PIM vs multicast forwarding

Forum|Forum|4 years ago
May 27, 2022
4 replies
3511 views

One firewall in my LAN is configured with PIM dense mode and wish to communicate with another firewall ( same model Fortigate 600D) but configured with multicast forwarding. Can the first node PIM enabled able to transfer and receive multicast traffic with the second one? and how? If I set the first one in PIM dense passive mode can I resolve the problem?

FortiGate

Best answer by vponmuniraj

Hi,

Multicast forwarding allows multicast traffic forwarded from an interface towards an interface configured in the multicast policy.

PIM Dense mode would need a active PIM neighbor. Depending on the setup, you might need to configure PIM dense mode on your 600D to forward multicast traffic.

Regards,

A

Anonymous_User

Contributor III

Hello @pbarbieri ,

Thank you for using the Community Forum. I will seek to get you an answer or help. We will reply to this thread with an update as soon as possible.

Thanks,

Fortinet Community Team

alif

Staff

Hi @pbarbieri,

Please create a multicast policy on Fortigate to allow encapsulated (multicast) packets or decapsulated data (IP traffic).

Please refer to the following links for deails:

https://docs.fortinet.com/document/fortigate/6.4.5/administration-guide/896987/multicast-routing-and-pim-support

https://docs.fortinet.com/document/fortigate/6.4.5/administration-guide/968606/configuring-multicast-forwarding

pbarbieriAuthor

Visitor III

Thank you very much for you reply. I am already using GRE to encapulated and decapsulated multicast packets. what it happens is that from no PIM node (multicast forwarding) the PIM enabled node receive correctly multicast packets, but not viceversa. I guess that the PIM enabled node attend the PIM join and refresh state packets from remote node to deliver to it the multicast packets, this is part of the protocol. I wondered if I can use a shortcut to force PIM enable node to send anyway multicast packet outside independently.

vponmunirajAnswer

Staff

Hi,

Multicast forwarding allows multicast traffic forwarded from an interface towards an interface configured in the multicast policy.

PIM Dense mode would need a active PIM neighbor. Depending on the setup, you might need to configure PIM dense mode on your 600D to forward multicast traffic.

Regards,

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