show isis interface

Displays information about IS-IS interfaces for a device.

Syntax

show isis interface

show isis interface brief

show isis interface ethernet slot/port

show isis interface loopback number

show isis interface port-channel number

show isis interface ve vlan_id

Parameters

brief: Specifies a brief summary of IP interface IS-IS interface information.
ethernet slot / port: Specifies an Ethernet slot and port.
loopback number: Specifies a loopback interface. Valid values range from 1 through 255.
port-channel number: Specifies a port-channel interface.
ve vlan_id: Specifies a virtual Ethernet (VE) interface. Valid values range from 1 through 4096.

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 interface command displays the following information:


Output field	Description
Total number of IS-IS interfaces	The number of interfaces on which IS-IS is enabled.
Interface	The interface number to which the information listed below applies.
Circuit State	The state of the circuit, which can be one of the following: DOWN UP
Circuit Mode	The IS-IS type in use on the circuit. The mode can be one of the following: LEVEL-1 LEVEL-2 LEVEL-1-2
Circuit Type	The type of IS-IS circuit running on the interface. The circuit type can be one of the following: BCAST (broadcast). PTP (Point-to-Point)
Passive State	The passive state determines whether the interface is allowed to form an IS-IS adjacency with the IS at the other end of the circuit. The state can be one of the following: FALSE - The passive option is disabled. The interface can form an adjacency with the IS at the other end of the link. TRUE - The passive option is enabled. The interface cannot form an adjacency, but can still advertise itself into the area.
Circuit Number	The ID that the instance of IS-IS running on the interface applied to the circuit between this interface and the interface at the other end of the link.
MTU	The maximum length supported for IS-IS PDUs sent on this interface.
Level-1 Auth-mode	One of the following authentication modes set for Level-1 on the router: None md5 cleartext
Level-2 Auth-mode	One of the following authentication modes set for Level-2 on the router: None md5 cleartext This parameter is not displayed for interfaces that are configured with a Point-to-Point circuit type. This is because separate Level-2 Hello messages are not sent on Point-to-Point interfaces. Consequently, "Hello Interval", "Hello Multiplier", and "Authentication" parameters should always be configured in the Level-1 mode for Point-to-Point interfaces.
Level-1 Metric	The default-metric value that the device inserts in IS-IS Level-1 PDUs for this interface.
Level-1 Priority	The priority of this IS to be elected as the Designated IS for Level-1 in this broadcast network.
Level-1 Hello Interval	The number of seconds the software waits between sending Level-1 hello PDUs to the IS at the other end of the circuit.
Level-1 Hello Multiplier	The number by which the software multiplies the hello interval to calculate the hold time set in Level-1 Hello PDUs sent on the circuit.
Level-1 Designated IS	The NET of the Level-1 Designated IS.
Level-1 DIS Changes	The number of times the NET of the Level-1 Designated IS has changed.
Level-2 Metric	The default-metric value that the device inserts in IS-IS Level-2 PDUs for this interface.
Level-2 Priority	The priority of this IS to be elected as the Designated IS for Level-2 in this broadcast network.
Level-2 Hello Interval	The number of seconds the software waits between sending Level-2 Hello messages to the IS at the other end of the circuit.
Level-2 Hello Multiplier	The number by which the software multiplies the hello interval to calculate the hold time set for Level-2 Hello PDUs sent on this circuit. This parameter is not displayed for interfaces that are configured with a Point-to-Point circuit type. This is because separate Level-2 Hello messages are not sent on Point-to-Point interfaces. Consequently, "Hello Interval", "Hello Multiplier", and "Authentication" parameters should always be configured in the Level-1 mode for Point-to-Point interfaces.
Level-2 Designated IS	The NET of the Level-2 Designated IS.
Level-2 DIS Changes	The number of times the NET of the Level-2 Designated IS has changed.
Next IS-IS LAN Level-1 Hello	Number of seconds before next Level-1 Hello PDU will be transmitted by the device.
Next IS-IS LAN Level-2 Hello	Number of seconds before next Level-2 Hello PDU will be transmitted by the device.
Number of active Level-1 adjacencies	The number of ISs with which this interface has an active Level-1 adjacency.
Number of active Level-2 adjacencies	The number of ISs with which this interface has an active Level-2 adjacency.
Circuit State Changes	The number of times the state of the circuit has changed.
Circuit State Adjacencies Changes	The number of times an adjacency has started or ended on this circuit.
Rejected Adjacencies	The number of adjacency attempts by other ISs rejected by the device.
Circuit Authentication L1 failures	The number of times the device rejected a circuit because the authentication did not match the authentication configured for Level 1 on the device.
Circuit Authentication L2 failures	The number of times the device rejected a circuit because the authentication did not match the authentication configured for Level 2 on the device. This parameter is not displayed for interfaces that are configured with a Point-to-Point circuit type. This is because separate Level-2 Hello messages are not sent on Point-to-Point interfaces. Consequently, "Hello Interval", "Hello Multiplier", and "Authentication" parameters should always be configured in the Level-1 mode for Point-to-Point interfaces.
Bad LSP	The number of times the interface received a bad LSP from an IS at the other end of the circuit. The following conditions can cause an LSP to be bad: Invalid checksum Invalid length Invalid lifetime value
Control Messages Sent	The number of IS-IS control PDUs sent on this interface.
Control Messages Received	The number of IS-IS control PDUs received on this interface.
Hello Padding:	The Hello Padding configuration, which can be: Enabled Disabled
IP Enabled	If set to TRUE, the IP protocol is enabled for this circuit.
IP Address and Subnet Mask	The IP address and subnet mask for this interface.
IPv6 Enabled	If set to TRUE, the IPv6 protocol is enabled for this circuit.
IPv6 Address and Subnet Mask	The IPv6 address and subnet mask for this interface.
Ipv6 Link-Local Addresses	The IPv6 link local address for this interface.
MPLS TE Enabled:	If set to TRUE, MPLS Traffic Engineering protocol is enabled for this circuit.
BFD Enabled:	If set to TRUE, BiDirectional Forwarding Detection is enabled for this circuit.

