How many VTY user interfaces does a switch support

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By default, a switch allows a maximum of five VTY users at a time. You can set the maximum number of VTY users allowed using the user-interface maximum-vty command. This maximum number can be set to 15 at most (a maximum of 15 VTY users allowed).
When the maximum number of VTY user interfaces is set to 0, no user (even NMS user) can log in to the switch.

Other related questions:
How many users does the U1910 support?
The U1910 supports a maximum of 100 users.

The maximum number of VTY user interfaces on S series switches
S series switches (except S1700) support the maximum number of VTY user interfaces: The switch defaults up to 5 VTY users online at the same time. You can use the user-interface maximum-vty command to configure up to 15 VTY users to be online at the same time. When the maximum number of VTY user interfaces is 0, no user (including network management users) can log in to the switch.

Can AR1220 support 100 users
As described on brochures, AR1220 can support 100 users if the traffic of each user is not large. However, the performance of AR1220 may decrease if the traffic of each user is large. Recommended user numbers of different devices are described as follows: AR3260: more than 350 users AR2220: 50 to 350 users AR1200: fewer than 50 users AR150 and AR200: fewer than 30 users

How many member interfaces does an aggregation group of the switch support
An aggregation group of the switch supports a maximum of eight member interfaces. NOTE: An aggregation group of the S2700SI supports a maximum of four member interfaces.

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