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show pgm negative-acknowledgments

Syntax



show pgm negative-acknowledgments

Release Information

Command introduced before JUNOS Release 7.4.

Description

Display the sent or received Pragmatic General Multicast (PGM) negative acknowledgments (NAKs), the source-path message (SPM) sequence number being negatively acknowledged, and the current state of repair.

Options

This command has no options.

Required Privilege Level

view

List of Sample Output

show pgm negative-acknowledgments

Output Fields

Table 53 describes the output fields for the show pgm negative-acknowledgments command. Output fields are listed in the approximate order in which they appear.

Table 53: show pgm negative-acknowledgments Output Fields

Field Name	Field Description
Global source id	Global source identifier (GSI), which combines with the source port to determine the transport session identifier (TSI).
Network layer address	Network layer address of the local system.
Source port	Source port number, which is combined with the GSI to determine the TSI.
SPM sequence number	Numeric sequence identifier of the source-path message.
Window (trailing/leading sequence)	Range of sequence numbers used by the source for sequentially numbering and transmitting the most recent packets. The trailing (or left) edge of the transmit window is the sequence number of the oldest data packet available for repair from a source. The leading (or right) edge of the transmit window is defined as the sequence number of the most recent data packet a source has transmitted.
Outstanding NAKS	Total number of outstanding negative acknowledgments sent or received by the local system. NAK packets indicate that a packet in the expected original data sequence has been detected as missing. Sequence number—Numeric sequence identifier of the source-path message. Group—Group address. Source—Multicast source. Interface—Interface name. Receiver—IP address receiving the multicast.

Sample Output

show pgm negative-acknowledgments

user@host> show pgm negative-acknowledgments

Global source ID: 010203040506 Source port: 1111
      Network layer address: 10.38.0.1
      SPM sequence number: 1
      Window (trailing/leading sequence): 0/1
      Outstanding NAKs:
              Sequence number: 1
              Group: 225.1.1.1
              Source: 192.168.195.121
              Interface: t3-0/2/0:0 Receiver: 10.38.0.10

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