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Dell EMC Configuration Guide for the S4048T–ON System 9.14.2.4

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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 EMC Networking OS does not process Internet group management protocol (IGMP) or multicast listener discovery protocol (MLD) joins to protocol-independent multicast (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 multicast source discovery protocol (MSDP).

  • If you increase the limit after it is reached, subsequent join requests are accepted. In this case, increase the limit by at least 10% for IGMP and MLD to resume.
  • If you decrease the limit after it is reached, the Dell EMC Networking OS does not clear the existing sessions. Entries are cleared after a timeout (you may also clear entries using the clear ip mroute command).
NOTE The Dell EMC 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 following displays:
      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 is from 1 to 16000.
The default is 4000.
NOTE The IN-L3-McastFib CAM partition stores multicast routes and is a separate hardware limit that exists per port-pipe. Any software-configured limit may supersede this hardware space limitation. The opposite is also true, the CAM partition might not be exhausted at the time the system-wide route limit is reached using the ip multicast-limit command.

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