Dell MX9116n EMC SmartFabric OS10 User Guide Release 10.5.1 - Page 1151
Limit concurrent login sessions, Virtual terminal line ACLs, View SNMP ACL configuration
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1. Create access lists with permit or deny filters; for example: OS10(config)# ip access-list snmp-read-only-acl OS10(config-ipv4-acl)# permit ip 172.16.0.0 255.255.0.0 any OS10(config-ipv4-acl)# exit OS10(config)# 2. Apply ACLs to an SNMP community in CONFIGURATION mode. OS10(config)# snmp-server community public ro acl snmp-read-only-acl View SNMP ACL configuration OS10# show snmp community Community : public Access : read-only ACL : snmp-read-only-acl Limit concurrent login sessions To avoid an unlimited number of active sessions on a switch for the same user ID, limit the number of console and remote connections. Log in from a console connection by cabling a terminal emulator to the console serial port on the switch. Log in to the switch remotely through a virtual terminal line, such as Telnet and SSH. ● Configure the maximum number of concurrent login sessions in CONFIGURATION mode. OS10(config)# login concurrent-session limit number ○ limit number - Sets the maximum number of concurrent login sessions allowed for a user ID, from 1 to 12; default 10. When you configure the maximum number of allowed concurrent login sessions, take into account that: ● Each remote VTY connection counts as one login session. ● All login sessions from a terminal emulator on an attached console count as one session. Configure concurrent login sessions OS10(config)# login concurrent-session limit 4 If you log in to the switch after the maximum number of concurrent sessions are active, an error message displays. To log in to the system, close one of your existing sessions. OS10(config)# login concurrent-session limit 4 Too many logins for 'admin'. Last login: Wed Jan 31 20:37:34 2018 from 10.14.1.213 Connection to 10.11.178.26 closed. Current sessions for user admin: Line Location 2 vty 0 10.14.1.97 3 vty 1 10.14.1.97 4 vty 2 10.14.1.97 5 vty 3 10.14.1.97 Virtual terminal line ACLs To limit Telnet and SSH connections to the switch, apply access lists on a virtual terminal line (VTY). There is no implicit deny rule. If none of the configured conditions match, the default behavior is to permit. If you need to deny traffic that does not match any of the configured conditions, explicitly configure a deny statement. 1. Create IPv4 or IPv6 access lists with permit or deny filters; for example: OS10(config)# ip access-list permit10 OS10(config-ipv4-acl)# permit ip 172.16.0.0 255.255.0.0 any Security 1151
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