6.13. Redirect-Host-Usage AVP

6.13. Redirect-Host-Usage AVP

The Redirect-Host-Usage AVP (AVP Code 261) is of type Enumerated. This AVP MAY be present in answer messages whose 'E' bit is set and the Result-Code AVP is set to DIAMETER_REDIRECT_INDICATION.

When present, this AVP provides hints about how the routing entry resulting from the Redirect-Host is to be used. The following values are supported:

DONT_CACHE 0

The host specified in the Redirect-Host AVP SHOULD NOT be cached. This is the default value.

ALL_SESSION 1

All messages within the same session, as defined by the same value of the Session-ID AVP SHOULD be sent to the host specified in the Redirect-Host AVP.

ALL_REALM 2

All messages destined for the realm requested SHOULD be sent to the host specified in the Redirect-Host AVP.

REALM_AND_APPLICATION 3

All messages for the application requested to the realm specified SHOULD be sent to the host specified in the Redirect-Host AVP.

ALL_APPLICATION 4

All messages for the application requested SHOULD be sent to the host specified in the Redirect-Host AVP.

ALL_HOST 5

All messages that would be sent to the host that generated the Redirect-Host SHOULD be sent to the host specified in the Redirect-Host AVP.

ALL_USER 6

All messages for the user requested SHOULD be sent to the host specified in the Redirect-Host AVP.

When multiple cached routes are created by redirect indications and they differ only in redirect usage and peers to forward requests to (see Section 6.1.8), a precedence rule MUST be applied to the redirect usage values of the cached routes during normal routing to resolve contentions that may occur. The precedence rule is the order that dictate which redirect usage should be considered before any other as they appear. The order is as follows:

1. ALL_SESSION

2. ALL_USER

3. REALM_AND_APPLICATION

4. ALL_REALM

5. ALL_APPLICATION

6. ALL_HOST