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DHCP Termination Causes and Code Values

When a DHCP event terminates a subscriber session, causing a RADIUS Acct-Stop message to be issued, the RADIUS Acct-Terminate-Cause attribute (49) reports the cause or reason for the termination. This attribute is included only in RADIUS Acct-Stop messages. The termination cause is conveyed as a code value in the attribute. RFC 2866, RADIUS Accounting, defines the standard mapping between 18 code values and termination causes.

Junos OS defines a set of internal termination cause codes that are mapped to the RFC-defined code values. When a subscriber session is terminated, the router logs a message for the internal termination cause and logs another message for the RADIUS Acct-Terminate-Cause attribute. You can use the logged information to help monitor and troubleshoot terminated sessions.

Table 1 lists the default mapping between the internal identifier for DHCP termination causes and the code values that represent them in the RADIUS Acct-Terminate-Cause attribute (49).

Note:

You can remap the internal identifiers to a custom code value in the range 1 through 4,294,967,295 by using the terminate-code statement at the [edit access] hierarchy level. You can view the current mapping by issuing the show network-access terminate-code dhcp detail command.

Table 1: Default Mapping Between DHCP Termination Causes and Code Values

Internal DHCP

Termination Cause

RADIUS Acct-Terminate-Cause Attribute

 

Code Value

RADIUS Termination Cause

client request

1

User Request

lost-carrier

2

Lost Carrier

nak

15

Service Unavailable

nas logout

10

NAS Request

no offers

4

Idle Timeout