Check Twamp Operation

This scenario shows how to configure Network Service Monitor (NSM) operations to measure network quality using active traffic probes and the TWAMP protocol. In addition, the TWAMP NSM responder service is configured.

Test IPv4 Destination

Description

In this scenario, TWAMP NSM operations are configured in DUT0 (using an IPv4 destination address) and the TWAMP NSM responder service is configured in DUT1.

Scenario

Step 1: Set the following configuration in DUT1:

set interfaces ethernet eth0 address 10.215.200.100/24
set service nsm responder type twamp port 12345
set system login user admin authentication encrypted-password '$6$GSjsCj8gHLv$/VcqU6FLi6CT2Oxn0MJQ2C2tqnRDrYKNF8HIYWJp68nvXvPdFccDsT04.WtigUONbKYrgKg8d6rEs8PjljMkH0'

Step 2: Set the following configuration in DUT0:

set interfaces ethernet eth0 address 10.215.200.50/24
set service nsm operation A alarm al_jitter activate jitter 0.1
set service nsm operation A alarm al_loss activate loss 5
set service nsm operation A alarm al_rtt activate rtt 0.2
set service nsm operation A destination-address 10.215.200.100
set service nsm operation A destination-port 12345
set service nsm operation A interval 0.05
set service nsm operation A local-interface eth0
set service nsm operation A type twamp
set service nsm operation A window 100
set system alarm al_jitter
set system alarm al_loss
set system alarm al_rtt
set system login user admin authentication encrypted-password '$6$GSjsCj8gHLv$/VcqU6FLi6CT2Oxn0MJQ2C2tqnRDrYKNF8HIYWJp68nvXvPdFccDsT04.WtigUONbKYrgKg8d6rEs8PjljMkH0'

Step 3: Run command system alarm show at DUT0 and check if output matches the following regular expressions:

(al_loss)\s+(false)
(al_rtt)\s+(false)
(al_jitter)\s+(false)

Step 4: Run command service nsm operation show at DUT0 and check if output matches the following regular expressions:

(al_loss)\s+(false)
(al_rtt)\s+(false)
(al_jitter)\s+(false)

Note

The previous command output should show that NSM operations have been successfully created and that alarms are desactivated (since the network quality is good).

Note

If a packet loss rate of 50% is emulated in the network and we wait a reasonable amount of time, NSM operation will detect this packet loss in the network and trigger the ‘al_loss’ alarm.

Step 5: Modify the following configuration lines in DUT0:

set interfaces ethernet eth0 traffic control out PLOSS
set traffic control PLOSS type network-emulator packet-loss 50

Step 6: Run command system alarm show at DUT0 and check if output matches the following regular expressions:

(al_loss)\s+(true)

Step 7: Run command service nsm operation show at DUT0 and check if output matches the following regular expressions:

(al_loss)\s+(true)

Note

The previous command output should show that the ‘al_loss’ alarm is activated, since packet losses on the network are greater than the configured threshold. In this scenario, the delay and jitter values are also affected, meaning the ‘al_rtt’ and ‘al_jitter’ alarms also go off (since their configured threshold is also exceeded).

Note

If the packet loss emulated in the network is removed and we wait a reasonable amount of time, NSM operation will detect packets are no longer being lost and will deactivate the ‘al_loss’ alarm.

Step 8: Modify the following configuration lines in DUT0:

delete interfaces ethernet eth0 traffic

Step 9: Run command system alarm show at DUT0 and check if output matches the following regular expressions:

(al_loss)\s+(false)
(al_rtt)\s+(false)
(al_jitter)\s+(false)

Step 10: Run command service nsm operation show at DUT0 and check if output matches the following regular expressions:

(al_loss)\s+(false)
(al_rtt)\s+(false)
(al_jitter)\s+(false)

Note

The previous command output should show that alarms are deactivated (since the network quality is good).

Note

If an additional delay of 900 ms is emulated in the network and we wait a reasonable amount of time, NSM operation will detect a delay in the network and will trigger the ‘al_rtt’ alarm.

Step 11: Modify the following configuration lines in DUT0:

set interfaces ethernet eth0 traffic control out RTT
set traffic control RTT type network-emulator network-delay 900

Step 12: Run command system alarm show at DUT0 and check if output matches the following regular expressions:

(al_rtt)\s+(true)

Step 13: Run command service nsm operation show at DUT0 and check if output matches the following regular expressions:

(al_rtt)\s+(true)

Note

The previous command output should show that the ‘al_rtt’ alarm is activated, since delays on the network are greater than the configured threshold.

