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Catalyst 4500 Series Switch, Cisco IOS Software Configuration Guide - Cisco IOS XE 3.9.xE and IOS 15.2(5)Ex
Chapter 52 Configuring Web-Based Authentication
About Web-Based Authentication
LAN Port IP
You can configure LAN port IP (LPIP) and Layer 2 web-based authentication on the same port. The host
is authenticated using web-based authentication first, followed by LPIP posture validation. The LPIP
host policy overrides the web-based authentication host policy.
If the web-based authentication idle timer expires, the NAC policy is removed. The host is authenticated
and posture is validated again.
Gateway IP
You cannot configure Gateway IP on a Layer 3 VLAN interface if web-based authentication is
configured on any of the switch ports in the VLAN.
You can configure web-based authentication on the same Layer 3 interface as Gateway IP. The host
policies for both features are applied in software. The GWIP policy overrides the web-based
authentication host policy.
ACLs
If you configure a VLAN ACL or Cisco IOS ACL on an interface, the ACL is applied to the host traffic
only after the web-based authentication host policy is applied.
For Layer 2 web-based authentication, you must configure a port ACL (PACL) as the default access
policy for ingress traffic from hosts connected to the port. After authentication, the web-based
authentication host policy overrides the PACL.
You cannot configure a MAC ACL and web-based authentication on the same interface.
You cannot configure web-based authentication on a port whose access VLAN is configured for VACL
capture.
Context-Based Access Control
Web-based authentication cannot be configured on a Layer 2 port if context-based access control
(CBAC) is configured on the Layer 3 VLAN interface of the port’s VLAN.
802.1X Authentication
You cannot configure web-based authentication on the same port as 802.1X authentication except as a
fallback authentication method.
EtherChannel
You can configure web-based authentication on a Layer 2 EtherChannel interface. The web-based
authentication configuration applies to all member channels.
Switchover
On Catalyst 4500 series switches with redundant supervisor engines in RPR mode, information about
currently authenticated hosts is maintained during a switchover. You do not need to reauthenticate.
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