# Engine Editor > Routing > Multicast Routing

Use this branch to define static multicast, IGMP-based multicast forwarding, or PIM dynamic routing. Only IPv4 addresses are supported.

Option | Definition
--- | ---
Multicast Routing Mode | Specifies how the Security Engine routes multicast traffic. None — Disables multicast routing. Static — Enables options that allow you to add static routes for multicast traffic. IGMP Proxy — Enables options that allow you to use the Security Engine for IGMP-based multicast forwarding. PIM — Enables options that allow you to use the Security Engine for dynamic routing using PIM.

Option | Definition
--- | ---
When Multicast Routing Mode is Static Click Add to add a row to the table, or Remove to remove the selected row.
Source Interface | Select the interface to use for multicast routing.
Source IP Address | Enter the unicast IP address of the multicast source.
Destination IP Address | Enter the multicast destination IP address. The destination address must be within the multicast range of 224.0.0.0 to 239.255.255.255.
Destination Interface | Right-click Destination Interface, then select Edit Destination Interface to select the interfaces where you want this multicast traffic forwarded.
Comment (Optional) | A comment for your own reference.

Option | Definition
--- | ---
When Multicast Routing Mode is IGMP Proxy
Upstream Interface | Select the interface to use as the upstream interface. If the multicast servers and the hosts are in the local networks, or if you want to limit the multicast to the local networks, it is not necessary to define the upstream interface. In that case, leave Not Set selected.
Upstream IGMP Version | Select the IGMP version according to the upstream network environment. The default IGMP version is version 3.
Downstream Interfaces table Click Add to add a row to the table, or Remove to remove the selected row.
Interface | Select the downstream interfaces.
IGMP Querier Settings | Select an IGMP Querier Settings element according to the downstream network environment. The element defines the IGMP version and query parameters.

Option | Definition
--- | ---
When Multicast Routing Mode is PIM
PIM Profile | Select a PIM Profile to use. The profile contains the multicast groups and determines the PIM mode that is used.
Multicast Routing Preference | Note: This option is not supported in this version of Forcepoint Network Security Platform. The routing table is used to specify reverse path forwarding (RPF) information whenever multicast traffic from source addresses uses a different path than unicast traffic from the same source address. Prefer Best Match — The RPF lookup prefers the best match based on both the default routing table and the Multicast routing (mroute) table. Prefer mroute — The RPF lookup uses the mroute table. If the mroute table cannot be used, the default routing table is used.
Bootstrap Settings — see RFC 5059 for more information.
RP Candidate | If you want to use the engine as a rendezvous point (RP) candidate, select an IP address. Otherwise, select Not a Candidate.
RP Priority | Enter a value for the RP priority.
Multicast Groups | Add the multicast IPv4 networks for which the engine acts as an RP candidate. Click Add to add a row to the table, or Remove to remove the selected row.
BSR Candidate | If you want to use the engine as a bootstrap router (BSR) candidate, select an IP address. Otherwise, select Not a Candidate.
BSR Priority | Enter a value for the BSR priority.