Aug 21, 2017  R3(config)# crypto key generate rsa The name for the keys will be: R3.ccnasecurity.com Choose the size of the key modulus in the range of 360 to 2048 for your General Purpose Keys. Choosing a key modulus greater than 512 may take a few minutes. How many bits in the modulus 512: 1024% Generating 1024 bit RSA keys, keys will be non-exportable. Mar 20, 2020 Generate an RSA crypto key using a modulus of 1024 bits. S1(config)# crypto key generate rsa modulus 1024 The name for the keys will be: S1.CCNA-Lab.com% The key modulus size is 1024 bits% Generating 1024 bit RSA keys, keys will be non-exportable.

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1. Nov 23, 2011% Generating 1024 bit RSA keys, keys will be non-exportable. OK (elapsed time was 3 seconds) This alone should make sure that the SSH is able to run in SSHv2.
2. Feb 12, 2018 When running the following commands to generate my keys: Router(config)#crypto key generate rsa I am getting the following output: How many bits in the modulus 512: 1024% Generating 1024 bit RSA keys, keys will be non-exportable.
3. Mar 20, 2020  Generate an RSA crypto key using a modulus of 1024 bits. S1(config)# crypto key generate rsa modulus 1024 The name for the keys will be: S1.CCNA-Lab.com% The key modulus size is 1024 bits% Generating 1024 bit RSA keys, keys will be non-exportable.

Step 1: Inspect your hardware

Check the model number of your shiny new switch. Or, if you are using a spare, check the device hardware and its connected cables for any damages. If everything checks out, power on the switch and verify that all the indicator lights are in working order. Next, use a rollover cable to console into the switch from your computer. To do this, you will need to download and install Putty (or a similar, fun-named software tool). Run Putty and select the 9600 speed serial connection. You are now connected to the switch and ready to check the output of the following commands:

• show version
• show running-config
• show VLAN brief
• show VTP status
  • (config)# IP domain-name routerfreak.com
  • (config)# hostname Switch01
  • (config)# interface VLAN1
  • (config)# description Management VLAN
  • (config)# IP address 192.168.101.1 255.255.255.0
  • vtp [client server transparent]
  • vtp domain name
  • description *** DESCRIPTION ***
  • switchport access vlan ###
  • sswitchport mode access
  • power inline consumption ###
  • queue-set 2
  • mls qos trust dscp
  • storm-control multicast level 50.00
  • no cdp enable
  • spanning-tree portfast
  • spanning-tree bpduguard enable
  • Interface GigabitEthernet1/0/1
  • description *** UPLINK ***
  • switchport trunk encapsulation dot1q
  • switchport mode trunk
  • speed 1000
  • duplex full
  • Switch01(config)# crypto key generate rsa
  • The name for the keys will be:
  • Switch01.routerfreak.com
  • How many bits in the modulus [512]: 1024
  • % Generating 1024 bit RSA keys, keys will be non-exportable..[OK]
  • # line vty 0 4
  • (config-line)# transport input ssh
  • (config-line)# login local
  • (config-line)# password routerfreak
  • (config-line)# exit
  • # line console 0
  • (config-line)# logging synchronous
  • (config-line)# login local
  • Switch01# service password-encryption
  • remote-computer# ssh 192.168.101.1
  • Log in as: username
  • Password:
  • Switch01>en
  • Password:
  • Switch01#

For spare switches, make sure to delete the flash:vlan.dat file to erase the previous configuration.

Step 2: Set up management IP

Unlike with that punny name you gave your home Wi-Fi network, when setting up the hostname for your switch you should probably stick to a more professional and standard naming convention. Follow any preset naming assignment your company is using and then assign an IP address on the management VLAN. Next, make sure your switch has a set hostname and domain name:

Step 3: Check VTP revision number

Hit the show vtp status command to reveal your Virtual Trunking Protocol (VTP) revision numbers. The VTP revision numbers determine which updates are to be used in a VTP domain. When you set a VTP domain name, the revision number is set to zero—after which each change to the VLAN database increases the revision number by one. Your switch will only process data from a neighboring switch coming from the same domain and if the revision number of the neighboring switch is higher than its own. This means that the switches will update their VLAN configuration based on the VTP information being sent by the switch with the highest revision number.

