Cisco 2K FEX 40/100 BiDi
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, ...
Tag: Cisco
Find number of ports by type
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...
Understanding Cisco config register
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...
Cisco BGP EVPN VXLAN- Part 1
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...
Object groups in Nexus
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...
Cisco MST 802.1s
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...
Etherchannel load balancing – Explained
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 ...
Find CDP traffic on your Linux box
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...