Spelunking the caves :: Cisco ASA REST API
For one of my projects we need to extract realtime data from Cisco ASA firewalls. Cisco already provides a REST agent for ASA Firewalls since 2014-ish. The REST agent provided…
Getting distracted by MPLS L3 VPN’s
It started of with my SD-WAN lab. After hours of studying and eventually adding a few vEdges to finalize the Control Plane bringup, I was ready for templating, creating different…
Network Fundamentals :: Etherchannels
EtherChannels AKA LAG, Port-channels, NIC teaming, etc Main goal is to improve bandwidth and forwarding capabilities.LAG hides each member from an upper layer protocol, in this case STP. Where STP…
Network Fundamentals :: TTL
TTL (or Time To Live) is a Layer-3 loop prevention mechanism. Every time a packet passes a Layer-3 hop, the TTL decrements with 1. Packets with a TTL of 0…
Network Fundamentals :: The 802.1Q Packet
IEEE 802.1Q An additional of 32 bits are added to packet header consisting of: Tag protocol identifier (TPID): 16 bitsBelow are part of the TCI structure and is divided in…
SD-WAN :: Deploying the controllers
I've noticed that deploying SD-WAN controllers come with a special threatment. When working your way through it and deploying more config than needed could result in controllers not being added…
Nothing beats an “analog” book!
It finally arrived! After studying for a while with an ePub version of this book, it started to annoy me. The LED light propagated on my face all the time…
Catalyst 6880-X :: oversubscription versus performance mode
The catalyst 6880-X has been here for a while now and has already been announced for End-of-Life in October 2019. Last day of support will be Oct 2025. Before that…
WLAN Peer-to-Peer Blocking :: Demystified
:: Historical Since AirOS 4.2 there is an option available in Cisco's WLAN controllers called Peer to Peer blocking. Previously a more lightweight version was presented to push all ARP…
SD-WAN Deployment Options :: Partner delivered versus On-Prem
:: Partner delivered Cisco Partners can host en sell their own SD-WAN infrastructure to customers as part of value added service. By utilizing their own compute environment they can host…