Technical Documentation

Example: Configuring Two-Way Ethernet Frame Delay Measurements with Single-Tagged Interfaces

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:

[edit]
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

Published: 2009-10-11