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This means IOS does not have to do a process context switch to forward a packet.
Routing functions such as OSPF or BGP run at the process level.
The Cisco advisory web site may list more than one possible interim to fix an associated issue (the reason for this is unknown to the general public).
Maintenance releases – Rigorously tested releases that are made available and include enhancements and bug fixes.
Routers come with IP Base installed, and additional feature pack licenses can be installed as bolt-on additions to expand the feature set of the device.
The available feature packs are: An Interface Descriptor Block, or simply IDB, is a portion of memory or Cisco IOS internal data structure that contains information such as the IP address, interface state, and packet statistics for networking data.
Cisco IOS (originally Internetwork Operating System) is a family of software used on most Cisco Systems routers and current Cisco network switches.
Cisco says, "A train is a vehicle for delivering Cisco software to a specific set of platforms and features." Before Cisco IOS release 15, releases are split into several trains, each containing a different set of features.
The set available is determined by the "mode" and the privilege level of the current user.
"Global configuration mode" provides commands to change the system's configuration, and "interface configuration mode" provides commands to change the configuration of a specific interface.
In all versions of Cisco IOS, packet routing and forwarding (switching) are distinct functions.
Routing and other protocols run as Cisco IOS processes and contribute to the Routing Information Base (RIB).
There is no memory protection between processes, which means that bugs in IOS code can potentially corrupt data used by other processes.