Bandwidth monitoring is supported on single IOMs, that is, both the active and the backup PMSI terminate on the same IOM. The IOM monitors the statistics of both PMSIs and makes the switchover decision. The IOM does not include the CPM in any of the bandwidth monitoring decisions, which ensures fast detection times and switchover times under 50 ms.
All leaf and bud nodes must be configured with the same UMH PEs, I-PMSI and S-PMSI, and bandwidth threshold configuration to avoid traffic drops.
All LAG members must be in the same IOM that is performing the bandwidth monitoring function. The LAG interfaces spanning between multiple port members that belong to different IOMs have an unpredictable behavior, including traffic duplication.