DRA Distributor Configuration

DRA Distributor Configuration Overview

DRA distributor configuration includes the following:

  • Configuring the dra-distributor VMs.

  • Adding VIPs to the dra-directors.

  • Suppressing IPv4 ARP/IPv6 neighbor discovery for the VIPs on the dra-director.

  • Adding static routes to clients (PGW, PCRF, and so on) on the dra-director.

Configuring DRA Distributor

Configuring DRA Distributor VM is performed using the ConfD CLI interface.

CLI Configuration

network dra-distributor

Add a dra-distributor cluster

Syntax

network dra-distributor <client> <range>

The following table describers the DRA Distributor configuration parameters:

Table 1. DRA Distributor Configuration Parameters

Parameter

Description

client

Name of cluster to be configured.

Value range is from 1 - 8 characters

sync-id

Unique ID per cluster. VMs with the same sync-id synchronize connection data. All VMs in the named dra-distributor synchronize their connection data in case of VM failure.

Value range is from 0 - 255

sync-interface

Interface used to send multicast connection sync data. Typically an interface on the Internal network.

Example: ens192

global-tracking-service

Container to track for health check of dra-director VMs for all services.

Default value is diameter-endpoint

host-ip

IP address of member VM.

Value: Any IP address that exists on the VM. Typically, internal IP address.

global-priority

Global priority for all services of the host on which the service must run. Can be overridden in an individual service configuration.

Priority range is from 1 to 255. Larger values have higher priority than lower values.

Example: 10 has a higher priority than 5.

service-name

Unique name for peer service.

virtual-router-id

Virtual router ID is the identity for a virtual router for hosts that are managed for the virtual IP of the service.

Value range is from 0 - 255.

For more details, refer to VRRP (Virtual Router Redundancy Protocol) RFC 3768 and keepalive documentation.

tracking-service

Container to track for health check of dra-director VM. Overrides global-tracking-service.

Default value is global-tracking-service.

preempt-delay

Preempt delay is delay in seconds before a VIP switches from backup to master.

Default value is 30 seconds.

Value range is from 1 - 1000.

interface

Interface of the host where the virtual IP is installed as secondary address when active.

service-ip

Virtual IP address of service.

service-port

TCP port of service.

service-host-ip

IP address of VM. Used to override global priority.

service-priority

Overrides global-priority. This allows a VIP to run on VM1 and another VIP to run on VM2.

Example: Gx VIP on VM1 and Rx VIP on VM2.

preempt

Enable or disable VIP preemption for a single VIP.

Default value is true.

Value: true, false

real-service-ip

IP address of a dra-director supporting the service.

weight

Relative weight of real-server used by weighted least connection scheduling algorithm.

Value range is from 0 - 255.

Default value is 1.

A value of 0 disables new connections to this real-server.

Sample Configuration

network dra-distributor client
 sync-id          1
 sync-interface   ens192
 tracking-service diameter-endpoint
 preempt-delay 5
 host 192.169.21.20
  priority 10
 !
 host 192.169.21.21
  priority 5
 !
 service Gx
  virtual-router-id 60
  interface         ens224
  service-ip        192.169.22.50
  service-port      3868
  real-server 192.169.22.13
   weight 100
  !
  real-server 192.169.22.14
  !
 !
 service Rx
  virtual-router-id 61
  interface         ens224
  service-ip        192.169.25.80
  service-port      3868
  host 192.169.21.20
   priority 4
  !
  host 192.169.21.21
   priority 9
  !
  real-server 192.169.25.13
  !
  real-server 192.169.25.14
  !
 !
!
network dra-distributor server
 sync-id          2
 sync-interface   ens192
 tracking-service diameter-endpoint
 preempt-delay 5
 host 192.169.21.30
  priority 10
 !
 host 192.169.21.31
  priority 5
 !
 service Gx
  virtual-router-id 70
  interface         ens224
  service-ip        192.169.23.70
  service-port      3868
  real-server 192.169.23.13
   weight 100
  !
  real-server 192.169.23.14
  !
 !
 service Rx
  virtual-router-id 71
  interface         ens256
  service-ip        192.169.28.70
  service-port      3668
  real-server 192.169.28.13
  !
  real-server 192.169.28.14
  !
 !
!

Configuration Status Check

To check the distributor status use show dra-distributor command.

Example: 

admin@orchestrator[master-0]# show dra-distributor ?
Possible completions:
  daemon  list  rate  stats
admin@orchestrator[master-0]# show dra-distributor

To verify distributor VIPs use show network ips command.

To verify director VIP/netfilter rules use the following commands:

ip -4 addr show (Confirm VIP address exists)
ip -6 addr show (Confirm VIP address exists)
sudo arptables --list (Confirm rule exist for each vip)
sudo ip6tables --list (Confirm ipv6 neighbor-solicitation/advertisement filters for each vip)