2xEX2300 VC: fpc0 ifd null, port 28 / dc-pfe: ifd null, port 28 what does these messages mean?

Hi,

I have a 2xEX2300-48p virtual-chassi that sends these syslog messages 24/7 (around 128K per day):

Mar  8 15:06:11 *hostname* dc-pfe: ifd null, port 29
Mar  8 15:06:11 *hostname* fpc0 ifd null, port 29
Mar  8 15:06:15 *hostname* dc-pfe: ifd null, port 28
Mar  8 15:06:15 *hostname* fpc0 ifd null, port 28
Mar  8 15:06:16 *hostname* dc-pfe: ifd null, port 28
Mar  8 15:06:16 *hostname* fpc0 ifd null, port 28
Mar  8 15:06:17 *hostname* dc-pfe: ifd null, port 29
Mar  8 15:06:17 *hostname* fpc0 ifd null, port 29
Mar  8 15:06:17 *hostname* dc-pfe: ifd null, port 28
Mar  8 15:06:17 *hostname* fpc0 ifd null, port 28
Mar  8 15:06:18 *hostname* dc-pfe: ifd null, port 29
Mar  8 15:06:18 *hostname* fpc0 ifd null, port 29
Mar  8 15:06:19 *hostname* dc-pfe: ifd null, port 29
Mar  8 15:06:19 *hostname* fpc0 ifd null, port 29
Mar  8 15:06:24 *hostname* dc-pfe: ifd null, port 28
Mar  8 15:06:24 *hostname* fpc0 ifd null, port 28
Mar  8 15:06:25 *hostname* dc-pfe: ifd null, port 28
Mar  8 15:06:25 *hostname* fpc0 ifd null, port 28
Mar  8 15:06:25 *hostname* dc-pfe: ifd null, port 29
Mar  8 15:06:25 *hostname* fpc0 ifd null, port 29
Mar  8 15:06:26 *hostname* dc-pfe: ifd null, port 28
Mar  8 15:06:26 *hostname* fpc0 ifd null, port 28
Mar  8 15:06:26 *hostname* dc-pfe: ifd null, port 29
Mar  8 15:06:26 *hostname* fpc0 ifd null, port 29
Mar  8 15:06:27 *hostname* dc-pfe: ifd null, port 29
Mar  8 15:06:27 *hostname* fpc0 ifd null, port 29
Mar  8 15:06:32 *hostname* dc-pfe: ifd null, port 28
Mar  8 15:06:32 *hostname* fpc0 ifd null, port 28
Mar  8 15:06:33 *hostname* dc-pfe: ifd null, port 28
Mar  8 15:06:33 *hostname* fpc0 ifd null, port 28
Mar  8 15:06:33 *hostname* dc-pfe: ifd null, port 29
Mar  8 15:06:33 *hostname* fpc0 ifd null, port 29
Mar  8 15:06:34 *hostname* dc-pfe: ifd null, port 28
Mar  8 15:06:34 *hostname* fpc0 ifd null, port 28
Mar  8 15:06:34 *hostname* dc-pfe: ifd null, port 29
Mar  8 15:06:34 *hostname* fpc0 ifd null, port 29
Mar  8 15:06:35 *hostname* dc-pfe: ifd null, port 29
Mar  8 15:06:35 *hostname* fpc0 ifd null, port 29

What on earth does it mean?

show interface ifd-index 28:

root@hostname> show interfaces ifd-index 28
  Logical interface .local..0 (Index 0) (SNMP ifIndex 0)
    Flags: Down Point-To-Point Encapsulation: Unspecified
    Protocol inet, MTU: Unlimited
      Flags: None
      Addresses, Flags: Is-Primary
        Local: 10.1.1.4
    Protocol iso, MTU: Unlimited
      Flags: None
    Protocol inet6, MTU: Unlimited
    Max nh cache: 0, New hold nh limit: 0, Curr nh cnt: 0, Curr new hold cnt: 0, NH drop cnt: 0
      Flags: None
    Protocol mpls, MTU: Unlimited, Maximum labels: 3
      Flags: None
    Protocol eth-switch, MTU: Unlimited
      Flags: None
    Protocol 56, MTU: Unlimited
      Flags: None
    Protocol 57, MTU: Unlimited
      Flags: None
    Protocol 60, MTU: Unlimited
      Flags: None
    Protocol 61, MTU: Unlimited
      Flags: None

show interface ifd-index 29:

root@hostname> show interfaces ifd-index 29
  Logical interface .local..0 (Index 0) (SNMP ifIndex 0)
    Flags: Down Point-To-Point Encapsulation: Unspecified
    Protocol inet, MTU: Unlimited
      Flags: None
      Addresses, Flags: Is-Primary
        Local: 10.1.1.4
    Protocol iso, MTU: Unlimited
      Flags: None
    Protocol inet6, MTU: Unlimited
    Max nh cache: 0, New hold nh limit: 0, Curr nh cnt: 0, Curr new hold cnt: 0, NH drop cnt: 0
      Flags: None
    Protocol mpls, MTU: Unlimited, Maximum labels: 3
      Flags: None
    Protocol eth-switch, MTU: Unlimited
      Flags: None
    Protocol 56, MTU: Unlimited
      Flags: None
    Protocol 57, MTU: Unlimited
      Flags: None
    Protocol 60, MTU: Unlimited
      Flags: None
    Protocol 61, MTU: Unlimited
      Flags: None

my irb.500 interface, which I use for management has IP 10.1.1.4.

root@hostname> show interfaces irb.500
  Logical interface irb.500 (Index 651) (SNMP ifIndex 717)
    Flags: Up SNMP-Traps 0x4004000 Encapsulation: ENET2
    Bandwidth: 1000mbps
    Routing Instance: default-switch Bridging Domain: MGMT-INTERNAL
    Input packets : 224490
    Output packets: 6157558
    Protocol inet, MTU: 1500
      Flags: Sendbcast-pkt-to-re, Is-Primary
      Addresses, Flags: Is-Default Is-Preferred Is-Primary
        Destination: 10.1.1/24, Local: 10.1.1.4, Broadcast: 10.1.1.255

How do I stop these messages from being generated? And if I can't and there's nothing to worry about, how do I stop them from being sent to my syslog server?

thanks in advance

best regards,

Peter