Understanding Y.1731 Performance Monitoring
When service providers sell connectivity services to a subscriber, a Service Level Agreement (SLA) is reached between the buyer and seller of the service. The SLA defines the attributes offered by a provider and serves as a legal obligation on the service provider. As the level of performance required by subscribers increases, service providers need to monitor the performance parameters being offered. In order to capture the needs of the service providers, organizations have defined various standards such as IEEE 802.1ag and ITU-T Y.1731 that define the methods and frame formats used to measure performance parameters.
Y.1731 Performance Monitoring (PM) provides a standard ethernet PM function that includes measurement of ethernet frame delay, frame delay variation, frame loss, and frame throughput measurements specified by the ITU-T Y-1731 standard and interpreted by the Metro Ethernet Forum (MEF) standards group. As per recommendations, the ME 3600X and ME3800X switches should be able to send, receive and process PM frames in intervals of 1000ms (1 frame per second) with the maximum recommended transmission period being 1000ms (1 frame per second) for any given service.
To measure SLA parameters such as frame delay or frame delay variation, a small number of synthetic frames are transmitted along with the service to the end point of the maintenance region, where the Maintenance End Point (MEP) responds to the synthetic frame. For a function such as connectivity fault management, the messages are sent less frequently, while performance monitoring frames are sent more frequently.
Figure 49-1 illustrates Maintenance Entities (ME) and Maintenance End Points (MEP) typically involved in a point-to-point metro ethernet deployment for the Y.1731 standard.
Figure 49-1 A Point-to-Point Metro Ethernet Deployment with Typical Maintenance Entities and Maintenance Points
Following are the performance monitoring parameters:
- Connectivity
- Frame Delay and Frame Delay Variation
- Frame Loss Ratio and Availability
Connectivity
The first step to performance monitoring is verifying the connectivity. Continuity Check Messages (CCM) are best suited for connectivity verification, but is optimized for fault recovery operation. It is usually not accepted as a component of an SLA due to the timescale difference between SLA and Fault recovery. Hence, Connectivity Fault Management (CFM) and Continuity Check Database (CCDB) are used to verify connectivity. For more information on CFM see: Configuring Ethernet OAM, CFM, and E-LMI
Frame Delay and Frame Delay Variation
Ethernet frame Delay Measurement (ETH-DM) is used for on-demand ethernet Operations, Administration & Maintenance (OAM) to measure frame delay and frame delay variation.
Ethernet frame delay and frame delay variation are measured by sending periodic frames with ETH-DM information to the peer MEP and receiving frames with ETH-DM information from the peer MEP. During the interval, each MEP measures the frame delay and frame delay variation.
Ethernet frame delay measurement also collects useful information, such as worst and best case delays, average delay, and average delay variation. Ethernet frame delay measurement supports hardware-based timestamping in the ingress direction. It provides a runtime display of delay statistics during a two-way delay measurement. Ethernet frame delay measurement records the last 100 samples collected per remote Maintenance End Point (MEP) or per CFM session.
The following are methods of delay measurement defined by the ITU-T Y.1731 standards:
- One-way ETH-DM
- Two-way ETH-DM
One-way ETH-DM
Note
The one-way ETH-DM is supported only on the Cisco ME3600X-24CX-M Switch.
Each MEP transmits frames with one-way ETH-DM information to its peer MEP in a point-to-point ME. This transmission facilitates either one-way frame delay or one-way frame delay variation measurements, or both, at the peer MEP. One-way frame delay requires the PTP clock to be synchronized at both ends while the frame delay variation does not require a PTP clock synchronization. Frame delay is measured using a single delay measurement (1DM) or Delay Measurement Message (DMM) and Delay Measurement Reply (DMR) frame combination.
These are the prerequisites for 1DM measurements:
– The clocks of the two end-points must be synchronized accurately. This is achieved through either PTP/IEEE 1588-2002 or NTP. This function is supported only on the Cisco ME3600X-24CX-M Switch.
– There is no support to create auto-sessions (DMM sessions) on the peer or receiver. You must configure a receive-only session.
– You must configure all the create sessions (receiver sessions) on the receiver's datapath. The IP SLA 1DM receivers are passive listener sessions.
Two-way ETH-DM
Each MEP transmits frames with ETH-DM request information to its peer MEP and in turn receives frames with ETH-DM reply information. Two-way frame delay and frame delay variation are measured using DMM and DMR frames. The two-way ETH-DM is supported on both Cisco ME3600/ME3800 and the Cisco ME3600X-24CX-M Switches.
Frame Loss Ratio and Availability
Ethernet Synthetic Loss Measurement (ETH-SLM) is used to collect counter values applicable for ingress and egress synthetic frames where the counters maintain a count of transmitted and received synthetic frames between a pair of MEPs.
ETH-SLM transmits synthetic frames with ETH-SLM information to a peer MEP and similarly receives synthetic frames with ETH-SLM information from the peer MEP. Each MEP performs frame loss measurements which contribute to unavailable time. A near-end frame loss refers to frame loss associated with ingress data frames. Far-end frame loss refers to frame loss associated with egress data frames. Both near-end and far-end frame loss measurements contribute to near-end severely errored seconds and far end severely errored seconds which together contribute to unavailable time. ETH-SLM is measured using SLM and SLR frames.
