Enable multicast routing

Enable multicast routing to allow the device to forward multicast traffic using Internet Group Management Protocol (IGMP) and Protocol Independent Multicast (PIM) protocols on all interfaces.

Enabling multicast routing on the Firewall Threat Defense device, enables IGMP and PIM on all interfaces by default. IGMP is used to learn whether members of a group are present on directly attached subnets. Hosts join multicast groups by sending IGMP report messages. PIM is used to maintain forwarding tables to forward multicast datagrams.

Note

Only the UDP transport layer is supported for multicast routing.

These are the maximum number of entries for specific multicast tables. Any new entries are discarded when these limits are reached.

  • Multicast Forwarding Information Base (MFIB): 30,000

  • IGMP Groups: 30,000

  • PIM Routes: 72,000

Procedure

Step 1

Choose Devices > Device Management, and edit the Firewall Threat Defense device.

Step 2

Choose Routing > Multicast Routing > IGMP.

Step 3

Check the Enable Multicast Routing check box.

Checking this check box enables IP multicast routing on the device. Unchecking it disables IP multicast routing. By default, multicast is disabled. Enabling multicast routing enables multicast on all interfaces.

You can disable multicast on a per-interface basis. This is useful if you know that there are no multicast hosts on a specific interface and you want to prevent the Firewall Threat Defense device from sending host query messages on that interface.