The Diameter Routing profile enables you to define the Peer Table and the Realm Routing Table properties for the Diameter Stack agent. You can also enable throttling, which allows you to prevent more than the specified number of UDRs per second to be forwarded. The throttling functionality uses the token bucket algorithm.

The Diameter Routing profile is loaded when you start a workflow that depends on it. Changes to the profile become effective when you restart the workflow. It is also possible to make changes effective while a workflow is running. For more information about this, see the section below, To Dynamically Update the Diameter Routing Profile.

To define a Diameter Routing profile, click on the New Configuration button in the upper left part of the Desktop the Image Added Desktop window, and then select Diameter Routing profile in the menu.

Routing Tab

Peer Table

A Diameter Stack agent that uses the Diameter Routing profile maintains transport connections with all the hosts that are defined in the Peer table list. Connections and handshakes of hosts that are not in this list are rejected with the appropriate protocol errors. Note that will  Note that Image Added will actively try to establish connections to any hosts that are included in this list, unless the  Do Not Create Outgoing Connections option is checked in the Diameter Stack agent.

To Add a Host

1. In the Diameter Routing Profile , click on the Add button beneath the Peer Table .

   
   

2. Enter the host name and port for the host in the Hostname and Port fields.

   
   

3. Select protocol in the Protocol drop-down-list.

   
   

4. If you want to enable throttling for the peer, select the Enable Throttling check box, and then enter the maximum number of request UDRs per second you want the Diameter Stack agent to transmit to the peer in the Throughput Threshold (UDR/s) field.

   Note
   title Note!
   Ensure that you handle the throttled UDRs in your APL code in the workflow in order to not loose any UDRs.

   
   

5. Click on the Add button and the host will be added in the Peer Table , and then click on the Close button to close the dialog when you are finished adding hosts. 

Realm Routing Table

Realm-based routing is performed when the Destination-Host AVP is not set in a Diameter message. All realm-based routing is performed based on lookups in the Realm Routing Table.

When the lookup matches more than one set of keys, the first result from the lookup will be used for routing. For this reason, the order of the rows in the Realm Routing Table must be considered. You can control the order of the rows by using the arrow buttons. Clicking on the table columns to change the displayed sort order does not have any effect on the actual order of the rows in the Realm Routing Table.

To Add a Realm

1. In the Diameter Routing Profile, click on the Add button beneath the Realm Routing Table.
    

2. Enter the realm name in the Realm text box.
    

3. If the realm serves specific applications, click on the Add button beneath the Applications list box and specify the Application Id. Repeat this step for each application.
    

4. You should only perform this step if Peer Discovery is set to Static and the peer hosts are to be specified in the Realm Routing Table. Click on the Add button beneath the Hostname list box and select a host from the drop-down list. Repeat this step for each host in the realm.
    

5. If you specified the peer hosts of the realm in the previous step, select Static from Peer Discovery. If you want to use dynamic peer discovery instead, select Dynamic from this drop-down list.
    

6. Click on the Add button and the realm will be added in the Realm Routing Table, and then click on the Close button to close the dialog when you are finished adding realms.

DNS Tab

You can use the DNS tab to configure the DNS settings used for looking up peer hosts of realms.

For information about how configure your DNS for dynamic peer discovery, see the Diameter Base Protocol (RFC 6733).

If the DNS Servers list is empty, the Diameter Stack agent will use the file /etc/resolv.conf on the Execution Context host to select the DNS server. For information about how to configure resolv.conf, see your operating system documentation.

To Dynamically Update the Diameter Routing Profile

You can refresh the routing table of a Diameter Stack agent while a workflow is running. When the agent refreshes the routing table, it reads the updated Peer Table, Realm Routing Table and Realm Routing Strategy from the selected Diameter Routing Profile.

The setting Enable Dynamic Peer Discovery in the Routing tab and the settings in the DNS tab are not read from the Diameter Routing table at refresh. To make changes to these settings effective, you must restart the workflow(s).

The routing table can be refreshed from the Workflow Monitor or from the Command Line Tool.

 In the Workflow Monitor, double-click the Diameter Stack agent to open the Workflow Status Agent configuration.
 In the Command tab, select the Update Routing Table button to refresh the routing table.

Command Line Tool

 Run the following commands:

mzcli wfcommand <workflow name> <Diameter Stack agent name>

mzcli wfcommand Default.my_workflow Stack1

When Round Robin is the selected Realm Routing Strategy, you can reset the selection cycle by running the following command:

mzcli wfcommand <workflow name> <Diameter Stack agent name> clearstrategystate

mzcli wfcommand Default.my_workflow Stack1 clearstrategystate

To Read the Realm Routing Table in APL

You can use the Diameter Stack MIM value Realm Routing Table to read the realm routing table of a Diameter Stack Agent from APL. The MIM value is of the map<string,map<string, list<string>>> type and is defined as a global MIM context type. The string values in the outer map contain the realm names (primary key). The string values of the inner map contain the applications (secondary key). The lists in the map contain the hostnames of the peers in the realm.

The string values in the outer map contain the realm names (primary key). The string values of the inner map contain the applications (secondary key). The lists in the map contain the hostnames of the peers in the realm.

Asterisks (*) are used in the strings to denote unspecified realm name or unspecified applications. The values in the inner and outer maps are sorted exactly as the Realm Routing Table of the selected Diameter routing profile.

initialize {
    //Note the space between the angle brackets!
    map<string, map<string, list<string> > > realmTable = (map<string, map<string, list<string> > >) mimGet("Stack1", "Realm Routing Table");
    //Check the size of the table
    if (mapSize(realmTable) != 2)
       abort("Realm table incorrect size");
    //Check that realms are included
    if (mapKeys(realmTable) != listCreate(string, "dr", "*"))
       abort("Wrong realms");
    //Get the inner map for realm name "dr"
    map<string, list<string> > drMap = mapGet(realmTable, "dr");
    //Get the inner map for realm name "*" (unspecified realm)
    map<string, list<string> > starMap = mapGet(realmTable, "*");
    //Any Application Id
    debug(mapGet(drMap, "*"));
    //Application Id 100
    debug(mapGet(starMap, "100"));
    //Any Application Id
    debug(mapGet(starMap, "*"));
}

12:11:40: [peer1, peer2]
12:11:40: [peer3, peer4]
12:11:40: [peer5, peer6]

For more information about MIM values published by the Diameter Stack agent, see Diameter Stack Agent Input/Output Data and MIM[hide](3.0[/hide]).