Examples

The following example displays information about IS-IS interfaces for a device.

device# show isis interface
Total number of IS-IS Interfaces: 11

Interface: Ve 301
   Circuit State: UP Circuit Mode: Level 1-2
   Circuit Type: BCAST Passive State: FALSE
   Circuit Number: 2, MTU: 1500
   Level-1 Auth-mode: NONE
   Level-2 Auth-mode: NONE
   Level-1 Metric: 10, Level-1 Priority: 64
   Level-1 Hello Interval: 10, Level-1 Hello Multiplier: 3
   Level-1 Designated IS: R1-02 Level-1 DIS Changes: 2
   Level-2 Metric: 10, Level-2 Priority: 64
   Level-2 Hello Interval: 10, Level-2 Hello Multiplier: 3
   Level-2 Designated IS: R1-02 Level-2 DIS Changes: 2
   Next IS-IS LAN Level-2 Hello in 11 seconds
   Number of active Level-2 adjacencies: 0
   Next IS-IS LAN Level-1 Hello in 1 seconds
   Number of active Level-1 adjacencies: 0
   Circuit State Changes: 1 Circuit Adjacencies State Changes: 0
   Rejected Adjacencies: 0
   Circuit Authentication L1 failures: 0
   Circuit Authentication L2 failures: 0
   Bad LSPs: 0
   Control Messages Sent: 7577 Control Messages Received: 0
   Hello Padding: Enabled
   IP Enabled: TRUE
   IP Addresses:
     11.2.1.1/30
   IPv6 Enabled: FALSE
   MPLS TE Enabled: FALSE
   BFD Enabled: FALSE
   LDP-SYNC: Disabled, State:

Interface: Ve 302
   Circuit State: UP Circuit Mode: Level 1-2
   Circuit Type: BCAST Passive State: FALSE
   Circuit Number: 3, MTU: 1500
   Level-1 Auth-mode: NONE
   Level-2 Auth-mode: NONE
   Level-1 Metric: 10, Level-1 Priority: 64
   Level-1 Hello Interval: 10, Level-1 Hello Multiplier: 3
   Level-1 Designated IS: R1-03 Level-1 DIS Changes: 2
   Level-2 Metric: 10, Level-2 Priority: 64
   Level-2 Hello Interval: 10, Level-2 Hello Multiplier: 3
   Level-2 Designated IS: R1-03 Level-2 DIS Changes: 2
   Next IS-IS LAN Level-2 Hello in 2 seconds
   Number of active Level-2 adjacencies: 0
   Next IS-IS LAN Level-1 Hello in 4 seconds
   Number of active Level-1 adjacencies: 0
   Circuit State Changes: 1 Circuit Adjacencies State Changes: 0
   Rejected Adjacencies: 0
   Circuit Authentication L1 failures: 0
   Circuit Authentication L2 failures: 0
   Bad LSPs: 0
   Control Messages Sent: 7600 Control Messages Received: 0
   Hello Padding: Enabled
   IP Enabled: TRUE
   IP Addresses:
     11.2.1.5/30
   IPv6 Enabled: FALSE
   MPLS TE Enabled: FALSE
   BFD Enabled: FALSE
   LDP-SYNC: Disabled, State:
…

The following example displays summarized information about IS-IS interfaces for a device.

device# show isis interface brief

Total number of IS-IS Interfaces: 11
Interface       Type  State Mode Passive MTU  UpAdj DIS  StateChg  AdjStateChg
Ve 301          BCAST UP    L12  FALSE   1500 0     None 1         0
Ve 302          BCAST UP    L12  FALSE   1500 0     None 1         0
Ve 303          BCAST UP    L12  FALSE   1500 0     None 1         0
Ve 304          BCAST UP    L12  FALSE   1500 0     None 1         0
Ve 305          BCAST UP    L12  FALSE   1500 0     None 1         0
Ve 306          BCAST UP    L12  FALSE   1500 0     None 1         0
Ve 307          BCAST UP    L12  FALSE   1500 0     None 1         0
Ve 308          BCAST UP    L12  FALSE   1500 0     None 1         0
Ve 309          BCAST UP    L12  FALSE   1500 0     None 1         0
Ve 310          BCAST UP    L12  FALSE   1500 0     None 1         0
Lo 1            BCAST UP    L12  TRUE    0    0     None 1         0