our Server is directly connected to switch port 0/30 ,after couople of hours the port went down .
Status of port is notconnected . I cheked the logs on switch . Port flapped for 2 to 3 times and went down.
There were input and output errors on port. We cleared counters and changed cable but same issue persist.
We want to known:
Because of input and output errors port will go down
how to check wheather the problem is from server's NIC interface, because we change switch port and tried.
Why port is flapping and going down
Your help is highly appreciated
Flaping of ports by server can be a reason that server NIC is connected to two switch ports at switch and proper teaming is not been done at server end and also check the duplex and speed setting at switch end with server connected to it.
and if possible can you paste your show interface output in which server port is connected.
Switch#show interfaces gi0/31 GigabitEthernet0/31 is up, line protocol is up (connected) Hardware is Gigabit Ethernet, address is 000a.b8xx.xxxx (bia 000a.b8xx.xxxx) Description: "connected to server" MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec, reliability 255/255, txload 1/255, rxload 1/255 Encapsulation ARPA, loopback not set Keepalive set (10 sec) Full-duplex, 1000Mb/s, media type is 10/100/1000BaseTX input flow-control is off, output flow-control is unsupported ARP type: ARPA, ARP Timeout 04:00:00 Last input never, output 00:00:01, output hang never Last clearing of "show interface" counters never Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0 Queueing strategy: fifo Output queue: 0/40 (size/max) 5 minute input rate 2000 bits/sec, 1 packets/sec 5 minute output rate 1000 bits/sec, 2 packets/sec 633786019 packets input, 894843224 bytes, 0 no buffer Received 38866 broadcasts (0 multicast) 0 runts, 0 giants, 0 throttles 0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored 0 watchdog, 7 multicast, 0 pause input 0 input packets with dribble condition detected 454528365 packets output, 3750704538 bytes, 0 underruns 0 output errors, 0 collisions, 1 interface resets 0 babbles, 0 late collision, 0 deferred 0 lost carrier, 0 no carrier, 0 PAUSE output 0 output buffer failures, 0 output buffers swapped out
Above output is not having any error in the shown log, I would suggests you to check the Teaming or Bonding configuration at server end.
Tell me onething Is your server both the nic is connected to same switch or different switch,If same switch then i would suggests to make etherchannel between the switch port end and server end and if different then configure at server end as Active/passive fashion and then check.
I'm going to agree with Ganesh. Check the configuration of your server. Disconnect/disable 1 of 2 and verify if the ports are still flapping. If you want to test the cable, the 3560 support "test cable-diagnostic tdr interface" command. You can see the result by using the command "sh cable-diagnostic tdr interface".
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
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