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A Cat9200 may see multiple symptoms related to traffic forwarding, including but not limited to: 1. Interface counters do not increment but traffic is forwarded 2. General MAC learning issues: new MACs will not be learned existing MACs will not be aged out MAC moves wont be updated. 3. Total packet loss to specific hosts in remote subnets The above symptoms are the most common seen in the field, but other issues related to traffic forwarding or instability may exist as well.
This is specific to Catalyst 9200L/9200 platforms running 16.12.1 or 16.12.2 or 16.12.3 or 17.1.1 or 17.2.1 versions after 7 weeks of uptime. Non-9200 based Catalyst platforms will NOT see this issue.
A reload will temporarily resolve the issue but it is expected to return after 7 weeks of uptime.
Note - The trigger for this issue is strictly uptime related. 100% of vulnerable switches will hit this defect after 49+ days of uptime. The impact may vary depending on the features you have configured, however the switch will have at least one issue after this date. The fix for this defect is available in 16.12.4 and later versions, and in 17.3.x and beyond. Also, Reload SMU (Software Maintenance Upgrade) patching for this defect is available for 16.12.1, 16.12.2 and 16.12.3. PSIRT Evaluation: The Cisco PSIRT has evaluated this issue and determined it does not meet the criteria for PSIRT ownership or involvement. This issue will be addressed via normal resolution channels. If you believe that there is new information that would cause a change in the severity of this issue, please contact psirt@cisco.com for another evaluation. Additional information on Cisco's security vulnerability policy can be found at the following URL: http://www.cisco.com/en/US/products/products_security_vulnerability_policy.html
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