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byte_cnt_mismatch contains the number of times a packet is
dropped due to the transmit packet size field not being equal to the
transmit packet fragment size field.
cerr contains the number of transceiver self-test failures on circuit
cct. Some transceivers assert the collision signal during the interpacket
delay period to verify the channel between the transceiver and the local
area controller (SONIC). Such self-tests are usually referred to as SQE
(Signal Quality Error) or “heartbeat”. A test failure (defined as the
absence of a collision signal within 2.0 µs of the cessation of transmis-
sion) may indicate transceiver malfunction or a faulty transmission path
between the SONIC and the transceiver.
deferred_tx contains the number of deferred transmissions on
circuit cct. A deferred transmission indicates that the physical medium
was busy (the carrier sense signal was .TRUE.) when the local area
controller (SONIC) had a frame for transmittal. In such an instance, the
SONIC waits for the carrier sense signal to go to .FALSE., pauses for an
interframe spacing interval, and then attempts to transmit the waiting
frame.
dls_ret_rx contains the number of frames, received by circuit cct,
that were later returned by the data-link service (DLS) software. Within
the router software architecture, DLS resides between the driver and
application software. It performs such services as multiplexing/
demultiplexing or encapsulation/deencapsulation. DLS can return
frames for numerous reasons (many of which are application-specific):
for example, because of unknown internal service access points
(ISAPs), because of user-specified filtering requirements contained
within the configuration, or because of lack of enabled entities (for
example, IP, IPX, etc.).
dls_ring_cnt contains the current number of packets received by
circuit cct and currently in transit to data-link service (DLS).
excessv_colln_tx contains the number of excessive collision errors
on circuit cct. An excessive collision error occurs when the local area
controller (SONIC) has detected collisions on the medium in 16
successive attempts to transmit a frame. After 16 unsuccessful transmis-
sion attempts, the SONIC drops the frame, increments this counter, and
transmits the next frame on its transmit queue.
Managment
Information Base
18
Management Information Base Variables
cct: Circuits Information Base
18-31