In order to find unusual things on EX switch, I executed the junos cli of "clear interfaces statistics all" last Friday. Since then errors are shown below:
1-) From the following outputs, there are 2 collisions(Collisions: 1743 and Collisions: 48 ) are persistintly increasing. The following KB says that Collision always must be zero. Otherwise, there is a software bug. https://kb.juniper.net/InfoCenter/index?page=content&id=KB24601. What troubleshooting should I do? More further why there is no other errors on these 2 interface as they have collisions errors? It is realy weird.
2-) There is also number of "Carrier transitions:" from output below. One of them is very high and constantly increasing. what troubleshooting must be done for identifying issue.
3-) Is there additional pipe that can be add into cli of "show interfaces extensive | match "Carrier transitions: [^0]| Errors: [^0]| Drops: [^0]|Collisions: [^0]|CRC errors: [^0]| MTU errors: [^0]"" to get associated Physical interfaces?
@ARIX you wrote "The following KB says that Collision always must be zero." Always is a poor term usage there. It should say that 'probably should be zero'. The reason is that most newer Ethernet Devices support Full-Duplex (FDX) operation which eliminates completely any collisions. 'Collision' is an "old time" Ethernet stat, which is still always supported because people still use old devices. If you are seeing 'collisions' on an interface, it very likely indicates the external attached device is running 10M HDX (half-duplex), or some speed at HDX.
In my view, looks like external device is HDX which switch (with auto-neg?) thinks it should be FDX. This combination is NOT good and although (some) traffic may pass, throughput and performance should be greatly affected.
Not sure which exact EX switch model you are using, and what SW version you are on, but if you supply these I might be able to provide further insight, as EX HDX operation may change depending upon the EX model being used.
If the interface is flapping regularly then the carrier transitions count may increase. I see that the other two interfaces have been up for 5w however the interface ge-7/0/37 last flapped 00:01:54 ago and hence the high count of Carrier transition.