The Interface Statistics is not incrementing and is stuck with the values 0 for interfaces associated with the MPC10E card
You can see the following scenario wherein the interfaces are stuck at value 0 and not incrementing, in spite of active traffic passing from the router.
Physical interface: et-4/0/2, Enabled, Physical link is Up
Interface index: 281, SNMP ifIndex: 784, Generation: 284
Description: MX480et-4/0/2
Link-level type: Ethernet, MTU: 9192, MRU: 9200, Speed: 100Gbps, BPDU Error: None, Loop Detect PDU Error: None, Ethernet-Switching Error: None, Loopback: Disabled, Source filtering: Disabled, Flow control: Disabled
Pad to minimum frame size: Disabled
Device flags : Present Running
Interface Specific flags: Internal: 0x100200
Interface flags: SNMP-Traps Internal: 0x4000
Link flags : None
CoS queues : 8 supported, 8 maximum usable queues
Schedulers : 0
Hold-times : Up 0 ms, Down 0 ms
Damping : half-life: 0 sec, max-suppress: 0 sec, reuse: 0, suppress: 0, state: unsuppressed
Current address: ff:ff:ff:ff:ff:84, Hardware address: ff:ff:ff:ff:ff:3f
Last flapped : 2025-09-26 01:33:41 CEST (2w0d 07:44 ago)
Statistics last cleared: 2025-10-09 08:28:39 CEST (1d 00:49 ago)
Traffic statistics:
Input bytes : 0 0 bps
Output bytes : 0 0 bps
Input packets: 0 0 pps
Output packets: 0 0 pps
IPv6 transit statistics:
Dropped traffic statistics due to STP State:
Input bytes : 0
Output bytes : 0
Input packets: 0
Output packets: 0
Input errors:
Errors: 0, Drops: 0, Framing errors: 0, Runts: 0, Policed discards: 0, L3 incompletes: 0, L2 channel errors: 0, L2 mismatch timeouts: 0, FIFO errors: 0, Resource errors: 0
Output errors:
Carrier transitions: 0, Errors: 0, Drops: 0, Collisions: 0, Aged packets: 0, FIFO errors: 0, HS link CRC errors: 0, MTU errors: 0, Resource errors: 0
Egress queues: 8 supported, 4 in use
Queue counters: Queued packets Transmitted packets Dropped packets
0 0 0 0
1 0 0 0
2 0 0 0
3 0 0 0
Queue number: Mapped forwarding classes
0 best-effort
1 expedited-forwarding
2 assured-forwarding
3 network-control
There is no other issue with the interface and the traffic is flowing as expected, Its just that these counters are not incrementing.
To resolve the issue, manually modify the register within the PFE. The following PFE-level commands must be executed under the MW session.
start shell user root
vty fpcX.0
bringup jspec write ztchip[X] register hostsys hostif hifregs msi_interval 0x2 (can be done after #reboot to prevent hitting the problem)
bringup jspec write ztchip[X] register hostsys hostif hif_global_regs local_mem sram 5120 1 (required after hitting the problem to recover)
If the above command does not resolve the issue, the customer should refer to the PR outlined below to perform the appropriate recovery process.
https://prsearch.juniper.net/#!/search?page=prcontent&id=PR1882845