There are two methods of frame loss measurement defined by the ITU-T Y.1731 standard, ETH-LM and ETH-SLM. Only single-ended ETH-SLM is supported:
- Single-ended ETH-SLM: Each MEP transmits frames with the ETH-SLM request information to its peer MEP and receives frames with ETH-SLM reply information from its peer MEP to carry out synthetic loss measurement.
ETH-SLM can be performed on a proactive or on-demand basis. On-demand ETH-SLM allows users without configuration access to perform real-time troubleshooting of Ethernet Services. On-Demand ETH-SLM supports two modes:
In direct mode the operations start and run immediately.
In referenced mode, the EXEC command references a previous-configured operation. DMMv1 and SLM probes are supported in continuous and burst mode.
Supported Interfaces
Y.1731 PM supports the following interfaces:
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Cisco ME3600X-24CX-M |
- SLM, DMM, 1DM, and DMMv1 support on EVC BD OFM
- SLM, DMM, 1DM, and DMMv1 support on PC EVC BD OFM
- SLM, DMM, 1DM, and DMMv1 support on EVC Xconnect OFM
- SLM, DMM, 1DM, and DMMv1 support on PC EVC Xconnect OFM
- SLM, DMM, 1DM, and DMMv1 support on EVC BD IFM
- SLM, DMM, 1DM, and DMMv1 support on PC EVC BD IFM
- SLM, DMM, 1DM, and DMMv1 support on EVC Xconnect IFM
- SLM, DMM, 1DM, and DMMv1 support on PC EVC Xconnect IFM
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Cisco ME3600/ME3800 |
- SLM, DMM, and DMMv1 support on EVC BD OFM
- SLM, DMM, and DMMv1 support on PC EVC BD OFM
- SLM, DMM, and DMMv1 support on EVC Xconnect OFM
- SLM, DMM, and DMMv1 support on PC EVC Xconnect OFM
- SLM, DMM, and DMMv1 support on EVC BD IFM
- SLM, DMM, and DMMv1 support on PC EVC BD IFM
- SLM, DMM, and DMMv1 support on EVC Xconnect IFM
- SLM, DMM, and DMMv1 support on PC EVC Xconnect IFM
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Note Performance Monitoring is supported in the EVC and CFM configurations mentioned above, with both Dot1q and QinQ encapsulations available on the EVC.
Restrictions for Y.1731 Performance Monitoring
Following are the restrictions for the Y.1731 PM on the switch:
- Y.1731 PM is not supported on the following interfaces:
– mLACP
– Switchport Upward-facing MEP and Downward-facing MEP
– Port MEPs
– L2VFI
- SNMP is supported as a read only object, although CLI and system-logging is supported. The reaction syslogs can be converted to traps using the Syslog Traps MIB
- Frame Throughput measurements are not supported
- Clock synchronization is not mandatory for Two-way Delay Measurement
Following are the restrictions for PM support on a port channel:
- Adding or deleting a member link renders the session invalid.
- PM is not supported on manual PC EVC Load balancing configuration (UNI LAG).
Configuring Y.1731 Performance Monitoring
Configuring One-Way Delay Measurement
To configure a one-way delay measurement, complete these steps:
Note Ensure you first configure a receiver, schedule it to the pending state, and then configure a sender.
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Step 1 |
enable |
Enables privileged EXEC mode. Enter your password if prompted. |
Step 2 |
configure terminal |
Enters global configuration mode. |
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Configuration on the receiver: |
Step 3 |
ip sla n |
Enables the IP SLA configuration. |
Step 4 |
ethernet y1731 delay receive 1DM domain domain {{ vlan | evc } value } cos value { mpid | mac-address } value |
Configures a one-way delay measurement on the receiver.
- evc - Specifies the ethernet virtual circuit identifier.
- vlan - Specifies the VLAN.
- cos - Specifies the class of service. The value ranges between 0 and 7.
- mpid - Specifies the local MP ID. The value ranges between 1 and 8191.
- mac-address - Specifies the local MAC-address.
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Step 5 |
frame {offset} value |
(Optional) configures this Y.1731 frame parameter:
offset - Specifies the frame offset to be used for calculations. The value ranges between 1 and 10. |
Step 6 |
history {interval} value |
(Optional) configures this Y.1731 history parameter:
interval - Specifies the number of intervals. The number of intervals ranges between 1 and 10. |
Step 7 |
aggregate {interval} value |
(Optional) configures this Y.1731 aggregation parameter:
interval - Specifies the number of intervals. The aggregation period in seconds ranges between 1 and 65535. |
Step 8 |
distribution {delay | delay-variation} {one-way | two-way} value |
(Optional) configures these Y.1731 distribution parameters:
- delay - Specifies delay distribution parameters.
- delay-variation - Specifies delay-variation distribution parameters.
- one-way - Specifies one-way distribution parameters.
- two-way - Specifies two-way distribution parameters.
