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cssh

Tool to connect to (recent) Cisco switches and accesspoints and execute commands.

Tested on:

  • Cisco Nexus devices (n2k/n5k/n7k/n9k)
  • A lot of Cisco Catalyst types (2960, 3750, ..)
  • A lot of Cisco Aironet APs

use cases

  • configure a lot of devices easy and at the same time
  • get realtime output from a specified list of switches (e.g searching a mac address)
  • run simple commands without an interactive shell

building

Make sure you have Go properly installed, including setting up your GOPATH

Next, run

$ cd $GOPATH
$ go get github.com/42wim/cssh

You'll have the binary 'cssh' in $GOPATH/bin

usage

$ ./cssh
  -cmd="": single command to execute
  -cmd-from="": file containing commands to execute
  -host="": host
  -host-from="": file containing hosts
  -logdir="": directory to log output
  -pipe=false: pipe to stdin

config

cssh looks for cssh.conf in current directory.
This config file is necessary because it contains the credentials.

Format is

[device "yourswitch"] #yourswitch can be a FQDN or an IP or an regular expression
username=admin 
password=abc
enable=abc

E.g.

[device "switch-building-x-*"]
username=admin
password=abc
enable=abc

Also see cssh.conf.dist

examples

using -pipe

$ echo "sh version"| cssh -host lab-switch-1 -pipe|grep uptime
lab-switch-1 uptime is 20 weeks, 4 days, 9 hours, 19 minutes

using -logdir

$ mkdir logs
$ cssh -host lab-switch-1 -cmd "sh tech" -logdir logs
$ ls -b logs/
201503242329-lab-switch-1

interactive commands

Use the '!' separator

$ cssh -cmd 'ping!ip!4.4.4.4!5!100!2!n!n' -host lab-switch-1
Protocol [ip]: ip
Target IP address: 4.4.4.4
Repeat count [5]: 5
Datagram size [100]: 100
Timeout in seconds [2]: 2
Extended commands [n]: n
Sweep range of sizes [n]: n
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 4.4.4.4, timeout is 2 seconds:
.....
Success rate is 0 percent (0/5)
lab-switch-1#

$ cssh -cmd 'copy run start!' -host lab-switch-1
copy run start
Destination filename [startup-config]?
Building configuration...
[OK]
lab-switch-1#

1 host and 1 command

$ cssh -host lab-switch-1 -cmd "sh clock"
sh clock
23:41:27.572 CET Wed Mar 11 2015
lab-switch-1#

1 host and multiple commands

see examples/cmd-configexample for the contents

$ cssh -host lab-switch-1 -cmd-from cmd-configexample
conf t
Enter configuration commands, one per line.  End with CNTL/Z.
lab-switch-1(config)#interface GigabitEthernet0/2
lab-switch-1(config-if)#switchport trunk allowed vlan 234,336,337,356,445,488
lab-switch-1(config-if)#switchport mode trunk
lab-switch-1(config-if)#switchport nonegotiate
lab-switch-1(config-if)#switchport protected
lab-switch-1(config-if)#storm-control broadcast level 50.00 30.00
lab-switch-1(config-if)#storm-control action trap
lab-switch-1(config-if)#no cdp enable
lab-switch-1(config-if)#spanning-tree portfast
lab-switch-1(config-if)#spanning-tree bpduguard enable
lab-switch-1(config-if)#ip dhcp snooping limit rate 30
lab-switch-1(config-if)#exit
lab-switch-1(config)#exit
lab-switch-1#

multiple hosts and 1 command

labswitches contains

lab-switch-1
lab-switch-2

$ cssh -host-from labswitches -cmd "sh clock"
sh clock
*22:45:16.946 UTC Wed Mar 11 2015
lab-switch-1#
sh clock
23:45:18.604 CET Wed Mar 11 2015
lab-switch-2#

multiple hosts and multiple commands

left as an exercise for the reader