Cisco Nexus 7000 Series NX-OS Configuration Examples, Release 5.x
Fundamentals Configuration Examples
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Fundamentals Configuration Examples

Fundamentals Configuration Examples

This chapter provides examples for configuring certain fundamental Cisco NX-OS features.

Defining Command Aliases

This example shows how to define command aliases:

cli alias name ethint interface ethernet 
cli alias name shintbr show interface brief 
cli alias name shintupbr shintbr | include up | include ethernet

This example shows how to use a command alias:

switch# configure terminal
switch(config)# ethint 2/3
switch(config-if)#

Using CLI Session Variables

You can reference a variable using the syntax $( variable-name ).

This example shows how to reference a user-defined CLI session variable:

switch# show interface $(testinterface)
Ethernet2/1 is down (Administratively down)
  Hardware is 10/100/1000 Ethernet, address is 0000.0000.0000 (bia 0019.076c.4dac)
  MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation ARPA
  auto-duplex, auto-speed
  Beacon is turned off
  Auto-Negotiation is turned on
  Input flow-control is off, output flow-control is off
  Auto-mdix is turned on
  Switchport monitor is off
  Last clearing of "show interface" counters never
  5 minute input rate 0 bytes/sec, 0 packets/sec
  5 minute output rate 0 bytes/sec, 0 packets/sec
  L3 in Switched:
    ucast: 0 pkts, 0 bytes - mcast: 0 pkts, 0 bytes
  L3 out Switched:
    ucast: 0 pkts, 0 bytes - mcast: 0 pkts, 0 bytes
  Rx
    0 input packets 0 unicast packets 0 multicast packets
    0 broadcast packets 0 jumbo packets 0 storm suppression packets
    0 bytes
  Tx
    0 output packets 0 multicast packets
    0 broadcast packets 0 jumbo packets
    0 bytes
    0 input error 0 short frame 0 watchdog
    0 no buffer 0 runt 0 CRC 0 ecc
    0 overrun  0 underrun 0 ignored 0 bad etype drop
    0 bad proto drop 0 if down drop 0 input with dribble
    0 input discard
    0 output error 0 collision 0 deferred
    0 late collision 0 lost carrier 0 no carrier
    0 babble
    0 Rx pause 0 Tx pause 0 reset

Using the System-Defined Timestamp Variable

This example uses $(TIMESTAMP) when redirecting show command output to a file:

switch# show running-config > rcfg.$(TIMESTAMP)
Preparing to copy....done
switch# dir
       12667     May 01 12:27:59 2008  rcfg.2008-05-01-12.27.59

Usage for bootflash://sup-local
8192 bytes used
20963328 bytes free
20971520 bytes total

Running a Command Script

This example displays the CLI commands specified in the script file:

switch# show file testfile
configure terminal
interface ethernet 2/1
no shutdown
end
show interface ethernet 2/1

This example displays the run-script command execution output:

switch# run-script testfile
`configure terminal` 
`interface ethernet 2/1` 
`no shutdown` 
`end` 
`show interface ethernet 2/1 ` 
Ethernet2/1 is down (Link not connected)
  Hardware is 10/100/1000 Ethernet, address is 0019.076c.4dac (bia 0019.076c.4dac)
  MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation ARPA
  Port mode is trunk
  auto-duplex, auto-speed
  Beacon is turned off
  Auto-Negotiation is turned on
  Input flow-control is off, output flow-control is off
  Auto-mdix is turned on
  Switchport monitor is off
  Last clearing of "show interface" counters 1d26.2uh
  5 minute input rate 0 bytes/sec, 0 packets/sec
  5 minute output rate 0 bytes/sec, 0 packets/sec
  Rx
    0 input packets 0 unicast packets 0 multicast packets
    0 broadcast packets 0 jumbo packets 0 storm suppression packets
    0 bytes
  Tx
    0 output packets 0 multicast packets
    0 broadcast packets 0 jumbo packets
    0 bytes
    0 input error 0 short frame 0 watchdog
    0 no buffer 0 runt 0 CRC 0 ecc
    0 overrun  0 underrun 0 ignored 0 bad etype drop
    0 bad proto drop 0 if down drop 0 input with dribble
    0 input discard
    0 output error 0 collision 0 deferred
    0 late collision 0 lost carrier 0 no carrier
    0 babble
    0 Rx pause 0 Tx pause 0 reset

Accessing Directories on Standby Supervisor Modules

This example shows how to list the files on the standby supervisor module:

switch# dir bootflash://sup-remote
   12198912     Aug 27 16:29:18 2003  m9500-sf1ek9-kickstart-mzg.1.3.0.39a.bin
    1864931     Apr 29 12:41:59 2003  dplug2
      12288     Apr 18 20:23:11 2003  lost+found/
   12097024     Nov 21 16:34:18 2003  m9500-sf1ek9-kickstart-mz.1.3.1.1.bin
   41574014     Nov 21 16:34:47 2003  m9500-sf1ek9-mz.1.3.1.1.bin 

