Table 144: ATM show interfaces Output Fields (continued)
Level of OutputField DescriptionField Name
extensiveATM statistics for the interface:
• Uncorrectable HCS errors—Number of cells dropped because the cell
delineation failed. These errors most likely indicate that a SONET/SDH layer
problem has occurred.
• Correctable HCS errors—Number of correctable HCS errors that occurred. The
cell delineation process can recover from these errors and locate the ATM
cell boundary, although the framing process is not quite stable. The ATM cell
is not dropped. This counter increases when the cell delineation process
changes its state from present to sync (for example, when a cable is plugged
into the interface).
The following error statistics are from the framer:
• Tx cell FIFO overruns—Number of overruns in the transmit FIFO.
• Rx cell FIFO overruns—Number of overruns in the receive FIFO.
• Rx cell FIFO underruns—Number of underruns in the receive FIFO.
• Input cell count—Number of ATM cells received by the interface (not including
idle cells).
• Output cell count—Number of ATM cells transmitted by the interface (including
idle cells).
• Output idle cell count—Number of idle cells sent by the port. When ATM has
nothing to send, it sends idle cells to fill the time slot.
• Output VC queue drops—Number of packets dropped by a port on the PIC.
Packets are dropped because of queue limits on the VCs.
The following error statistics are from the SAR:
• Input no buffers—Number of AAL5 packets dropped because no channel
blocks or buffers were available to handle them.
• Input length errors—Number of AAL5 packets dropped because their length
was incorrect. Usually, these errors occur because a cell has been corrupted
or lost, or because the length field was corrupted. They can also mean the
AAL5 length field was zero.
• Input timeouts—Number of AAL5 packets dropped because of a reassembly
timeout.
• Input invalid VCs—Number of AAL5 packets dropped because the header
was unrecognized (because the VC was not correct or not configured).
• Input bad CRCs—Number of AAL5 packets dropped because of frame check
sequence errors.
• Input OAM cellno buffers—Number of received OAM cells or raw cells dropped
because no buffers were available to handle them.
• L2 circuit out-of-sequence packets—(Layer 2 AAL5 mode) Number of AAL5
packets that are out of sequential order.
• Denied packets count—The number of packets dropped due to VLAN priority
deny packets or due to an error forwarding configuration that might cause a
negative frame length, that is, the stripping size is larger than the packet size.
ATM Statistics
extensiveInformation about the configuration of the Packet Forwarding Engine:
• Destination slot—FPC slot number.
Packet Forwarding
Engine
configuration
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ACX Series Universal Access Router Configuration Guide
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