Symptom

Symptoms: + Upgrade attempted from Cisco NX-OS Release 9.2(2) to Cisco NX-OS Release 9.3(1) using ISSU. (Same issue seen even with cold boot) + Device goes into a boot loop infinitely and dumps mrib Cores (Need to break it at loader and load 9.2.2 to recover) + When we remove feature PIM and perform the upgrade from Cisco NX-OS Release 9.2(2) and Cisco NX-OS Release 9.3(1), we have no issues + As soon as we apply feature PIM on Cisco NX-OS Release 9.3(1), device reloads with a core.

Conditions

This issue is that both MRIB and PIM need to increase in size by u4route-mem and u6route-mem, which in this case is 1.25 GB. This takes the address-space beyond the 4GB limit.

Workaround

Issue was not found to occur when u4route-mem + u6route-mem is <= 1 GB. 750MB is recommended as a safe upper limit.

Further Problem Description