This KB explains incrementing errors on igb0 interface
Incrementing Input and Output errors on igb0 interface on MX480
Customer reported errors on igb0 as below: >>>
{master}
root@router> show interfaces igb0 extensive | match error
Input errors:
Errors: 168312570388967424, Drops: 0, Framing errors: 0, Runts: 0, Giants: 0, Policed discards: 0, Resource errors: 0
Output errors:
Carrier transitions: 0, Errors: 1003711671, Drops: 0, MTU errors: 0, Resource errors: 0
root@router> show interfaces igb0 extensive
Physical interface: igb0, Enabled, Physical link is Up
Interface index: 65, SNMP ifIndex: 513, Generation: 2
Type: Ethernet, Link-level type: Ethernet, MTU: 1514, Clocking: Unspecified, Speed: 1000mbps
Device flags : Present Running
Interface Specific flags: Internal: 0x100200
Interface flags: SNMP-Traps
Link type : Full-Duplex
Link flags : 0x4
Physical info : Unspecified
Hold-times : Up 0 ms, Down 0 ms
Damping : half-life: 0 sec, max-rootppress: 0 sec, reuse: 0, rootppress: 0, state: unrootppressed
Current address: 02:00:01:00:00:04, Hardware address: 02:00:01:00:00:04
Alternate link address: Unspecified
Last flapped : 2025-11-29 00:40:47 IST (48w0d 11:08 ago)
Statistics last cleared: 2026-07-08 09:24:40 IST (16w3d 02:24 ago)
Traffic statistics:
Input bytes : 3732379020
Output bytes : 792847509284
Input packets: 39667377
Output packets: 991059503
IPv6 transit statistics:
Input bytes : 0
Output bytes : 0
Input packets: 0
Output packets: 0
Errors: 168351978918014976, Drops: 0, Framing errors: 0, Runts: 0, Giants: 0, Policed discards: 0, Resource errors: 0
Carrier transitions: 0, Errors: 1003946679, Drops: 0, MTU errors: 0, Resource errors: 0
Logical interface igb0.0 (Index 5) (SNMP ifIndex 514) (Generation 4)
Flags: Up SNMP-Traps 0x4000000 Encaprootlation: ENET2
Output bytes : 792542662546
Output packets: 991056632
IPv6 total statistics:
Local statistics:
Protocol inet, MTU: 1500
Max nh cache: 75000, New hold nh limit: 75000, Curr nh cnt: 3, Curr new hold cnt: 0, NH drop cnt: 0
Generation: 142, Route table: 1
Flags: Is-Primary
Addresses, Flags: Is-Preferred
Destination: 10/8, Local: 10.0.0.4, Broadcast: 10.255.255.255, Generation: 3
Addresses, Flags: Preferred Kernel Is-Preferred
Destination: 128/2, Local: 128.0.0.1, Broadcast: 191.255.255.255, Generation: 13
Addresses, Flags: Primary Is-Default Is-Primary
Destination: 128/2, Local: 128.0.0.4, Broadcast: 191.255.255.255, Generation: 2
Protocol inet6, MTU: 1500
Max nh cache: 75000, New hold nh limit: 75000, Curr nh cnt: 2, Curr new hold cnt: 0, NH drop cnt: 0
Generation: 143, Route table: 1
Addresses, Flags: Is-Preferred 0x800
Destination: fe80::/64, Local: fe80::200:1ff:fe00:4
INET6 Address Flags: None
Broadcast: Unspecified, Generation: 4
Addresses, Flags: Is-Default Is-Preferred Is-Primary
Destination: fec0::/64, Local: fec0::a:0:0:4
Broadcast: Unspecified, Generation: 5
Protocol tnp, MTU: 1500, Generation: 144, Route table: 1
Flags: None
Addresses, Flags: None
Destination: Unspecified, Local: 0x4, Broadcast: Unspecified, Generation: 6
root@router> show system uptime no-forwarding
Current time: 2026-10-31 12:14:28 IST
Time Source: NTP CLOCK
System booted: 2025-11-29 00:40:37 IST (48w0d 11:33 ago)
Protocols started: 2025-11-29 00:42:16 IST (48w0d 11:32 ago)
Last configured: 2026-10-27 01:16:41 IST (4d 10:57 ago) by rajesht
12:14PM up 336 days, 11:34, 2 users, load averages: 0.20, 0.30, 0.31
root@router> show version detail no-forwarding
Hostname: router
Model: mx480
Family: junos
Junos: 24.2R2-S1.6
JUNOS OS Kernel 64-bit [20250404.74caf3f_builder_bsd15_242]
JUNOS OS libs compat32 [20250404.74caf3f_builder_bsd15_242]
JUNOS OS libs [20250404.74caf3f_builder_bsd15_242]
root@router> show system core-dumps no-forwarding
/var/crash/*core*: No rootch file or directory
/var/tmp/*core*: No rootch file or directory
/var/tmp/pics/*core*: No rootch file or directory
/var/crash/kernel.*: No rootch file or directory
/var/jails/rest-api/tmp/*core*: No rootch file or directory
/tftpboot/corefiles/*core*: No rootch file or directory
root@router> show chassis alarms no-forwarding
No alarms currently active
root@router> show chassis hardware detail no-forwarding
Hardware inventory:
Item Version Part number Serial number Description
Chassis JN1260B31AFB MX480
Midplane REV 40 750-047862 ACRJ7418 Enhanced MX480 Midplane
FPM Board REV 04 760-059208 CAJF2564 Front Panel Display
PEM 0 Rev 01 740-063046 QCS1707U1C6 PS 1.4-2.52kW; 90-264V AC in
PEM 1 Rev 01 740-063046 QCS1823U0CW PS 1.4-2.52kW; 90-264V AC in
PEM 2 Rev 01 740-063046 QCS1707U1K8 PS 1.4-2.52kW; 90-264V AC in
PEM 3 Rev 01 740-063046 QCS1707U1E2 PS 1.4-2.52kW; 90-264V AC in
Routing Engine 0 REV 13 750-072925 EBBT2906 RE-S-2X00x6
vtbd0 13412 MB Virtio Block Disk
vtbd1 57344 MB Virtio Block Disk
vtbd2 511 MB QEMU HARDDISK QM00002 Emulated IDE Disk
usb0 (addr 0.1) XHCI root HUB 0 Intel uhub0
Routing Engine 1 REV 13 750-072925 EBBT2957 RE-S-2X00x6
CB 0 REV 09 750-062572 CAKF6510 Enhanced MX SCB 2
CB 1 REV 09 750-062572 CAKX7845 Enhanced MX SCB 2
On Junos OS platforms (EX, MX, QFX, PTX), interface errors were observed on the igb0 interface following the upgrade to Junos OS version 21.2 and later. These errors are cosmetic only and do not impact service.
Issue is tracked on below PR:
https://prsearch.juniper.net/problemreport/PR1902917
For understanding igb0 interface, refer below KB:
https://supportportal.juniper.net/s/article/Host-0-igb0-Ethernet-Link-to-other-RE-Down