Falcon
M-Class
| User Guide
329
4.22.7.2
Link Trace
Link trace is used to discover and monitor the path between two MEPs
A MEP sends link trace frames (LTM) and when received by a MIP, the MIP responds to the
transmitting MEP and forwards the link trace frame. The receiving MEP will also send a
link trace reply (LTR), so the transmitting MEP is able to build a list of MAC addresses of the
MIPs and MEF reached. The Link Trace with MAC addresses will be displayed in the following
figure when the Link Trace operation is implemented.
Figure 4-190: Link Trace display
Table 4-169
:
Link Trace Parameters
Link Trace
Enable
Link Trace based on transmitting/receiving LTM/LTR PDU can be
enabled/disabled Link Trace is automatically disabled when all 5
transactions are done with 5 sec. interval - waiting 5 sec. for all LTR in the
end. The LTM PDU is always transmitted as Multi-cast Class 2.
Priority
The priority to be inserted as PCP bits in TAG (if any).
Peer MEP
This is only used if the 'Unicast MAC' is configured to all zero.
Link Trace Target MAC will be taken from the 'Unicast Peer MAC'
configuration of this peer.
Unicast MAC
This is only used if NOT configured to all zero. This will be used as the Link
Trace Target MAC. This is the only way to configure a MIP as Target MAC.
Time to Live
This is the LTM PDU TTL value as described in Y.1731. This value is
decremented each time forwarded by a MIP. Will not be forwarded
reaching zero.
Link Trace State
Transaction
ID
The transaction id is incremented for each LTM send. This value is inserted
the transmitted LTM PDU and is expected to be received in the LTR PDU.
Received LTR with wrong transaction id is ignored. There are five
transactions in one Link Trace activated.
Time To
Live
This is the TTL value taken from the LTM received by the MIP/MEP sending
this LTR - decremented as if forwarded.
Mode
Indicating if is was a MEP/MIP sending this LTR.
Direction
Indicating if MEP/MIP sending this LTR is ingress/egress.
Forwarded
Indicating if MEP/MIP sending this LTR has relayed/forwarded the LTM.
Relay
The Relay action can be one of the following:
MAC:
The was a hit on the LT Target MAC
FDB:
LTM is forwarded based on hit in the Filtering DB
MFDB:
LTM is forwarded based on hit in the MIP CCM DB
CCM is an acronym for
C
ontinuity
C
heck
M
essage.
It is a OAM frame transmitted from a MEP to it's peer MEP and used to
implement CC functionality.
CC is an acronym for
C
ontinuity
C
heck.
Содержание Falcon Gen-3 M-Class
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