Cisco Nexus 1010 Command Reference, Release 4.2(1)SP1(2)
T Commands
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Table of Contents

T Commands

t acacs+ enable

tacacs-server deadtime

tacacs-server directed-request

tacacs-server host

tacacs-server key

tacacs-server timeout

tail

telnet

telnet server enable

terminal event-manager bypass

terminal length

terminal monitor

terminal session-timeout

terminal terminal-type

terminal tree-update

terminal width

traceroute

T Commands

This chapter describes the Cisco Nexus 1010 commands that begin with the letter T.

tacacs+ enable

To enable TACACS+, use the tacacs+ enable command. To disable TACACS+, use the no form of this command.

tacacs+ enable

no tacacs+ enable

 
Syntax Description

This command has no arguments or keywords.

 
Defaults

None

 
Command Modes

Global configuration (config)

 
Supported User Roles

network-admin

 
Command History

Release
Modification

4.0(4)SP1(1)

This command was introduced.

Examples

This example shows how to enable TACACS+:

switch(config)# tacacs+ enable
switch(config)#
 

This example shows how to disable TACACS+:

switch(config)# no tacacs+ enable
switch(config)#

 
Related Commands

Command
Description

tacacs-server key

Designates the global key shared between the Cisco Nexus 1000V and the TACACS+ server hosts.

tacacs-server host

Designates the key shared between the Cisco Nexus 1000V and this specific TACACS+ server host.

show tacacs-server

Displays the TACACS+ server configuration.

tacacs-server deadtime

To set a periodic time interval where a nonreachable (nonresponsive) TACACS+ server is monitored for responsiveness, use the tacacs-server deadtime command. To disable the monitoring of the nonresponsive TACACS+ server, use the no form of this command.

tacacs -server deadtime minutes

no tacacs -server deadtime minutes

 
Syntax Description

time

Time interval in minutes. The range is from 1 to 1440.

 
Defaults

0 minutes

 
Command Modes

Global configuration (config)

 
Supported User Roles

network-admin

 
Command History

Release
Modification

4.0(4)SP1(1)

This command was introduced.

 
Usage Guidelines

Setting the time interval to zero disables the timer. If the dead-time interval for an individual TACACS+ server is greater than zero (0), that value takes precedence over the value set for the server group.

When the dead-time interval is 0 minutes, TACACS+ server monitoring is not performed unless the TACACS+ server is part of a server group and the dead-time interval for the group is greater than 0 minutes.

In global configuration mode, you must first enable the TACACS+ feature, using the tacacs+ enable command, before you can use any of the other TACACS+ commands to configure the feature.

Examples

This example shows how to configure the dead-time interval and enable periodic monitoring:

switch# config terminal
switch(config)# tacacs-server deadtime 10
 

This example shows how to revert to the default dead-time interval and disable periodic monitoring:

switch# config terminal
switch(config)# no tacacs-server deadtime 10
 

 
Related Commands

Command
Description

deadtime

Sets a dead-time interval for monitoring a nonresponsive TACACS+ server.

show tacacs-server

Displays TACACS+ server information.

tacacs+ enable

Enables TACACS+.

tacacs-server directed-request

To allow users to send authentication requests to a specific TACACS+ server when logging in, use the tacacs-server directed request command. To revert to the default, use the no form of this command.

tacacs -server directed-request

no tacacs -server directed-request

 
Syntax Description

This command has no arguments or keywords.

 
Defaults

Disabled

 
Command Modes

Global configuration (config)

 
Supported User Roles

network-admin

 
Command History

Release
Modification

4.0(4)SP1(1)

This command was introduced.

 
Usage Guidelines

In global configuration mode, you must first enable the TACACS+ feature, using the tacacs+ enable command, before you can use any of the other TACACS+ commands to configure the feature.

The user can specify the username@vrfname : hostname during login, where vrfname is the virtual routing and forwarding (VRF) name to use and hostname is the name of a configured TACACS+ server. The username is sent to the server name for authentication.

