Brocade Multi-Service IronWare Administration Guide (Supporting R05.6.00) - Manual (Page 173)

Multi-Service IronWare Administration Guide 155
53-1003028-02
Y.1731 performance management
6
Frame Delay = (RxTimeb – TxTimeStampf) – (TxTimeStampb – RxTimeStampf)
This release provides Y.1731 support for the following:
• VLANs
• VPLS
• Both VC-mode tagged and raw
• VLL
• Both tagged and raw modes
• Up and Down MEPs for VLANs, VPLS, and VLL
• Over LAG ports
• The active primary port of the trunk would be used to transmit ETH-DM frames in case of
down MEP
• Through 802.1ag MIPs
• MIP would behave as a transient node for ETH-DM frames
Configuration considerations:
When using Y.1731, consider the following:
• ETH-DM is reliable only if the transmitted DM frame (DMM) and received DM reply (DMR) are
on the same line processor (LP). In the event that they are different, results will not be
accurate.
• Maximum frame-delay that can be measured is 4 seconds. If a DMR packet is received with a
delay greater than 4 seconds, the packet is discarded and ignored.
• ETH-DM does not gather path data. To determine which path the DM applies to, use the cfm
linktrace domain command, since ETH-DM frames follow the same path.
• One-way ETH-DM is not supported in this release of the Multi-Service IronWare.
Configuring Y.1731 performance monitoring
Use the cfm delay_measurement domain command to issue the delay measurement. If the
number of delay measurement frame is greater than 16, then the last 16 delay measurement
replies are printed.
You can issue the cfm delay measurement command from different sessions if they are for
different src-meps. However, if it is for same src-mep, it only completes one session at a time.
Brocade# cfm delay_measurement domain md2 ma ma2 src-mep 3 target-mep 2
Y1731: Sending 10 delay_measurement to 0000.00f7.3931, timeout 1000 msec
Type Control-c to abort
Reply from 0000.00f7.3931: time= 32.131 us
Reply from 0000.00f7.3931: time= 31.637 us
Reply from 0000.00f7.3931: time= 32.566 us
Reply from 0000.00f7.3931: time= 34.052 us
Reply from 0000.00f7.3931: time= 33.376 us
Reply from 0000.00f7.3931: time= 31.501 us
Reply from 0000.00f7.3931: time= 33.016 us
Reply from 0000.00f7.3931: time= 32.537 us
Reply from 0000.00f7.3931: time= 32.492 us
Reply from 0000.00f7.3931: time= 32.552 us
sent = 10 number = 10 A total of 10 delay measurement replies received.
Success rate is 100 percent (10/10)