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Dell PowerEdge FN I/O Module Configuration Guide 9.10(0.0)

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Limiting the Number of Multicast Routes

When the total number of multicast routes on a system limit is reached, the Dell Networking OS does not process any IGMP or multicast listener discovery protocol (MLD) joins to PIM — though it still processes leave messages — until the number of entries decreases below 95% of the limit.

When the limit falls below 95% after hitting the maximum, the system begins relearning route entries through IGMP, MLD, and MSDP.
  • If the limit is increased after it is reached, join subsequent join requests are accepted. In this case, increase the limit by at least 10% for IGMP and MLD to resume.
  • If the limit is decreased after it is reached, the system does not clear the existing sessions. Entries are cleared after a timeout (you may also clear entries using clear ip mroute).
  • NOTE: The Dell Networking OS waits at least 30 seconds between stopping and starting IGMP join processing. You may experience this delay when manipulating the limit after it is reached.
When the multicast route limit is reached, the system displays the following: 
      3w1d13h: %RPM0-P:RP2 %PIM-3-PIM_TIB_LIMIT: PIM TIB limit reached. No new routes will
                                    be learnt until TIB level falls below low watermark.
                                    3w1d13h: %RPM0-P:RP2 %PIM-3-PIM_TIB_LIMIT: PIM TIB below low watermark. Route learning
                                    will begin.

To limit the number of multicast routes, use the following command.

Limit the total number of multicast routes on the system. CONFIGURATION mode ip multicast-limit The range if from 1 to 50000. The default is 15000.
  • NOTE: The IN-L3-McastFib CAM partition is used to store multicast routes and is a separate hardware limit that exists per port-pipe. Any software-configured limit may supersede by this hardware space limitation. The opposite is also true, the CAM partition might not be exhausted at the time the system-wide route limit the ip multicast-limit command sets is reached.

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