Dell Configuration Guide for the S4048–ON System 9.14.2.6

Disconnect Message Processing

This section lists various actions that the NAS performs during DM processing.

The following activities are performed by NAS:

• responds with DM-Nak, if no matching session is found in NAS for the session identification attributes in DM; Error-Cause value is “Session Context Not Found” (503).
• responds with DM-Nak for any internal processing error in NAS; Error-Cause value is “Resources Unavailable” (506).
• ignores attributes that are supported as per RFC but are irrelevant to the DM operation.
• responds to a disconnect message containing one or more incorrect attributes values with a Disconnect-NAK; Error-Cause value is “Invalid Attribute Value” (407).
• responds to a disconnect message containing unsupported attributes with DM-Nak; Error-Cause value is “Unsupported Attributes” (401).
  NOTE Unsupported attributes are the ones that are not mentioned in the RFC 5176 but present in the disconnect message that is received by the NAS.
• rejects the disconnect message containing NAS-IP-Address or NAS-IPV6-Address attribute that does not match NAS with DM-Nak; Error-Cause value is “NAS Identification Mismatch” (403).
• responds with a DM-Nak, if the NAS is configured to prohibit honoring of disconnect messages; Error-Cause value is “Administratively Prohibited” (501).