| Description | The Maintenance Association End Point (MEP) table.
Each row in the table represents a different MEP. A MEP is
an actively managed CFM entity, associated with a specific
DSAP of a Service Instance, which can generate and receive
CFM PDUs and track any responses. It is an end point of a
single Maintenance Association, and is an endpoint of a
separate Maintenance Entity for each of the other MEPs in
the same Maintenance Association (802.1ag clause 3.18).
This table uses three indices. The first two indices are the
indices of the Maintenance Domain and MA tables, the reason
being that a MEP is always related to an MA and Maintenance
Domain.
The Transmit Loopback table. Entries in this table are
created/removed at the same time than entries in the MEP
table are created/removed.
The MEP table also stores all the managed objects for sending
LBM and LTM.
*LBM Managed objects
LBM Managed objects in the MEP table
enables the management entity to initiate
transmission of Loopback messages. It will signal the MEP
that it should transmit some number of Loopback messages
and detect the detection (or lack thereof) of the
corresponding Loopback messages.
Steps to use entries in this table:
1) Wait for cdot1agMepTransmitLbmStatus value to be
'ready'. To do this do this sequence:
a. an SNMP GET for both SnmpSetSerialNo and
cdot1agMepTransmitLbmStatus objects (in same SNMP
PDU).
b. Check if value for cdot1agMepTransmitLbmStatus is
'ready'
- if not, wait x seconds, go to step a above.
- if yes, save the value of SnmpSetSerialNo and go
to step 2) below
2) Change cdot1agMepTransmitLbmStatus value from 'ready' to
'notReady' to ensure no other management entity will use
the service. In order to not disturb a possible other NMS
do this by sending an SNMP SET for both SnmpSetSerialNo
and cdot1agMepTransmitLbmStatus objects (in same SNMP
PDU, and make sure SNmpSetSerialNo is the first varBind).
For the SnmpSetSerialNo varBind, use the value that you
obtained in step 1)a.. This ensures that two cooperating
NMSes will not step on each others toes.
3) Setup the different data to be sent (number of messages,
optional TLVs,...).
4) Record the current values of cdot1agMepLbrIn,
cdot1agMepLbrInOutOfOrder, and cdot1agMepLbrBadMsdu.
6) Change cdot1agMepTransmitLbmStatus value from 'notReady'
to 'transmit' to initiate transmission of Loopback
messages.
7) Check the value of cdot1agMepTransmitLbmResultOK to
find out if the operation was successfully initiated or
not.
8) Monitor the value of cdot1agMepTransmitLbmMessages.
When it reaches 0, the last LBM has been transmitted.
Wait an additional 5 seconds to ensure that all LBRs have
been returned.
9) Compare cdot1agMepLbrIn, cdot1agMepLbrInOutOfOrder,
and cdot1agMepLbrBadMsdu to their old values from step
4, above, to get the results of the test.
10) Change the cdot1agMepTransmitLbmStatus value back to
'ready' to allow other management entities to use the
table.
*LTM Managed objects
The LTM Managed objects in the MEP table are used in a manner
similar to that described for LBM transmission, above. Upon
successfully initiating the transmission, the variables
cdot1agMepTransmitLtmSeqNumber and
cdot1agMepTransmitLtmEgressIdentifier return the information
required to recover the results of the LTM from the
cdot1agLtrTable. |