTS configuration is prohibiting traffic between the two line cards Line-Card Packet Transport System (LPTS) configuration may prevent traffic from flowing between line cards. Use the show running-config all | include lpts command to check if there is any LPTS configuration that may be causing the issue.
Step 5: Verify whether there are alarms in the system diagnostics Finally, use the show platform command to check for any system diagnostic alarms that may be related to the issue. If there are any alarms, troubleshoot them accordingly.
In conclusion, the first step to troubleshoot traffic flow issues between two line cards on a Cisco ASR 9000 Series device is to verify physical connectivity, and then proceed to check for errors on the EOBCs, PFM alarms, LPTS configuration, and system diagnostic alarms.