Note

If the additional delay emulated in the network is removed and we wait a reasonable amount of time, NSM operation will detect significant delays no longer exist and will deactivate the ‘al_rtt’ alarm.

Step 14: Modify the following configuration lines in DUT0:

delete interfaces ethernet eth0 traffic

Step 15: Run command system alarm show at DUT0 and check if output matches the following regular expressions:

(al_loss)\s+(false)
(al_rtt)\s+(false)
(al_jitter)\s+(false)

Step 16: Run command service nsm operation show at DUT0 and check if output matches the following regular expressions:

(al_loss)\s+(false)
(al_rtt)\s+(false)
(al_jitter)\s+(false)

Note

The previous command output should show the alarms are deactivated (since the network quality is good).

Note

If an additional jitter of 1000 ms is emulated in the network and we wait a reasonable amount of time, NSM operation will detect said jitter in the network and will trigger the ‘al_jitter’ alarm.

Step 17: Modify the following configuration lines in DUT0:

set interfaces ethernet eth0 traffic control out JITTER
set traffic control JITTER type network-emulator network-delay 1 jitter 1000

Step 18: Run command system alarm show at DUT0 and check if output matches the following regular expressions:

(al_jitter)\s+(true)

Step 19: Run command service nsm operation show at DUT0 and check if output matches the following regular expressions:

(al_jitter)\s+(true)

Note

The previous command output should show that the ‘al_jitter’ alarm is activated, since there is a jitter on the network greater than the configured threshold.

Note

If the additional jitter emulated in the network is removed and we wait a reasonable amount of time, NSM operation will no longer detect a jitter and will deactivate the ‘al_jitter’ alarm.

Step 20: Modify the following configuration lines in DUT0:

delete interfaces ethernet eth0 traffic

Step 21: Run command system alarm show at DUT0 and check if output matches the following regular expressions:

(al_loss)\s+(false)
(al_rtt)\s+(false)
(al_jitter)\s+(false)

Step 22: Run command service nsm operation show at DUT0 and check if output matches the following regular expressions:

(al_loss)\s+(false)
(al_rtt)\s+(false)
(al_jitter)\s+(false)

Note

The previous command output should show the alarms are deactivated (since the network quality is good).

Test IPv4 FQDN Destination

Description

In this scenario, TWAMP NSM operations are configured in DUT0 (using a Fully Qualified Domain Name as the IPv4 destination address) and the TWAMP NSM responder service is configured in DUT1.

Scenario

Step 1: Set the following configuration in DUT1:

set interfaces ethernet eth0 address 10.215.200.100/24
set service nsm responder type twamp port 12345
set system login user admin authentication encrypted-password '$6$GSjsCj8gHLv$/VcqU6FLi6CT2Oxn0MJQ2C2tqnRDrYKNF8HIYWJp68nvXvPdFccDsT04.WtigUONbKYrgKg8d6rEs8PjljMkH0'

Step 2: Set the following configuration in DUT0:

set interfaces ethernet eth0 address 10.215.200.50/24
set service dns static host-name testnsm alias test.nsm.fqdn
set service dns static host-name testnsm inet 10.215.200.100
set service nsm operation A alarm al_jitter activate jitter 0.1
set service nsm operation A alarm al_loss activate loss 5
set service nsm operation A alarm al_rtt activate rtt 0.2
set service nsm operation A destination-address test.nsm.fqdn
set service nsm operation A destination-port 12345
set service nsm operation A interval 0.05
set service nsm operation A local-interface eth0
set service nsm operation A type twamp
set service nsm operation A window 100
set system alarm al_jitter
set system alarm al_loss
set system alarm al_rtt
set system login user admin authentication encrypted-password '$6$GSjsCj8gHLv$/VcqU6FLi6CT2Oxn0MJQ2C2tqnRDrYKNF8HIYWJp68nvXvPdFccDsT04.WtigUONbKYrgKg8d6rEs8PjljMkH0'

Step 3: Run command system alarm show at DUT0 and check if output matches the following regular expressions:

(al_loss)\s+(false)
(al_rtt)\s+(false)
(al_jitter)\s+(false)

Step 4: Run command service nsm operation show at DUT0 and check if output matches the following regular expressions:

(al_loss)\s+(false)
(al_rtt)\s+(false)
(al_jitter)\s+(false)

Note

The previous command output should show that NSM operations have been successfully created and that alarms are desactivated (since the network quality is good).

