ldpd hello的处理流程

发的是hello报文，走到

ns3::UdpSocketImpl::SendTo (this=0x7fffdc006200, p=..., flags=64, address=...) at ../src/internet/model/udp-socket-impl.cc:823
823      NS_LOG_FUNCTION (this << p << flags << address);
(gdb)

(gdb) p ipv4
$19 = {m_address = 3758096386}
(gdb)

这是组播地址224.0.0.2

(gdb) p port
$20 = 646
(gdb)

这是hello报文端口。