Examples

This example shows how to allow users to send authentication requests to a specific TACACS+ server when logging in:

switch# config t
switch(config)# tacacs-server directed-request
 

This example shows how to disallow users to send authentication requests to a specific TACACS+ server when logging in:

switch# config t
switch(config)# no tacacs-server directed-request
 

 
Related Commands

Command
Description

show tacacs-server

Displays the TACACS+ server configuration.

tacacs+ enable

Enables TACACS+.

tacacs-server host

To configure TACACS+ server host parameters, use the tacacs-server host command in configuration mode. To revert to the defaults, use the no form of this command.

tacacs-server host { hostname | ipv4-address | ipv6-address }
[
key [ 0 | 7 ] shared-secret ] [ port port-number ]
[
test { idle-time time | password password | username name }]
[
timeout seconds ]

no tacacs-server host { hostname | ipv4-address | ipv6-address }
[ key [ 0 | 7 ] shared-secret ] [ port port-number ]
[
test { idle-time time | password password | username name }]
[
timeout seconds ]

 
Syntax Description

hostname

TACACS+ server Domain Name Server (DNS) name. The name is alphanumeric, case sensitive, and has a maximum of 256 characters.

ipv4-address

TACACS+ server IPv4 address in the A.B.C.D format.

ipv6-address

TACACS+ server IPv6 address in the X : X : X :: X format.

key

(Optional) Configures the TACACS+ server’s shared secret key.

0

(Optional) Configures a preshared key specified in clear text (indicated by 0) to authenticate communication between the TACACS+ client and server. This is the default.

7

(Optional) Configures a preshared key specified in encrypted text (indicated by 7) to authenticate communication between the TACACS+ client and server.

shared-secret

Preshared key to authenticate communication between the TACACS+ client and server. The preshared key is alphanumeric, case sensitive, and has a maximum of 63 characters.

port port-number

(Optional) Configures a TACACS+ server port for authentication. The range is from 1 to 65535.

test

(Optional) Configures parameters to send test packets to the TACACS+ server.

idle-time time

(Optional) Specifies the time interval (in minutes) for monitoring the server. The time range is 1 to 1440 minutes.

password password

(Optional) Specifies a user password in the test packets. The password is alphanumeric, case sensitive, and has a maximum of 32 characters.

username name

(Optional) Specifies a username in the test packets. The username is alphanumeric, case sensitive, and has a maximum of 32 characters.

timeout seconds

(Optional) Configures a TACACS+ server timeout period (in seconds) between retransmissions to the TACACS+ server. The range is from 1 to 60 seconds.

 
Defaults

Parameter
Default

Idle-time

disabled

Server monitoring

disabled

Timeout

1 seconds

Test username

test

Test password

test

 
Command Modes

Global configuration (config)

 
Supported User Roles

network-admin

 
Command History

Release
Modification

4.0(4)SP1(1)

This command was introduced.

 
Usage Guidelines

You must use the tacacs+ enable command before you configure TACACS+.

When the idle time interval is 0 minutes, periodic TACACS+ server monitoring is not performed.

Examples

This example shows how to configure TACACS+ server host parameters:

switch# config terminal
switch(config)# tacacs-server host 10.10.2.3 key HostKey
switch(config)# tacacs-server host tacacs2 key 0 abcd
switch(config)# tacacs-server host tacacs3 key 7 1234
switch(config)# tacacs-server host 10.10.2.3 test idle-time 10
switch(config)# tacacs-server host 10.10.2.3 test username tester
switch(config)# tacacs-server host 10.10.2.3 test password 2B9ka5
 

 
Related Commands

Command
Description

show tacacs-server

Displays TACACS+ server information.

tacacs+ enable

Enables TACACS+.

tacacs-server key

To configure a global TACACS+ shared secret key, use the tacacs-server key command. To remove a configured shared secret, use the no form of this command.

tacacs-server key [ 0 | 7 ] shared-secret

no tacacs-server key [ 0 | 7 ] shared-secret

 
Syntax Description

0

(Optional) Configures a preshared key specified in clear text to authenticate communication between the TACACS+ client and server. This is the default.

