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Networking

Cisco 2K FEX 40/100 BiDi

Posted on 2021-05-06 by greathairengineer

The question comes up often about using the Cisco 40/100G BiDi QSFP28 optic for use with the Cisco Nexus 2348UPQ, or even other current Nexus 2300 FEX modules, ...

Networking

Find number of ports by type

Posted on 2020-04-03 by greathairengineer

One common issue, and question, I get in the field is determining how many of a particular port type and speed is deployed in your data center network? This pos...

Networking

Parse CDP neighbor with regex

Posted on 2020-03-26 by greathairengineer

There are many ways to filter output, but this will, at least, add the top line of the show cdp neighbor detail command to isolate everything for you

General Tech Tips

No matching key exchange method found – Linux and Mac OSX

Posted on 2018-05-09 by greathairengineer

Lots of people get this error because most OS developers are deprecating the use of insecure key exchanges; however, there are many equipment and other OS vendo...

Networking

Nexus 93180YC-EX with Cisco Nexus 2348UPQ 40GbE

Posted on 2018-01-24 by greathairengineer

I  have seen this around the Internet and a lot of the information is old, and incorrect at the date of this blog post. Thus, what I will link here is the ...

IPv6/Networking

How to IPv6 – a common sense approach

Posted on 2017-06-14 by greathairengineer

Never thought I would be writing about how to utilize IPv6 in 2017 because of all the excellent material on the Internet; however, I have discovered a few thing...

Networking

What is Cisco Nexus ToR-FEX

Posted on 2017-02-07 by greathairengineer

I realize there is still some confusion regarding Cisco Nexus FEX as it relates to ToR connected FEX, which is a Cisco Nexus 2K FEX with a Cisco Nexus 5K/7K/9K ...

Networking

Cisco Nexus 9300 QOS

Posted on 2016-06-29 by greathairengineer

Based on 6.x code, and I believe 7.x but I could be wrong: f you’re coming from the Nexus 5500 platforms you’re in for a little tweaking to get this working as ...

EVPN VXLAN

Cisco BGP EVPN VXLAN – Part 2 – Spine uplink failure

Posted on 2015-12-29 by greathairengineer

So, you’ve surely seen some interesting tidbits in the previous section, things you haven’t noticed from other configurations on the Internet. I will outline wh...

EVPN VXLAN

Cisco BGP EVPN VXLAN- Part 1

Posted on 2015-12-28 by greathairengineer

Here is an overview of the Cisco implementation for VXLAN using BGP EVPN for distributed control-plane operations. anycast gateway, and unicast head-end replica...

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