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Authentication, Authorization, and Accounting Commands on Cisco IOS XR Software
aaa authentication
SR-7
Cisco IOS XR System Security Command Reference
Command History
Usage Guidelines To use this command, you must be in a user group associated with a task group that includes the proper
task IDs. For detailed information about user groups and task IDs, see the Configuring AAA Services on
Cisco IOS XR Software module of the Cisco IOS XR System Security Configuration Guide.
Use the aaa authentication command to create a series of authentication methods, or method list. You
can specify up to four methods in the method list. A method list is a named list describing the
authentication methods to be used (such as TACACS+ or RADIUS) in sequence. The subsequent
methods of authentication are used only if the initial method is not available, not if it fails.
The default method list is applied for all interfaces for authentication, except when a different named
method list is explicitly specified—in which case the explicitly specified method list overrides the
default list.
For console and vty access, if no authentication is configured, a default of local method is applied.
Note • The group tacacs+, group radius, and group group-name forms of this command refer to a set of
previously defined TACACS+ or RADIUS servers.
• Use the tacacs-server host or radius-server host command to configure the host servers.
• Use the aaa group server tacacs+ or aaa group server radius command to create a named subset
of servers.
• The login keyword, remote keyword, local option, and group option are available only in
administration configuration mode.
Task ID
Examples The following example shows how to specify the default method list to be used for authentication, and
also enable authentication for console:
RP/0/RP0/CPU0:router# configure
RP/0/RP0/CPU0:router(config)# aaa authentication login default group tacacs+
Related Commands
Release Modification
Release 2.0 This command was introduced on the Cisco CRS-1.
Release 3.0 No modification.
Release 3.2 This command was supported on the Cisco XR 12000 Series Router.
Release 3.3.0 The method-list argument was added to specify either group tacacs+, group
radius, group named-group, local, or line options.
Task ID Operations
aaa read, write
Command Description
aaa accounting Creates a method list for accounting.
aaa authorization Creates a method list for authorization.