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Step 9 |
max-delay value |
(Optional) configures the maximum delay in milliseconds. The value ranges between 1 and 65535. |
Step 10 |
owner value |
(Optional) specifies the operation owner. |
Step 11 |
exit |
Exits the Y.1731 submode and enters the global
configuration mode. |
Step 12 |
ip sla schedule n { life | ageout | recurring | start-time } value start-time start time |
Schedules the one-way delay measurement on the receiver.
- Life - Specifies the period time to execute in seconds.
- Ageout - Specifies the period time to keep the entry when inactive.
- Recurring - Specifies the probe to be scheduled automatically every day.
- Start-time - Specifies the time to start the entry. The options available are:
– after – hh:mm – hh:mm:ss – now – pending – random Note On the receiver, the selected scheduled start time should always be pending. |
Step 13 |
exit |
Exits global configuration mode. |
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Configuration on the sender: |
Step 14 |
ip sla n |
Enables the IP SLA configuration. |
Step 15 |
ethernet y1731 delay 1DM domain domain {{ vlan | evc } value }{ mpid | mac - address } value cos value source { mpid | mac-address } value |
Configures a one-way delay measurement on the sender:
- evc - Specifies the ethernet virtual circuit identifier.
- vlan - Specifies the VLAN.
- cos - Specifies the class of service. The value ranges between 0 and 7.
- mpid - Specifies the destination MP ID. The value ranges between 1 and 8191.
- mac-address - Specifies the destination MAC-address.
- source - Specifies the source MP ID or MAC-address.
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Step 16 |
frame {interval | size} value |
(Optional) configures these Y.1731 frame parameters:
- interval - Specifies the number of intervals.
- size - Specifies the frame size. The value ranges between 64 and 384.
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Step 17 |
history {interval} value |
(Optional) configures this Y.1731 history parameter:
interval - Specifies the number of intervals. The number of intervals ranges between 1 and 10. |
Step 18 |
aggregate {interval} value |
(Optional) configures this Y.1731 aggregation parameter:
interval - Specifies the number of intervals. The aggregation period in seconds ranges between 1 and 65535. |
Step 19 |
distribution {delay | delay-variation} {one-way | two-way} value |
(Optional) configures these Y.1731 distribution parameters:
- delay - Specifies delay distribution parameters.
- delay-variation - Specifies delay-variation distribution parameters.
- one-way - Specifies one-way distribution parameters.
- two-way - Specifies two-way distribution parameters.
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Step 20 |
max-delay value |
(Optional) configures the maximum delay in milliseconds. The value ranges between 1 and 65535. |
Step 21 |
owner value |
(Optional) specifies the operation owner. |
Step 22 |
exit |
Exits the Y.1731 submode and enters the global
configuration mode. |
Step 23 |
ip sla schedule n { life | ageout | recurring | start-time } value start-time start time |
Schedules the one-way delay measurement on the sender.
- Life - Specifies the period time to execute in seconds.
- Ageout - Specifies the period time to keep the entry when inactive.
- Recurring - Specifies the probe to be scheduled automatically every day.
- Start-time - Specifies the time to start the entry. The options available are:
– after – hh:mm – hh:mm:ss – now – pending |
Step 24 |
exit |
Exits the global configuration mode. |
Configuring Example
The following example configures a one-way frame delay measurement:
Switch# configure terminal
Switch(config-ip-sla)# ethernet y1731 delay receive 1DM domain r3 evc e3 cos 3 mpid 401
Switch(config-sla-y1731-delay)#history interval 5
Switch(config-sla-y1731-delay)#aggregate interval 60
Switch(config)#ip sla schedule 1 start-time pending
Switch(config-ip-sla)# Switch(config-ip-sla)# ethernet y1731 delay 1DM domain r3 evc e3
mpid 401 cos 3 source mpid 400
Switch(config-sla-y1731-delay)# history interval 5
Switch(config-sla-y1731-delay)# aggregate interval 60
Switch(config)#ip sla schedule 1 start-time after 00:00:30
Configuring Two-Way Delay Measurement
To configure a two-way delay measurement, complete these steps:
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Step 1 |
enable |
Enables privileged EXEC mode. Enter your password if prompted. |
Step 2 |
configure terminal |
Enters global configuration mode. |
Step 3 |
ip sla n |
Enables the IP SLA configuration. |
Step 4 |
ethernet y1731 delay { DMM | DMMv1}burst domain domain {{ vlan | evc } value }{ mpid | mac - address } value cos value source { mpid | mac-address } value |
Configures a two-way delay measurement on the sender.
- burst - Specifies the number of frames to be sent in the cycle.
- evc - Specifies the ethernet virtual circuit identifier
- vlan - Specifies the VLAN.
- cos - Specifies the class of service. The value ranges between 0 and 7.
- mpid - Specifies the destination MP ID. The value ranges between 1 and 8191.
- mac-address - Specifies the destination MAC-address.
- source - Specifies the source MP ID or MAC-address.
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Step 5 |
frame {interval | offset | size} value |
Configures these Y.1731 frame parameters:
- interval - Specifies the number of intervals.
- offset - Specifies the frame offset to be used for calculations. The value ranges between 1 and 10.
- size - Specifies the frame size. The value ranges between 64 and 384.
