Re: [Dime] Issue#31 status

Steve,

I think we can easily extend the proposed text for #56 to cover these points:

    5.5.1.  Overload Control State (OCS)

    5.5.1.1   Overload Control States for reacting nodes

    A reacting node maintains per supported Diameter application

    - a host-type Overload Control State for each Destination-Host towards

      which it sends host-type requests and

    - a realm-type Overload Control State for each Destination-Realm towards

      which it sends realm-type requests.

    A host-type Overload Control State may be identified by the pair of

    Application-Id and Destination-Host.

    A realm-type Overload Control State may be identified by the pair of

    Application-Id and Destination-Realm.

    The host-type/realm-type Overload Control State for a given pair of

    Application and Destination-Host / Destination-Realm could include the

    following information:

    - Sequence number (as reveived in OC-OLR)

    - Time of expiry  (deviated from validity duration as received in OC-OLR

      and time of reception)

    - Selected Abatement Algorithm (as received in OC-Supported-Features)

    - Algorithm specific input data (as received within OC-OLR, e.g.

      Reduction Percentage for Loss)

    5.5.1.2   Overload Control States for reporting nodes

    A reporting node maintains per supported Diameter application and per

    supported (and eventually selected) Abatement Algorithm an Overload

    Control State.

    An Overload Control State may be identified by the pair of Application-Id

    and supported Abatement Algorithm.

    The Overload Control State for a given pair of Application and Abatement

    Algorithm could include the information:

    - Sequence number

    - Validity Duration and Expiry Time

    - Algorithm specific input data (e.g. Reduction Percentage for Loss)

    Overload Control States for reporting nodes containing a validity duration of 0 sec. should

    not expire before any previously sent (stale) OLR has timed out at any reacting node.

    5.5.1.3  Maintaining Overload Control States

    Reacting nodes create a host-type OCS identified by OCS-Id = (app-id,host-id) when receiving

    an answer message of application app-id containing an Orig-Host of host-id and a

    host-type OC-OLR AVP unless such host-type OCS already exists.

    Reacting nodes create a realm-type OCS identified by OCS-Id = (app-id,realm-id) when receiving

    an answer message of application app-id containing an Orig-Realm of realm-id and a

    realm-type OC-OLR AVP unless such realm type OCS already exists.

    Reacting nodes delete an OCS when it expires (i.e. when current time

    minus reception time is greater than validity duration).

    Reacting nodes update the host-type OCS identified by OCS-Id = (app-id,host-id) when

    receiving an answer message of application app-id containing an Orig-Host of

    host-id and a host-type OC-OLR AVP with a sequence number higher than the

    stored sequence number.

    Reacting nodes update the realm-type OCS identified by OCS-Id = (app-id,realm-id) when

    receiving an answer message of application app-id containing an Orig-Realm of

    realm-id and a realm-type OC-OLR AVP with a sequence number higher than the

    stored sequence number.

    Reacting nodes do not delete an OCS when receiving an answer message that does not

    contain an OC-OLR AVP (i.e. absence of OLR means "no change").

    Reporting nodes create an OCS identified by OCS-Id = (app-id,Alg) when receiving a

    request of application app-id containing an OC-Supported-Features AVP

    indicating support of the Abatement Algorithm Alg (which the reporting

    node selects) while being overloaded, unless such OCS already exists.

    Reporting nodes delete an OCS when it expires.

    Reporting nodes update the OCS identified by OCS-Id = (app-id,Alg) when they detect the

    need to modify the requested amount of application app-id traffic reduction.

From: DiME [mailto:dime-bounces@ietf.org] On Behalf Of ext Steve Donovan
Sent: Monday, March 24, 2014 10:06 PM
To: dime@ietf.org
Subject: Re: [Dime] Issue#31 status

All,

Can someone boil down the various proposed wording for this issue into what we want to have in the -02 draft.

Thanks,

Steve
On 2/19/14 8:17 AM, Wiehe, Ulrich (NSN - DE/Munich) wrote:
#31: Sending OC-Ongoing-Throttling-Info AVP in request messages that survived a throttling

Dear all,

I did not receive much support for the proposal to define an OC-Ongoing-Throttling-Info AVP in request messages that survived a throttlting.

However, we seem to agree on some principles:

Missing OLR in answer means "no change"; it does not mean "no overload/no throttling requested"

Reporting nodes SHOULD include OLR in every answer that it sends in response to a request message which indicated OLR_DEFAULT_ALGO support unless the reporting node has very good reasons not to do so. Exact wording is not yet agreed.

Ulrich

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