Users Guide

Parameters
● rsa bits — Regenerates the RSA key with the specified bit size: 2048, 3072, or 4096; default
2048.
● ecdsa bits — Regenerates the ECDSA key with the specified bit size: 256, 384, or 521; default
256.
● ed25519 — Regenerates the Ed25519 key with the default bit size.
Default The SSH server uses default public key lengths for client authentication:
● RSA key: 2048 bits
● ECDSA key : 256 bits
● Ed25519 key: 256 bits
Command Mode EXEC
Usage
Information
If necessary, you can regenerate the public keys used by the SSH server with a customized bit size. You
cannot change the default size of the Ed25519 key. The crypto ssh-key generate command is
available only to the sysadmin and secadmin roles.
Example
OS10# crypto ssh-key generate rsa 4096
Host key already exists. Overwrite [confirm yes/no]:yes
Generated 4096-bit RSA key
OS10#
Supported
Releases
10.4.1.0 or later
login concurrent-session limit
Configures the maximum number of concurrent login sessions allowed for a user ID.
Syntax
login concurrent-session limit number
Parameters limit number — Enter the limit of concurrent login sessions, from 1 to 12.
Default 10 concurrent login sessions
Command Mode CONFIGURATION
Usage
Information
The total number of concurrent login sessions for the same user ID includes all console and remote
connections, where:
● Each remote VTY connection counts as one login session.
● All login sessions from a terminal emulator on an attached console count as one session.
The no version of the command disables the configured number of allowed login sessions.
Example
OS10(config)# login concurrent-session limit 7
Supported
Releases
10.4.1.0 or later
line vty
Enters virtual terminal line mode to access the virtual terminal (VTY).
Syntax
line vty
Parameters None
Default Not configured
Command Mode CONFIGURATION
Usage
Information
None
1346 Security