Nexus 5596 FC-Port Link-Events

[Iker Santamaria Molla]

Hi all,

int the last 3 weeks,

almost every day , we have a series of events in the connection between one Nexus 5596 and one of our servers. The connection is in FC (4G).

I need help to understand the output of the following command to troubleshoot what could be happening.

Sw-cpd-mm-n5k-2# show hardware internal fc-mac 3 port 14 link-event

MMDDYY           HHMMSS usecs                                 Event                                      Current State

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

-                          -                                                                                                      LINK_ACTIVE      

100113              020845 773895 (0001)                              E_LINK_IDLE                               LINK_LRR_RX

100113              020845 765016 (0000)                           E_LINK_LRR                           LINK_LR_TX

100113              020845 763545 (61CB28)                       E_LINK_LINK_RESET             LINK_ACTIVE 

Sw-cpd-mm-n5k-2# show hardware internal fc-mac 3 port 14 port-event

MMDDYY               HHMMSS usecs                              Event                                                     Current State

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

-                              -                                                                                                        IPS_LINK_UP     

100113                 020845 775908 (0000)                        E_IPS_LINK_INIT_SUC                   IPS_LINK_UP     

100113                 020845 775907 (0000)                        E_IPS_IDLE                                   IPS_LINK_UP     

100113                 020845 770040 (0001)                        E_IPS_LRR                                    IPS_LINK_UP     

100113                 020845 763562 (61CB28)                    E_IPS_CREDIT_LOSS                    IPS_LINK_UP  

Looking at the output I don't know who generates "E_LINK_LINK_RESET" , Nexus switch or server?

Thanks in advance!

[guijarro_felipe · Accepted solution]

Hi,

I know it is a little bit late, but hope it can still be of use...

According to the log output, The switch detects a Credit Loss condition

00113                 020845 763562 (61CB28)                    E_IPS_CREDIT_LOSS                    IPS_LINK_UP

and to recover from it, the switch resets the link by sending a LR to the server

100113              020845 763545 (61CB28)                       E_LINK_LINK_RESET             LINK_ACTIVE

the server replies with a LRR, IDLE, etc.

100113              020845 765016 (0000)                           E_LINK_LRR                           LINK_LR_TX

Kind rgds,

Felipon

[Iker Santamaria Molla]

Thanks a lot!

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