Icinga complained today about not be able to reach all the mgmt interfaces of rack `D7` in codfw. The related link on msw1-codfw seems down:
```
Jan 15 06:30:44 msw1-codfw chassism[1399]: ifd_process_flaps IFD: ge-0/0/30, sent flap msg to RE, Downstate
Jan 15 06:30:44 msw1-codfw chassism[1399]: Link status change event: ifd ge-0/0/30 MAC ctrl reg0 :: 0x8BE5, MAC port status reg0 :: 0x6802, MAC auto-neg reg :: 0xB1F4
Jan 15 06:30:44 msw1-codfw chassism[1399]: Link status change event: ifd ge-0/0/30 PHY Link Status: DOWN,LP-AN capable: NO
Jan 15 06:30:44 msw1-codfw chassism[1399]: Link status change event: ifd ge-0/0/30 AN Status: Pending, Speed: 1000 Mbps, Duplex: HALF DUPLEX,Remote Link Fault: NO
Jan 15 06:30:44 msw1-codfw rpd[1422]: EVENT <UpDown> ge-0/0/30.0 index 2147404488 <Broadcast Multicast> address #0 b0.c6.9a.db.5.a1
Jan 15 06:30:44 msw1-codfw rpd[1422]: EVENT <UpDown> ge-0/0/30 index 159 <Broadcast Multicast> address #0 b0.c6.9a.db.5.a1
Jan 15 06:30:44 msw1-codfw mib2d[1421]: SNMP_TRAP_LINK_DOWN: ifIndex 540, ifAdminStatus up(1), ifOperStatus down(2), ifName ge-0/0/30
```
Timing matches with the alarms :)
```
elukey@msw1-codfw> show interfaces ge-0/0/30
Physical interface: ge-0/0/30, Enabled, Physical link is Down
Interface index: 159, SNMP ifIndex: 540
Description: msw-d7-codfw {#10548} [1Gbps Cu]
Link-level type: Ethernet, MTU: 1514, Speed: Auto, Duplex: Auto, BPDU Error: None, MAC-REWRITE Error: None, Loopback: Disabled, Source filtering: Disabled, Flow control: Enabled,
Auto-negotiation: Enabled, Remote fault: Online, Media type: Copper
Device flags : Present Running Down
Interface flags: Hardware-Down SNMP-Traps Internal: 0x0
Link flags : None
CoS queues : 8 supported, 8 maximum usable queues
Current address: b0:c6:9a:db:05:a1, Hardware address: b0:c6:9a:db:05:a1
Last flapped : 2019-01-15 06:30:44 UTC (00:35:31 ago)
Input rate : 0 bps (0 pps)
Output rate : 0 bps (0 pps)
Active alarms : LINK
Active defects : LINK
Interface transmit statistics: Disabled
Logical interface ge-0/0/30.0 (Index 97) (SNMP ifIndex 541)
Flags: Device-Down SNMP-Traps 0x0 Encapsulation: ENET2
Input packets : 7059995
Output packets: 3873668
Protocol eth-switch
Flags: None
{master:0}
elukey@msw1-codfw> show interfaces descriptions ge-0/0/30
Interface Admin Link Description
ge-0/0/30 up down msw-d7-codfw {#10548} [1Gbps Cu]
```