Note

If a packet loss rate of 50% is emulated in the network and we wait a reasonable amount of time, NSM operation will detect this packet loss in the network and trigger the ‘al_loss’ alarm.

Step 5: Modify the following configuration lines in DUT0:

set interfaces ethernet eth0 traffic control out PLOSS
set traffic control PLOSS type network-emulator packet-loss 50

Step 6: Run command system alarm show at DUT0 and check if output matches the following regular expressions:

(al_loss)\s+(true)

Step 7: Run command service nsm operation show at DUT0 and check if output matches the following regular expressions:

(al_loss)\s+(true)

Note

The previous command output should show that the ‘al_loss’ alarm is activated, since packet losses on the network are greater than the configured threshold. In this scenario, the delay and jitter values are also affected, meaning the ‘al_rtt’ and ‘al_jitter’ alarms also go off (since their configured threshold is also exceeded).

Note

If the packet loss emulated in the network is removed and we wait a reasonable amount of time, NSM operation will detect packets are no longer being lost and will deactivate the ‘al_loss’ alarm.

Step 8: Modify the following configuration lines in DUT0:

delete interfaces ethernet eth0 traffic

Step 9: Run command system alarm show at DUT0 and check if output matches the following regular expressions:

(al_loss)\s+(false)
(al_rtt)\s+(false)
(al_jitter)\s+(false)

Step 10: Run command service nsm operation show at DUT0 and check if output matches the following regular expressions:

(al_loss)\s+(false)
(al_rtt)\s+(false)
(al_jitter)\s+(false)

Note

The previous command output should show that alarms are deactivated (since the network quality is good).

Note

If an additional delay of 900 ms is emulated in the network and we wait a reasonable amount of time, NSM operation will detect a delay in the network and will trigger the ‘al_rtt’ alarm.

Step 11: Modify the following configuration lines in DUT0:

set interfaces ethernet eth0 traffic control out RTT
set traffic control RTT type network-emulator network-delay 900

Step 12: Run command system alarm show at DUT0 and check if output matches the following regular expressions:

(al_rtt)\s+(true)

Step 13: Run command service nsm operation show at DUT0 and check if output matches the following regular expressions:

(al_rtt)\s+(true)

Note

The previous command output should show that the ‘al_rtt’ alarm is activated, since delays on the network are greater than the configured threshold.

Note

If the additional delay emulated in the network is removed and we wait a reasonable amount of time, NSM operation will detect significant delays no longer exist and will deactivate the ‘al_rtt’ alarm.

Step 14: Modify the following configuration lines in DUT0:

delete interfaces ethernet eth0 traffic

Step 15: Run command system alarm show at DUT0 and check if output matches the following regular expressions:

(al_loss)\s+(false)
(al_rtt)\s+(false)
(al_jitter)\s+(false)

Step 16: Run command service nsm operation show at DUT0 and check if output matches the following regular expressions:

(al_loss)\s+(false)
(al_rtt)\s+(false)
(al_jitter)\s+(false)

Note

The previous command output should show the alarms are deactivated (since the network quality is good).

Note

If an additional jitter of 1000 ms is emulated in the network and we wait a reasonable amount of time, NSM operation will detect said jitter in the network and will trigger the ‘al_jitter’ alarm.

Step 17: Modify the following configuration lines in DUT0:

set interfaces ethernet eth0 traffic control out JITTER
set traffic control JITTER type network-emulator network-delay 1 jitter 1000

Step 18: Run command system alarm show at DUT0 and check if output matches the following regular expressions:

(al_jitter)\s+(true)

Step 19: Run command service nsm operation show at DUT0 and check if output matches the following regular expressions:

(al_jitter)\s+(true)

Note

The previous command output should show that the ‘al_jitter’ alarm is activated, since there is a jitter on the network greater than the configured threshold.

Note

If the additional jitter emulated in the network is removed and we wait a reasonable amount of time, NSM operation will no longer detect a jitter and will deactivate the ‘al_jitter’ alarm.

Step 20: Modify the following configuration lines in DUT0:

delete interfaces ethernet eth0 traffic

Step 21: Run command system alarm show at DUT0 and check if output matches the following regular expressions:

(al_loss)\s+(false)
(al_rtt)\s+(false)
(al_jitter)\s+(false)

Step 22: Run command service nsm operation show at DUT0 and check if output matches the following regular expressions:

(al_loss)\s+(false)
(al_rtt)\s+(false)
(al_jitter)\s+(false)

Note

The previous command output should show the alarms are deactivated (since the network quality is good).