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Step 6 |
history {interval} value |
Configures this Y.1731 history parameter:
interval - Specifies the number of intervals. The number of intervals ranges between 1 and 10. |
Step 7 |
aggregate {interval} value |
Configures this Y.1731 aggregation parameter:
interval - Specifies the number of intervals. The aggregation period in seconds ranges between 1 and 65535. |
Step 8 |
distribution {delay | delay-variation} {one-way | two-way} value |
Configures these Y.1731 distribution parameters such as:
- delay - Specifies delay distribution parameters.
- delay-variation - Specifies delay-variation distribution parameters.
- one-way - Specifies one-way distribution parameters.
- two-way - Specifies two-way distribution parameters.
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Step 9 |
clock sync |
Checks whether the clocks are synchronized on the sender and receiver. |
Step 10 |
max-delay value |
Configures the maximum delay in milliseconds. The value ranges between 1 and 65535. |
Step 11 |
owner value |
Specifies the operation owner. |
Step 12 |
exit |
Exits the Y.1731 submode and enters the global configuration mode. |
Step 13 |
ip sla schedule n { life | ageout | recurring | start-time } value start-time start time |
Schedules the two way delay measurement on the sender.
- Life - Specifies the period time to execute in seconds.
- Ageout - Specifies the period time to keep the entry when inactive.
- Recurring - Specifies the probe to be scheduled automatically every day.
- Start-time - Specifies the time to start the entry. The options available are:
– after – hh:mm – hh:mm:ss – now – pending |
Step 14 |
exit |
Exits the global configuration mode. |
Configuration Example
The following example configures a two way frame delay measurement:
Switch# configure terminal
Switch(config-ip-sla)# ethernet y1731 delay DMM domain ifm_400 evc e1 mpid 401 cos 4 source mpid 1
Switch(config-sla-y1731-delay)# history interval 5
Switch(config-sla-y1731-delay)# aggregate interval 60
Switch(config-sla-y1731-delay)# exit
Switch(config)#ip sla schedule 1 start-time after 00:00:30
Configuring Single Ended Synthetic Loss Measurement
To configure single ended synthetic loss measurement, complete these steps:
Note Before you begin, configure the command monitor loss counter [priority cos range] under the EVC CFM sub-config mode for those interfaces that require loss monitoring.
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Step 1 |
enable |
Enables privileged EXEC mode. Enter your password if prompted. |
Step 2 |
configure terminal |
Enters global configuration mode. |
Step 3 |
ip sla n |
Enables the IP SLA configuration. |
Step 4 |
ethernet y1731 loss SLM domain domain {{ vlan | evc } value }{ mpid | mac - address } value cos value source { mpid | mac-address } value |
Configures single ended frame loss measurement on the sender.
- evc - Specifies the ethernet virtual circuit identifier
- vlan - Specifies the VLAN.
- cos - Specifies the class of service. The values ranges between 0 and 7. The COS value 7 is for aggregated COS and is used when LMM is configured for routed port sub interface.
- mpid - Specifies the destination MP ID. The value ranges between 1 and 8191.
- mac-address - Specifies the destination MAC-address.
- source - Specifies the source MP ID or MAC-address.
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Step 5 |
aggregate {interval} value |
Configures this Y.1731 aggregation parameter:
interval - Specifies the number of intervals. The aggregation period in seconds ranges between 1 and 65535. |
Step 6 |
frame consecutive value |
Specifies the number of consecutive measurements to be used to determine availability or unavailability status. |
Step 7 |
frame consecutive loss-ratio value |
Specifies the number of frames over which to calculate frame-loss ratio. |
Step 8 |
owner value |
Specifies the operation owner. |
Step 9 |
exit |
Exits the Y.1731 submode and enters the global configuration mode. |
Step 10 |
exit |
Exits the global configuration mode. |
Step 11 |
ip sla n |
Enables the IP SLA configuration. |
Step 12 |
ethernet y1731 loss SLM [ burst ] domain domain {{ vlan | evc } value }{ mpid | mac - address } value cos value source { mpid | mac-address } value |
Configures single ended frame loss measurement on the sender.
- burst - Specifies the number of frames to be sent in the cycle.
- evc - Specifies the ethernet virtual circuit identifier.
- vlan - Specifies the VLAN.
- cos - Specifies the class of service. The value ranges between 0 and 7. The COS value 7 is for aggregated COS and is used when LMM is configured for routed port sub interface.
- mpid - Specifies the destination MP ID. The value ranges between 1 and 8191.
- mac-address - Specifies the destination MAC-address.
- source - Specifies the source MP ID or MAC-address.
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Step 13 |
frequency seconds |
Configures the frequency of the burst cycles in seconds. The range is 1 to 900. |
Step 14 |
aggregate {interval} burst-cycles value |
Configures these Y.1731 aggregation parameters:
- interval - Specifies the number of intervals. The aggregation period in seconds ranges between 1 and 65535.
- burst-cycles - Specifies number of burst-cycles.
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Step 15 |
frame consecutive value |
Specifies number of consecutive measurements to be used to determine availability or unavailability status. |
Step 16 |
ip sla reaction-configuration operation-number { react { unavailableDS | unavailableSD } { loss-ratioDS | loss-ratioSD }[ threshold-type { average [ number-of-measurements ] | consecutive [ occurrences ] | immediate }] [ threshold-value upper-threshold lower-threshold ] |
Configures proactive threshold monitoring for frame loss measurements. |
Step 17 |
ip sla schedule n { life | ageout | recurring | start-time } value start-time start time |
Schedules the single ended frame loss measurement on sender.
