Chapter 5 Troubleshooting Cisco HSI Alarms

Alarms Overview

Table 5-1 Alarm Severity Levels

Severity Level

Description

 

 

Critical

A serious problem exists in the network. Clear critical alarms immediately.

 

A critical alarm should force an automatic restart of the application.

 

 

Major

A disruption of service has occurred. Clear this alarm immediately.

 

 

Minor

No disruption of service has occurred, but clear this alarm as soon as

 

possible.

 

 

Informational

An abnormal condition has occurred. It is transient and does not require

 

corrective action. (An invalid protocol call state transition is an example of

 

an event that prompts such an alarm.) No corrective action is required by

 

the management center to fix the problem.

 

 

Retrieving and Reporting Alarms

Events with a severity level of critical, major, or minor are classified as alarms and can be retrieved through the Man-Machine Language (MML) interface and a Simple Network Management Protocol (SNMP) manager.

An alarm must be reported when an alarm state changes (assuming the alarm does not have an unreported severity).

Informational Event Requirements

Informational events do not require state changes. An informational event is a warning that an abnormal condition that does not require corrective action has occurred. An invalid protocol call state transition is an example of an informational event. The informational event needs to be reported, but it is transient. No corrective action is required by the management center to fix the problem.

An informational event is reported once, upon occurrence, through the MML and SNMP interfaces. The MML interface must be in the rtrv-alms:contmode for the event to be displayed. The event is not displayed in subsequent rtrv-almscommands.

SNMP Trap Types

Alarms have SNMP trap types associated with them. Table 6-2 identifies the trap types.

Table 5-2 SNMP Trap Types

Trap Type

Trap Description

 

 

0

No error

 

 

1

Communication alarm

 

 

2

Quality of service

 

 

3

Processing error

 

 

4

Equipment error

 

 

5

Environment error

 

 

 

Cisco H.323 Signaling Interface User Guide

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OL-4806-01 Rev. A14

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Cisco Systems H.323 manual Snmp Trap Types, Retrieving and Reporting Alarms, Informational Event Requirements
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H.323 specifications

Cisco Systems H.323 is a set of standards designed for transmitting audio, video, and data over packet-switched networks. It is a critical technology that enables real-time communication and has become integral to the world of VoIP (Voice over Internet Protocol) and video conferencing applications. Originally developed by the ITU-T, H.323 has been widely adopted and implemented by Cisco Systems, allowing organizations to leverage reliable and scalable communication solutions.

One of the standout features of H.323 is its ability to support interoperability among varying equipment and platforms. This means that devices from different manufacturers can communicate seamlessly, which is vital in a diverse technical environment. H.323 does this by defining protocols that handle signaling, media transport, and control, ensuring that various systems can work together effectively.

Key technologies utilized within H.323 include H.225 and H.245 signaling protocols. H.225 is responsible for call setup and management, establishing communication between endpoints. In contrast, H.245 manages the negotiation of media channels, allowing devices to configure themselves based on the capabilities of each other. This adaptability is crucial for dynamic network conditions typical in VoIP applications.

Another defining characteristic of H.323 is its support for multiple types of multimedia communication, including point-to-point and multipoint calls. This flexibility supports everything from simple audio calls to complex videoconferencing setups, where many participants can share video and audio streams concurrently. Cisco enhances this capability through its hardware and software offerings, optimizing performance for conference calls.

H.323 also features robust error resilience mechanisms. This ensures that real-time data, which is typically sensitive to delays and losses, can be transmitted with minimal disruption. Moreover, it facilitates quality of service (QoS) implementation, allowing organizations to prioritize voice and video traffic over less critical data services, thereby improving the overall user experience.

In conclusion, Cisco Systems H.323 stands out as a comprehensive solution for real-time communication over packet-based networks. Its main features, including interoperability, multimedia support, and enhanced error resilience, position it as a relevant technology in both corporate and personal communication settings. As organizations continue to adopt cloud and hybrid communication models, H.323 remains a reliable backbone for ensuring connectivity and collaboration across diverse platforms.
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