SSH access on Cisco IOS Router

The minimal configuration to access a Cisco IOS router with SSH is the following:

1. DNS domain specification:

   router(config)# ip domain name isc.heia-fr.ch
   

2. Creation of the RSA keys:

   router(config)# crypto key generate rsa
   

   You can select here the key size, take a least 2048 bytes.

3. Create a local user

   router(config)# aaa new-model
   router(config)# username cisco password cisco
   router(config)# service password-encryption
   

4. Select SSH as the only method to access your device:

   router(config)# line vty 0 4
   router(config-line)#  transport input ssh
   

SSH Server configuration on IOS XRv

The command are not the same with IOS XRv. Here are the different steps:

1. Creation of the RSA keys:

   router#crypto key generate rsa
   

   You can select here the key size, take a least 2048 bytes.

2. Activate the SSH Server:

   router(config)# ssh server v2
   

3. If the SSH access is made in a particular VRF:

   router(config)# ssh server vrf mgmt
   

4. Select SSH as the only method to access your device:

   router(config)# line default transport input ssh
   

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Dernière mise à jour: 3 October 2023