Information About Sup-region TCAM Monitoring
The Sup-region Ternary Content-Addressable Memory (TCAM) Monitoring feature is a monitoring mechanism that enables detection, reporting and correction of sup‐region TCAM entry corruption. This monitoring mechanism provides the following functionalities:
Detection—Checks for corruptions in any sup-region TCAM entry and reports it.
Correction—Provides corrective mechanism to rewrite the corrupted sup-region TCAM entry.
On-demand Detection of Corrupted Sup-region TCAM Entries
Use the hardware sup-tcam monitoring trigger-detection command to verify if any sup-region TCAM entry is corrupted. This command triggers a verification iteration that involves reading each sup-region TCAM entry and comparing this TCAM entry data with the stored content.
Periodic Detection of Corrupted Sup-region TCAM Entries
By default, the periodic sup-region TCAM entry corruption detection mechanism is disabled. Use the hardware sup-tcam monitoring enable command to enable periodic sup-region TCAM entry corruption detection. By default, the periodic corruption detection mechanism is set to run once every 1440 minutes or 1 day.
A syslog is generated if any sup-region TCAM entry is found to be corrupt. This syslog entry has details about the TCAM entry index, ASIC and slot number.
In-Service Software Upgrades and In-Service Software Downgrades
The sup-region TCAM entry monitoring mechanism tracks the content of the programmed TCAM entry by storing the TCAM entry content in the Persistent Storage Service (PSS). After a non-disruptive In-Service Software Upgrade (ISSU), this content is restored for verification. Before an ISSU is done, all configurations will be stored in the PSS. Statistics are not stored in the PSS.
You cannot restore a sup-region TCAM entry after a non-disruptive ISSU from a Cisco NX-OS version on which sup-region TCAM monitoring is not supported to a Cisco NX-OS version on which sup-region TCAM monitoring is supported. During such a scenario, syslogs are not generated for any corrupted sup-region TCAM entries and all commands related to sup-region TCAM monitoring will be disabled. You have to then reload the switch to trigger sup-region TCAM monitoring.
The Sup-region TCAM Monitoring feature does not support In-Service Software Downgrade (ISSD). Disable the Sup-region TCAM Monitoring feature before performing an ISSD.