FortiGate PIM-SM debugging examples

Viewing the multicast routing table (FGT-1)

FGT-1 again has some differences with regard to the PIM-SM states, there is no *,G entry because it is not in the path of a receiver and the RP.

FGT-1_master # get router info multicast pim sparse-mode table

IP Multicast Routing Table

(*,*,RP) Entries: 0 (*,G) Entries: 0 (S,G) Entries: 1 (S,G,rpt) Entries: 1

FCR Entries: 0

Below the S,G is the SPT termination because this FortiGate unit is the first hop router, the RPF neighbor always shows as 0.0.0.0 because the source is local to this device. Both the joined and outgoing fields show as external because the PIM join and the stream is egressing on this interface.

(10.166.0.11, 239.255.255.1) RPF nbr: 0.0.0.0

RPF idx: None

SPT bit: 1

Upstream State: JOINED Local:

Joined: external Asserted: Outgoing: external

The stream has been pruned back from the RP because the end-to-end SPT is flowing, there is no requirement for the stream to be sent to the RP in this case.

(10.166.0.11, 239.255.255.1, rpt) RP: 0.0.0.0

RPF nbr: 10.130.0.156

RPF idx: external

Upstream State: RPT NOT JOINED Local:

Pruned: Outgoing:


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Michael Pruett, CISSP has a wide range of cyber-security and network engineering expertise. The plethora of vendors that resell hardware but have zero engineering knowledge resulting in the wrong hardware or configuration being deployed is a major pet peeve of Michael's. This site was started in an effort to spread information while providing the option of quality consulting services at a much lower price than Fortinet Professional Services. Owns PacketLlama.Com (Fortinet Hardware Sales) and Office Of The CISO, LLC (Cybersecurity consulting firm).

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