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).