Over the past 3 months I’ve been working with Nexus NX-OS 9.3.(x) and learned an interesting command.

The command is show cli history. 1

Here is an example of work that was needed on two N9k switches.

inte eth 1/1, eth1/4, eth1/7 
(do work) 
 
 show cli history unformatted 
    conf t 
        inte eth 1/1 
        exit 
        inte eth 1/1, eth1/4, eth1/7 
            switchport mode trunk  
            no switchport acc vlan 

It is mildly interesting, yet helpful. Copy and paste the repeated commands.

conf t 
    inte eth 1/1 
    exit 
    inte eth 1/1, eth1/4, eth1/7 
        switchport mode trunk  
        no switchport acc vlan 

PowerOn Auto Provisioning (POAP)

NX-OS provides out of the box tooling that is very appealing. I have not yet tested POAP.

However, POAP reminded me of past work I’d performed using Preboot execution environment (PXE)2 with bare metal x86 servers, and using ONIE (Open Network Install Environment)3 for ONIE compatible hardware switches.

What is annoying

If you are used to traditional IOS or IOS-XE then it is likely you have made use of the command write to save the running-config. In fact, for me it is a habit to type write when I want to save a Cisco config. With NX-OS there is no command named write. Out of the box you only have the command copy running-config startup-config. Wut?

The way around this is to create an alias.

Sources
  1. Documentation for this command is found here, https://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus9000/sw/93x/fundamentals/configuration/guide/b-cisco-nexus-9000-nx-os-fundamentals-configuration-guide-93x/b-cisco-nexus-9000-nx-os-fundamentals-configuration-guide-93x_chapter_0110.html#task_A7160D8D14AD49CAA22E93716E3A6731[]
  2. This reference describes the specification https://datatracker.ietf.org/doc/html/draft-henry-remote-boot-protocol-00[]
  3. https://opencomputeproject.github.io/onie/[]
Last modified: 11/01/2022

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