Concept Guide
Attributes
In Disconnect messsage requests and CoA-Request packets, certain attributes are used to uniquely identify the NAS as well as user
sessions on the NAS.
The combination of NAS and session identication attributes included in a CoA-request or a disconnect-message request must match at
least one session in order for a request to be successful; otherwise, a disconnect-Nak or CoA-Nak is sent. For disconnect-user operations
using DMs, if all NAS identication attributes match, and more than one session matches all of the session identication attributes, then a
CoA-request or a disconnect-message request applies to all matching sessions.
The following tables describe the various types of attributes that identify the NAS and the user sessions:
Table 90. NAS Identication Attributes
Attribute
code
Attribute Description
4 NAS-IP-Address IPv4 address of the NAS.
95 NAS-IPv6–Address IPv6 address of the NAS.
Table 91. Change of Authorization (CoA) Attribute
Attribute
code
Attribute Description
5 NAS-Port Port associated with the session to be processed for EAP or MAB users or the VTY ID for
AAA sessions.
Table 92. Session Identication Attributes
Attribute
code
Attribute Description
31 Calling-Station-Id (MAC
Address)
The link address from which session is connected.
Table 93. Vendor-specic Attributes
Attribute
code
Attribute Description
26 Vendor-
specic
NAS supports the following values for the vendor-specic attributes:
• t=26(vendor-speic);l=length;vendor-identication-attribute;Length=value;data=”cmd=re-
authenticate”
• t=26(vendor-speic);l=length;vendor-identication-attribute;Length=value;data=”cmd=disable-host-
port”
• t=26(vendor-speic);l=length;vendor-identication-attribute;Length=value;data=”cmd=bounce-host-
port”
• t=26(vendor-speic);l=length;vendor-identication-attribute;Length=value;data=”cmd=terminate-
session”
• t=26(vendor-speic);l=length;vendor-identication-attribute;Length=value;data=”cmd=disconnect-
user”
The vendor identication attribute can be one of the following:
• v=9(Cisco);Vendor-Type=1(cisco-av-pair) Length = value
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