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• Crypto Key Generate Cisco Switch
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• Configuring key lengths: The crypto key generate ssh command allows you to specify the type and length of the generated host key. The size of the host key is platform-dependent as different switches have different amounts of processing power. The size is represented by the parameter and has the values shown in.The default value is used if keysize is not specified.
• Run show crypto key mypubkey rsa to see if you do, in fact, have a key fully generated and registered under a non-default name. If there is, then you can tell the ssh process to use this key with ip ssh rsa keypair-name xxx. If the first command doesn't show anything useful then I'd say you can go ahead and generate a new key.

Use a terminal application such as HyperTerminal to display the switch public key with the show crypto host public-key command, see Example of generating a public/private host key pair for the switch. Bring up the SSH client's 'known host' file in a text editor such as Notepad as straight ASCII text, and copy the switch public key into the file. Config t crypto key generate rsa exit Then ssh to the router and complete the config. Or just enable telnet if you can get away with it. Config t vty 0 4 transport input ssh telnet exit I have a perl script that does this to reset enable passwords.

Q: I have a Cisco switch in my network, which I can access by hooking up a console cable directly to the device. I like to access the switch remotely using SSH. How can I enable ssh on my Cisco 3750 Catalyst Switch?
A: By default, when you configure a Cisco device, you have to use the console cable and connect directly to the system to access it. Follow the steps mentioned below, which will enable SSH access to your Cisco devices. Once you enable SSH, you can access it remotely using PuTTY or any other SSH client.

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1. Setup Management IP

First, make sure you have performed basic network configurations on your switch. For example, assign default gateway, assign management ip-address, etc. If this is already done, skip to the next step.

In the following example, the management ip address is set as 192.168.101.2 in the 101 VLAN. The default gateway points to the firewall, which is 192.168.101.1

2. Set hostname and domain-name

Next, make sure the switch has a hostname and domain-name set properly.

3. Generate the RSA Keys

The switch or router should have RSA keys that it will use during the SSH process. So, generate these using crypto command as shown below.

Also, if you are running on an older Cisco IOS image, it is highly recommended that you upgrade to latest Cisco IOS.

4. Setup the Line VTY configurations

Setup the following line vty configuration parameters, where input transport is set to SSH. Set the login to local, and password to 7.

If you have not set the console line yet, set it to the following values.

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5. Create the username password

If you don’t have an username created already, do it as shown below.

Note: If you don’t have the enable password setup properly, do it now.

Make sure the password-encryption service is turned-on, which will encrypt the password, and when you do “sh run”, you’ll seee only the encrypted password and not clear-text password.

Crypto Key Generate On Switch Iphone

5. Verify SSH access

From the switch, if you do ‘sh ip ssh’, it will confirm that the SSH is enabled on this cisco device.

After the above configurations, login from a remote machine to verify that you can ssh to this cisco switch.

In this example, 192.168.101.2 is the management ip-address of the switch.

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Crypto Key Generate Cisco Switch

This How-To guide will walk you through setting up (configuring and enabling) SSH on a HP ProCurve Switch using the Web Interface.
It assumes you can access the switch via the web interface and have read-write access.
This walkthrough does NOT implement Client Public Key Authentication and has the Switch Authenticate against itself.

4 Steps total

Step 1: Log into the Switch

Log into the switch's Web interface using an account with read-write permissions.

Step 2: Create a Certificate

Note: This step will create a self-signed certificate but you can also create a request and have your Enterprise CA sign it if your environment has it available.

On the Security Tab, Select Create Certificate/ Create Request.
Select Self-Signed from the drop down box and fill in the appropriate fields.
be sure the Validity start and end dates are current.

Click Apply Changes to create the certificate.

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Step 3: Generate a Private/Public Key pair

Navigate over to the Configuration Tab
Click on 'telnet session to the switch console.' - This will open a black command prompt looking window.
Press any key to continue
Type in your username
Type in your password
Type in 'config' (This is the step it is left out of most other directions)
Type in 'crypto key generate ssh'
The switch will now generate a key.
If this step fails, verify your are in 'config'mode

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Step 4: Enable SSH

Now that you have created a certificate and the appropriate keys, you can enable SSH on the switch.

Type in 'ip ssh' in the Telnet CLI.
Thats it. SSH should now be enabled.

You can verify its enabled by typing in 'show ip ssh'

After following these instructions, you should have been sucessfully able to configure and enable SSH on your HP ProCurve Switch. The steps and screenshot in this How-To were completed using the latest Firmware for that switch 'N.11.48'.
You should now be able to have Spiceworks scan your switches using SSH which will allow spiceworks to monitor and backup their configuration.

References

• HP Access Security Guide

5 Comments

• Poblano
  TeBear Dec 10, 2013 at 04:24pm

  I found there is no need for Step 1 or Step 2

  Telnet into switch and run following commands:

  >enable
  >config
  >crypto key generate ssh

  Seems to do the trick. looks like ssh is enabled out of the box (Step 4) on Procurve though you need to generate the key to be able to use it.

• Serrano
  BoJlk Jan 6, 2014 at 07:49am

  Thanks for the steps.
  you must crypto key generate ssh in config mode before enabling SSH on your switch.
  Step 2 - Create a Certificate helpfull if you want to access with HTTPS to your switch.

• Serrano
  Felix_da_CAT5 May 16, 2014 at 08:03am

  isnt it necessary to save the configuration after any alteration in order to keep working after a reboot?

• Cayenne
  Nathan Bareham Aug 2, 2014 at 07:22pm

  i can scan, but the config does not seem to be backing up. any ideas?

• Chipotle
  Dr-Drew Nov 25, 2015 at 10:00pm

  Always a good idea to 'write mem' when your done in the CLI.. :o)