Usage for bootflash://sup-remote
   67747169 bytes used
  116812447 bytes free
  184559616 bytes total

This example shows how to delete a file on the standby supervisor module:

switch# delete bootflash://sup-remote/aOldConfig.txt
            

Moving Files

This example shows how to move a file on an external flash device:

switch# move slot0:samplefile slot0:mystorage/samplefile
            

This example shows how to move a file in the default file system:

switch# move samplefile mystorage/samplefile
            

Copying Files

This example shows how to copy the file called samplefile from the root directory of the slot0: file system to the mystorage directory:

switch# copy slot0:samplefile slot0:mystorage/samplefile

This example shows how to copy a file from the current directory level:

switch# copy samplefile mystorage/samplefile

This example shows how to copy a file from the active supervisor module bootflash to the standby supervisor module bootflash:

switch# copy bootflash:system_image bootflash://sup-2/system_image
            

This example shows how to overwrite the contents of an existing configuration in NVRAM:

switch# copy nvram:snapshot-config nvram:startup-config
            
Warning: this command is going to overwrite your current startup-config: 
Do you wish to continue? {y/n} [y] y
            

You can also use the copy command to upload and download files from the slot0: or bootflash: file system to or from a FTP, TFTP, SFTP, or SCP server.

Displaying File Contents

This example displays the contents of a file on an external flash device:

switch# show file slot0:test
configure terminal 
interface ethernet 1/1 
no shutdown 
end 
show interface ethernet 1/1

This example displays the contents of a file residing in the current directory:

switch# show file myfile

Displaying File Checksums

This example shows how to display the checksum of a file:

switch# show file bootflash:trunks2.cfg cksum 
583547619

This example shows how to display the MD5 checksum of a file:

switch# show file bootflash:trunks2.cfg md5sum 
3b94707198aabefcf46459de10c9281c

Compressing and Uncompressing Files

This example shows how to compress a file:

switch# dir
    1525859     Jul 04 00:51:03 2003 Samplefile 
...
switch# gzip volatile:Samplefile
switch# dir
     266069     Jul 04 00:51:03 2003 Samplefile.gz 
...

This example shows how to uncompress a compressed file:

switch# dir
     266069     Jul 04 00:51:03 2003 Samplefile.gz 
... 
switch# gunzip samplefile
switch# dir
    1525859     Jul 04 00:51:03 2003 Samplefile 
...

Redirecting show Command Output

This example shows how to direct the output to a file on the bootflash: file system:

switch# show interface > bootflash:switch1-intf.cfg

This example shows how to direct the output to a file on external flash memory:

switch# show interface > slot0:switch-intf.cfg

This example shows how to direct the output to a file on a TFTP server:

switch# show interface > tftp://10.10.1.1/home/configs/switch-intf.cfg
Preparing to copy...done

This example directs the output of the show tech-support command to a file:

switch# show tech-support > Samplefile
Building Configuration ... 
switch# dir
    1525859     Jul 04 00:51:03 2003 Samplefile 
Usage for volatile://
    1527808 bytes used
   19443712 bytes free
   20971520 bytes total

Finding Files

This example shows how to find a file in the current default directory:

switch# find smm_shm.cfg
/usr/bin/find: ./lost+found: Permission denied 
./smm_shm.cfg 
./newer-fs/isan/etc/routing-sw/smm_shm.cfg 
./newer-fs/isan/etc/smm_shm.cfg

Copying Configuration Files

This example shows how to overwrite the contents of an existing configuration in NVRAM:

switch# copy nvram:snapshot-config nvram:startup-config
Warning: this command is going to overwrite your current startup-config.
Do you wish to continue? {y/n} [y] y

This example shows how to copy a running configuration to the bootflash: file system:

switch# copy system:running-config bootflash:my-config

Backing Up Configuration Files

This example shows how to create a snapshot of the startup configuration in a predefined location on the device (binary file):

switch# copy startup-config nvram:snapshot-config

This example shows how to back up the startup configuration to the bootflash: file system (ASCII file):

switch# copy startup-config bootflash:my-config

This example shows how to back up the startup configuration to the TFTP server (ASCII file):

switch# copy startup-config tftp://172.16.10.100/my-config

This example shows how to back up the running configuration to the bootflash: file system (ASCII file):

switch# copy running-config bootflash:my-config

Rolling Back to a Previous Configuration

To roll back your configuration to a snapshot copy of a previously saved configuration, you need to perform the following steps:


  1. Clear the current running image with the write erase command.

  2. Restart the device with the reload command.

  3. Copy the previously saved configuration file to the running configuration with the copy configuration_file running-configuration command.

  4. Copy the running configuration to the start-up configuration with the copy running-config startup-config command.