Logs I gathered from 'show log messages' on EX4300 right when event happened.
Code:
Oct 17 12:20:59 ex4300sw last message repeated 2 times
Oct 17 12:20:59 ex4300sw jdhcpd: DH_SVC_SENDMSG_FAILURE: sendmsg() from 0.0.0.0 to port 67 at 255.255.255.255 via interface 547 and routing instance default failed: Network is down
Oct 17 12:21:03 ex4300sw jdhcpd: DH_SVC_SENDMSG_FAILURE: sendmsg() from 0.0.0.0 to port 67 at 255.255.255.255 via interface 547 and routing instance default failed: Network is down
Oct 17 12:21:11 ex4300sw jdhcpd: DH_SVC_SENDMSG_FAILURE: sendmsg() from 0.0.0.0 to port 67 at 255.255.255.255 via interface 547 and routing instance default failed: Network is down
Oct 17 12:21:15 ex4300sw jdhcpd: DH_SVC_SENDMSG_FAILURE: sendmsg() from 0.0.0.0 to port 67 at 255.255.255.255 via interface 5 and routing instance default failed: Network is down
Oct 17 12:21:27 ex4300sw jdhcpd: DH_SVC_SENDMSG_FAILURE: sendmsg() from 0.0.0.0 to port 67 at 255.255.255.255 via interface 547 and routing instance default failed: Network is down
Oct 17 12:21:47 ex4300sw jdhcpd: DH_SVC_SENDMSG_FAILURE: sendmsg() from 0.0.0.0 to port 67 at 255.255.255.255 via interface 5 and routing instance default failed: Network is down
Oct 17 12:21:59 ex4300sw jdhcpd: DH_SVC_SENDMSG_FAILURE: sendmsg() from 0.0.0.0 to port 67 at 255.255.255.255 via interface 547 and routing instance default failed: Network is down
Oct 17 12:22:51 ex4300sw jdhcpd: DH_SVC_SENDMSG_FAILURE: sendmsg() from 0.0.0.0 to port 67 at 255.255.255.255 via interface 5 and routing instance default failed: Network is down
Oct 17 12:23:03 ex4300sw last message repeated 2 times
Oct 17 12:23:03 ex4300sw jdhcpd: DH_SVC_SENDMSG_FAILURE: sendmsg() from 0.0.0.0 to port 67 at 255.255.255.255 via interface 547 and routing instance default failed: Network is down
Oct 17 12:23:07 ex4300sw jdhcpd: DH_SVC_SENDMSG_FAILURE: sendmsg() from 0.0.0.0 to port 67 at 255.255.255.255 via interface 547 and routing instance default failed: Network is down
Oct 17 12:23:15 ex4300sw jdhcpd: DH_SVC_SENDMSG_FAILURE: sendmsg() from 0.0.0.0 to port 67 at 255.255.255.255 via interface 547 and routing instance default failed: Network is down
Oct 17 12:23:19 ex4300sw jdhcpd: DH_SVC_SENDMSG_FAILURE: sendmsg() from 0.0.0.0 to port 67 at 255.255.255.255 via interface 5 and routing instance default failed: Network is down
Oct 17 12:23:31 ex4300sw jdhcpd: DH_SVC_SENDMSG_FAILURE: sendmsg() from 0.0.0.0 to port 67 at 255.255.255.255 via interface 547 and routing instance default failed: Network is down
Oct 17 12:23:51 ex4300sw jdhcpd: DH_SVC_SENDMSG_FAILURE: sendmsg() from 0.0.0.0 to port 67 at 255.255.255.255 via interface 5 and routing instance default failed: Network is down
Oct 17 12:24:03 ex4300sw jdhcpd: DH_SVC_SENDMSG_FAILURE: sendmsg() from 0.0.0.0 to port 67 at 255.255.255.255 via interface 547 and routing instance default failed: Network is down
Oct 17 12:24:55 ex4300sw jdhcpd: DH_SVC_SENDMSG_FAILURE: sendmsg() frOct 17 12:27:54 ex4300sw eventd[893]: SYSTEM_OPERATIONAL: System is operational
Oct 17 12:27:55 ex4300sw /kernel: Copyright (c) 1996-2016, Juniper Networks, Inc.
Oct 17 12:27:55 ex4300sw /kernel: All rights reserved.
Oct 17 12:27:55 ex4300sw /kernel: Copyright (c) 1992-2007 The FreeBSD Project.
Oct 17 12:27:55 ex4300sw /kernel: Copyright (c) 1979, 1980, 1983, 1986, 1988, 1989, 1991, 1992, 1993, 1994
Oct 17 12:27:55 ex4300sw /kernel: The Regents of the University of California. All rights reserved.
Oct 17 12:27:55 ex4300sw /kernel: FreeBSD is a registered trademark of The FreeBSD Foundation.
Oct 17 12:27:55 ex4300sw /kernel: JUNOS 14.1X53-D40.8 #0: 2016-11-09 04:54:19 UTC
Oct 17 12:27:55 ex4300sw /kernel: builder@singlath.juniper.net:/volume/build/junos/14.1/service/14.1X53-D40.8/obj-powerpc/junos/bsd/kernels/JUNIPER-EX-4300/kernel
Oct 17 12:27:55 ex4300sw /kernel: Timecounter "decrementer" frequency 18750000 Hz quality 0
Oct 17 12:27:55 ex4300sw /kernel: cpu0: Freescale e500mc core revision 3.2
Oct 17 12:27:55 ex4300sw /kernel: cpu0: HID0 c0000080<EMCP,EN_L2MMU_MHD,EN_MAS7_UPDATE>
Oct 17 12:27:55 ex4300sw /kernel: real memory = 1992294400 (1900 MB)
Oct 17 12:27:55 ex4300sw /kernel: avail memory = 1949667328 (1859 MB)
Oct 17 12:27:55 ex4300sw /kernel: Security policy loaded: Junos MAC/veriexec (mac_veriexec)
Oct 17 12:27:55 ex4300sw /kernel: Security policy loaded: JUNOS MAC/pcap (mac_pcap)
Oct 17 12:27:55 ex4300sw /kernel: Security policy loaded: JUNOS MAC/runasnonroot (mac_runasnonroot)
Oct 17 12:27:55 ex4300sw /kernel: MAC/veriexec fingerprint module loaded: SHA256
Oct 17 12:27:55 ex4300sw /kernel: MAC/veriexec fingerprint module loaded: SHA1
Oct 17 12:27:55 ex4300sw /kernel: ETHERNET SOCKET BRIDGE initialising
Oct 17 12:27:55 ex4300sw /kernel: Initializing EXSERIES properties ...
Oct 17 12:27:55 ex4300sw /kernel: nexus0: <Powerpc Nexus device>
Oct 17 12:27:55 ex4300sw /kernel: ocpbus0: <on-chip peripheral bus> on nexus0
Oct 17 12:27:55 ex4300sw /kernel: openpic0: <OpenPIC in on-chip peripheral bus> iomem 0xfe040000-0xfe06ffff on ocpbus0
Oct 17 12:27:55 ex4300sw /kernel: lbc0: <Freescale Local Bus Controller> iomem 0xfe124000-0xfe12410f,0xff000000-0xffffffff irq 41 on ocpbus0