Routes received from another AS marked as IGP

[Marcio]

Dear,

I have a topology where each AS is represented by a BIRD router. But in the
BIRD table of the routers. The announcements received are marked as IGP but
all the BGP sessions are done between different ASes. Do you know why it
occur? Follow an example about a prefix announced by two different ASes and
marked as IGP origin in a third one.

10.3.1.0/24          unicast [SDNRTR 13:18:10.201] * (100) [AS65507i]
        via 192.168.1.1 on eth0
        Type: BGP univ
        BGP.origin: *IGP*
        BGP.as_path: 65507
        BGP.next_hop: 192.168.1.1
        BGP.local_pref: 100
                     unicast [R6 21:25:23.642] (100) [AS65501i]
        via 192.168.7.2 on eth1
        Type: BGP univ
        BGP.origin: *IGP*
        BGP.as_path: 65501
        BGP.next_hop: 192.168.7.2
        BGP.local_pref: 100
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