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Ethernet Frame Delay Measurement Examples

This section includes the following examples:

Two-Way Delay Measurement with Single Tagged Interface

This example uses two MX routers: MX-1 and MX-2. The configuration creates a CFM down MEP session on a VLAN-tagged logical interface connecting the two (ge-5/2/9 on Router MX-1 and ge-0/2/5 on Router MX-2).

Note: These are not complete router configurations.

Configuration on Router MX-1:

interfaces {
ge-5/2/9 {
vlan-tagging;
unit 0 {
vlan-id 512;
}
}
}
protocols {
oam {
ethernet {
connectivity-fault-management {
traceoptions {
file eoam_cfm.log size 1g files 2 world-readable;
flag all;
}
linktrace {
path-database-size 255;
age 10s;
}
maintenance-domain md6 {
level 6;
maintenance-association ma6 {
continuity-check {
interval 100ms;
hold-interval 1;
}
mep 201 {
interface ge-5/2/9.0;
direction down;
auto-discovery;
}
}
}
}
}
}
}

Configuration on Router MX-2:

[edit]
interfaces {
ge-0/2/5 {
vlan-tagging;
unit 0 {
vlan-id 512;
}
}
}
protocols {
oam {
ethernet {
connectivity-fault-management {
traceoptions {
file eoam_cfm.log size 1g files 2 world-readable;
flag all;
}
linktrace {
path-database-size 255;
age 10s;
}
maintenance-domain md6 {
level 6;
maintenance-association ma6 {
continuity-check {
interval 100ms;
hold-interval 1;
}
mep 101 {
interface ge-0/2/5.0;
direction down;
auto-discovery;
}
}
}
}
}
}
}

From Router MX-1, start a two-way delay measurement to Router MX-2.


user@MX-1> monitor ethernet delay-measurement two-way mep 101 maintenance-domain md6 maintenance-association ma6 count 10
Two-way ETH-DM request to 00:90:69:0a:48:57, Interface ge-5/2/9.0
DMR received from 00:90:69:0a:48:57 Delay: 100 usec Delay variation: 0 usec
DMR received from 00:90:69:0a:48:57 Delay: 92 usec Delay variation: 8 usec
DMR received from 00:90:69:0a:48:57 Delay: 92 usec Delay variation: 0 usec
DMR received from 00:90:69:0a:48:57 Delay: 111 usec Delay variation: 19 usec
DMR received from 00:90:69:0a:48:57 Delay: 110 usec Delay variation: 1 usec
DMR received from 00:90:69:0a:48:57 Delay: 119 usec Delay variation: 9 usec
DMR received from 00:90:69:0a:48:57 Delay: 122 usec Delay variation: 3 usec
DMR received from 00:90:69:0a:48:57 Delay: 92 usec Delay variation: 30 usec
DMR received from 00:90:69:0a:48:57 Delay: 92 usec Delay variation: 0 usec
DMR received from 00:90:69:0a:48:57 Delay: 108 usec Delay variation: 16 usec

--- Delay measurement statistics ---
Packets transmitted: 10, Valid packets received: 10
Average delay: 103 usec, Average delay variation: 8 usec
Best case delay: 92 usec, Worst case delay: 122 usec

The counters are displayed as part of the MEP database on Router MX-1 maintenance domain MD6.


user@MX-1> show oam ethernet connectivity-fault-management mep-database maintenance-domain md6
Maintenance domain name: md6, Format: string, Level: 6
  Maintenance association name: ma6, Format: string
  Continuity-check status: enabled, Interval: 100ms, Loss-threshold: 3 frames
  MEP identifier: 201, Direction: down, MAC address: 00:90:69:0a:43:94
  Auto-discovery: enabled, Priority: 0
  Interface name: ge-5/2/9.0, Interface status: Active, Link status: Up
  Defects:
    Remote MEP not receiving CCM                  : no
    Erroneous CCM received                        : no
    Cross-connect CCM received                    : no
    RDI sent by some MEP                          : no
  Statistics:
    CCMs sent                                     : 894
    CCMs received out of sequence                 : 0
    LBMs sent                                     : 0
    Valid in-order LBRs received                  : 0
    Valid out-of-order LBRs received              : 0
    LBRs received with corrupted data             : 0
    LBRs sent                                     : 0
    LTMs sent                                     : 0
    LTMs received                                 : 0
    LTRs sent                                     : 0
    LTRs received                                 : 0
    Sequence number of next LTM request           : 0
    1DMs sent                                     : 0
    Valid 1DMs received                           : 0
    Invalid 1DMs received                         : 0
    DMMs sent                                     : 10
    DMRs sent                                     : 0
    Valid DMRs received                           : 10
    Invalid DMRs received                         : 0
  Remote MEP count: 1
    Identifier    MAC address        State    Interface
      101     00:90:69:0a:48:57       ok    ge-5/2/9.0

