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cisco

Cisco Trunk-splosion Protection

On IOS switches with EEM, protect yourself (and less careful Jr engineers) with this applet that will prevent allowed-vlan-mishaps on trunks!

  • Derek, CCNP-E/AIS
    Derek, CCNP-E/AIS
1 min read
cisco

Cisco NX-API via HTTPS

Secure NX-API calls using HTTPS with a self-signed certificate.

  • Derek, CCNP-E/AIS
    Derek, CCNP-E/AIS
2 min read
linux

FileCloud Sync Client on Linux

Getting the FileCloud Sync Linux client working and accessible can be a bit cumbersome; this is an installation script for the Linux FileCloud sync client.

  • Derek, CCNP-E/AIS
    Derek, CCNP-E/AIS
6 min read
jinja2

Jinja2 Switch Templating with FreeZTP

This is a sanitized example of a switch template that I built out with a strong focus on keeping the process as simple and unbreakable as possible for the intended end-users.

  • Derek, CCNP-E/AIS
    Derek, CCNP-E/AIS
41 min read
cisco

Cisco EEM: Auto Interface Descriptions

These applets will automatically update the description of an interface where a new CDP neighbor is detected, if not already described accordingly.

  • Derek, CCNP-E/AIS
    Derek, CCNP-E/AIS
5 min read
cisco

Cisco Smart Install - IOS-XE Stack Auto-Allocation

When this snippet is added to a Jinja2 template it will automatically build out an EEM applet that will set switch priorities and renumber all switches in the stack.

  • Derek, CCNP-E/AIS
    Derek, CCNP-E/AIS
12 min read
cisco

Cisco Smart Install - IOS-XE Upgrade Caveat

IOS-XE 3.7.4 cannot upgrade to 16.3.6 via smart-install because *new force* isn't appended. This workaround uses EEM applets in the FreeZTP J2 switch template to download install the updated image.

  • Derek, CCNP-E/AIS
    Derek, CCNP-E/AIS
9 min read
cisco

AnyConnect VPN with(out) DUO 2FA

A user's status can be set as 'Bypass' in the Duo Admin Panel (to bypass 2FA), but as an exercise we can also use Duo's Auth Proxy along side a separate authentication server in an environment with Duo 2FA users and non-2FA users.

  • Derek, CCNP-E/AIS
    Derek, CCNP-E/AIS
2 min read
pi-hole

Pi-hole: Local DNS, Public DOH

Using Pi-hole and Cloudflare’s new 1.1.1.1 and 1.0.0.1 public DNS servers together is a good idea… bolting DoH (DNS over HTTPS) onto that via the Cloudflared daemon is an even better idea (until Pi-hole natively supports DoH anyways).

  • Derek, CCNP-E/AIS
    Derek, CCNP-E/AIS
4 min read
securecrt

SecureCRT: Session Logging

Session logging can prove extremely useful when recollecting events during troubleshooting scenarios or even configuration-binges. SecureCRT’s logging settings allow the use of variables to define the filename/path.

  • Derek, CCNP-E/AIS
    Derek, CCNP-E/AIS
2 min read
cisco

NX-OS Default Interface from Enable Mode

Considering the 9000v is really only for labbing this isn’t a huge deal, but I was able but to default an interface from enable mode; config mode is not required.

  • Derek, CCNP-E/AIS
    Derek, CCNP-E/AIS
1 min read
cisco

NX-OS Dynamic Routing over vPC VLAN

Configure EIGRP on the N9K platform to establish dynamic routing adjacencies and achieve ECMP on a vPC VLAN.

  • Derek, CCNP-E/AIS
    Derek, CCNP-E/AIS
4 min read
opinion

Network Engineering, Musical Chairs

I hear this *rule* regarding changing jobs frequently as a Network Engineer, focused primarily on maximizing income potential; I'm thinking there has to be exceptions to this.

  • Derek, CCNP-E/AIS
    Derek, CCNP-E/AIS
2 min read
securecrt

SecureCRT: Flow Control Paste

To help prevent overwhelming network devices while pasting in large configuration files, user miked provided a script that you can use in SecureCRT on the Van Dyke forums.

  • Derek, CCNP-E/AIS
    Derek, CCNP-E/AIS
5 min read
cisco

Fix: Cisco MARS Upgrade from Recovery

Recently I received an RMA replacement for a CS-MARS-20 unit that had a failing drive. After restoring the backup from version 6.1.5 everything was back to normal, but we needed to get onto the latest version (6.1.8).

  • Derek, CCNP-E/AIS
    Derek, CCNP-E/AIS
2 min read
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