Managing System Alarms
173
Group [n]
Insufficient Links
ATM Forum (R-130)
The near end finds not enough
available links.
This occurs when the near end
has completed parameter
negotiation with the far end,
but is neither passing data nor
blocked.
Check and correct any faulty IMA links.
Check and correct IMA minimum links
parameter.
Group [n] Lack of
Link
The near end is idling because
it does not have enough links
in an IMA group. This occurs
only after group parameters
are negotiated. When this
occurs, the “NE Insufficient
Links” alarm is also reported.
Take the group down, and stop passing
data in all links.
Group [n] Link
Down
Summary information alarm to
indicate one or more alarms on
this IMA group are active.
Information only.
Group [n] Link Up
Summary informational alarm
to indicate all alarms on the
IMA group are cleared.
Information only.
Group [n] N<P
There are fewer configured
links than IMA links required to
make an IMA group active.
Continue passing data.
Group [n] No Link
The near end has lost all its
links in an IMA group because
these links have AFA, LOS, AIS,
OOF, LCD, or missing ICP cells.
This invalidates all the far end
identity.
If one or more links comes back,
re-identify the link(s) and renegotiate
parameters with the far end group.
Group [n] Multi
IMA ID
Different group IMA ID
received on different links in an
IMA group.
Correct link connections and/or IMA
group configuration.
Group [n] Multi Test
ATM Forum (R-138)
Different test procedure
request from different links in
an IMA group from the far
end.
Use the test procedure from the lowest
logical link and ignore the other test
procedures.
Group [n] Multiple
M
Different frame lengths
received on different links in an
IMA group.
Make sure that the IMA frame length is
set to the same value for all links.
Group [n] Multiple
Symmetry
Different group symmetry
received on different links in an
IMA group (symmetrical versus
asymmetrical operation).
Configure the group to be symmetric.
3Com PathBuilder switches do not
support asymmetric bandwidth for
IMA.
Group [n] Time
Sync Fail
The far end transmit clocking
mode does not match the near
end transmit clocking mode
Check configuration. Only CTC
(Common Transfer Clock) is supported.
If the far end transport clocking is set to
ITC (Independent Transfer Clock),
change it to CTC.
IMA Protocol
Mismatch
IMA label is not ATM Forum
1.0.
Near end and far end IMA protocol
versions do no match. Check and
correct incompatibility.
IMA Remote
Loopback
Far end loopback detected,
external cable loopback or
crosstalk.
Remove loopback condition.
(continued)
Table 11
T1/E1 UNI with IMA Module Alarms (continued)
Alarm
Meaning
Troubleshooting Steps
