Loss Measurement (Eth-Lm) - Nokia 7302 Basics, Management And Oam Manual

Ethernet Connection Fault Management
There is no way for the responding node to understand when a test is completed. For
this reason a configurable "inactivity-timer" determines the length of time a test is
valid. The timer will maintain an active test as long as it is receiving packets for that
specific test, defined by the test-id, remote MEP Id and source MAC. When there is
a gap between the packets that exceeds the inactivity-timer the responding node will
respond with a sequence number of one regardless of what the sequence number
was the instantiating node sent. This means the remote MEP believes the previous
test has expired and these probes are part of a new test. The default for the inactivity
timer is 100 second and has a range of ten to 100 seconds.
The responding node will be limited to 1000 concurrent test SLM tests. Any test that
attempts to involve a node that is already actively processing 1000 SLM tests will
show up as "out loss" or "unacknowledged" packets on the node that instantiated the
test because the packets will be silently discarded at the responder. It is important
for the operator to understand this is silent and no log entries or alarms will be raised.
Only the configuration is supported by HA. There will be no synchronization of data
between active and standby. Any unwritten, or active tests will be lost during a
switchover and the data will not be recoverable.
oam eth-cfm two-way-slm-test 00:07:72:A8:54:A8 domain
Sending 1 packets to 00:07:72:A8:54:A8 from MEP 1/3/2 (Test-id: 100005)
Sent 1 packets, 1 packets received from MEP ID 2, (Test-id: 100005)
# show eth-cfm mep 1 domain
==================================================================
Eth CFM Two-way SLM Test Result Table (Test-id: 100005)
==================================================================
Peer Mac Addr
------------------------------------------------------------------
00:07:72:a8:54:a8
==================================================================

8.8 Loss Measurement (ETH-LM)

Y.1731 loss measurement is used to collect counter values applicable for ingress
and egress service frames where the counters maintain a count of transmitted and
received data frames between a pair of MEPs. ETH-LM is performed by sending
frames with ETH-LM information to a peer MEP and similarly receiving frames with
ETH-LM information from the peer MEP. Each MEP performs frame loss
measurements. Only single ended loss measurement is supported.
178
(0 out-loss, 0 in-loss, 0 unacknowledged)
Remote MEP
3HH-11982-AAAA-TQZZA
"FD 100/320Gbps NT and FX NT IHub System
Basics, Management and OAM Guide"
3 association 2 two-way-slm-test
Count In Loss
2 1
3 association 2 mep 1
Out Loss
0 0
Issue: 10
Unack
0