Understanding Nexus -- Part 7 -- Basic Configs

Ok then. Since now you know all the required things like hardware, software, software user interface, keyboard shortcuts and all… now its time to look at actual configuration.

In this post we will discuss about the very primary things, which you have to configure on any device at the time of deployment. Like Hostname, MOTD, Banner, telnet etc. etc.

1. Hostname

To change the device hostname... The “name” is alphanumeric, case sensitive, and has a length of 32 characters. The default is switch.

switch# configure terminal

switch(config)# hostname Engineering2

Engineering2(config)#

2. MOTD Banner

Maximum of 80 characters per line and Maximum of 40 lines

switch# configure terminal

switch(config)# banner motd #Welcome to the Switch#

switch# show banner motd

3. Saving the Config

Well its pretty same as what we do in IOS.

switch(config)# copy running-config startup-config

4. Erasing the Startup Configuration

The “write erase” command erases the startup configuration except the boot variables, mgmt0 interface IP address and subnet mask, static routes in the management vrf context. 

If you want to erase the complete configuration use the “boot” option with the command

switch# write erase

5. Telnet / SSH

SSHv2 is enabled by default and is the recommended protocol for CLI remote access.

TELNET is disabled by default since it is less secure.

Both TELNET and SSHv2 clients are supported as well.

Configuring Telnet

switch# configure terminal

switch(config)# feature telnet       --- Enables Telnet

switch(config)# line vty

switch(config-line)# exec-timeout 30

switch(config-line)# exit

switch(config)# copy running-config startup-config

Configuring SSH

switch# configure terminal

switch(config)# no feature ssh       --- Disable SSH & generate RSA key

switch(config)# ssh key rsa 

generating rsa key(1024 bits)......

generated rsa key

switch(config)# feature ssh        --- Re-enables SSH