If you meanIDB, the following is from "Designing Cisco Networks" Module2,
Section 3
Interface Description Blocks (IDBs) provide a central location in memory for
storing information about network interface cards for use by driver code. An
IDB must be able to represent all kinds of interfaces, including
subinterfaces. Therefore, IDB data structures use a lot of memory. To avoid
problems with memory usage, the Cisco IOS software limits the number of
IDBs.
The current IDB limit is 300. Each physical interface on the router, whether
it is configured or not, and whether it is active or shut down, uses up one
IDB.
Each configured channel on a channelized interface (such as the MIP) uses
one IDB. For example, if a MIP T1 port has 24 configured channels, the
interface uses a total of 24 IDBs.
Each configured subinterface also uses one IDB. For example, if an FSIP port
configured for Frame Relay has 10 configured subinterfaces, the interface
uses up a total of 11 IDBs (one for the physical interface and one each for
the subinterfaces).
Only the subinterfaces use IDBs, not Frame Relay permanent virtual circuits
(PVCs). For example, if a Frame Relay interface has ten PVCs, but does not
use any subinterfaces, it uses only a single IDB. If a Frame Relay interface
has two subinterfaces each terminating five PVCs (for a total of ten PVCs at
the interface), it uses three IDBs.
"John W. Redmond" <[EMAIL PROTECTED]> wrote in message
[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> Hey everyone,
>
> What does IBD represent in a cisco environment?
>
> Thanks,
>
> JOHN
>
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