RFC 2128 (rfc2128) - Page 3 of 34
Dial Control Management Information Base using SMIv2
Alternative Format: Original Text Document
RFC 2128 Dial Control MIB March 1997
o Information to retain call history.
The MIB, therefore, is structured into four groups.
o The dialCtlConfiguration group is used to specify general
configuration information.
o The dialCtlPeer group is used to describe peer configuration
and peer statistics.
o The callActive group is used to store active call information.
o The callHistory group is used to store call history information.
These calls could be circuit switched or they could be virtual
circuits. History of each and every call is stored, of successful
calls as well as unsuccessful and rejected calls. An entry will
be created when a call is cleared.
2.2. Relationship to the Interfaces MIB
This section clarifies the relationship of this MIB to the Interfaces
MIB [8]. Several areas of correlation are addressed in the following
subsections. The implementor is referred to the Interfaces MIB
document in order to understand the general intent of these areas.
2.2.1. Layering Model and Virtual Circuits
On an occasional access channel, there are a number of peer systems
that are permitted to call or be called, all of which need to be
treated as active from a routing viewpoint, but most of which have no
call in progress at any given time.
On dialup interfaces, this is further complicated by the fact that
calls to a given peer float from channel to channel. One cannot
definitively say "I call this peer on that interface." It is
necessary, therefore, to provide a mapping algorithm between the
low-level interfaces, and the various logical interfaces supporting
the peers. This is solved by creating a logical interface (ifEntry)
for each peer and a logical interface (ifEntry) for each low-level
interface. These are then correlated using the ifStackTable.
The low-level interfaces are either physical interfaces, e.g. modem
interfaces, or logical interfaces, e.g. ISDN B channels, which then
in turn are layered on top of physical ISDN interfaces.
Roeck Standards Track