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Limiting the Maximum Number of Data MDTs

The PE router implementing a data MDT for a local multicast source must establish a limit for the number of data MDTs created in this VRF instance. If the limit is 0 (the default), then no data MDTs are created for this VRF instance.

To configure the data MDT limit, include the tunnel-limit statement:




tunnel-limit limit;

You can include this statement at the following hierarchy levels:

[edit routing-instances routing-instance-name protocols pim mdt]
[edit logical-systems logical-system-name routing-instances routing-instance-name protocols pim mdt]
[edit routing-instances routing-instance-name provider-tunnel mdt]
[edit logical-systems logical-system-name routing-instances routing-instance-name provider-tunnel mdt]

The valid range is from 0 through 1024 for a VRF instance. There is a limit of 8000 tunnels for all data MDTs in all VRF instances on a PE router.

M-series and T-series routers that are connected to a source site require a Tunnel Services PIC to support multicast tunnel (mt) interfaces. MX-series routers do not require Tunnel Services PICs.

A Tunnel Services PIC supports a maximum of 512 multicast tunnel interfaces. Both default and data MDTs contribute to this total. The default MDT uses two multicast tunnel interfaces (one for encapsulation and one for de-encapsulation). To enable an M-series or T-series router to support more than 512 multicast tunnel interfaces, another Tunnel Services PIC is required.

For more information about Tunnel Services PICs and multicast tunnels, see Tunnel Services PICs and Multicast.

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