- Life - Specifies the length of time to execute in seconds.
- Ageout - Specifies the length of time to keep the entry when inactive.
- Recurring - Specifies automatic scheduling every day.
- Start-time - Specifies the time to start the entry. The options available are:
– after – hh:mm – hh:mm:ss – now – pending |
Configuration Example
This example displays the configuration of single ended frame loss measurement:
Switch# configure terminal
Switch(config-ip-sla)# ethernet y1731 loss SLM domain r3 vlan 10 mpid 3 cos 1 source mpid 1
Switch(config-sla-y1731-loss)# aggregate interval 35
Switch(config-sla-y1731-loss)# frame consecutive 4
Switch(config-sla-y1731-loss)# frame consecutive loss-ratio 7
Switch(config-sla-y1731-loss)# exit
Switch(config-ip-sla)# exit
Switch(config-ip-sla)# ethernet y1731 loss SLM burst domain r3 vlan 10 mpid 3 cos 2 source mpid 1
Switch(config-sla-y1731-loss)# frequency 20
Switch(config-sla-y1731-loss)# aggregate interval burst-cycles 6
Switch(config-sla-y1731-loss)# frame consecutive 4
Switch(config-sla-y1731-loss)# exit
Switch(config-ip-sla)# exit
Switch(config-ip-sla)# exit
Switch(config-ip-sla)# ip sla reaction-configuration 1 react loss-ratioSD threshold-type immediate threshold-value 55 50
Switch(config-ip-sla)# ip sla reaction-configuration 2 react loss-ratioDS threshold-type immediate threshold-value 55 50
Switch(config-ip-sla)# exit
Switch(config)# ip sla schedule 1 life forever start-time now
Switch(config)# ip sla schedule 2 life forever start-time now
Switch(config)# exit
Configuring On-Demand Operations
Configuring a Direct On-Demand Operation
To configure a direct on-demand operation, complete these steps:
Note Before you begin, configure the command monitor loss counter [priority cos range] under the EVC CFM sub-config mode for those interfaces that require loss monitoring.
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Step 1 |
enable |
Enables privileged EXEC mode. Enter your password if prompted. |
Step 2 |
ip sla on-demand ethernet { DMMv1 | SLM } domain domain-name { evc evc-id | vlan vlan-id } { mpid target-mp-id | mac-address target-address } cos cos { source { mpid source-mp-id | mac-address source-address }} { continuous [ interval milliseconds ] | burst [ interval milliseconds ] [ number number-of-frames ] [ frequency seconds ]} [ size bytes ] aggregation seconds { duration seconds | max number-of-packets } |
Creates and runs an on-demand operation in direct mode.
- To create and run concurrent on-demand operations, configure this command using the DMMv1 keyword.
- Statistical output is posted on the console after the operation is finished.
- Repeat this step for each on-demand operation to be run.
- After and on-demand operation is finished, and the statistics handled, the operation is deleted.
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Configuring a Referenced On-Demand Operation
To configure a referenced on-demand operation, complete these steps:
Note Before you begin, configure the command monitor loss counter [priority cos range] under the EVC CFM sub-config mode for those interfaces that require loss monitoring.
Single-ended and concurrent Ethernet delay, or delay variation, and frame loss operations to be referenced must be configured. See Configuring Y.1731 Performance Monitoring
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Step 1 |
enable |
Enables privileged EXEC mode. Enter your password if prompted. |
Step 2 |
ip sla on-demand ethernet [ dmmv1 | slm ] operation number { duration seconds | max number-of-packets } |
Creates and runs a pseudo operation of the operation being referenced, in the background.
- Statistical output is posted on the console after the operation is finished.
- Repeat this step for each on-demand operation to be run.
