Hi This a general query I want to know about CEF. As I understood CEF is kind of switching technology used in router for faster processing as it is ASIC hardware ... it's works on wire speed. Also...it have two tables..... FIBand adjancency table which farwards packet. Now my query is is it always a hardware dependent feature. If I have a router of old version is CEF is possible to enable. I also heard that there are two types of CEF... centrallized and distributed. .... so CCEF----- is IOS dependent and DCEF is hardware dependent. .....am I right ????? Ragards Gan
CEF :- When Cisco Express Forwarding is enabled on a router, the Route Processor (RP) performs the express forwarding.(
isco Express Forwarding (CEF) is advanced, Layer 3 IP switching technology. CEF optimizes network performance and scalability for networks with large and dynamic traffic patterns, such as the Internet, on networks characterized by intensive Web-based applications, or interactive sessions.
CEF was introduced on many platforms in Cisco IOS 12.0 mainline, particularly low- and mid-range platforms such as the Cisco 1600, 2500, and 3600 Series
(You can also check by using the command : show ip cef-- this would give you the info).
Dcef:-DCEF is distributed Cisco Express Forwarding. Normal CEF is where the supervisor engine holds the forwarding table and the adjacency/neighbour table and makes forwarding decisions for every line card. The main difference with dCEF is that each line card holds a copy of the neighbour table and forwarding table and can make forwarding decisions for itself. This takes burden of the Supervisor engine and speeds up packet forwarding
This is actually a pretty cool feature, i didn't even know it existed until I was looking for a solution to advertise a subnet (prefix in BGP talk), only if a certain condition existed. This is exactly what conditional advertisements does
j ai une question j ai achete un routeur cisco 887VA-k9 , je le configuré avec la configuration ci- dessous
si je le lier avec mon pc portable sur l un de ses ports directement ça marche toute est bien ( la connexion internet + m...
Attached policy provides CLI access to the Cisco 4G router over text messaging. Two files are in the attached .tar file:
2. PDF with instructions on how to load and use the .tcl file.