Test IPv6 Destination

Description

In this scenario, TWAMP NSM operations are configured in DUT0 (using an IPv6 destination address) and the TWAMP NSM responder service is configured in DUT1.

Scenario

Step 1: Set the following configuration in DUT1:

set interfaces ethernet eth0 address '10::3/64'
set service nsm responder type twamp port 12345
set system login user admin authentication encrypted-password '$6$GSjsCj8gHLv$/VcqU6FLi6CT2Oxn0MJQ2C2tqnRDrYKNF8HIYWJp68nvXvPdFccDsT04.WtigUONbKYrgKg8d6rEs8PjljMkH0'

Step 2: Set the following configuration in DUT0:

set interfaces ethernet eth0 address '10::2/64'
set service nsm operation A alarm al_jitter activate jitter 0.1
set service nsm operation A alarm al_loss activate loss 5
set service nsm operation A alarm al_rtt activate rtt 0.2
set service nsm operation A destination-address '10::3'
set service nsm operation A destination-port 12345
set service nsm operation A interval 0.05
set service nsm operation A local-interface eth0
set service nsm operation A type twamp
set service nsm operation A window 100
set system alarm al_jitter
set system alarm al_loss
set system alarm al_rtt
set system login user admin authentication encrypted-password '$6$GSjsCj8gHLv$/VcqU6FLi6CT2Oxn0MJQ2C2tqnRDrYKNF8HIYWJp68nvXvPdFccDsT04.WtigUONbKYrgKg8d6rEs8PjljMkH0'

Step 3: Run command system alarm show at DUT0 and check if output matches the following regular expressions:

(al_loss)\s+(false)
(al_rtt)\s+(false)
(al_jitter)\s+(false)

Step 4: Run command service nsm operation show at DUT0 and check if output matches the following regular expressions:

(al_loss)\s+(false)
(al_rtt)\s+(false)
(al_jitter)\s+(false)

Note

The previous command output should show that NSM operations have been successfully created and that alarms are desactivated (since the network quality is good).

Note

If a packet loss rate of 50% is emulated in the network and we wait a reasonable amount of time, NSM operation will detect this packet loss in the network and trigger the ‘al_loss’ alarm.

Step 5: Modify the following configuration lines in DUT0:

set interfaces ethernet eth0 traffic control out PLOSS
set traffic control PLOSS type network-emulator packet-loss 50

Step 6: Run command system alarm show at DUT0 and check if output matches the following regular expressions:

(al_loss)\s+(true)

Step 7: Run command service nsm operation show at DUT0 and check if output matches the following regular expressions:

(al_loss)\s+(true)

Note

The previous command output should show that the ‘al_loss’ alarm is activated, since packet losses on the network are greater than the configured threshold. In this scenario, the delay and jitter values are also affected, meaning the ‘al_rtt’ and ‘al_jitter’ alarms also go off (since their configured threshold is also exceeded).

Note

If the packet loss emulated in the network is removed and we wait a reasonable amount of time, NSM operation will detect packets are no longer being lost and will deactivate the ‘al_loss’ alarm.

Step 8: Modify the following configuration lines in DUT0:

delete interfaces ethernet eth0 traffic

Step 9: Run command system alarm show at DUT0 and check if output matches the following regular expressions:

(al_loss)\s+(false)
(al_rtt)\s+(false)
(al_jitter)\s+(false)

Step 10: Run command service nsm operation show at DUT0 and check if output matches the following regular expressions:

(al_loss)\s+(false)
(al_rtt)\s+(false)
(al_jitter)\s+(false)

Note

The previous command output should show that alarms are deactivated (since the network quality is good).

Note

If an additional delay of 900 ms is emulated in the network and we wait a reasonable amount of time, NSM operation will detect a delay in the network and will trigger the ‘al_rtt’ alarm.

Step 11: Modify the following configuration lines in DUT0:

set interfaces ethernet eth0 traffic control out RTT
set traffic control RTT type network-emulator network-delay 900

Step 12: Run command system alarm show at DUT0 and check if output matches the following regular expressions:

(al_rtt)\s+(true)

Step 13: Run command service nsm operation show at DUT0 and check if output matches the following regular expressions:

(al_rtt)\s+(true)

Note

The previous command output should show that the ‘al_rtt’ alarm is activated, since delays on the network are greater than the configured threshold.