7

(Optional) Configures a preshared key specified in encrypted text to authenticate communication between the TACACS+ client and server.

shared-secret

Preshared key to authenticate communication between the TACACS+ client and server. The preshared key is alphanumeric, case sensitive, and has a maximum of 63 characters.

 
Defaults

None

 
Command Modes

Global configuration (config)

 
Supported User Roles

network-admin

 
Command History

Release
Modification

4.0(4)SP1(1)

This command was introduced.

 
Usage Guidelines

You must configure the TACACS+ preshared key to authenticate the device on the TACACS+ server. The length of the key is restricted to 63 characters and can include any printable ASCII characters (white spaces are not allowed). You can configure a global key to be used for all TACACS+ server configurations on the device. You can override this global key assignment by using the key keyword in the tacacs-server host command.

You must use the tacacs+ enable command before you configure TACACS+.

Examples

This example shows how to configure TACACS+ server shared keys:

switch# config terminal
switch(config)# tacacs-server key AnyWord
switch(config)# tacacs-server key 0 AnyWord
switch(config)# tacacs-server key 7 public
 

 
Related Commands

Command
Description

show tacacs-server

Displays TACACS+ server information.

tacacs+ enable

Enables TACACS+.

tacacs-server timeout

To specify the time between retransmissions to the TACACS+ servers, use the tacacs-server timeout command. To revert to the default, use the no form of this command.

tacacs-server timeout seconds

no tacacs-server timeout seconds

 
Syntax Description

seconds

Seconds between retransmissions to the TACACS+ server. The range is from 1 to 60 seconds.

 
Defaults

5 seconds

 
Command Modes

Global configuration (config)

 
Supported User Roles

network-admin

 
Command History

Release
Modification

4.0(4)SP1(1)

This command was introduced.

 
Usage Guidelines

You must use the tacacs+ enable command before you configure TACACS+.

Examples

This example shows how to configure the TACACS+ server timeout value:

switch# config terminal
switch(config)# tacacs-server timeout 3
 

This example shows how to revert to the default TACACS+ server timeout value:

switch# config terminal
switch(config)# no tacacs-server timeout 3
 

 
Related Commands

Command
Description

show tacacs-server

Displays TACACS+ server information.

tacacs+ enable

Enables TACACS+.

tail

To display the last lines of a file, use the tail command.

tail [ filesystem : [ // module / ]][ directory / ] filename lines ]

 
Syntax Description

filesystem :

(Optional) Name of a file system. The name is case sensitive.

// module /

(Optional) Identifier for a supervisor module. Valid values are sup-active , sup-local , sup-remote , or sup-standby . The identifiers are case sensitive.

directory /

(Optional) Name of a directory. The name is case sensitive.

filename

Name of the command file. The name is case sensitive.

lines

(Optional) Number of lines to display. The range is from 0 to 80.

 
Defaults

10 lines

 
Command Modes

Any command mode

 
Supported User Roles

network-admin

 
Command History

Release
Modification

4.0(4)SP1(1)

This command was introduced.

 
Usage Guidelines

Examples

This example shows how to display the last 10 lines of a file:

switch# tail bootflash:startup.cfg
ip arp inspection filter marp vlan 9
ip dhcp snooping vlan 13
ip arp inspection vlan 13
ip dhcp snooping
ip arp inspection validate src-mac dst-mac ip
ip source binding 10.3.2.2 0f00.60b3.2333 vlan 13 interface Ethernet2/46
ip source binding 10.2.2.2 0060.3454.4555 vlan 100 interface Ethernet2/10
logging level dhcp_snoop 6
logging level eth_port_channel 6
 

This example shows how to display the last 20 lines of a file:

switch# tail bootflash:startup.cfg 20
area 99 virtual-link 1.2.3.4
router rip Enterprise
router rip foo
address-family ipv4 unicast
router bgp 33.33
event manager applet sdtest
monitor session 1
monitor session 2
ip dhcp snooping vlan 1
ip arp inspection vlan 1
ip arp inspection filter marp vlan 9
ip dhcp snooping vlan 13
ip arp inspection vlan 13
ip dhcp snooping
ip arp inspection validate src-mac dst-mac ip
ip source binding 10.3.2.2 0f00.60b3.2333 vlan 13 interface Ethernet2/46
ip source binding 10.2.2.2 0060.3454.4555 vlan 100 interface Ethernet2/10
logging level dhcp_snoop 6
logging level eth_port_channel 6
 

