Dell EMC SmartFabric OS10 User Guide Release 10.5.0

Deployment considerations

Dell EMC recommends the following:

• In a VLT-enabled PIM router, multicast routing is not supported when there are multiple PIM spanned paths to reach the source or RP. Configure only one PIM spanned path to reach any PIM router in the aggregation or spine.
• If a source is connected to a nonspanned interface of the VLT peer nodes and the RP is reachable on a spanned interface from both the VLT nodes, the receiver might receive duplicate traffic. To avoid duplicate traffic, configure the source to be reachable on a spanned interface.
• For better convergence, the upstream incoming interface (IIF) and the downstream outgoing interface (OIF) must be a spanned VLAN.
• In VLT deployments, Dell EMC recommends not to change the PIM designated router by configuring a non-default value using the ip pim dr-priority command.
• In large-scale multicast deployments, you might see frequent bursts of multicast control traffic. For such deployments, Dell EMC recommends that you increase the burst size for queue 2 on all PIM routers using control-plane policing. For more information on how to configure a QoS policy to rate limit control-plane traffic, see Configure control-plane policing.