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Example: Configuring One-Way Ethernet Frame Delay Measurements with Single-Tagged Interfaces
This example uses two MX Series 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-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 10One-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 ma6Maintenance 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-0/2/5.0The remote MEP database statistics are available on Router MX-1.
user@MX-1> show oam ethernet connectivity-fault-management
mep-database maintenance-domain md6Maintenance 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-5/2/9.0The 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 md6MEP 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 usecuser@MX-1> show oam ethernet connectivity-fault-management
delay-statistics maintenance-domain md6MEP 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 routers do not support this granular synchronization. However, two-way delay measurement does not require synchronized timing, making two-way delay measurements more accurate. |