Note

If the additional delay emulated in the network is removed and we wait a reasonable amount of time, NSM operation will detect significant delays no longer exist and will deactivate the ‘al_rtt’ alarm.

Step 14: Modify the following configuration lines in DUT0:

delete interfaces ethernet eth0 traffic

Step 15: Run command system alarm show at DUT0 and check if output matches the following regular expressions:

(al_loss)\s+(false)
(al_rtt)\s+(false)
(al_jitter)\s+(false)

Step 16: Run command service nsm operation show at DUT0 and check if output matches the following regular expressions:

(al_loss)\s+(false)
(al_rtt)\s+(false)
(al_jitter)\s+(false)

Note

The previous command output should show the alarms are deactivated (since the network quality is good).

Note

If an additional jitter of 1000 ms is emulated in the network and we wait a reasonable amount of time, NSM operation will detect said jitter in the network and will trigger the ‘al_jitter’ alarm.

Step 17: Modify the following configuration lines in DUT0:

set interfaces ethernet eth0 traffic control out JITTER
set traffic control JITTER type network-emulator network-delay 1 jitter 1000

Step 18: Run command system alarm show at DUT0 and check if output matches the following regular expressions:

(al_jitter)\s+(true)

Step 19: Run command service nsm operation show at DUT0 and check if output matches the following regular expressions:

(al_jitter)\s+(true)

Note

The previous command output should show that the ‘al_jitter’ alarm is activated, since there is a jitter on the network greater than the configured threshold.

Note

If the additional jitter emulated in the network is removed and we wait a reasonable amount of time, NSM operation will no longer detect a jitter and will deactivate the ‘al_jitter’ alarm.

Step 20: Modify the following configuration lines in DUT0:

delete interfaces ethernet eth0 traffic

Step 21: Run command system alarm show at DUT0 and check if output matches the following regular expressions:

(al_loss)\s+(false)
(al_rtt)\s+(false)
(al_jitter)\s+(false)

Step 22: Run command service nsm operation show at DUT0 and check if output matches the following regular expressions:

(al_loss)\s+(false)
(al_rtt)\s+(false)
(al_jitter)\s+(false)

Note

The previous command output should show the alarms are deactivated (since the network quality is good).

Test IPv6 FQDN Destination

Description

In this scenario, TWAMP NSM operations are configured in DUT0 (using a Fully Qualified Domain Name as the IPv6 destination address) and the TWAMP NSM responder service is configured in DUT1.

Scenario

Step 1: Set the following configuration in DUT1:

set interfaces ethernet eth0 address '10::3/64'
set service nsm responder type twamp port 12345
set system login user admin authentication encrypted-password '$6$GSjsCj8gHLv$/VcqU6FLi6CT2Oxn0MJQ2C2tqnRDrYKNF8HIYWJp68nvXvPdFccDsT04.WtigUONbKYrgKg8d6rEs8PjljMkH0'

Step 2: Set the following configuration in DUT0:

set interfaces ethernet eth0 address '10::2/64'
set service dns static host-name testnsm alias test.nsm.fqdn
set service dns static host-name testnsm inet '10::3'
set service nsm operation A alarm al_jitter activate jitter 0.1
set service nsm operation A alarm al_loss activate loss 5
set service nsm operation A alarm al_rtt activate rtt 0.2
set service nsm operation A destination-address test.nsm.fqdn
set service nsm operation A destination-port 12345
set service nsm operation A interval 0.05
set service nsm operation A local-interface eth0
set service nsm operation A type twamp
set service nsm operation A window 100
set system alarm al_jitter
set system alarm al_loss
set system alarm al_rtt
set system login user admin authentication encrypted-password '$6$GSjsCj8gHLv$/VcqU6FLi6CT2Oxn0MJQ2C2tqnRDrYKNF8HIYWJp68nvXvPdFccDsT04.WtigUONbKYrgKg8d6rEs8PjljMkH0'

Step 3: Run command system alarm show at DUT0 and check if output matches the following regular expressions:

(al_loss)\s+(false)
(al_rtt)\s+(false)
(al_jitter)\s+(false)

Step 4: Run command service nsm operation show at DUT0 and check if output matches the following regular expressions:

(al_loss)\s+(false)
(al_rtt)\s+(false)
(al_jitter)\s+(false)

Note

The previous command output should show that NSM operations have been successfully created and that alarms are desactivated (since the network quality is good).

