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Why are green LEDs blinking on ports that are not UTP connected?


UTP is not connected but the green LED is blinking on the port.
Disabling a port will also mark the link status as active.
I have treated the equipment three times with the same symptoms, but I get the same symptoms.
I wonder how these symptoms come out and how to solve them.

In the picture below, ports 21 and 24 are not connected to the utp but a green LED
Coming in. If you disable port 21, the link is enabled as shown below.



Image : ExtremeXOS version 15.6.3.1 v1563b1-patch1-5 by release-manager
on Sun Aug 16 21:34:14 EDT 2015
BootROM : 2.0.2.3
Diagnostics : 6.3

Service First Recorded
Field Replaceable Units Days Start Date
---------------------------------------------------------------
Switch : X460-48p 22 Apr-27-2017

------------------------------------------------------------------------------------------------------------------

in # sh por configuration no-refresh
Port Configuration
Port Virtual Port Link Auto Speed Duplex Flow Load Media
router State State Neg Cfg Actual Cfg Actual Cntrl Master Pri Red
================================================================================
1 VR-Default E R ON AUTO AUTO UTP
2 VR-Default E R ON AUTO AUTO UTP
3 VR-Default E R ON AUTO AUTO UTP
4 VR-Default E R ON AUTO AUTO UTP
5 VR-Default E R ON AUTO AUTO UTP
6 VR-Default E A ON AUTO 10 AUTO FULL NONE UTP
7 VR-Default E A ON AUTO 1000 AUTO FULL SY/ASY UTP
8 VR-Default E R ON AUTO AUTO UTP
9 VR-Default E R ON AUTO AUTO UTP
10 VR-Default E A ON AUTO 1000 AUTO FULL SY/ASY UTP
11 VR-Default E R ON AUTO AUTO UTP
12 VR-Default E R ON AUTO AUTO UTP
13 VR-Default E R ON AUTO AUTO UTP
14 VR-Default E R ON AUTO AUTO UTP
15 VR-Default E A ON AUTO 1000 AUTO FULL SY/ASY UTP
16 VR-Default E R ON AUTO AUTO UTP
17 VR-Default E A ON AUTO 10 AUTO FULL NONE UTP
18 VR-Default E R ON AUTO AUTO UTP
19 VR-Default E R ON AUTO AUTO UTP
20 VR-Default E R ON AUTO AUTO UTP
21 VR-Default D A ON AUTO 1000 AUTO FULL SY/ASY UTP
22 VR-Default E R ON AUTO AUTO UTP
23 VR-Default E R ON AUTO AUTO UTP
24 VR-Default E A ON AUTO 1000 AUTO FULL SY/ASY UTP
25 VR-Default E R ON AUTO AUTO UTP
26 VR-Default E A ON AUTO 1000 AUTO FULL NONE UTP
27 VR-Default E A ON AUTO 1000 AUTO FULL SYM UTP
28 VR-Default E R ON AUTO AUTO UTP
29 VR-Default E A ON AUTO 1000 AUTO FULL SY/ASY UTP
30 VR-Default E R ON AUTO AUTO UTP
31 VR-Default E A ON AUTO 1000 AUTO FULL SY/ASY UTP
32 VR-Default E A ON AUTO 1000 AUTO FULL SY/ASY UTP
33 VR-Default E R ON AUTO AUTO UTP
34 VR-Default E R ON AUTO AUTO UTP
35 VR-Default E R ON AUTO AUTO UTP
36 VR-Default E R ON AUTO AUTO UTP
37 VR-Default E R ON AUTO AUTO UTP
38 VR-Default E R ON AUTO AUTO UTP
39 VR-Default E R ON AUTO AUTO UTP
40 VR-Default E R ON AUTO AUTO UTP
41 VR-Default E R ON AUTO AUTO UTP
42 VR-Default E R ON AUTO AUTO UTP
43 VR-Default E R ON AUTO AUTO UTP
44 VR-Default E R ON AUTO AUTO UTP
45 VR-Default E R ON AUTO AUTO UTP
46 VR-Default E R ON AUTO AUTO UTP
47 VR-Default E R ON AUTO AUTO UTP
48 VR-Default E A ON AUTO 100 AUTO FULL SY/ASY UTP
49 VR-Default E R ON AUTO AUTO NONE
50 VR-Default E R ON AUTO AUTO NONE
51 VR-Default E A ON AUTO 1000 AUTO FULL SYM 51 SX
52 VR-Default E A ON AUTO 1000 AUTO FULL SYM 51 SX
53 VR-Default E NP OFF 10000 FULL NONE
54 VR-Default E NP OFF 10000 FULL NONE
55 VR-Default E NP OFF 10000 FULL NONE
56 VR-Default E NP OFF 10000 FULL NONE
57 VR-Default E NP OFF 10000 FULL NONE
58 VR-Default E NP OFF 10000 FULL NONE
================================================================================

1 reply

Userlevel 5
Jeon, there were a few issues in the past in which X460 ports would go into a shutdown state, though the port would display Active and the LED would be green.

Looking into this there were two possible causes along with next actions:

1. Hardware - Please run extended diagnostics on the switch and verify whether any of the tests come back as failed. Also confirm whether the symptoms return after the reboot.

2. Software - As mentioned above, there was a rare issue with the PHY in which the state would not change. This was resolved in EXOS 16.1. It would be recommended to upgrade to v16.2.2.4-patch1-3 and monitor the ports to see whether the issue returns.

Let us know if there are any questions.

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