display isis error
Function
The display isis error command displays the statistics of the incorrect Link State PDUs (LSPDUs) and Hello packets received by an interface or a process.
Parameters
| Parameter | Description | Value |
|---|---|---|
| process-id |
Specifies an IS-IS process. If no IS-IS process is specified, statistics about incorrect LSPs and Hello packets received by all local IS-IS processes are displayed. |
The value is an integer ranging from 1 to 4294967295. |
| vpn-instance vpn-instance-name |
Specifies a VPN instance. |
The value is a string of 1 to 31 case-sensitive characters, spaces not supported. In addition, the VPN instance name must not be _public_. When double quotation marks are used around the string, spaces are allowed in the string. |
| interface |
Displays statistics about incorrect LSPs and Hello packets received by all interfaces. |
- |
| interface interface-name |
Specifies the name of an interface. |
- |
| interface interface-type interface-number |
Specifies the type and number of an interface. |
- |
Usage Guidelines
Usage Scenario
When an IS-IS fault occurs, you can run the display isis error command to view various incorrect packets.
You can run the display isis error interface command to view the number of each type of incorrect packets that are received on a specified interface. If the statistics in an entry are not 0, the corresponding interface or process has received incorrect packets. If the statistics keep increasing rapidly, locate the fault based on the error type.Example
The actual command output varies according to the device. The command output here is only an example.
<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 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 Bad SID Sub TLV : 0
LSP Lifetime less than 300s: 0 Bad IID TLV : 0
Bad Locator TLV : 0 Bad End Sub TLV : 0
Bad SRLB Sub TLV : 0 Bad Bier Sub TLV : 0
Bad IPv6 SRLG TLV : 0 Bad MSD Sub TLV : 0
Bad SRV6 Mirror Sub TLV : 0 Bad IPv6 LSRID TLV : 0
Bad SR Binding TLV : 0 Ignored LSP Number : 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
Bad IID TLV : 0 No Common IID : 0
--------------------------------------------------------------------
| Item | Description |
|---|---|
| LSP packet errors | Number of incorrect LSPs. |
| LSP Lifetime less than 300s | Number of LSPs that are generated by another device and has a Remaining Lifetime value less than 300s (the locally configured one). |
| Longer LSP | Number of LSPs with the length greater than the fixed length. |
| Longer packet | Number of Hello packets with the length greater than the larger value between the interface MTU and the value set using the lsp-length originate command. |
| Longer Area Addr | Number of Hello packets with too long area addresses. |
| Smaller LSP | Number of LSPs with the header length shorter than the fixed length. |
| Mismatched Level | Number of LSPs with the level mismatching the local IS-IS level. |
| Mismatched Area Id(L1) | Number of Hello packets with mismatched Level-1 area ID. |
| Mismatched Area Addr(L1) | Number of Hello packets with mismatched Level-1 area addresses. |
| Mismatched Proto | Number of Hello packets with mismatched protocols. |
| Mismatched Level | Number of Hello packets with mismatched IS-IS levels. |
| Mismatched Max Area Addr | Number of Hello packets with mismatched maximum area addresses. |
| Invalid Sysid | Number of LSPs with invalid system IDs. |
| Invalid Sysid | Number of Hello packets with invalid system IDs. |
| Invalid IPv6 Addr | Number of Hello packets with invalid IPv6 addresses. |
| Zero Sequence Number | Number of LSPs with sequence number 0. |
| Zero Checksum | Number of LSPs with checksum 0. |
| Zero Lifetime | Number of LSPs with remaining lifetime 0. |
| Zero HoldingTime | Number of Hello packets with neighbor holding time 0. |
| Illegal IS Type | Number of LSPs with invalid IS-IS types. |
| Incorrect Checksum | Number of LSPs with incorrect checksum. |
| Bad Authentication | Number of LSPs with invalid authentication fields. |
| Bad Auth Count | Number of LSPs carrying an incorrect number of authentication fields. |
