|
PGM type, # received, # sent
|
Number of packets received and
sent for the following PGM packet types:
-
SPM—Number of total source path messages
received and sent by the local system. Source path messages (SPMs)
are sent by a source to establish the source path state in network
elements and to provide the transmit-window state to receivers.
-
POLL—Total number of poll requests received
and sent by the local system.
-
POLR—Total number of poll responses received
and sent by the local system.
-
ODATA—Total number of original data packets
received and sent by the local system.
-
RDATA—Total number of repair data packets
received and sent by the local system. RDATA packets are generated
in response to negative acknowledgments (NAKs), which indicate a missing
packet from the original data sequence.
-
NAK—Total number of negative acknowledgments
received and sent by the local system. NAK packets indicate that a
packet in the expected original data sequence has been detected as
missing.
-
NULLNAK—Total number of null negative acknowledgments
received and sent by the local system. NULLNAKs are transmitted by
a designated local repairer that receives NAKs redirected to it by
either receivers or network elements to provide flow-control feedback
to a source.
-
NCF—Total number of NAK confirmations received
and sent by the local system. NAK confirmations are generated in response
to NAK packets that are received.
-
SPMR—Total number of source path message
requests (SPMRs) received and sent by the local system. SPMRs are
used to solicit a source path message from a source in a nonimplosive
way. The typical application is for late-joining receivers to solicit
source path messages directly from a source in order to be able to
send NAKs for missing packets, without having to wait for a regularly
scheduled source path message from that source.
-
OTHER—Total number of other PGM packets
received and sent by the local system.
|
|
packets shorter than minimum
PGM header length
|
Total number of packets received
with headers that are shorter than the minimum required PGM header
length.
|
|
packets received with incorrect
check sum
|
Total number of packets received
with an incorrect checksum. The checksum field is the 1's complement
of the 1's complement sum of the entire PGM packet, including the
header.
|
|
packets received with zero
check sum
|
Total number of packets received
with a zero checksum. If the computed checksum is zero, it is transmitted
as all ones. A value of zero in this field means that the transmitter
generated no checksum.
|
|
packets received with TSDU
length incorrect
|
Total number of packets received
with an incorrect Transport Service Data Unit (TSDU) length (16
bits).
|
|
packets received with SPM length
incorrect
|
Total number of packets received
with an incorrect source path message length.
|
|
packets received with unknown
SPM address family
|
Total number of packets received
with an unknown source path message address family indicator (AFI).
|
|
packets received with NAK length
incorrect
|
Total number of packets received
with an incorrect NAK length.
|
|
packets received with unknown
NAK address family
|
Total number of packets received
with an unknown NAK address family indicator (AFI).
|
|
packets received with NAK for
unknown TSI
|
Total number of NAK packets received
with an unknown transport session identifier (TSI).
|
|
packets received when NAK throttled
|
Total number of packets received
when NAK is throttled.
|
|
packets received with NCF length
incorrect
|
Total number of packets received
with an incorrect NAK confirmation length.
|
|
packets received with unknown
NCF address family
|
Total number of packets received
with an unknown NAK confirmation address family indicator (AFI).
|
|
packets received with NCF for
unknown TSI
|
Total number of NAK confirmation
packets received with an unknown transport session identifier (TSI).
|
|
packets received with RDATA
length incorrect
|
Total number of packets received
with an incorrect RDATA length.
|
|
packets received with RDATA
for unknown TSI
|
Total number of RDATA packets received
with an unknown transport session identifier (TSI).
|
