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On router platforms with software-only forwarding (e.g., Cisco 7200), most traffic handling, including access control list filtering and forwarding, is done at interrupt level using Cisco Express Forwarding (CEF) or dCEF (Distributed CEF). This means IOS does not have to do a process context switch to forward a packet.
As a switching technology, NetFlow was replaced around 1995 by Cisco Express Forwarding. This first appeared on Cisco 12000 routers, and later replaced NetFlow switching on advanced IOS for the Cisco 7200 and Cisco 7500. As of 2012, technologies similar to NetFlow switching are still in use in most firewalls and software-based IP routers.
Cisco Express Forwarding (CEF) is an advanced layer 3 switching technology used mainly in large core networks or the Internet to enhance the overall network performance. . Although CEF is a Cisco proprietary protocol other vendors of multi-layer switches or high-capacity routers offer a similar functionality where layer-3 switching or routing is done in hardware (in an ASIC) instead of by ...
Cisco VIP 2-40, from an older generation of routers. Performance Route Processor, from the high-end Cisco 12000 series.. In routing, the data plane, sometimes called the forwarding plane or user plane, defines the part of the router architecture that decides what to do with packets arriving on an inbound interface.
In IP-based computer networks, virtual routing and forwarding (VRF) is a technology that allows multiple instances of a routing table to co-exist within the same router at the same time. One or more logical or physical interfaces may have a VRF and these VRFs do not share routes.
Default Forwarding (DF) PHB — which is typically best-effort traffic; Expedited Forwarding (EF) PHB — dedicated to low-loss, low-latency traffic; Assured Forwarding (AF) PHB — gives assurance of delivery under prescribed conditions; Class Selector PHBs — which maintain backward compatibility with the IP precedence field.
A forwarding information base (FIB), also known as a forwarding table or MAC table, is most commonly used in network bridging, routing, and similar functions to find the proper output network interface controller to which the input interface should forward a packet. It is a dynamic table that maps MAC addresses to ports.
Port forwarding via NAT router. In computer networking, port forwarding or port mapping is an application of network address translation (NAT) that redirects a communication request from one address and port number combination to another while the packets are traversing a network gateway, such as a router or firewall.