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On-Demand Operation in Direct Mode
Switch# ip sla on-demand ethernet SLM domain xxx vlan 10 mpid 3 cos 1 source mpid 1 continuous aggregation 35 duration 38
Loss Statistics for Y1731 Operation 2984884426
Type of operation: Y1731 Loss Measurement
Latest operation start time: *20:17:41.535 PST Wed May 16 2012
Latest operation return code: OK
Start time: *20:17:41.535 PST Wed May 16 2012
End time: *20:18:16.535 PST Wed May 16 2012
Number of measurements initiated: 35
Number of measurements completed: 35
Unavailable indicators: 3
Min/Avg/Max - (FLR %): 0:9/000.00%/0:9
Cumulative - (FLR %): 000.00%
Min - *20:18:10.586 PST Wed May 16 2012
Max - *20:18:10.586 PST Wed May 16 2012
Unavailable indicators: 3
Min/Avg/Max - (FLR %): 0:9/000.00%/0:9
Cumulative - (FLR %): 000.00%
Min - *20:18:10.586 PST Wed May 16 2012
Max - *20:18:10.586 PST Wed May 16 2012
Loss Statistics for Y1731 Operation 2984884426
Type of operation: Y1731 Loss Measurement
Latest operation start time: *20:17:41.535 PST Wed May 16 2012
Latest operation return code: OK
Start time: *20:17:41.535 PST Wed May 16 2012
End time: *20:18:16.535 PST Wed May 16 2012
Number of measurements initiated: 35
Number of measurements completed: 35
Unavailable indicators: 3
Min/Avg/Max - (FLR %): 0:9/000.00%/0:9
Cumulative - (FLR %): 000.00%
Min - *20:18:10.586 PST Wed May 16 2012
Max - *20:18:10.586 PST Wed May 16 2012
Unavailable indicators: 3
Min/Avg/Max - (FLR %): 0:9/000.00%/0:9
Cumulative - (FLR %): 000.00%
Min - *20:18:10.586 PST Wed May 16 2012
Max - *20:18:10.586 PST Wed May 16 2012
On-Demand Operation in Referenced Mode
Device(config-term)# ip sla 11
Device(config-ip-sla)# ethernet y1731 loss SLM domain xxx vlan 10 mpid 3 cos 1 source mpid 1
Device(config-sla-y1731-loss)#end
Device# ip sla on-demand ethernet slm 11 duration 38
Loss Statistics for Y1731 Operation 2984884426
Type of operation: Y1731 Loss Measurement
Latest operation start time: *20:17:41.535 PST Wed May 16 2012
Latest operation return code: OK
Start time: *20:17:41.535 PST Wed May 16 2012
End time: *20:18:16.535 PST Wed May 16 2012
Number of measurements initiated: 35
Number of measurements completed: 35
Unavailable indicators: 3
Min/Avg/Max - (FLR %): 0:9/000.00%/0:9
Cumulative - (FLR %): 000.00%
Min - *20:18:10.586 PST Wed May 16 2012
Max - *20:18:10.586 PST Wed May 16 2012
Unavailable indicators: 3
Min/Avg/Max - (FLR %): 0:9/000.00%/0:9
Cumulative - (FLR %): 000.00%
Min - *20:18:10.586 PST Wed May 16 2012
Max - *20:18:10.586 PST Wed May 16 2012
Loss Statistics for Y1731 Operation 2984884426
Type of operation: Y1731 Loss Measurement
Latest operation start time: *20:17:41.535 PST Wed May 16 2012
Latest operation return code: OK
Start time: *20:17:41.535 PST Wed May 16 2012
End time: *20:18:16.535 PST Wed May 16 2012
Number of measurements initiated: 35
Number of measurements completed: 35
Unavailable indicators: 3
Min/Avg/Max - (FLR %): 0:9/000.00%/0:9
Cumulative - (FLR %): 000.00%
Min - *20:18:10.586 PST Wed May 16 2012
Max - *20:18:10.586 PST Wed May 16 2012
Unavailable indicators: 3
Min/Avg/Max - (FLR %): 0:9/000.00%/0:9
Cumulative - (FLR %): 000.00%
Min - *20:18:10.586 PST Wed May 16 2012
Max - *20:18:10.586 PST Wed May 16 2012
Verifying the Frame Delay and Synthetic Loss Measurement Configurations
- To verify configuration of SLM use this command in privileged EXEC mode:
Switch# show run | b ip sla
ethernet y1731 loss SLM domain PROVIDER_DOMAIN_VLAN evc domain_vlan101@101 mpid 101 cos 2 source mpid 102
ethernet y1731 loss SLM burst domain PROVIDER_DOMAIN_VLAN evc domain_vlan101@101 mpid 101 cos 2 source mpid 102
availability algorithm static-window
ip sla schedule 103 start-time now
ip sla enable reaction-alerts
Switch# show ip sla configuration
IP SLAs Infrastructure Engine-III
Operation timeout (milliseconds): 0
Ethernet Y1731 Loss Operation
Domain: PROVIDER_DOMAIN_VLAN
Request size (Padding portion): 64
Operation frequency (seconds): 20 (not considered if randomly scheduled)
Next Scheduled Start Time: Pending trigger
Randomly Scheduled : FALSE
Entry Ageout (seconds): never
Recurring (Starting Everyday): FALSE
Status of entry (SNMP RowStatus): Active
Threshold (milliseconds): 0
Frame consecutive loss-ratio: 10
Availability algorithm: sliding-window
Operation timeout (milliseconds): 0
Ethernet Y1731 Loss Operation
Domain: PROVIDER_DOMAIN_VLAN
Request size (Padding portion): 64
Operation frequency (seconds): 20 (not considered if randomly scheduled)
Next Scheduled Start Time: Start Time already passed
Randomly Scheduled : FALSE
Entry Ageout (seconds): never
Recurring (Starting Everyday): FALSE
Status of entry (SNMP RowStatus): Active
Threshold (milliseconds): 0
Aggregate interval burst-cycles: 1
Frame consecutive loss-ratio: 10
Availability algorithm: static-window
- To verify and monitor the frame delay and frame delay variation measurement configuration, use this command in privileged EXEC mode:
Switch# show ip sla statistics n
Delay Statistics for Operation n
Type of operation: Y1731 Delay Measurement
Latest operation start time: *21:37:08.895 PST Thu Aug 20 2009
Latest operation return code:
Number of measurements initiated: <x>
Number of measurements completed: <x>
Max/Avg/Min forward: x/y/z -> Min is only shown if clocks are in sync
Max/Avg/Min backward: x/y/z -> Only for two-way
Max/Avg/Min: x/y/z -> Only for two-way
Timestamps forward: Max - 21:37:08.895 PST Thu Aug 20 2009/Min - 21:37:08.995 PST Thu Aug 20 2009
Timestamps backward: Max - xxx/Min - yyy
Timestamps: Max - xxx/Min - yyy
Max/Avg/Min forward: x/y/z -> Min is only shown if clocks are in sync
Max/Avg/Min backward: x/y/z -> Only for two-way
Max/Avg/Min: x/y/z -> Only for two-way
Operation time to live: Forever
- To display all details of frame delay and frame delay variation measurements, use the show ip sla statistics detail command.