So, before you add your switch to the network, you’re going to want to set its revision number to zero. To easily reset the domain back to zero, change the config mode to transparent:

Step 4: Configure access ports

You might already have a template ready for access port configuration, but in case you don’t, here are some commands you should use:

Step 5: Configure trunk ports

Enter the command sh int g0/1 capabilities and check the trunking protocol supported. If ISL is supported, you have to issue the switchport trunk encapsulation dot1q on the trunk port configuration. If not, simply type switchport mode trunk. It means there is no other encapsulation supported so there is no need for an encapsulation command. It only supports 802.1Q.

Step 6: Configure access ports

After already performing basic network switch configurations, it’s time to generate RSA keys to be used during the SSH process, using the crypto commands shown here:

Choose the size of the key modulus in the range of 360 to 2048 for your General Purpose Keys. Choosing a key modulus greater than 512 may take a few minutes.

Step 7: Set up VTY line config

If you have not set the console line yet, you can easily input these values:

Set the enable password using the enable secret password command. Then, set the privilege exec password with username name privilege 15 secret password. Make sure that the password-encryption service is activated.

Verify SSH access by typing ‘sh ip ssh’ to confirm that the SSH is enabled. You can now try to log in from a remote machine to verify that you can ssh to your Cisco switch.

Finishing touches

You’ve made it through the learning process with (hopefully) minimum bumps and bruises, and you’re just about ready to ride off. All that’s left is to test your access, reload the switch, and ready the cables. Once that’s done, label your switch, rack it up, and go enjoy doing anything that doesn’t involve switch configuration!

• October 2, 2015
• Posted by: Syed Shujaat
• Category: Cisco, Networking Solutions

Use this command to generate RSA key pairs for your Cisco device (such as a router). keys are generated in pairs–one public RSA key and one private RSA key.

If your router already has RSA keys when you issue this command, you will be warned and prompted to replace the existing keys with new keys.

NOTE: Before issuing this command, ensure that your router has a hostname and IP domain name configured (with the hostname and ipdomain-name commands).

You will be unable to complete the cryptokeygeneratersacommand without a hostname and IP domain name. (This situation is not true when you generate only a named key pair.)

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Here are the steps to Enable SSH and Crypto Key setup : 2 config must requried for SSH

1 Setup Local VTY line User ID and password

router (Config) # Line VTY 0 15

router (Config-line)# login local

router (Config-line)# Exit

!!! create local login ID/Pass

router (Config)# username [loginid] password [cisco]

router (Config)# username loginid1 password cisco1

2. router (Config)# ip domain-name example.com

router (Config)# crypto key generate rsa

how many bits in the modulus [512] :1024/office-2013-home-premium-key-generator.html.

router (Config)# ip ssh version2

router (Config)# CTRL Z

This command is not saved in the router configuration; however, the RSA keys generated by this command are saved in the private configuration in NVRAM (which is never displayed to the user or backed up to another device) the next time the configuration is written to NVRAM.

Modulus Length

When you generate RSA keys, you will be prompted to enter a modulus length. The longer the modulus, the stronger the security. However, a longer modules take longer to generate (see the table below for sample times) and takes longer to use.

The size of Key Modulus range from 360 to 2048. Choosing modulus greater than 512 will take longer time.

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Cisco IOS software does not support a modulus greater than 4096 bits. A length of less than 512 bits is normally not recommended. In certain situations, the shorter modulus may not function properly with IKE, so we recommend using a minimum modulus of 2048 bits.

Syntax Description : Optional Strings to embed with SSH Crypto key

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