Description

This article describes the issue of the increase in the Output packet error count for the fabric link, when a SRX 1000/3000/5000 cluster operates in the Z mode.

Symptoms

When a SRX 1000/3000/5000 cluster operates in the Z mode, the output packet error count increases for the fabric link.

Solution

 

The output of show interfaces extensive for the fabric link shows that the Output packet error count increases over time. This can be observed on SRX 1000/3000/5000 clusters that operate in the Z mode. In Z-mode, the traffic traverses through the fabric link and this error count also increases with the traffic flowing through. 

Here is a sample output of when the device is in this condition: 

Filter statistics:
    Input packet count              5802585972
    Input packet rejects                  1544
    Input DA rejects                         0
    Input SA rejects                         0
    Output packet count             4553569332
    Output packet pad count                  0
    Output packet error count           965116 <
    CAM destination filters: 0, CAM source filters: 0
This increase is superficial in nature, unless there a drop in traffic; make sure that there are no packet drops. One way to check if packets are being dropped is to use the show interfaces extensive command. If packets are being dropped, contact JTAC.