Cisco Cisco SG300-28 28-Port Gigabit Managed Switch Maintenance Manual

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Security: 802.1X Authentication
Authenticator Overview
Cisco 300 Series Managed Switches Administration Guide
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A port is authorized if there is an authorized client. Only one host can be 
authorized on a port.
When a port is unauthorized and the guest VLAN is enabled, untagged 
traffic is remapped to the guest VLAN. Tagged traffic is dropped unless it 
belongs to the guest VLAN or to an unauthenticated VLAN. If a guest VLAN 
is not enabled on the port, only tagged traffic belonging to the 
unauthenticated VLANs is bridged.
When a port is authorized, untagged and tagged traffic from the authorized 
host is bridged based on the static VLAN membership port configuration. 
Traffic from other hosts is dropped.
A user can specify that untagged traffic from the authorized host will be 
remapped to a VLAN that is assigned by a RADIUS server during the 
authentication process. Tagged traffic is dropped unless it belongs to the 
RADIUS-assigned VLAN or the unauthenticated VLANs. Radius VLAN 
assignment on a port is set in the Security > 802.1X/MAC/Web 
Authentication > Port Authentication page.
Multi-Host Mode
A port is authorized if there is if there is at least one authorized client. 
When a port is unauthorized and a guest VLAN is enabled, untagged traffic 
is remapped to the guest VLAN. Tagged traffic is dropped unless it belongs 
to the guest VLAN or to an unauthenticated VLAN. If guest VLAN is not 
enabled on a port, only tagged traffic belonging to unauthenticated VLANs 
is bridged.
When a port is authorized, untagged and tagged traffic from all hosts 
connected to the port is bridged, based on the static VLAN membership 
port configuration.
You can specify that untagged traffic from the authorized port will be 
remapped to a VLAN that is assigned by a RADIUS server during the 
authentication process. Tagged traffic is dropped unless it belongs to the 
RADIUS-assigned VLAN or to the unauthenticated VLANs. Radius VLAN 
assignment on a port is set in the Port Authentication page.
Multi-Sessions Mode
Unlike the single-host and multi-host modes, a port in the multi-session 
mode does not have an authentication status. This status is assigned to 
each client connected to the port. This mode requires a TCAM lookup. 
Since Layer 3 mode switches do not have a TCAM lookup allocated for