Configuring DMM over VPLS

Delay Measurement Message (DMM) is part of the ITU-T Y.1731 standard. It can be used to periodically measure Frame Delay and Frame Delay Variation between a pair of point to point MEPs. Measurements are made between two MEPs belonging to the same domain and MA.

Restrictions for DMM support over VPLS

  • With SR_5_label_push template, IP SLA DMM is not supported on RSP3 module.

  • Only Up MEP(Maintenance End Point) on EVC(ethernet virtual circuit) BD(bridge domain) with VPLS towards the core is supported. Down MEP on VFI is not supported.

  • To send unicast packets (LBR, LTM/R, Y1731 packets), port-emulation method is used. The access interface (the interface where Up MEP is configured) needs to be up to send unicast packets.

Configuring DMM over VPLS

SUMMARY STEPS

  1. Configure CFM on PE Device.
  2. Configure CFM over VPLS using l2 vfi vfi-name manual evc command or l2vpn vfi context vfi-name command.
  3. Configure a Sender MEP.

DETAILED STEPS

  Command or Action Purpose
Step 1

Configure CFM on PE Device.

For configuration details see, Configuring Ethernet Connectivity Fault Management in a Service Provider Network .

In case of H-VPLS configuration, see, CFM Configuration over EFP Interface with Cross Connect Feature.

Step 2

Configure CFM over VPLS using l2 vfi vfi-name manual evc command or l2vpn vfi context vfi-name command.

The evc should be the EVC name used in the CFM on PE device configuration. For configuration details, see, Configuring the VFI in the PE.

Step 3

Configure a Sender MEP.

For configuration details see, Configuring a Sender MEP for a Single-Ended Ethernet Delay or Delay Variation Operation.

Configuration Example for DMM over VPLS

The following sample output shows the configuration of DMM over VPLS: 

ethernet evc EVC_100
ethernet cfm global
ethernet cfm domain CFM-VPLS level 5
service ser1 evc EVC_100 vlan 100
continuity-check
continuity-check interval 1s
l2 vfi VPLS-CFM manual EVC_100
vpn id 100
bridge-domain 100
neighbor 2.2.2.2 encapsulation mpls
interface GigabitEthernet0/4/4
service instance 100 ethernet EVC_100
encapsulation dot1q 100
cfm mep domain CFM-VPLS mpid 1001
bridge-domain 100
ip sla 200
ethernet y1731 delay DMM domain CFM-VPLS evc EVC_100 mpid 1002 cos 7 source mpid 1001
ip sla schedule 200 start-time now

The following sample output shows the configuration of DMM over VPLS using the l2vpn vfi context command: 

ethernet evc EVC_100
ethernet cfm global
ethernet cfm domain CFM-VPLS level 5
service ser1 evc EVC_100 vlan 100
continuity-check
continuity-check interval 1s
l2vpn vfi context VPLS-CFM
vpn id 100
evc EVC_100   
neighbor 2.2.2.2 encapsulation mpls
interface GigabitEthernet0/4/4
service instance 100 ethernet EVC_100
encapsulation dot1q 100
cfm mep domain CFM-VPLS mpid 1001
bridge-domain 100
member GigabitEthernet0/4/4 service-instance 100
member vfi VPLS-CFM
ip sla 200
ethernet y1731 delay DMM domain CFM-VPLS evc EVC_100 mpid 1002 cos 7 source mpid 1001
ip sla schedule 200 start-time now

Note

The EVC name is mandatory and should be the same as the one configured in CFM.

Configuration Verification Example for DMM over VPLS

The following sample output shows the configuration verification of DMM over VPLS: 

Router#sh ip sla configuration
IP SLAs Infrastructure Engine-III
Entry number: 200
Owner:
Tag:
Operation timeout (milliseconds): 5000
Ethernet Y1731 Delay Operation
Frame Type: DMM
Domain: CFM_VPLS
Evc: EVC_100
Target Mpid: 1002
Source Mpid: 1001
CoS: 7
   Max Delay: 5000
   Request size (Padding portion): 64
   Frame Interval: 1000
   Clock: Not In Sync
Threshold (milliseconds): 5000
Schedule:
   Operation frequency (seconds): 900  (not considered if randomly scheduled)
   Next Scheduled Start Time: Start Time already passed
   Group Scheduled : FALSE
   Randomly Scheduled : FALSE
   Life (seconds): 3600
   Entry Ageout (seconds): never
   Recurring (Starting Everyday): FALSE
   Status of entry (SNMP RowStatus): Active
Statistics Parameters
  Frame offset: 1
  Distribution Delay Two-Way:
   Number of Bins 10
   Bin Boundaries: 5000,10000,15000,20000,25000,30000,35000,40000,45000,-1
  Distribution Delay-Variation Two-Way:
   Number of Bins 10
   Bin Boundaries: 5000,10000,15000,20000,25000,30000,35000,40000,45000,-1
  Aggregation Period: 900
History
  Number of intervals: 2


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