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Link Bandwidth Monitoring

T-Server provides bandwidth monitoring on a CTI link and can notify the Genesys Management Layer when the Configuration Layer limits are exceeded.

When configured high or low thresholds are reached, T-Server sends either of the following alarm messages, as appropriate:

  • MSG_TS_COMMON_LINK_ALARM_HIGH LMS
  • MSG_TS_COMMON_LINK_ALARM_LOW LMS

High and Low Watermarks

  • The link-alarm-high option, specified as a percentage of the max-bandwidth value, defines an upper threshold bandwidth value which when breached raises a MSG_TS_COMMON_LINK_ALARM_HIGH LMS message.
  • The link-alarm-low option, specified as a percentage of the max-bandwidth value, defines a lower threshold bandwidth value which when breached raises a MSG_TS_COMMON_LINK_ALARM_LOW LMS message.

Alarm Set Algorithm

T-Server measures requests sent to the CTI link, and whenever there is a 99.7% probability that a high or low watermark threshold has been crossed, an appropriate LMS message is generated.

If the link-alarm-high option is set to 0 (zero), no high alarm is generated.

Note: A high or low watermark LMS message is only generated when there is at least a 99.7% probability that the requisite threshold has been crossed. Therefore, if the link-alarm-low option is set to 0 (zero), it cannot be crossed and no low alarm can be generated. Since a subsequent high alarm LMS message is only generated after a low watermark message, no further alarms can be raised.

LMS Messages

High alarm

STANDARD Link bandwidth: %d1 requests per second exceeds alarm threshold %d2 requests per second on CTI link ID %d3

Attributes:

  • %d1 represents estimated requests rate
  • %d2 represents link-alarm-high * max_bandwidth / 100
  • %d3 represents the CTI Link ID

Low alarm

STANDARD Link bandwidth: %d1 requests per second dropped below alarm threshold %d2 requests per second on CTI link ID %d3

Attributes:

  • %d1 represents estimated requests rate
  • %d2 represents link-alarm-low * max_bandwidth / 100
  • %d3 represents the CTI Link ID

Setting the link-alarm-low option to a value of 0 (zero) will not create a link alarm low LMS message. The link bandwidth must drop below the set low alarm level in order to create the low watermark message. For a high watermark, the bandwidth recorded must exceed the set high alarm watermark to create the high watermark LMS message. The consequence of setting the low alarm watermark to 0 (zero) is that T-Server will only generate one high watermark LMS message since a low watermark LMS message is never created. Therefore, T-Server will remain in high watermark alarm state indefinitely and will never generate a subsequent LMS high watermark message.

If the link-alarm-low option is set to a value higher than the value of the link-alarm-high option, then the two values are swapped. However, the values are not swapped if either value is set to 0 (zero).

See the LinkLoad Extensions attribute for more information about the link bandwidth feature.

HA Considerations

If the primary T-Server is at the high watermark prior to a switchover, its state is not transferred to the backup T-Server.

This page was last edited on June 14, 2013, at 16:40.

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