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Data MDTs and Tunnel Services PIC Limits

When configuring multicast over VPNs according to Internet draft draft-rosen-vpn-mcast-07.txt, Multicast in MPLS/BGP IP VPNs, each Tunnel Services PIC supports 512 multicast tunnel (mt-) interfaces. Configuring a router to allow more than 512 multicast tunnels requires another Tunnel Services PIC. Both default and data MDTs contribute to this total.

There are typically two default multicast tunnels (one for encapsulation and the other for de-encapsulation). If a router with a single Tunnel Services PIC creates more than 512 default and data MDTs, no traffic will flow for multicast tunnels created in excess of 512.

For example, configuring a router to allow 500 data MDTs requires only a single Tunnel Services PIC (500 + 2 = 502). However, configuring a router to allow 1000 data MDTs requires two Tunnel Services PICs (1000 + 2 = 1002). Up to 1024 multicast tunnels are supported with two Tunnel Services PICs.

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

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