Brocade 6910 Ethernet Access Switch Configuration Guide (Supporting R2.2.0.0) - Manual (Page 620)

564 Brocade 6910 Ethernet Access Switch Configuration Guide
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CFM Commands
• Previous CCM frame's TxFCf, RxFCb and TxFCb values and local counter RxFC1 value at
the time the previous CCM frame was received. These values are represented as TxFCf[t
p
],
RxFCb[t
p
], TxFCb[t
p
] and RxFCl[t
p
], where t
p
is the reception time of the previous frame.
Frame loss far-end = |TxFCb[t
c
] – TxFCb[t
p
]| – |RxFCb[t
c
] – RxFCb[t
p
]|
Frame loss near-end = |TxFCf[t
c
] – TxFCf[t
p
]| – |RxFCl[t
c
] – RxFCl[t
p
]|
• Single-ended loss measurement (LM) is carried out by sending periodic loss measurement
request (LMM) PDUs to its peer MEP and receiveing loss measurement reply (LMR) PDUs from
its peer MEP to carry out loss measurements.
To perform loss measurement, a MEP periodically transmits LMM frames with the following
information element:
• TxFCf– Value of the local counter TxFC1 at the time of LMM frame transmission.
Whenever a valid LMM frame is received by a MEP, an LMR frame is generated and
transmitted to the requesting MEP. An LMR frame contains the following values:
• TxFCf – Value of TxFCf copied from the LMM frame.
• RxFCf – Value of local counter RxFC1 at the time of LMM frame reception.
• TxFCb – Value of local counter TxFC1 at the time of LMR frame transmission.
Upon receiving an LMR frame, a MEP uses the following values to make near-end and far-end
loss measurements:
• Received LMR frame's TxFCf, RxFCf and TxFCb values and local counter RxFC1 value at
the time this LMR frame was received. These values are represented as TxFCf[t
c
],
RxFCf[t
c
], TxFCb[t
c
] and RxFCl[t
c
], where t
c
is the reception time of the current reply frame.
• Previous LMR frame's TxFCf, RxFCf and TxFCb values and local counter RxFC1 value at the
time the previous LMR frame was received. These values are represented as TxFCf[t
p
],
RxFCf[t
p
], TxFCb[t
p
] and RxFCl[t
p
], where t
p
is the reception time of the previous reply
frame.
Frame loss far-end = |TxFCf[t
c
] – TxFCf[t
p
]| – |RxFCf[t
c
] – RxFCf[t
p
]|
Frame loss near-end = |TxFCb[t
c
] – TxFCb[t
p
]| – |RxFCl[t
c
] – RxFCl[t
p
]|
Example
This example enables periodic loss-measure message transmission for the specified MEP.
Console(config)#ethernet cfm loss-measure enable dual-ended md voip ma rd mpid 1
Console(config)#
ethernet cfm loss-measure single-ended binding
This command binds periodic loss-measure settings to a specified local MEP. Use the no form to
remove a binding.
Syntax
ethernet cfm loss-measure single-ended binding group group-index md domain-name
ma ma-name mpid mpid
no ethernet cfm delay-measure binding group md domain-name ma ma-name mpid mpid
group-index – Index for a group of loss-measure messages attributes. (Range: 1-200)
domain-name – Domain name. (Range: 1-43 alphanumeric characters)