Specifications

69
Release Notes for Cisco 7000 Family for Cisco IOS Release 12.1 T
78-10811-05
New and Changed Information
Event MIB
Platforms: Cisco 7200 series and Cisco 7500 series routers
The Event MIB is an asynchronous notification mechanism standardized for use by network
management systems using Simple Network Management Protocol (SNMP).
The Event MIB provides the ability to monitor the Cisco Management Information Base (MIB) objects
on the local or remote system using SNMP and take simple action whenever a trigger condition is met.
By allowing notifications based on events, the Network Management Server does not need to constantly
poll managed devices to find out if something has changed.
Support of the Event MIB has been added to Cisco IOS software to work with existing network
management systems and, when combined with the currently integrated Expression MIB support,
provides a flexible and efficient way to monitor complex conditions on network devices. By allowing
SNMP notifications to take place only when a specified condition occurs, Event MIB support reduces
the load on affected devices, significantly improving the scalability of network management solutions.
Expression MIB Support of Delta, Wildcarding, and Aggregation
Platforms: Cisco 7100 series and Cisco 7200 series routers
This feature adds support of the Delta, Wildcarding, and Aggregation features in the Distributed
Management Expression MIB (EXPRESSION-MIB) to Cisco IOS software for use by SNMP.
The Delta function enables the Expression MIB to use Delta values of an object instead of absolute
values when evaluating an expression. Delta is obtained by taking the difference between the current
value of an object and its previous value.
The Wildcarding function of the Expression MIB allows evaluation of multiple instances of an object.
This is useful in cases when an expression needs to be applied to all instances of an object. You do not
need not individually specify all instances of an object in the expression. Rather, you only need to set
the expWildcardedObject in expObjectTable to TRUE for the respective object.
Aggregation is performed using the sum function in the Expression MIB. The operand to the sum
function must be a wildcarded object. The result of the sum function is the sum of values of all instances
of the wildcarded object.
For a complete description of Expression MIB functionality, see the Distributed Management
Expression MIB Internet-Draft document, available through the ITEF at
http://www.ietf.org/ids.by.wg/disman.html.
Frame Relay ELMI Address Registration
Platforms: Cisco 7200 series and Cisco 7500 series routers
The Frame Relay ELMI Address Registration feature enables a network management system (NMS) to
detect connectivity among the switches and routers in a network using the Enhanced Local Management
Interface (ELMI) protocol. During ELMI version negotiation, neighboring devices exchange their
management IP addresses and ifIndex. The NMS polls the devices to collect this connectivity
information.
Before this feature was introduced, NMSs could detect only the topology of routers or the topology of
switches. This feature enables the NMS to detect switch and router interconnection and create an
end-to-end network topology map for network administrators.
The Cisco Frame Relay MIB has been enhanced to support the new ELMI information. The NMS uses
the MIB to extract the IP address and ifIndex of devices neighboring the managed device.