display isis error

Function

The display isis error command displays the statistics of incorrect LSPs and Hello packets, which are received by an interface or a process.

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 on error LSP packets and Hello packets received by a specified IS-IS process.	The process ID is an integer ranging from 1 to 65535.
vpn-instance vpn-instance-name	Displays statistics on error LSP packets and Hello packets received by a specified VPN instance.	The name is a string of 1 to 31 case-sensitive characters without blank spaces.
interface	Displays statistics of error LSP packets and Hello packets received by all interfaces of a VPN instance or IS-IS process.	-
interface interface-type interface-number	Displays statistics of error LSP packets and Hello packets received by a specified interface.	-

Views

All views

Default Level

1: Monitoring level

Usage Guidelines

When abnormalities occur on an IS-IS process, you can run the display isis error command to view each type of incorrect packets.

When the IS-IS process ID or the VPN instance name is specified, you can specify the parameter interface to display the number of each type of incorrect packets that are received on all interfaces in the specified IS-IS process.

You can run the display isis error interface interface-type interface -number command to view the number of each type of incorrect packets that are received on the specified interface.

Example

# Display the statistics of incorrect packets received on all interfaces in IS-IS process 1.

<sysname> 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           Bad MT IS TLV           : 0
Bad MT ID TLV           : 0           Bad MT IPv6 TLV         : 0
Bad IPv6 Reach 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	Indicates the number of incorrect LSPs.
Longer LSP	Indicates the number of LSPs with the length greater than the value set through the lsp-length receive command.
Smaller LSP	Indicates the number of LSPs with the header length shorter than the fixed length.
Mismatched Level	Indicates the number of received LSPs with the level mismatching with the local IS-IS level.
Invalid Sysid	Indicates the number of LSPs with invalid system IDs.
Zero Sequence Number	Indicates the number of LSPs with the sequence number being 0.
Illegal IS Type	Indicates the number of LSPs with invalid IS types.
Zero Checksum	Indicates the number of LSPs with the checksum being 0.
Incorrect Checksum	Indicates the number of LSPs with the incorrect checksum.
Bad Authentication	Indicates the number of LSPs with the invalid authentication field.
Bad Auth Count	Indicates the number of LSPs with more than one authentication field.
More Protocol TLV	Indicates the number of LSPs with more than one protocol TLV.
Bad Nbr TLV	Indicates the number of LSPs with the incorrect neighbor TLV.
Bad Extended IS TLV	Indicates the number of LSPs with the incorrect extended IS TLV.
Bad IF Addr TLV	Indicates the number of LSPs with the incorrect interface address TLV.
Bad Reach TLV	Indicates the number of LSPs with the incorrect reachability TLV.
Bad Inter Domain TLV	Indicates the number of LSPs with the incorrect inter-domain TLV. The correct TLV is 0x83.
Mismatched Area Id(L1)	Indicates the number of LSPs with the mismatched Level-1 area ID.
Bad TLV Length	Indicates the number of LSPs with the incorrect TLV length.
Bad Alias TLV	Indicates the number of LSPs with the incorrect Alias TLV.
Bad Area TLV	Indicates the number of LSPs with the incorrect area TLV.
Bad SRLG TLV	Indicates the number of LSPs with the incorrect SRLG TLV.
Bad MT IS TLV	Indicates the number of LSPs with the incorrect MT IS TLV.
Bad MT ID TLV	Indicates the number of LSPs with the incorrect MT ID TLV.
Bad MT IPv6 TLV	Indicates the number of LSPs with the incorrect MT IPv6 TLV.
Bad IPv6 Reach TLV	Indicates the number of LSPs with the incorrect IPv6 Reach TLV.
Unknown Adjacency	Indicates the number of LSPs sent by the unknown adjacency.
Bad Protocol ID	Indicates the number of LSPs with the incorrect protocol ID.
Bad Version	Indicates the number of LSPs with the incorrect protocol version.
Zero Lifetime	Indicates the number of LSPs with the remaining lifetime is zero.
Bad Ext Reach TLV	Indicates the number of LSPs with the incorrect Ext Reach TLV.
Bad TE Router ID TLV	Indicates the number of LSPs with the incorrect TE Router ID TLV.
Bad TE Sub TLV	Indicates the number of LSPs with the incorrect TE sub-TLV.
Hello packet errors	Indicates the number of incorrect Hello packets.
Bad Packet Length	Indicates the number of Hello packets with the incorrect length.
Reserved CircType	Indicates the number of Hello packets with the incorrect reserved circuit type field.
Repeated System ID	Indicates the number of Hello packets with the repeated system ID.
Bad Circuit Type	Indicates the number of Hello packets with the incorrect circuit type.
Longer packet	Indicates the number of Hello packets with the length longer than the larger value between the interface MTU and the value set through the lsp-length originate command.
More Area Addr	Indicates the number of Hello packets with superfluous area addresses.
Longer Area Addr	Indicates the number of Hello packets with too long area addresses.
Bad Area Addr TLV	Indicates the number of Hello packets with the incorrect area address TLV.
More IF Addr	Indicates the number of Hello packets with superfluous interface addresses.
Bad Formatted IF TLV	Indicates the number of Hello packets with the incorrect interface TLV format.
More Nbr SNPA(LAN)	Indicates the number of Hello packets with superfluous Sub-network Points of Attachment (SNPAs) of a neighbor in a broadcast network.
Invalid Sysid	Indicates the number of Hello packets with the system ID length field not being 0 or 6.
Bad TLV Length	Indicates the number of Hello packets with the incorrect TLV length.
Zero HoldingTime	Indicates the number of Hello packets with the neighbor holding time being 0.
Unusable IP Addr	Indicates the number of Hello packets with the IP address not in the same network segment as the peer.
Repeated IPv4 Addr	Indicates the number of Hello packets with the repeated IPv4 address.
Mismatched Area Addr(L1)	Indicates the number of Hello packets with the mismatched Level-1 area address.
Mismatched Proto	Indicates the number of Hello packets with the mismatched protocol.
SNPA Conflicted(LAN)	Indicates the number of Hello packets with the conflicting SNPA in a broadcast network.
Mismatched Level	Indicates the number of received Hello packets with the level mismatching with the local IS-IS level.
Mismatched Max Area Addr	Indicates the number of Hello packets with the mismatched maximum number of area addresses.
Bad Authentication	Indicates the number of Hello packets with the invalid authentication field.
More Auth TLV	Indicates the number of Hello packets with superfluous authentication TLVs.
3-Way Option Error(P2P)	Indicates the number of Hello packets with the incorrect 3-Way information.
No Area Addr TLV	Indicates the number of Hello packets without the Area Addr TLV.
Bad Protocol ID	Indicates the number of Hello packets with the incorrect protocol ID.
Bad Version	Indicates the number of Hello packets with the incorrect protocol version.
Invalid IPv6 Addr	Indicates the number of Hello packets with the invalid IPv6 address.
More IPv6 IF Addr	Indicates the number of Hello packets with the number of carried IPv6 addresses greater than 11.
Duplicate IPv6 Addr	Indicates the number of Hello packets with the repeated IPv6 address.
More Optional Checksum	Indicates that more than one optional checksum TLV is contained in a packet.
Bad Optional Checksum	Indicates an error optional checksum TLV.