| Bad Protocol TLV | Number of LSPs with incorrect protocol TLVs. |
| Bad Nbr TLV | Number of LSPs with incorrect neighbor TLVs. |
| Bad Extended IS TLV | Number of LSPs with incorrect extended IS TLVs. |
| Bad IF Addr TLV | Number of LSPs with incorrect interface address TLVs. |
| Bad Reach TLV | Number of LSPs with incorrect Reach TLVs. |
| Bad Inter Domain TLV | Number of LSPs with incorrect inter-domain TLVs (not 0x83). |
| Bad TLV Length | Number of LSPs with incorrect TLV lengths. |
| Bad Alias TLV | Number of LSPs with incorrect Alias TLVs. |
| Bad Area TLV | Number of LSPs with incorrect area TLVs. |
| Bad SRLG TLV | Number of LSPs with incorrect SRLG TLVs. |
| Bad MT IS TLV | Number of LSPs with incorrect MT IS TLVs. |
| Bad MT ID TLV | Number of LSPs with incorrect MT ID TLVs. |
| Bad MT IPv6 TLV | Number of LSPs with incorrect MT IPv6 TLVs. |
| Bad IPv6 Reach TLV | Number of LSPs with incorrect IPv6 Reach TLVs. |
| Bad Protocol ID | Number of LSPs with incorrect protocol IDs. |
| Bad Version | Number of LSPs with incorrect protocol versions. |
| Bad Ext Reach TLV | Number of LSPs with incorrect Ext Reach TLVs. |
| Bad TE Router ID TLV | Number of LSPs with incorrect TE Router ID TLVs. |
| Bad TE Sub TLV | Number of LSPs with incorrect TE sub-TLVs. |
| Bad IID TLV | Number of LSPs or Hello packets with incorrect IID TLVs. |
| Bad Locator TLV | Number of LSPs with incorrect Locator TLVs. |
| Bad End Sub TLV | Number of LSPs with incorrect End Sub TLVs. |
| Bad Packet Length | Number of Hello packets with incorrect lengths. |
| Bad Circuit Type | Number of Hello packets with incorrect circuit types. |
| Bad Area Addr TLV | Number of Hello packets with incorrect area address TLVs. |
| Bad Formatted IF TLV | Number of Hello packets with incorrect interface TLV formats. |
| Bad Authentication | Number of Hello packets with invalid authentication fields. |
| Bad Optional Checksum | Number of LSPs with error Optional Checksum TLV. |
| Bad SRLB Sub TLV | Number of LSPs with incorrect SRLB Sub TLVs. |
| Bad IPv6 SRLG TLV | Number of LSPs with incorrect IPv6 SRLG TLVs. |
| Bad Bier Sub TLV | Number of LSPs with incorrect Bier Sub TLVs. |
| Bad MSD Sub TLV | Number of LSPs with incorrect MSD Sub TLVs. |
| Bad SRV6 Mirror Sub TLV | Number of LSPs with incorrect SRV6 Mirror Sub TLVs. |
| Bad IPv6 LSRID TLV | Number of LSPs with incorrect IPv6 LSRID TLVs. |
| Bad SR Binding TLV | Number of LSPs with incorrect SR Binding TLVs. |
| More Protocol TLV | Number of LSPs with more than one protocol TLV. |
| More Area Addr | Number of Hello packets with superfluous area addresses. |
| More IF Addr | Number of Hello packets with superfluous interface addresses. |
| More Nbr SNPA(LAN) | Number of Hello packets with superfluous Sub-network Points of Attachments (SNPAs) of a neighbor in a broadcast network. |
| More Auth TLV | Number of Hello packets with superfluous authentication TLVs. |
| More IPv6 IF Addr | Number of Hello packets with more than 11 IPv6 addresses. |
| More Optional Checksum | Number of LSPs with more than one Optional Checksum TLV. |
| Unknown Adjacency | Number of LSPs sent by an unknown adjacency. |
| Ignored LSP Number | Number of ignored LSPs (the function of ignore-receive-lsp). |
| Hello packet errors | Number of incorrect Hello packets. |
| Reserved CircType | Number of Hello packets with incorrect reserved circuit type fields. |
| Repeated System ID | Number of Hello packets with repeated system IDs. |
| Repeated IPv4 Addr | Number of Hello packets with repeated IPv4 addresses. |
| Unusable IP Addr | Number of Hello packets with the IP address in a different network segment from that of the peer. |
| SNPA Conflicted(LAN) | Number of Hello packets with conflicted SNPAs on a broadcast network. |
| 3-Way Option Error(P2P) | Number of Hello packets with incorrect 3-Way handshake information. |
| No Area Addr TLV | Number of Hello packets without area address TLVs. |
| No Common IID | Number of Hello packets in which the IID is different from the local IID. |
| Duplicate IPv6 Addr | Number of Hello packets with repeated IPv6 addresses. |