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 router has a Tunnel Services PIC, the Junos OS automatically configures one multicast tunnel interface (mt) for each virtual private network (VPN) you configure. You do not need to configure multicast tunnel interfaces. |