The collected MEP statistics are saved (up to 100 per remote MEP or per CFM session) and displayed as part of the MEP statistics on Router MX-1.


user@MX-1> show oam ethernet connectivity-fault-management mep-statistics maintenance-domain md6
MEP identifier: 201, MAC address: 00:90:69:0a:43:94
Remote MEP count: 1
  CCMs sent                                     : 3154
  CCMs received out of sequence                 : 0
  LBMs sent                                     : 0
  Valid in-order LBRs received                  : 0
  Valid out-of-order LBRs received              : 0
  LBRs received with corrupted data             : 0
  LBRs sent                                     : 0
  LTMs sent                                     : 0
  LTMs received                                 : 0
  LTRs sent                                     : 0
  LTRs received                                 : 0
  Sequence number of next LTM request           : 0
  1DMs sent                                     : 0
  Valid 1DMs received                           : 0
  Invalid 1DMs received                         : 0
  DMMs sent                                     : 10
  DMRs sent                                     : 0
  Valid DMRs received                           : 10
  Invalid DMRs received                         : 0
 
  Remote MEP identifier: 101
  Remote MAC address: 00:90:69:0a:48:57
    Delay measurement statistics:
    Index  One-way delay  Two-way delay
              (usec)         (usec)    
      1                       100           
      2                       92            
      3                       92            
      4                       111           
      5                       110           
      6                       119           
      7                       122           
      8                       92            
      9                       92            
      10                      108           
    Average two-way delay          : 103 usec
    Average two-way delay variation: 8 usec
    Best case two-way delay        : 92 usec
    Worst case two-way delay       : 122 usec

The collected delay statistics are also saved (up to 100 per session) and displayed as part of the MEP delay statistics on Router MX-1.


user@MX-1> show oam ethernet connectivity-fault-management delay-statistics maintenance-domain md6
MEP identifier: 201, MAC address: 00:90:69:0a:43:94
Remote MEP count: 1

  Remote MAC address: 00:90:69:0a:48:57
    Delay measurement statistics:
    Index  One-way delay  Two-way delay
                           (usec)         (usec)    
      1                       100           
      2                       92            
      3                       92            
      4                       111           
      5                       110           
      6                       119           
      7                       122           
      8                       92            
      9                       92            
      10                      108           
    Average two-way delay          : 103 usec
    Average two-way delay variation: 8 usec
    Best case two-way delay        : 92 usec
    Worst case two-way delay       : 122 usec

One-Way Delay Measurement with Single Tagged Interface

This example uses two MX routers: MX-1 and MX-2. The configuration creates a CFM down MEP session on a VLAN-tagged logical interface connecting the two (ge-5/2/9 on Router MX-1 and ge-0/2/5 on Router MX-2).

Note: These are not complete router configurations.

Configuration on Router MX-1:

interfaces {
ge-5/2/9 {
vlan-tagging;
unit 0 {
vlan-id 512;
}
}
}
protocols {
oam {
ethernet {
connectivity-fault-management {
traceoptions {
file eoam_cfm.log size 1g files 2 world-readable;
flag all;
}
linktrace {
path-database-size 255;
age 10s;
}
maintenance-domain md6 {
level 6;
maintenance-association ma6 {
continuity-check {
interval 100ms;
hold-interval 1;
}
mep 201 {
interface ge-5/2/9.0;
direction down;
auto-discovery;
}
}
}
}
}
}
}

Configuration on Router MX-2:

[edit]
interfaces {
ge-0/2/5 {
vlan-tagging;
unit 0 {
vlan-id 512;
}
}
}
protocols {
oam {
ethernet {
connectivity-fault-management {
traceoptions {
file eoam_cfm.log size 1g files 2 world-readable;
flag all;
}
linktrace {
path-database-size 255;
age 10s;
}
maintenance-domain md6 {
level 6;
maintenance-association ma6 {
continuity-check {
interval 100ms;
hold-interval 1;
}
mep 101 {
interface ge-0/2/5.0;
direction down;
auto-discovery;
}
}
}
}
}
}
}

From Router MX-2, start a one-way delay measurement to Router MX-1.


user@MX-2> monitor ethernet delay-measurement one-way mep 201 maintenance-domain md6 maintenance-association ma6 count 10
One-way ETH-DM request to 00:90:69:0a:43:94, Interface ge-0/2/5.0
1DM Frames sent : 10
--- Delay measurement statistics ---
Packets transmitted: 10
Average delay: NA, Average delay variation: NA
Best case delay: NA, Worst case delay: NA

The counters are displayed as part of the local MEP database on Router MX-2.


user@MX-2> show oam ethernet connectivity-fault-management mep-database maintenance-domain md6 maintenance-domain ma6
Maintenance domain name: md6, Format: string, Level: 6
  Maintenance association name: ma6, Format: string
  Continuity-check status: enabled, Interval: 100ms, Loss-threshold: 3 frames
  MEP identifier: 101, Direction: down, MAC address: 00:90:69:0a:48:57
  Auto-discovery: enabled, Priority: 0
  Interface name: ge-0/2/5.0, Interface status: Active, Link status: Up
  Defects:
    Remote MEP not receiving CCM                  : no
    Erroneous CCM received                        : no
    Cross-connect CCM received                    : no
    RDI sent by some MEP                          : no
  Statistics:
    CCMs sent                                     : 1590
    CCMs received out of sequence                 : 0
    LBMs sent                                     : 0
    Valid in-order LBRs received                  : 0
    Valid out-of-order LBRs received              : 0
    LBRs received with corrupted data             : 0
    LBRs sent                                     : 0
    LTMs sent                                     : 0
    LTMs received                                 : 0
    LTRs sent                                     : 0
    LTRs received                                 : 0
    Sequence number of next LTM request           : 0
    1DMs sent                                     : 10
    Valid 1DMs received                           : 0
    Invalid 1DMs received                         : 0
    DMMs sent                                     : 0
    DMRs sent                                     : 0
    Valid DMRs received                           : 0
    Invalid DMRs received                         : 0
  Remote MEP count: 1
    Identifier    MAC address        State    Interface
      201     00:90:69:0a:43:94       ok    ge-0/2/5.0

The remote MEP database statistics are available on Router MX-1.


user@MX-1> show oam ethernet connectivity-fault-management mep-database maintenance-domain md6
Maintenance domain name: md6, Format: string, Level: 6
  Maintenance association name: ma6, Format: string
  Continuity-check status: enabled, Interval: 100ms, Loss-threshold: 3 frames
  MEP identifier: 201, Direction: down, MAC address: 00:90:69:0a:43:94
  Auto-discovery: enabled, Priority: 0
  Interface name: ge-5/2/9.0, Interface status: Active, Link status: Up
  Defects:
    Remote MEP not receiving CCM                  : no
    Erroneous CCM received                        : no
    Cross-connect CCM received                    : no
    RDI sent by some MEP                          : no
  Statistics:
    CCMs sent                                     : 1572
    CCMs received out of sequence                 : 0
    LBMs sent                                     : 0
    Valid in-order LBRs received                  : 0
    Valid out-of-order LBRs received              : 0
    LBRs received with corrupted data             : 0
    LBRs sent                                     : 0
    LTMs sent                                     : 0
    LTMs received                                 : 0
    LTRs sent                                     : 0
    LTRs received                                 : 0
    Sequence number of next LTM request           : 0
    1DMs sent                                     : 0
    Valid 1DMs received                           : 10
    Invalid 1DMs received                         : 0
    DMMs sent                                     : 0
    DMRs sent                                     : 0
    Valid DMRs received                           : 0
    Invalid DMRs received                         : 0
  Remote MEP count: 1
    Identifier    MAC address        State    Interface
      101     00:90:69:0a:48:57       ok    ge-5/2/9.0