Switch# show ip sla statistics detail
IPSLAs Latest Operation Statistics
Delay Statistics for Y1731 Operation 3
Type of operation: Y1731 Delay Measurement
Latest operation start time: *00:00:00.000 PST Mon Jan 1 1900
Latest operation return code: OK
Start time: *00:00:00.000 PST Mon Jan 1 1900
Elapsed/End time: *00:00:00.000 PST Mon Jan 1 1900
Number of measurements initiated: 0
Number of measurements completed: 0
Max/Avg/Min TwoWay: 140116936/140116944/140116952
Timestamps TwoWay: Max - *00:00:00.000 PST Mon Jan 1 1900/Min - *00:00:00.000 PST Mon Jan 1 1900
Bucket Range: 0-4999 microsecond
Bucket Range: 5000-9999 microsecond
Bucket Range: 10000-14999 microsecond
Bucket Range: 15000-19999 microsecond
Bucket Range: 20000-24999 microsecond
Bucket Range: 25000-29999 microsecond
Bucket Range: 30000-34999 microsecond
Bucket Range: 35000-39999 microsecond
Bucket Range: 40000-44999 microsecond
Bucket Range: 45000--2 microsecond
Bucket Range: 0-4999 microsecond
Bucket Range: 5000-9999 microsecond
Bucket Range: 10000-14999 microsecond
Bucket Range: 15000-19999 microsecond
Bucket Range: 20000-24999 microsecond
Bucket Range: 25000-29999 microsecond
Bucket Range: 30000-34999 microsecond
Bucket Range: 35000-39999 microsecond
Bucket Range: 40000-44999 microsecond
Bucket Range: 45000--2 microsecond
Bucket Range: 0-0 microsecond
Bucket Range: 1-1 microsecond
Bucket Range: 2-2 microsecond
Bucket Range: 3-3 microsecond
Bucket Range: 4--2 microsecond
Max/Avg backward positive: 140116936/140116944
Timestamp backward positive: Max - *00:00:00.000 PST Mon Jan 1 1900
Max/Avg backward negative: 140116936/140116944
Timestamp backward negative: Max - *00:00:00.000 PST Mon Jan 1 1900
Max/Avg TwoWay positive: 140116936/140116944
Timestamp TwoWay positive: Max - *00:00:00.000 PST Mon Jan 1 1900
Max/Avg TwoWay negative: 140116936/140116944
Timestamp TwoWay negative: Max - *00:00:00.000 PST Mon Jan 1 1900
Bucket Range: 0-4999 microsecond
Bucket Range: 5000-9999 microsecond
Bucket Range: 10000-14999 microsecond
Bucket Range: 15000-19999 microsecond
Bucket Range: 20000-24999 microsecond
Bucket Range: 25000-29999 microsecond
Bucket Range: 30000-34999 microsecond
Bucket Range: 35000-39999 microsecond
Bucket Range: 40000-44999 microsecond
Bucket Range: 45000--2 microsecond
Bucket Range: 0-4999 microsecond
Bucket Range: 5000-9999 microsecond
Bucket Range: 10000-14999 microsecond
Bucket Range: 15000-19999 microsecond
Bucket Range: 20000-24999 microsecond
Bucket Range: 25000-29999 microsecond
Bucket Range: 30000-34999 microsecond
Bucket Range: 35000-39999 microsecond
Bucket Range: 40000-44999 microsecond
Bucket Range: 45000--2 microsecond
Bucket backward positive:
Bucket Range: 0-4999 microsecond
Bucket Range: 5000-9999 microsecond
Bucket Range: 10000-14999 microsecond
Bucket Range: 15000-19999 microsecond
Bucket Range: 20000-24999 microsecond
Bucket Range: 25000-29999 microsecond
Bucket Range: 30000-34999 microsecond
Bucket Range: 35000-39999 microsecond
Bucket Range: 40000-44999 microsecond
Bucket Range: 45000--2 microsecond
Bucket backward negative:
Bucket Range: 0-4999 microsecond
Bucket Range: 5000-9999 microsecond
Bucket Range: 10000-14999 microsecond
Bucket Range: 15000-19999 microsecond
Bucket Range: 20000-24999 microsecond
Bucket Range: 25000-29999 microsecond
Bucket Range: 30000-34999 microsecond
Bucket Range: 35000-39999 microsecond
Bucket Range: 40000-44999 microsecond
Bucket Range: 45000--2 microsecond
Bucket Range: 0-4999 microsecond
Bucket Range: 5000-9999 microsecond
Bucket Range: 10000-14999 microsecond
Bucket Range: 15000-19999 microsecond
Bucket Range: 20000-24999 microsecond
Bucket Range: 25000-29999 microsecond
Bucket Range: 30000-34999 microsecond
Bucket Range: 35000-39999 microsecond
Bucket Range: 40000-44999 microsecond
Bucket Range: 45000--2 microsecond
- To display all details of one-way Delay Message (1DM) measurements, use the show ip sla statistics detail command.
