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Not all Cisco products run IOS. 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. 0 to 15, and can only be accessed by users with the necessary privilege. Through the CLI, the commands available to each privilege level can be defined.
More than 100 configuration modes and submodes. Train” is Cisco-speak for, “a vehicle for delivering Cisco software to a specific set of platforms and features. Often a rebuild is compiled to fix a single specific problem or vulnerability for a given IOS version. E14 is a Rebuild, the 14 denoting the 14th rebuild of 12. Rebuilds are produced to either quickly repair a defect, or to satisfy customers who do not want to upgrade to a later major revision because they may be running critical infrastructure on their devices, and hence prefer to minimise change and risk. Are usually produced on a weekly basis, and form a roll-up of current development effort.
Rigorously tested releases that are made available and include enhancements and bug fixes. Cisco recommend upgrading to Maintenance releases where possible, over Interim and Rebuild releases. Cisco says, “A train is a vehicle for delivering Cisco software to a specific set of platforms and features. Trains more or less map onto distinct markets or groups of customers that Cisco is targeting. The previous technology train becomes the source for the current mainline train — for example, the 12.
1T train becomes the basis for the 12. Therefore, to determine the features available in a particular mainline release, look at the previous T train release. In releases prior to Cisco IOS Release 12. Cisco doesn’t recommend usage of T train in production environments unless there is urgency to implement a certain T train’s new IOS feature. Enterprise train, is customized for implementation in enterprise environments. Special Release train, contains one-off releases designed to fix a certain bug or provide a new feature.
These are eventually merged with one the above trains. There were other trains from time to time, designed for specific needs — for example, the 12. 0AA train contained new code required for Cisco’s AS5800 product. This train includes both extended maintenance releases and standard maintenance releases.
Cisco will provide bug fixes for 44 months. Cisco will only provide bug fixes for 18 months. Beginning with the 1900, 2900 and 3900 series of ISR Routers, Cisco revised the licensing model of IOS. 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. VPN, Firewall, IP SLAs, NAC. 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.