Table 162: show isis statistics Output Fields
Field DescriptionField Name
PDU type:
• CSNP—Complete sequence number PDUs contain a complete list of all link-state PDUs in the IS-IS
database. CSNPs are sent periodically on all links, and the receiving systems use the information
in the CSNP to update and synchronize their link-state PDU databases. The designated router
multicasts CSNPs on broadcast links in place of sending explicit acknowledgments for each
link-state PDU.
• IIH—IS-IS hello packets are broadcast to discover the identity of neighboring IS-IS systems and to
determine whether the neighbors are Level 1 or Level 2 intermediate systems.
• LSP—Link-state PDUs contain information about the state of adjacencies to neighboring IS-IS
systems. Link-state PDUs are flooded periodically throughout an area.
• PSNP—Partial sequence number PDUs are sent multicast by a receiver when it detects that it is
missing a link-state PDU (when its link-state PDU database is out of date). The receiver sends a
PSNP to the system that transmitted the CSNP, effectively requesting that the missing link-state
PDU be transmitted. That routing device, in turn, forwards the missing link-state PDU to the
requesting routing device.
• Unknown—The PDU type is unknown.
PDU type
Number of PDUs received since IS-IS started or since the statistics were set to zero.Received
Number of PDUs received less the number dropped.Processed
Number of PDUs dropped.Drops
Number of PDUs transmitted since IS-IS started or since the statistics were set to zero.Sent
Number of PDUs retransmitted since IS-IS started or since the statistics were set to zero.Rexmit
Total number of PDUs received and transmitted since IS-IS started or since the statistics were set to
zero.
Total packets
received/sent
Number of CSPN and PSNP packets currently waiting in the queue for processing. This value is almost
always 0.
SNP queue length
Number of link-state PDUs waiting in the queue for processing. This value is almost always 0.LSP queue length
Number of shortest-path-first (SPF) calculations that have been performed. If this number is
incrementing rapidly, it indicates that the network is unstable.
SPF runs
Number of link-state PDU fragments that the local system has computed.Fragments rebuilt
Number of link-state PDUs that have been regenerated. A link-state PDU is regenerated when it is
nearing the end of its lifetime and it has not changed.
LSP regenerations
Number of purges that the system initiated. A purge is initiated if the software decides that a link-state
PDU must be removed from the network.
Purges initiated
Copyright © 2017, Juniper Networks, Inc.2712
ACX Series Universal Access Router Configuration Guide
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