display isis error

Function

The display isis error command displays statistics about error LSPs and Hello packets that are received by IS-IS interfaces or processes.

Format

display isis error [ { process-id | vpn-instance vpn-instance-name } [ interface ] ]

display isis error interface interface-type interface-number

Parameters

Parameter	Description	Value
process-id	Displays statistics about error packets received by a specified IS-IS process.	The value is an integer that ranges from 1 to 65535.
vpn-instance vpn-instance-name	Displays statistics about error packets received by the IS-IS process in a specified VPN instance.	The value must be an existing VPN instance name.
interface	Displays statistics about error packets received on all interfaces in a specified IS-IS process or VPN instance.	-
interface-type interface-number	Displays statistics about error packets received by a specified interface.	-

Views

All views

Default Level

1: Monitoring level

Usage Guidelines

You can run the display isis error command to check statistics about error LSPs and Hello packets that are received by IS-IS interfaces or processes.

Example

# Display statistics about error LSPs and Hello packets received on all interfaces in IS-IS process 1.

<HUAWEI> display isis error 1
                    Statistics of error packets for ISIS(1)                     
                    ---------------------------------------                     
LSP packet errors:                                                              
Longer LSP              : 0           Smaller LSP             : 0               
Mismatched Level        : 0           Invalid Sysid           : 0               
Zero Sequence Number    : 0           Illegal IS Type         : 0               
Zero Checksum           : 0           Incorrect Checksum      : 0               
Bad Authentication      : 0           Bad Auth Count          : 0               
More Protocol TLV       : 0           Bad Nbr TLV             : 0               
Bad Extended IS TLV     : 0           Bad IF Addr TLV         : 0               
Bad Reach TLV           : 0           Bad Inter Domain TLV    : 0               
Mismatched Area Id(L1)  : 0           Bad TLV Length          : 0               
Bad Alias TLV           : 0           Bad Area TLV            : 0               
Bad SRLG TLV            : 0           Unknown Adjacency       : 0               
Bad Protocol ID         : 0           Bad Version             : 0               
Zero Lifetime           : 0           Bad Ext Reach TLV       : 0               
Bad TE Router ID TLV    : 0           Bad TE Sub TLV          : 0               
                                                                                
Hello packet errors:                                                            
Bad Packet Length       : 0           Reserved CircType       : 0               
Repeated System ID      : 0           Bad Circuit Type        : 0               
Longer packet           : 0           More Area Addr          : 0               
Longer Area Addr        : 0           Bad Area Addr TLV       : 0               
More IF Addr            : 0           Bad Formatted IF TLV    : 0               
More Nbr SNPA(LAN)      : 0           Invalid Sysid           : 0               
Bad TLV Length          : 0           Zero HoldingTime        : 0               
Unusable IP Addr        : 0           Repeated IPv4 Addr      : 0               
Mismatched Area Addr(L1): 0           Mismatched Proto        : 0               
SNPA Conflicted(LAN)    : 0           Mismatched Level        : 0               
Mismatched Max Area Addr: 0           Bad Authentication      : 0               
More Auth TLV           : 0           3-Way Option Error(P2P) : 0               
No Area Addr TLV        : 0           Bad Protocol ID         : 0               
Bad Version             : 0           Invalid IPv6 Addr       : 0               
More IPv6 IF Addr       : 0           Duplicate IPv6 Addr     : 0               
More Optional Checksum  : 0           Bad Optional Checksum   : 0               
--------------------------------------------------------------------

**Table 1** Description of the display isis error command output
Item	Description
LSP packet errors	LSP errors.
Longer LSP	The LSP length is greater than the value set using the lsp-length receive command.
Smaller LSP	The LSP header length is smaller than the fixed length.
Mismatched Level	The level of received LSPs mismatches the local IS-IS level.
Invalid Sysid	The system ID in an LSP is invalid.
Zero Sequence Number	The sequence number of an LSP is 0.
Illegal IS Type	The IS type is invalid.
Zero Checksum	The checksum of an LSP is 0.
Incorrect Checksum	The checksum of an LSP is incorrect.
Bad Authentication	The authentication field of an LSP is incorrect.
Bad Auth Count	The number of authentication fields carried in an LSP is incorrect, that is, it is greater than 1.
More Protocol TLV	The number of protocol TLVs in an LSP is greater than 1.
Bad Nbr TLV	The neighbor TLV is incorrect.
Bad Extended IS TLV	The extended IS TLV is incorrect.
Bad IF Addr TLV	The interface address TLV is incorrect.
Bad Reach TLV	The reachability TLV is incorrect.
Bad Inter Domain TLV	The inter-domain TLV is incorrect. The correct TLV is 0x83.
Mismatched Area Id(L1)	Mismatched Level-1 area ID.
Bad TLV Length	The TLV length is incorrect.
Bad Alias TLV	The Alias TLV is incorrect.
Bad Area TLV	The area TLV is incorrect.
Bad SRLG TLV	The SRLG TLV is incorrect.
Unknown Adjacency	LSPs are received from unknown adjacency.
Bad Protocol ID	The protocol ID is incorrect.
Bad Version	The version is incorrect.
Zero Lifetime	The remaining lifetime of an LSP is 0.
Bad Ext Reach TLV	The Ext Reach TLV is incorrect.
Bad TE Router ID TLV	The TE Router ID TLV is incorrect.
Bad TE Sub TLV	The TE sub-TLV is incorrect.
Hello packet errors	Hello packet errors.
Bad Packet Length	The Hello packet length is incorrect.
Reserved CircType	The reserved link type is incorrect.
Repeated System ID	The system ID is repeated.
Bad Circuit Type	The link type is incorrect.
Longer packet	The Hello packet length is greater than the larger value between the interface MTU and the value set using the lsp-length originate command.
More Area Addr	Area addresses are superfluous.
Longer Area Addr	The area address is too long.
Bad Area Addr TLV	The area address TLV is incorrect.
More IF Addr	Interface addresses are superfluous.
Bad Formatted IF TLV	The format of the interface TLV is incorrect.
More Nbr SNPA(LAN)	Sub-network Points of Attachment (SNPAs) of a neighbor on a broadcast network are superfluous.
Invalid Sysid	The system ID length field is not 0 or 6.
Bad TLV Length	The TLV length is incorrect.
Zero HoldingTime	The neighbor holdtime is 0.
Unusable IP Addr	The IP address is on a different network segment than the peer end.
Repeated IPv4 Addr	The IPv4 address is repeated.
Mismatched Area Addr(L1)	Mismatched Level-1 area address.
Mismatched Proto	Mismatched protocol.
SNPA Conflicted(LAN)	Conflicting SNPA on a broadcast network.
Mismatched Level	The level of received Hello packets mismatches the local IS-IS level.
Mismatched Max Area Addr	The maximum area address is incorrect.
Bad Authentication	The authentication field of a Hello packet is incorrect.
More Auth TLV	Authentication TLVs are superfluous.
3-Way Option Error(P2P)	3-way information is incorrect.
No Area Addr TLV	The received Hello packet has no area address TLV.
Bad Protocol ID	The protocol ID is incorrect.
Bad Version	The version is incorrect.
Invalid IPv6 Addr	An IPv6 address is invalid.
More IPv6 IF Addr	A Hello packet carries more than 11 IPv6 addresses.
Duplicate IPv6 Addr	The IPv6 address is repeated.
More Optional Checksum	More than one optional checksum TLV is contained in a packet.
Bad Optional Checksum	Error optional checksum TLV.