What happened to “write memory” IOS command in Cisco Nexus 7000 Series Switch?

Yasir Irfan — Wed, 05 Jan 2011 06:05:45 +0000

When configuring Cisco Catalyst Switches, I quite often use “write memory” command to save my configuration rather than using “copy running-configuration startup-configuration” Cisco IOS command. Other day I was saving my running configuration to the startup configuration in a Cisco Nexus 7000 Series Switch in the usual way ” wri mem”. But I got the following error

VDC-Admin-DC-AGG1# write memory
^
% Invalid command at ‘^’ marker.
VDC-Admin-DC-AGG1#

Now Cisco Nexus 7000 Series switch won’t support the “write memory” command. Rather you need to use the “copy running-configuration startup-configuration” to save your configuration. One more difference I figured out between Cisco IOS and NX-OS is the missing of “write memory” command.

VDC-Admin-DC-AGG1#
VDC-Admin-DC-AGG1# write ?
erase Destroys the configuration on persistent media

VDC-Admin-DC-AGG1# write

Now the time has come for me better start using “copy running-configuration startup-configuration” command in NX-OS based Cisco switches.

“Show mac address-table count” a useful Cisco IOS command

Yasir Irfan — Sat, 25 Sep 2010 05:07:40 +0000

Suppose you want figure out total number of active MAC Address for each VLAN in Cisco Catalyst Switch, you can figure it out by using a command “Show mac address-table count”.

This command can give a good idea of the size of the CAM table and how many hosts are using the network.

From the above example you can notice how many mac address are used by each vlan and how many free mac address are available

A useful command for troubleshooting purpose as well as it’s a part for CCNP Switch 642-813 curriculum.

Network technologies and trends » Cisco IOS command

What happened to “write memory” IOS command in Cisco Nexus 7000 Series Switch?

“Show mac address-table count” a useful Cisco IOS command