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Cisco Bug: CSCvv07846 - Port error disables due to debounce timer shows - Link reset failed due to re-negotiation failure

Last Modified

Oct 19, 2020

Products (1)

  • Cisco MDS 9000 NX-OS and SAN-OS Software

Known Affected Releases

8.4(1a)

Description (partial)

Symptom:
Several problems:

1 - When port fails due to debounce timer it states - "Link reset failed due to re-negotiation failure"

<pre>
2020 Jul 20 15:09:39 MDS9710 %PORT-5-IF_DOWN_LINK_FAILURE: %$VSAN 237%$ Interface fc9/17 is down (Link failure Link reset failed due to re-negotiation failure)
</pre>

<pre>
MDS9710# slot 9 show port-config internal link-events

*************** Port Config Link Events Log ***************
----                            ------        -----  -----  ------
Time                            PortNo        Speed  Event  Reason
----                            ------        -----  -----  ------
Jul 20 15:09:39 2020  00192138  fc9/17         ---   DOWN   Disable
Jul 20 15:09:39 2020  00188546  fc9/17         ---   DOWN   Debounce Tmo
Jul 20 15:09:38 2020  00223591  fc9/17         4G     UP    Not FL
Jul 20 15:09:38 2020  00169087  fc9/17         ---   DOWN   NOS Rcvd
Jul 20 15:08:30 2020  00639204  fc9/17         4G     UP    Not FL
Jul 20 15:08:30 2020  00585163  fc9/17         ---   DOWN   NOS Rcvd
Jul 20 15:08:30 2020  00439201  fc9/17         4G     UP    Not FL
Jul 20 15:08:30 2020  00385048  fc9/17         ---   DOWN   NOS Rcvd
Jul 20 15:08:30 2020  00249225  fc9/17         4G     UP    Not FL
Jul 20 15:08:30 2020  00185198  fc9/17         ---   DOWN   NOS Rcvd
Jul 20 15:08:30 2020  00038276  fc9/17         4G     UP    Not FL
Jul 20 15:08:29 2020  00985179  fc9/17         ---   DOWN   NOS Rcvd
Jul 20 15:08:29 2020  00838279  fc9/17         4G     UP    Not FL
...
</pre>

2 - Show interface does not display reason for error disable:

<pre>
MDS9710# show int fc9/17
fc9/17 is down (Error disabled)
    Hardware is Fibre Channel, SFP is short wave laser w/o OFC (SN)
    Port WWN is 22:11:54:7f:ee:ea:6f:00
    Admin port mode is auto, trunk mode is off
    snmp link state traps are enabled

...
</pre>

3 - IF_DOWN_LINK_FAILURE message is displayed twice:

<pre>
2020 Jul 20 15:09:39 MDS9710 %PORT-5-IF_DOWN_LINK_FAILURE: %$VSAN 237%$ Interface fc9/17 is down (Link failure Link reset failed due to re-negotiation failure)
2020 Jul 20 15:09:39 MDS9710 %PORT-2-IF_DOWN_LINK_FAILURE_CRIT: %$VSAN 237%$ Interface fc9/17 is down (Link failure Link reset failed due to re-negotiation failure)
2020 Jul 20 15:09:39 MDS9710 %PORT-2-IF_DOWN_ERROR_DISABLED: %$VSAN 237%$ Interface fc9/17 is down (Error disabled)
</pre>

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