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!

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!