Restricting Tunnels to Multicast Traffic

For interfaces that carry IPv4 or IP version 6 (IPv6) traffic, you can configure a tunnel interface to allow multicast traffic only. To configure a multicast-only tunnel, include the multicast-only statement:

You can configure this statement at the following hierarchy levels:

• [edit interfaces interface-name unit logical-unit-number family family]
• [edit logical-systems logical-system-name interfaces interface-name unit logical-unit-number family family]

Multicast tunnels filter all unicast packets; if an incoming packet is not destined for a 224/8 or greater prefix, the packet is dropped and a counter is incremented.

You can configure this property on GRE, IP-IP, PIM, and multicast tunnel (mt) interfaces only.

Note: If your routing platform has a Tunnel Services PIC, the JUNOS software automatically configures one multicast tunnel interface (mt) for each virtual private network (VPN) you configure. You do not need to configure multicast tunnel interfaces.