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Critical Voice VLAN Support
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Contents
Critical Voice VLAN SupportLast Updated: July 17, 2012
Critical Voice VLAN Support puts phone traffic into the configured voice VLAN of a port if the authentication server becomes unreachable. With normal network connectivity, when an IP phone successfully authenticates on a port, the authentication server puts the phone into the voice domain. If the authentication server becomes unreachable, IP phones cannot authenticate. In multidomain authentication (MDA) mode or multiauthentication mode, you can configure the Critical Voice VLAN support feature to put phone traffic into the configured voice VLAN of the port. Finding Feature InformationYour software release may not support all the features documented in this module. For the latest feature information and caveats, see the release notes for your platform and software release. To find information about the features documented in this module, and to see a list of the releases in which each feature is supported, see the Feature Information Table at the end of this document. Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to www.cisco.com/go/cfn. An account on Cisco.com is not required. Information About Critical Voice VLAN Support
Critical Voice VLAN Support in Multidomain Authentication ModeIf critical voice VLAN is deployed using the interface in MDA mode, the host mode will be changed to multihost and the first phone device will be installed as a static forwarding entry. Any additional phone devices will install a dynamic forwarding entry in the PM HAT table. For further information about host modes, see the "IEEE 802.1X Host Mode" section in the "Configuring IEEE 802.1X Port-Based Authentication" chapter.
Critical Voice VLAN Support in Multiauthentication ModeIf the critical authentication feature is deployed in multiauthentication mode, only one phone device will be allowed and a second phone trying to authorize will trigger a violation. The show authentication sessions CLI will display the critical voice client data. A critically authorized voice client in multiauthentication host mode will be in the "authz success" and "authc fail" state. How to Configure Critical Voice VLAN Support
Configuring Critical Voice VLAN Support in Multidomain Authentication Mode
SUMMARY STEPS
DETAILED STEPS Configuring Critical Voice VLAN Support in Multiauthentication Mode
SUMMARY STEPS
DETAILED STEPS
Configuration Examples for Critical Voice VLAN Support
Example: Critical Voice VLAN Support in Multidomain Authentication ModeThe following example shows how to enable the Critical Voice VLAN feature in MDA host-mode: Switch(config) interface GigabitEthernet 0/0/0 Switch(config-if)# switchport access vlan 10 Switch(config-if)# switchport voice vlan 110 Switch(config-if)# no ip address Switch(config-if)# authentication event server dead action authorize vlan 12 Switch(config-if)# authentication event server dead action authorize voice Switch(config-if)# authentication host-mode multi-domain Switch(config-if)# authentication port-control auto Switch(config-if)# mab Switch(config-if)# dot1x pae authenticator Switch(config-if)# end Example: Critical Voice VLAN Support in Multiauthentication ModeThe following example shows how to enable the Critical Voice VLAN support feature in multiauthentication mode: Switch(config) interface GigabitEthernet 0/0/0 Switch(config-if)# switchport access vlan 10 Switch(config-if)# switchport voice vlan 110 Switch(config-if)# no ip address Switch(config-if)# authentication event server dead action reinitialize vlan 12 Switch(config-if)# authentication event server dead action authorize voice Switch(config-if)# authentication host-mode multi-auth Switch(config-if)# authentication port-control auto Switch(config-if)# mab Switch(config-if)# dot1x pae authenticator Switch(config-if)# end Additional ReferencesRelated DocumentsTechnical Assistance
Feature Information for Critical Voice VLAN SupportThe following table provides release information about the feature or features described in this module. This table lists only the software release that introduced support for a given feature in a given software release train. Unless noted otherwise, subsequent releases of that software release train also support that feature. Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to www.cisco.com/go/cfn. An account on Cisco.com is not required.
Cisco and the Cisco logo are trademarks or registered trademarks of Cisco and/or its affiliates in the U.S. and other countries. To view a list of Cisco trademarks, go to this URL: www.cisco.com/go/trademarks. Third-party trademarks mentioned are the property of their respective owners. The use of the word partner does not imply a partnership relationship between Cisco and any other company. (1110R) Any Internet Protocol (IP) addresses and phone numbers used in this document are not intended to be actual addresses and phone numbers. Any examples, command display output, network topology diagrams, and other figures included in the document are shown for illustrative purposes only. Any use of actual IP addresses or phone numbers in illustrative content is unintentional and coincidental. © 2012 Cisco Systems, Inc. All rights reserved.
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