Switch# show ip sla statistics detail
IPSLAs Latest Operation Statistics
Delay Statistics for Y1731 Operation 20
Type of operation: Y1731 Delay Measurement
Latest operation start time: 19:07:00.007 IST Wed Jun 5 2013
Latest operation return code: OK
Start time: 19:07:00.007 IST Wed Jun 5 2013
End time: 19:07:30.007 IST Wed Jun 5 2013
Number of measurements initiated: 0
Number of measurements completed: 31
Number of forward observations: 31
Min/Avg/Max forward: 2000/2000/2000 (microsec)
Time of occurrence forward:
Min - 19:07:28.579 IST Wed Jun 5 2013
Max - 19:07:08.579 IST Wed Jun 5 2013
Bin Range (microsec) Total observations
Number of forward positive observations: 19
Min/Avg/Max forward positive: 0/0/0 (microsec)
Time of occurrence forward positive:
Min - 19:07:03.579 IST Wed Jun 5 2013
Max - 19:07:30.007 IST Wed Jun 5 2013
Number of forward negative observations: 11
Min/Avg/Max forward negative: 0/0/0 (microsec)
Time of occurrence forward negative:
Min - 19:07:18.579 IST Wed Jun 5 2013
Max - 19:07:28.579 IST Wed Jun 5 2013
Bin Range (microsec) Total observations
Bin Range (microsec) Total observations
- To display the same output as the latest statistics detail command, use the show ip sla history interval n command. The number displayed is the number of intervals configured.
Output for Loss Measurement:
Switch# show ip sla history 1 interval-statistics
Loss Statistics for Y1731 Operation 1
Type of operation: Y1731 Loss Measurement
Latest operation start time: *09:46:16.225 UTC Fri Nov 26 2010
Latest operation return code: OK
Start time: *09:46:16.225 UTC Fri Nov 26 2010
End time: *09:48:16.221 UTC Fri Nov 26 2010
Number of measurements initiated: 12006
Number of measurements completed: 12000
Number of Observations 11999
Max - *09:47:20.252 UTC Fri Nov 26 2010/ Min - *09:48:16.221 UTC Fri Nov 26 2010
Available indicators: 11999
Unavailable indicators: 0
Max/Avg/Min - (FLR %): 1:3/2.78%/0:0
Number of Observations 11999
Max - *09:48:16.221 UTC Fri Nov 26 2010/ Min - *09:48:16.221 UTC Fri Nov 26 2010
Available indicators: 11999
Unavailable indicators: 0
Max/Avg/Min - (FLR %): 0:0/0.0%/0:0
Output for Delay Measurement:
Switch#show ip sla history 10 interval-statistics
Delay Statistics for Y1731 Operation 10
Type of operation: Y1731 Delay Measurement
Latest operation start time: 10:58:30.144 PDT Tue Jan 4 2011
Latest operation return code: Timeout
Start time: 10:58:30.144 PDT Tue Jan 4 2011
End time: 10:59:05.140 PDT Tue Jan 4 2011
Number of measurements initiated: 33
Number of measurements completed: 34
Number of TwoWay observations: 34
Max/Avg/Min TwoWay: 113364/100499/100099 (microsec)
Time of occurrence TwoWay:
Max - 10:59:05.140 PDT Tue Jan 4 2011
Min - 10:58:40.076 PDT Tue Jan 4 2011
Bin Range (microsec) Total observations
Number of TwoWay positive observations: 19
Max/Avg TwoWay positive: 13256/706 (microsec)
Time of occurrence TwoWay positive:
Max - 10:59:05.140 PDT Tue Jan 4 2011
Number of TwoWay negative observations: 14
Max/Avg TwoWay negative: 86/11 (microsec)
Time of occurrence TwoWay negative:
Max - 10:58:40.076 PDT Tue Jan 4 2011
Bin Range (microsec) Total observations
Bin Range (microsec) Total observations
- To display the performance monitoring session summary, use the show ethernet cfm pm session summary command.
Switch# show ethernet cfm pm session summary
Number of Configured Session : 1
Number of Active Session: 1
Number of Inactive Session: 0
Troubleshooting Tips
These troubleshooting scenarios apply to the Y.1731 performance monitoring configurations:
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When the IP SLA sessions do not come up. |
Use these debug commands:
- debug ethernet cfm pm events [ session <session id> ]
- debug ethernet cfm pm error [ session <session id> ]
- debug ethernet cfm pm diagnostic
- debug ethernet cfm pm ipc [ session <session id> ]
- debug ethernet cfm pm packet [ session <session id> ]
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