show isis counts

Displays IS-IS error statistics.

Syntax

show isis counts

Modes

Privileged EXEC mode

Usage Guidelines

IS-IS is supported on the Extreme 8820, SLX 9740, SLX 9640, and SLX 9540 devices only.

Output

The show isis counts command displays the following information:


Output field	Description
Area Mismatch	The number of times the device interface was unable to create a Level-1 adjacency with a neighbor because the device interface and the neighbor did not have any areas in common.
Max Area Mismatch	The number of times the device received a PDU whose value for maximum number of area addresses did not match the device‘s value for maximum number of area addresses.
System ID Length Mismatch	The number of times the device received a PDU whose ID field was a different length than the ID field length configured on the device.
LSP Sequence Number Skipped	The number of times the device received an LSP with a sequence number that was more than 1 higher than the sequence number of the previous LSP received from the same neighbor.
LSP Max Sequence Number Exceeded	The number of times the device attempted to set an LSP sequence number to a value higher than the highest number in the CSNP sent by the Designated IS.
Level-1 Database Overload	The number of times the Level-1 state on the device changed from Waiting to On or from On to Waiting. Waiting to On - This change can occur when the device recovers from a previous Level-1 LSP database overload and is again ready to receive new LSPs. On to Waiting - This change can occur when the device‘s Level-1 LSP database is full and the device receives an additional LSP, for which there is no room.
Level-2 Database Overload	The number of times the Level-2 state on the device changed from Waiting to On or from On to Waiting. The change from Waiting to On can occur when the device recovers from a previous Level-2 LSP database overload and is again ready to receive new LSPs. The change from On to Waiting can occur when the device‘s Level-2 LSP database is full and the device receives an additional LSP, for which there is no room.
Our LSP Purged	The number of times the device received an LSP that was originated by the device itself and had age zero (aged out).
PDU Drop Count
CSNP Auth Failures	The number of CSNP Authentication failures recorded for Level-1 and Level-2. This counter will only be displayed if it has a value greater than zero.
PSNP Auth Failures	The number of PSNP Authentication failures recorded for Level-1 and Level-2. This counter appears only if it has a value greater than 0.
HELLO Auth Failures	The number of HELLO Authentication failures recorded for Level-1 and Level-2. This counter will only be displayed if it has a value greater than zero.
Adjacency not found	The number of PDUs dropped at both Level-1 and Level-2 because there is no valid adjacency on the interface where they were received. This counter will only be displayed if it has a value greater than zero.
Adjacency Level Mismatch	The number of PDUs dropped at both Level-1 and Level-2 because the adjacency from which the PDU is received has a different level than the PDU level. This counter will only be displayed if it has a value greater than zero.
IS Level Mismatch	The number of PDUs dropped at both Level-1 and Level-2 because the IS-IS router level mismatches with the PDU level received. This counter will only be displayed if it has a value greater than zero.
Length Too Short	The number of PDUs dropped at both Level-1 and Level-2 because the received PDU length is less than the standard PDU header length. This counter will only be displayed if it has a value greater than zero.
Length Too Long	The number of PDUs dropped at both Level-1 and Level-2 because the received PDU length is greater than the MTU of the link. This counter will only be displayed if it has a value greater than zero.
Max Area Check Failure	The number of PDUs dropped at both Level-1 and Level-2 because the received PDU has a maximum area count different than what is configured on this IS-IS router. This counter will only be displayed if it has a value greater than zero.
Zero Checksum	The number of PDUs dropped at both Level-1 and Level-2 because the received PDU has a zero checksum. This counter will only be displayed if it has a value greater than zero.
Checksum Mismatch	The number of PDUs dropped at both Level-1 and Level-2 because the received PDU has a checksum different than the computed checksum on the received PDU. This counter will only be displayed if it has a value greater than zero.
Invalid Length	The number of PDUs dropped at both Level-1 and Level-2 because the received PDU has a different length than what is advertised in the PDU header. This counter will only be displayed if it has a value greater than zero.

Examples

The following example displays sample output from the show isis counts command.

device# show isis counts

 Area Mismatch: 0
 Max Area Mismatch: 0
 System ID Length Mismatch: 0
 LSP Sequence Number Skipped: 0
 LSP Max Sequence Number Exceeded: 0
 Level-1 Database Overload: 0
 Level-2 Database Overload: 0
 Our LSP Purged: 0