The remote Router MX-1 should also collect the delay statistics (up to 100 per session) for display with mep-statistics or delay-statistics.


user@MX-1> show oam ethernet connectivity-fault-management mep-statistics maintenance-domain md6
MEP identifier: 201, MAC address: 00:90:69:0a:43:94
Remote MEP count: 1
  CCMs sent                                     : 3240
  CCMs received out of sequence                 : 0
  LBMs sent                                     : 0
  Valid in-order LBRs received                  : 0
  Valid out-of-order LBRs received              : 0
  LBRs received with corrupted data             : 0
  LBRs sent                                     : 0
  LTMs sent                                     : 0
  LTMs received                                 : 0
  LTRs sent                                     : 0
  LTRs received                                 : 0
  Sequence number of next LTM request           : 0
  1DMs sent                                     : 0
  Valid 1DMs received                           : 10
  Invalid 1DMs received                         : 0
  DMMs sent                                     : 0
  DMRs sent                                     : 0
  Valid DMRs received                           : 0
  Invalid DMRs received                         : 0

  Remote MEP identifier: 101
  Remote MAC address: 00:90:69:0a:48:57
    Delay measurement statistics:
    Index  One-way delay  Two-way delay
              (usec)         (usec)    
      1        370          
      2        357          
      3        344          
      4        332          
      5        319          
      6        306          
      7        294          
      8        281          
      9        269          
      10       255          
    Average one-way delay          : 312 usec
    Average one-way delay variation: 11 usec
    Best case one-way delay        : 255 usec
    Worst case one-way delay       : 370 usec

user@MX-1> show oam ethernet connectivity-fault-management delay-statistics maintenance-domain md6
MEP identifier: 201, MAC address: 00:90:69:0a:43:94
Remote MEP count: 1

  Remote MAC address: 00:90:69:0a:48:57
    Delay measurement statistics:
    Index  One-way delay  Two-way delay
              (usec)         (usec)    
      1        370          
      2        357          
      3        344          
      4        332          
      5        319          
      6        306          
      7        294          
      8        281          
      9        269          
      10       255          
    Average one-way delay          : 312 usec
    Average one-way delay variation: 11 usec
    Best case one-way delay        : 255 usec

Note: When two systems are close to each other, their one-way delay values are very high compared to their two-way delay values. This is because one-way delay measurement requires the timing for the two systems to be synchronized at a very granular level and MX-series platforms do not support this granular synchronization. However, two-way delay measurement does not require synchronized timing, making two-way delay measurements more accurate.

Delay Measurements with Untagged Interfaces

Ethernet frame delay measurements are supported on untagged interfaces. All commands are the same as for tagged interfaces. Only the configurations are different. This section shows the untagged interface configurations for Routers MX-1 and MX-2.

Note: These are not complete router configurations.

Untagged interface configuration for Router MX-1.

[edit]
interfaces {
ge-5/0/0 {
unit 0;
}
ge-5/2/9 {
unit 0;
}
}
protocols {
oam {
ethernet {
connectivity-fault-management {
traceoptions {
file eoam_cfm.log size 1g files 2 world-readable;
flag all;
}
linktrace {
path-database-size 255;
age 10s;
}
maintenance-domain md6 {
level 6;
maintenance-association ma6 {
continuity-check {
interval 100ms;
hold-interval 1;
}
mep 201 {
interface ge-5/0/0;
direction down;
auto-discovery;
}
}
}
}
}
}
}

Untagged interface configuration for Router MX-2.

[edit]
interfaces {
ge-0/2/2 {
unit 0;
}
ge-0/2/5 {
unit 0;
}
}
protocols {
oam {
ethernet {
connectivity-fault-management {
traceoptions {
file eoam_cfm.log size 1g files 2 world-readable;
flag all;
}
linktrace {
path-database-size 255;
age 10s;
}
maintenance-domain md6 {
level 6;
maintenance-association ma6 {
continuity-check {
interval 100ms;
hold-interval 1;
}
mep 101 {
interface ge-0/2/2;
direction down;
auto-discovery;
}
}
}
}
}
}
}
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