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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

Understanding Cisco config register

Posted on 2016-04-29 by greathairengineer

Let’s just get down to business, we all use it but few of us understand what any of it means. The documentation is a little, well, complicated for some people s...

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...

Networking

Object groups in Nexus

Posted on 2015-04-29 by greathairengineer

Much like on firewalls you can create object groups in Nexus, which you can utilize when you’re implementing ACLs object-group ip address {OBJECTNAME}{subnet/ma...

Networking

Cisco MST 802.1s

Posted on 2015-04-28 by greathairengineer

All Cisco switches by default have PVST+ as their spanning-tree protocol (mode). PVST+ is Cisco proprietary and, in my humble opinion, should never be used in a...

Networking

Etherchannel load balancing – Explained

Posted on 2014-09-29 by greathairengineer

It is a common mistake to assume X number of ports in an etherchannel equates to the common port speed * X; however, this is grossly incorrect and I’ll attempt ...

Networking

Find CDP traffic on your Linux box

Posted on 2012-04-28 by greathairengineer

You can use tcpdump or wireshark but if you have a Linux box handy you can install: cdpr. It makes life easy like this: cdpr -v Just follow the prompts for sele...

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