Configuring Single-ended SLM in EVPN Networking

To perform packet loss performance measurement on a point-to-multipoint or multipoint-to-multipoint links, deploy single-ended synthetic loss measurement (SLM) to monitor the link quality.

Context

In EVPN networking, single-ended SLM includes on-demand and proactive SLM functions. On-demand single-ended SLM collects single-ended frame loss statistics at one or more specific times for diagnosis. Proactive single-ended SLM collects single-ended frame loss statistics periodically.

To collect performance statistics about frame loss on the network or AC side at a time or periodically, configure on-demand single-ended SLM through the EVPN.
To continuously collect performance statistics about frame loss on the AC side, configure proactive single-ended SLM through the EVPN.

Service packets are prioritized based on 802.1p priorities and are transmitted using different policies. Traffic from PE1 to PE3 shown in Figure 1 carries 802.1p priority values of 1 and 2. When single-ended SLM is performed for the link between PE1 and PE3, SLM frames with different priorities can be sent to determine the impact of a physical link on loss of packets with different priority values. The network administrator then can adjust QoS policies on the path. To collect accurate performance statistics, configure 802.1p priority-based single-ended SLM for the EVPN.

Figure 1 Networking of single-ended SLM

Procedure

Configure on-demand single-ended SLM.
Configure on-demand single-ended SLM on the AC side.
1. Perform the following steps on the devices at both ends of an AC where on-demand single-ended SLM will be implemented:
  1. Run system-view
    
    The system view is displayed.
  2. Run cfm mdmd-name
    
    The MD view is displayed.
  3. Run mama-name
    
    The MA view is displayed.
  4. Perform the following steps on the devices where the MEPs reside:
    - On the CE, run mapvlanvlan-id
      
      The MA is bound to a VLAN.
    - On the PE, run mapevpnvpn-instanceevpn-instance-name
      
      The MA is bound to an EVPN instance.
  5. Run mep mep-id mep-id interface interface-type interface-number inward
    
    A MEP is configured.
  6. Run remote-mep mep-idmep-id
    
    An RMEP is configured.
  7. (Optional) Run mep ccm-send [ mep-id mep-id ] enable
    
    The CCM transmission function is enabled.
  8. (Optional) Run remote-mep ccm-receive [ mep-idmep-id ] enable
    
    The CCM reception function is enabled.
  9. Run test-id test-id [ testid-file ]mep mep-id [ description description ]
    
    The test instance is configured on the device.
2. Perform the following configuration on the RMEP that receives SLM frames on the AC side:
  
  Run loss-measure single-ended-synthetic receivetest-idtest-id [ time-outtimeout-value ]
  
  The RMEP is enabled to receive SLM frames.
3. Perform the following configuration on the MEP that sends SLM frames to initiate on-demand single-ended SLM on the AC side:
  
  Run loss-measure single-ended-synthetic sendtest-id test-id interval { 100 | 1000 } [ sending-count count-value ] [ time-out time-out-value ]
  
  On-demand single-ended SLM is configured for an AC.
4. Run commit
  
  The configuration is committed.
Configure proactive single-ended SLM on the AC side.
1. Perform the following steps on the devices at both ends of an AC where proactive single-ended SLM will be implemented:
  1. Run system-view
    The system view is displayed.
  2. (Optional) Run y1731 pm-mode enable
    
    PM is enabled to manage Y.1731 proactive performance statistics.
  3. Run cfm mdmd-name
    
    The MD view is displayed.
  4. Run mama-name
    
    The MA view is displayed.
  5. Run mapevpnvpn-instanceevpn-instance-name
    
    The MA is bound to an EVPN instance.
  6. Run mep mep-id mep-id interface interface-type interface-number inward
    
    An interface-based MEP is configured.
  7. Run remote-mep mep-idmep-id
    
    An RMEP is configured.
  8. (Optional) Run mep ccm-send [ mep-id mep-id ] enable
    
    The CCM transmission function is enabled.
    
    This command can be configured only on an interface-based MEP.
  9. (Optional) Run remote-mep ccm-receive [ mep-idmep-id ] enable
    
    The CCM reception function is enabled.
  10. Run test-id test-id [ testid-file ]mep mep-id [ description description ]
    
    The test instance is configured on the device.
  11. (Optional) Run loss-measure single-ended-synthetic local-ratio-threshold test-id test-id-value upper-limit upper-limit lower-limit lower-limit
    Upper and lower thresholds are set for the near-end frame loss rate in proactive single-ended frame loss measurement based on a specified test instance.
  12. (Optional) Run loss-measure single-ended-synthetic remote-ratio-threshold test-id test-id-value upper-limit upper-limit lower-limit lower-limit
    Upper and lower thresholds are set for the far-end frame loss rate in proactive single-ended frame loss measurement based on a specified test instance.
2. Perform the following configuration on the RMEP that receives SLM frames on the AC side:
  
  Run loss-measure single-ended-synthetic receivetest-idtest-id [ time-outtimeout-value ]
  
  The RMEP is enabled to receive SLM frames.
3. Perform the following configuration on the MEP that sends SLM frames to initiate proactive single-ended SLM on the AC side:
  
  Run loss-measure single-ended-synthetic continual sendtest-id test-id interval { 1000 | 10000 } [ sending-count count-value ] [ time-out timeout ] [ period period ]
  
  Proactive single-ended SLM is enabled on the network or AC side.
4. Run commit
  
  The configuration is committed.

Verifying the Configuration

After configuring single-ended SLM, run the display y1731 statistic-type single-synthetic-loss test-id test-id [ count count ] command on the MEP that has been enabled to send SLM frames.