Note

If a packet loss rate of 50% is emulated in the network and we wait a reasonable amount of time, NSM operation will detect this packet loss in the network and trigger the ‘al_loss’ alarm.

Step 5: Modify the following configuration lines in DUT0:

set interfaces ethernet eth0 traffic control out PLOSS
set traffic control PLOSS type network-emulator packet-loss 50

Step 6: Run command system alarm show at DUT0 and check if output matches the following regular expressions:

(al_loss)\s+(true)

Step 7: Run command service nsm operation show at DUT0 and check if output matches the following regular expressions:

(al_loss)\s+(true)

Note

The previous command output should show that the ‘al_loss’ alarm is activated, since packet losses on the network are greater than the configured threshold. In this scenario, the delay and jitter values are also affected, meaning the ‘al_rtt’ and ‘al_jitter’ alarms also go off (since their configured threshold is also exceeded).

Note

If the packet loss emulated in the network is removed and we wait a reasonable amount of time, NSM operation will detect packets are no longer being lost and will deactivate the ‘al_loss’ alarm.

Step 8: Modify the following configuration lines in DUT0:

delete interfaces ethernet eth0 traffic

Step 9: Run command system alarm show at DUT0 and check if output matches the following regular expressions:

(al_loss)\s+(false)
(al_rtt)\s+(false)
(al_jitter)\s+(false)

Step 10: Run command service nsm operation show at DUT0 and check if output matches the following regular expressions:

(al_loss)\s+(false)
(al_rtt)\s+(false)
(al_jitter)\s+(false)

Note

The previous command output should show that alarms are deactivated (since the network quality is good).

Note

If an additional delay of 900 ms is emulated in the network and we wait a reasonable amount of time, NSM operation will detect a delay in the network and will trigger the ‘al_rtt’ alarm.

Step 11: Modify the following configuration lines in DUT0:

set interfaces ethernet eth0 traffic control out RTT
set traffic control RTT type network-emulator network-delay 900

Step 12: Run command system alarm show at DUT0 and check if output matches the following regular expressions:

(al_rtt)\s+(true)

Step 13: Run command service nsm operation show at DUT0 and check if output matches the following regular expressions:

(al_rtt)\s+(true)

Note

The previous command output should show that the ‘al_rtt’ alarm is activated, since delays on the network are greater than the configured threshold.

Note

If the additional delay emulated in the network is removed and we wait a reasonable amount of time, NSM operation will detect significant delays no longer exist and will deactivate the ‘al_rtt’ alarm.

Step 14: Modify the following configuration lines in DUT0:

delete interfaces ethernet eth0 traffic

Step 15: Run command system alarm show at DUT0 and check if output matches the following regular expressions:

(al_loss)\s+(false)
(al_rtt)\s+(false)
(al_jitter)\s+(false)

Step 16: Run command service nsm operation show at DUT0 and check if output matches the following regular expressions:

(al_loss)\s+(false)
(al_rtt)\s+(false)
(al_jitter)\s+(false)

Note

The previous command output should show the alarms are deactivated (since the network quality is good).

Note

If an additional jitter of 1000 ms is emulated in the network and we wait a reasonable amount of time, NSM operation will detect said jitter in the network and will trigger the ‘al_jitter’ alarm.

Step 17: Modify the following configuration lines in DUT0:

set interfaces ethernet eth0 traffic control out JITTER
set traffic control JITTER type network-emulator network-delay 1 jitter 1000

Step 18: Run command system alarm show at DUT0 and check if output matches the following regular expressions:

(al_jitter)\s+(true)

Step 19: Run command service nsm operation show at DUT0 and check if output matches the following regular expressions:

(al_jitter)\s+(true)

Note

The previous command output should show that the ‘al_jitter’ alarm is activated, since there is a jitter on the network greater than the configured threshold.

Note

If the additional jitter emulated in the network is removed and we wait a reasonable amount of time, NSM operation will no longer detect a jitter and will deactivate the ‘al_jitter’ alarm.

Step 20: Modify the following configuration lines in DUT0:

delete interfaces ethernet eth0 traffic

Step 21: Run command system alarm show at DUT0 and check if output matches the following regular expressions:

(al_loss)\s+(false)
(al_rtt)\s+(false)
(al_jitter)\s+(false)

Step 22: Run command service nsm operation show at DUT0 and check if output matches the following regular expressions:

(al_loss)\s+(false)
(al_rtt)\s+(false)
(al_jitter)\s+(false)

Note

The previous command output should show the alarms are deactivated (since the network quality is good).