how many vty lines are there? (2024)

FAQs

How many vty lines are there? ›

By default all routers have 5 vty lines (factory defaults). Unless you configure the remaining available lines, there is no need for them to be protected. You created additional lines, when you specified the number 0 197. Hence you will need to protect those lines, ones they are created.

The number of VTY lines varies by device model. Common configurations include 5 lines (0-4) and 16 lines (0-15), but some devices may support more or fewer lines.

vty is the virtual terminal, or telnet. There are 16 total vty sessions available. The numbers represent each session, so vty 5 15 means you are configuring vty sessions 5 through 15.

The abstract “0 - 4” means that the device can allow 5 simultaneous virtual connections which may be Telnet or SSH. In a way, we may say that 5 (0 – 4) are connection ports to the Router or Switch. In fact, we may have connection ports up to 16 (0 – 15).

The value range is 0 to 7 for AUX lines and 0 to 63 for VTY lines. last-number2: Specifies the relative number of the last user line. The value range is 1 to 7 for AUX lines and 1 to 63 for VTY lines.

If you use telnet or SSH to access the switch they are accessing the vty lines and use the password configured on the vty. You need 2 passwords because there are 2 different ways to access the switch. While it is common to use the same password for both console and vty there is no requirement that they be the same.

Second, by default Telnet is associated with the VTY lines. Telnet uses TCP port number 23 and is one of the most commonly used protocols for remote access. However, telnet doesn't have any type of confidentiality. In other words, it has no encryption mechanism.

Virtual teletype (VTY) is a command line interface that gives users access to a device's control plane, most often in network devices like routers and switches. By using it, administrators can configure, manage, and monitor the device remotely.

Virtual Teletype (VTY) lines indicate the possible simultaneous connections allowed to a particular router from a socket availability perspective, being 0 through 5 or any arbitrary range, this is what signifies.

VTY lines are usually used for creating out-of-band management sessions to devices. If a password is not supplied on a vty line, that line cannot be used for managing the device. In some cases administrators may decide to let junior staff to use lines 0 - 4 and senior staff to use lines 5 - 15.

What is Vty vs console line? ›

console 0 is the physical console port on the switch/router you plug into. line vty is when you remote into the switch/router via telnet or ssh. the config-line is letting you know you are currently in configuration mode for that specific line. Some commands are also different in relation to them.

Passwords on VTY lines are used to control access to the router itself. By default, it only provides non-privileged access, so you can't change any configuration.

TTYs are asynchronous connections between the router's async interfaces and serial devices (modems). If you are connecting modems to your router or access server for dial-up or dial-out connections, you will need to configure the TTY ports. The TTY ports correspond directly to async interfaces.

By default all routers have 5 vty lines (factory defaults). Unless you configure the remaining available lines, there is no need for them to be protected.

Level 15 – Privilege level access allows you to enter in Privileged Exec mode and provides complete control over the router.

The range is from 2 to 4094; VLAN1 is the default VLAN and cannot be created or deleted. You cannot create or delete those VLANs that are reserved for internal use.

Lines 0 15 is vty lines 0, 1, 2 ,3 ,4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14 and 15. for example if you were type in global configuration mode, line vty 0 15 you will enter configuration for lines 0-15. I hope this answers your question.

By default all routers have 5 vty lines (factory defaults).

If you specify a network in this command, BGP establishes EBGP sessions to all indirectly connected dynamic peers in the network. hop-count: Specifies the maximum number of hop counts, in the range of 1 to 255. The default is 64.