MPLS – LSP Path Selection, LIB, LFIB, RIB, FIB, and CEF forwarding reviewed, how to view the tables, and how they all work to get traffic to its destination network!

The above Topology is how traffic say from Customer site Looped 1 would Label Switch traffic over to Looped2 on the right hand side of the Topology, and I will review exactly how the LSR's know where to send a packet when it arrives with a local label but multiple neighbors advertising label bindings for … Continue reading MPLS – LSP Path Selection, LIB, LFIB, RIB, FIB, and CEF forwarding reviewed, how to view the tables, and how they all work to get traffic to its destination network!

CEF – Deep dive into FIB and AT Tables, how packet MAC Addresses are re-written, and diagrams to explain along the way! IMPORTANT for Exam Day!!!

I figured I would take it easy on a Friday night, and do a full blow lab on CEF 🙂 This Topology is a good example to review CEF FIB and Adjacency tables, as you don't need a really large Topology to demonstrate, provides "Packet Switching" information meaning it just wants to read the packet … Continue reading CEF – Deep dive into FIB and AT Tables, how packet MAC Addresses are re-written, and diagrams to explain along the way! IMPORTANT for Exam Day!!!

MultiLayer Switching / CEF – Packet processing explained in depth, and visually presented for clarity!

The above illustration is exactly how a MultiLayer Switch interconnects logically The MultiLayer Switching segment confused of my studies confused me to no end, and when studying some material today it clicked what is meant by "Hardware Switching" vs Process or Fast Switching, and wanted to review it here as well in a more visual … Continue reading MultiLayer Switching / CEF – Packet processing explained in depth, and visually presented for clarity!

MLS Packet Switching – A brief history, CEF, Adjacency Table, Terminology, Hardware explanations and SDM Template considerations!

This is meant to be more geared "CEF" Packet Switching technology, but you can't really appreciate the evolution of Packet Switching, without first knowing its history along with the Cisco hardware modules on their current devices that make CEF possible. The being said, a quick review of Packet Switching methods leading up to CEF! Process-Switching … Continue reading MLS Packet Switching – A brief history, CEF, Adjacency Table, Terminology, Hardware explanations and SDM Template considerations!

Quick notes on IP CEF and the Adjancency Table for exam day!

No Topology needed for this one, just wanted to jot some quick notes from a video I'm reviewing on the subject. Before getting into what CEF and AT is all about, I feel its important this is required to be on and working for uRPF (Unicast Reverse Path Forwarding). CEF is derived from the IP … Continue reading Quick notes on IP CEF and the Adjancency Table for exam day!

CEF (Cisco Express Forwarding), L3 “Switching”, RIB / FIB explained, and a ton of good info important for exam day!

Once again, this is a no non-sense post, with no Topology associated to it (though there will be some router output to demonstrate things). I'll do this one bullet point style, think it makes the points jump out a bit more: CEF is described as Layer 3 Switching, but this means packet switching, not frame … Continue reading CEF (Cisco Express Forwarding), L3 “Switching”, RIB / FIB explained, and a ton of good info important for exam day!