RSSAll Entries in the "Nexus" Category

Troubleshoot SFP validation failed on Cisco Nexus 5000

You can follow below steps when you find “SFP validation failed” error for any interface on Cisco Nexus 5000 series switches. Nexus# show interface Eth1/10 Ethernet1/10 is down (SFP validation failed) Hardware: 1000/10000 Ethernet, address: 0014.73b8.ac14 (bia : 0014.73b8.ac14) Description: vmserver1 When interface and transceiver speed is mismatched, the SFP validation failed message is displayed when you enter the show interface ethernet slot/port command. For example, if you insert a 1-Gigabit SFP transceiver into a port without configuring the speed 1000 command on interface, you will get this error. By default, all ports on a Cisco Nexus 5000 Series switch are 10 Gigabits. Troubleshooting steps: You have to change the interface speed from 10G to 1G. For Nexus 5010 only first 8 ports can be downgraded to 1G. Step 1. Set the interface speed to 1000 -> if You are unable to downgrade the speed, Step 2. Unplug the cable […]

How to upgrade\downgrade NX-OS on Cisco Nexus 5000 Switches

The procedure to upgrade/downgrade the NX-OS code on a Nexus 5000 series switches is very easy and it is almost same as for normal IOS. First go to the downloads section on and get the new version of the System software and Kickstart image. A CCO login is required for download NX-OS images. Next access the device, check the available free space in bootflash using dir bootflash: command and delete old NX-OS images if there is no sufficient space in bootflash. Nexus5500# dir bootflash: 744 Apr 20 02:08:48 2011 license_SSI15100AW7_10.lic 49152 Apr 20 02:11:45 2011 lost+found/ 1586 Nov 10 11:47:20 2011 mts.log 25136128 Apr 20 02:01:51 2011 n5000-uk9-kickstart.5.0.3.N1.1b.bin 188700150 Apr 20 02:02:52 2011 n5000-uk9.5.0.3.N1.1b.bin 4096 Jan 01 02:05:55 2009 vdc_2/ 4096 Jan 01 02:05:55 2009 vdc_3/ 4096 Jan 01 02:05:55 2009 vdc_4/ Usage for bootflash:// 331591680 bytes used 1319313408 bytes free 1650905088 bytes total Next upload the new code […]