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Limitations, Restrictions, and Notes
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PXM1E
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Release Notes for Cisco MGX 8850 (PXM45), MGX 8850 (PXM1E), and MGX 8830, Software Release 3.0.10
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stopimalnktst
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delimalnk
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Any of the following operations can extend the delay removal completion by 9 seconds.
IMA link deletion at *FE*
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IMA group restart at *FE*
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IMA link transition into Unusable state at *FE*
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IMA link entrance into LIF failure at *NE*
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Then the group will be restarted and it may take another 3 seconds to become operational. The group
will be restarted even if delay process completes sooner and any of the operations listed above
occurs.
GTSM (Group Traffic State Machine) UP and DOWN integration times should be configured to a
value of 0 for all IMA groups. Any positive value, especially the UP time, will delay the operational
state of any port(s), configured on the IMA group, from becoming active. This can cause more than
desired traffic loss during a card switchover.
BERT is supported only on the T1 interfaces. It is not supported on the E1 interfaces.
The maximum number of connections on the PXM1E cards (except for the PXM1E-16-T1E1 card)
is 27K, and the maximum number of ports on these cards (except for the PXM1E-16-T1E1 card) is
4K.
The dspapsbkplane command does not work for the PXM1E-4-155 card.
An LOS condition on an APS line will not be reported by the dspalms command if both the
following are true:
The PXM1E card has SONET lines, and
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Either the APS line with the LOS condition is the Protection line for intracard APS, or the APS
line with the LOS condition is the adjacent back card line for intercard APS. For example, if
line 1 on slot 7 is the Working line and line 1 on slot 8 is the Protection line, then an LOS on
line 1 in slot 8 will not be reported when dspalms is issued on slot 7, assuming slot 7 has the
Active front card. The dspadjlnalm command will also not report LOS in this situation.
All other conditions (LOF, OOF, etc.) are reported correctly (refer to caveat CSCdy30310).
For uplink ports on all PXM1E cards, the standby controller card is not able to derive clock signals
from the standby uplink port (daughter card) due to a hardware limitation. No data signals can be
received on the standby card and clock signals cannot be recovered. On switchovers, the uplink
clock sources will be requalified (refer to caveat CSCdy68971).
When a back card is inserted or removed, verify that the back card is accessible by reading a register
on the back card. If the front card is not able to read the register, the back card will be put into the
mismatch state. If the problem happens on the active card and if the standby card is available, card
will be switched over. Otherwise the back card is put into mismatch state. If the problem also
happens on the standby card, the backcard will be put into mismatch state. A message will be put
into dsplog to show that the back card is not considered to be in a healthy state. This message should
be ignored when it is logged when the card is in the Init (I) state. Only messages logged in either the
Active (A) or Standby (S) states are valid.
OL-2914-01 Rev D0, July 3, 2003
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