 
Related Commands

Command
Description

cd

Changes the current working directory.

copy

Copies files.

dir

Displays the directory contents.

pwd

Displays the name of the current working directory.

telnet

To create a Telnet session, use the telnet command.

telnet { ipv4-address | hostname } [ port-number ] [ vrf vrf-name ]

 
Syntax Description

ipv4-address

IPv4 address of the remote device.

hostname

Hostname of the remote device. The name is alphanumeric, case sensitive, and has a maximum of 64 characters.

port-number

(Optional) Port number for the Telnet session. The range is from 1 to 65535.

vrf vrf-name

(Optional) Specifies the virtual routing and forwarding (VRF) name to use for the Telnet session. The name is case sensitive.

 
Defaults

Port 23

Default VRF

 
Command Modes

Any command mode

 
Supported User Roles

network-admin

 
Command History

Release
Modification

4.0(4)SP1(1)

This command was introduced.

 
Usage Guidelines

To use this command, you must enable the Telnet server using the telnet server enable command.

Examples

This example shows how to start a Telnet session using an IPv4 address:

switch# telnet 10.10.1.1 vrf management
 

 
Related Commands

Command
Description

clear line

Clears Telnet sessions.

telnet server enable

Enables the Telnet server.

telnet server enable

To enable the Telnet server, use the telnet server enable command. To disable the Telnet server, use the no form of this command.

telnet server enable

no telnet server enable

 
Syntax Description

This command has no arguments or keywords.

 
Defaults

Enabled

 
Command Modes

Global configuration (config)

 
Supported User Roles

network-admin

 
Command History

Release
Modification

4.0(4)SP1(1)

This command was introduced.

Examples

This example shows how to enable the Telnet server:

switch# config t
switch(config)# telnet server enable
 

This example shows how to disable the Telnet server:

switch# config t
switch(config)# no telnet server enable
XML interface to system may become unavailable since ssh is disabled
 

 
Related Commands

Command
Description

show telnet server

Displays the Telnet server configuration.

telnet

Creates a Telnet session.

terminal event-manager bypass

To bypass the CLI event manager, use the terminal event-manager bypass command.

terminal event-manager byp ass

 
Syntax Description

This command has no arguments or keywords.

 
Defaults

Event manager is enabled.

 
Command Modes

Any command mode

 
Supported User Roles

network-admin
network-operator

 
Syntax Description

Release
Modification

4.0(4)SP1(1)

This command was introduced.

Examples

This example shows how to disable the CLI event manager:

switch# terminal event-manager bypass
switch#

 
Related Commands

Command
Description

show terminal

Displays terminal configuration.

terminal length

To set the number of lines that appear on the screen, use the terminal length command.

terminal length number

 
Syntax Description

number

Number of lines. The range is from 0 to 511.

 
Defaults

28 lines

 
Command Modes

Any command mode

 
Supported User Roles

network-admin
network-operator

 
Command History

Release
Modification

4.0(4)SP1(1)

This command was introduced.

 
Usage Guidelines

Set number to 0 to disable pausing.

Examples

This example shows how to set the number of lines that appear on the screen:

switch# terminal length 60
switch#

 
Related Commands

Command
Description

show terminal

Displays the terminal configuration.

terminal monitor

To enable logging for Telnet or Secure Shell (SSH), use the terminal monitor command.

terminal monitor

 
Syntax Description

This command has no arguments or keywords.

 
Defaults

None

 
Command Modes

Any command mode

 
Supported User Roles

network-admin

 
Command History

Release
Modification

4.0(4)SP1(1)

This command was introduced.

