Multicast - Fortinet FortiGate Series Administration Manual

Multicast

Multicast
How multicast works
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Networks The IP addresses and network masks of networks to advertise to BGP peers.
The FortiGate unit may have a physical or VLAN interface connected to those
networks.
IP/Netmask Enter the IP address and netmask of the network to be advertised.
Add Add the network information to the Networks list.
Network The IP addresses and network masks of major networks that are advertised to
BGP peers.
Delete icon Delete a BGP network definition.
Note: The get router info bgp CLI command provides detailed information about
configured BGP settings. For a complete list of the command options, see the "router"
chapter of the FortiGate CLI
A FortiGate unit can operate as a Protocol Independent Multicast (PIM) version 2 router in
the root virtual domain. FortiGate units support PIM sparse mode (RFC 2362) and PIM
dense mode (RFC 3973) and can service multicast servers or receivers on the network
segment to which a FortiGate interface is connected.
Multicast server applications use a (Class D) multicast address to send one copy of a
packet to a group of receivers. The PIM routers throughout the network ensure that only
one copy of the packet is forwarded through the network until it reaches an end-point
destination. At the end-point destination, copies of the packet are made only when
required to deliver the information to multicast client applications that request traffic
destined for the multicast address.
Note: To support PIM communications, the sending/receiving applications and all
connecting PIM routers in between must be enabled with PIM version 2. PIM can use static
routes, RIP, OSPF, or BGP to forward multicast packets to their destinations. To support
source-to-destination packet delivery, either sparse mode or dense mode must be enabled
on all the PIM-router interfaces. Sparse mode routers cannot send multicast messages to
dense mode routers. In addition, if a FortiGate unit is located between a source and a PIM
router, or between two PIM routers, or is connected directly to a receiver, you must create a
firewall policy manually to pass encapsulated (multicast) packets or decapsulated data (IP
traffic) between the source and destination.
A PIM domain is a logical area comprising a number of contiguous networks. The domain
contains at least one Boot Strap Router (BSR). If sparse mode is enabled, the domain
also contains a number of Rendezvous Points (RPs) and Designated Routers (DRs).
When you enable PIM on a FortiGate unit, the FortiGate unit can perform any of these
functions at any time as configured. If required for sparse mode operation, you can define
static RPs.
Note: You can configure basic options through the web-based manager. Many additional
options are available, but only through the CLI. For complete descriptions and examples of
how to use CLI commands to configure PIM settings, see multicast in the "router"
chapter of the FortiGate CLI
Note: For more information about FortiGate multicast support, see the
Technical Note or the
Reference.
Reference.
FortiGate Routing Guide.
FortiGate Version 4.0 MR1 Administration Guide
Router Dynamic
FortiGate Multicast
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