CEF is not only used in MPLS ,but rather its also used for MPLS.
Traditionally CEF has been used in IP routers to make forwarding decisions. What this means is routing tables
create RIB based on the routing information they have. This information is used by CEF to create a forwarding information
base (FIB) which has the outgoing interface information as well.
In addition to this it creates a Adjacency table, which is nothing but layer 2 addressing information to reach the next-hop IP on a outgoing interface. Using these two information the processor does express switching/forwarding.
(This enables the router not to do multiple lookups i:e: for destinationIP, then the outgoing interface and then the
Framing type on that outgoing interface)
Now, in MPLS since the router has to process Labels in addition to the Layer 2 encapsulation/decapsulation.
Its makes more sense and easier for the router to incorporate this Label rewrite information into the LFIB.
And make the forwarding decisions using the combination of LFIB and Adjacency table.
To summarize it, CEF is a forwarding mechanism based on the principle of seperation of control and forwarding plane to achieve fast switching. Different such mechnisms may be implemented by other vendors to do forwarding.
The Cisco EPN system incorporates a network architecture designed to consolidate multiples services on a single Multiprotocol Label Switching (MPLS) transport network. This network is designed primarily based on Application Engineered...
Internet security is important with the increasing attacks that are happening every day. Many internet and browsing security solutions exist, but some are not very easy to use or maybe the question is how can I enable them?
Cisco Software Manager Server
This document describes the programmatic interfaces, RESTful APIs, which are supported by Cisco Software Manager Server (CSM Server).
CSM Server supports a set of finite RESTful APIs. The fir...