Examples

This example shows how to enable logging for Telnet or SSH:

switch# terminal monitor
switch#

 
Related Commands

Command
Description

show terminal

Displays the terminal configuration.

terminal length

Sets the number of lines that appear on the screen.

terminal width

Sets the terminal width.

terminal terminal-type

Specifies the terminal type.

terminal session-timeout

Sets the session timeout.

terminal session-timeout

To set a session timeout, use the terminal session-timeout command.

terminal session-timeout time

 
Syntax Description

time

Timeout time, in seconds. The range is from 0 to 525600.

 
Defaults

None

 
Command Modes

Any command mode

 
Supported User Roles

network-admin
network-operator

 
Command History

Release
Modification

4.0(4)SP1(1)

This command was introduced.

 
Usage Guidelines

Set time to 0 to disable timeout.

Examples

This example shows how to set a session timeout:

switch# terminal session-timeout 100
switch#

 
Related Commands

Command
Description

show terminal

Displays the terminal configuration.

terminal terminal-type

To specify the terminal type, use the terminal terminal-type command.

terminal terminal-type type

 
Syntax Description

type

Terminal type.

 
Defaults

None

 
Command Modes

Any command mode

 
Supported User Roles

network-admin
network-operator

 
Command History

Release
Modification

4.0(4)SP1(1)

This command was introduced.

Examples

This example shows how to specify the terminal type:

switch# terminal terminal-type vt100
switch#

 
Related Commands

Command
Description

show terminal

Displays the terminal configuration.

terminal tree-update

To update the main parse tree, use the terminal tree-update command.

terminal tree-update

 
Syntax Description

This command has no arguments or keywords.

 
Defaults

None

 
Command Modes

Any command mode

 
Supported User Roles

network-admin
network-operator

 
Command History

Release
Modification

4.0(4)SP1(1)

This command was introduced.

Examples

This example shows how to update the main parse tree:

switch# terminal tree-update
switch#

 
Related Commands

Command
Description

show terminal

Displays the terminal configuration.

terminal width

To set the terminal width, use the terminal width command.

terminal width number

 
Syntax Description

number

Number of characters on a single line. The range is from 24 to 511.

 
Defaults

102 columns

 
Command Modes

Any command mode

 
Supported User Roles

network-admin
network-operator

 
Command History

Release
Modification

4.0(4)SP1(1)

This command was introduced.

Examples

This example shows how to set the terminal width:

switch# terminal width 60
switch#

 
Related Commands

Command
Description

show terminal

Displays the terminal configuration.

traceroute

To discover the routes that packets take when traveling to an IPv4 address, use the traceroute command.

traceroute { dest-ipv4-addr | hostname } [ vrf vrf-name ] [ show-mpls-hops ] [ source src-ipv4-addr ]

 
Syntax Description

dest-ipv4-addr

IPv4 address of the destination device. The format is A . B . C . D .

hostname

Name of the destination device. The name is case sensitive.

vrf vrf-name

(Optional) Specifies the virtual routing and forwarding (VRF) to use. The name is case sensitive.

show-mpls-hops

(Optional) Displays the Multiprotocol Label Switching (MPLS) hops.

source src-ipv4-addr

(Optional) Specifies a source IPv4 address. The format is A . B . C . D .

 
Defaults

Uses the default VRF.
Does not show the MPLS hops.
Uses the management IPv4 address for the source address.

 
Command Modes

Any command mode

 
Supported User Roles

network-admin

 
Command History

Release
Modification

4.0(4)SP1(1)

This command was introduced.

 
Usage Guidelines

To use IPv6 addressing for discovering the route to a device, use the traceroute6 command.

Examples

This example shows how to discover a route to a device:

switch# traceroute 172.28.255.18 vrf management
traceroute to 172.28.255.18 (172.28.255.18), 30 hops max, 40 byte packets
1 172.28.230.1 (172.28.230.1) 0.746 ms 0.595 ms 0.479 ms
2 172.24.114.213 (172.24.114.213) 0.592 ms 0.51 ms 0.486 ms
3 172.20.147.50 (172.20.147.50) 0.701 ms 0.58 ms 0.486 ms
4 172.28.255.18 (172.28.255.18) 0.495 ms 0.43 ms 0.482 ms
 

 
Related Commands

Command
Description

ping

Determines the network connectivity to another device using IPv4 addressing