Description

This article explains how to troubleshoot increasing values in the "Framing errors" counter in the show interfaces extensive command output for Juniper Networks devices.

 

Symptoms

The value in the "Framing errors" counter in the show interfaces extensive output is seen to be increasing as shown below:

user@srx>show interfaces extensive

Physical interface: ge-0/0/0, Enabled, Physical link is Up
  Interface index: 134, SNMP ifIndex: 505, Generation: 137
  Link-level type: Ethernet, MTU: 1514, Link-mode: Full-duplex, Speed: 1000mbps,
  BPDU Error: None, MAC-REWRITE Error: None, Loopback: Disabled,
  Source filtering: Disabled, Flow control: Enabled, Auto-negotiation: Enabled,
  Remote fault: Online
  Device flags   : Present Running
  Interface flags: SNMP-Traps Internal: 0x0
  Link flags     : None
  CoS queues     : 8 supported, 8 maximum usable queues
  Hold-times     : Up 0 ms, Down 0 ms
  Current address: 00:26:88:eb:62:c0, Hardware address: 00:26:88:eb:62:c0
  Last flapped   : 2012-06-04 14:39:14 UTC (00:35:10 ago)
  Statistics last cleared: Never
  Traffic statistics:
    Input  bytes  :                30972                    0 bps
    Output bytes  :                    0                    0 bps
    Input  packets:                  427                    0 pps
    Output packets:                    0                    0 pps
  Input errors:
    Errors: 0, Drops: 0, Framing errors: 156, 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: 1, 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: 12 supported, 5 in use
 Queue counters:    Queued packets Transmitted packets   Dropped packets
  0            8188558616      8180261608       8297008
  3                0          0          0
  4                0          0          0
  7             14833185       14833185          0
  8              19892        19892          0

Output drops can also be seen due to the presence of framing errors on the affected interface.
Note: See KB24601 - [MX/SRX] Meaning of the input and output errors in the 'show interface extensive' command [juniper.net] for more information about the input and output errors.

Solution

Framing errors" are the number of packets received with an invalid frame checksum (FCS). This is typically due to a physical issue [such as cabling, a bad port, or a bad Network Interface Card (NIC)], but can also indicate a duplex mismatch.

 

To resolve the issue, check the following:

  1. Check the duplex setting on both sides of the devices. Make sure that both are using full duplex.
  2. Change to another good cable to exclude bad or damaged cable issues
  3. Change the SFP with any other working SFP and check the status.
  4. Change to another port to exclude NIC card issues.


If the framing error is resolved when SFP is changed, RMA needs to be processed for faulty SFP 
If framing errors is resolved when port is changed , RMA needs to be processed for faulty Chassis

If the issue occurs even after doing the above, check the peer device to see if its FCS error output counter is increasing and perform troubleshooting on the peer device.

Please open a Jtac case if you still observing framing error after executing the above steps.

Modification History

2020-02-27: Article reviewed for accuracy; no changes required.
2023-03-21: Added all Junos to categories. 
2023-07-24: Added technical points 

 

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