2.4 DSR Nodes

Each DSR message processor (MP) can host up to 48 Diameter Nodes (also called Diameter Identities). Hosting more than one node/identity allows a DSR deployment at the Network Edge where DSR acts as the single point of contact for all Diameter elements external to the operator network and similarly all internal Diameter elements use it as the point of contact when reaching Diameter servers external to the operator network. Another use case for hosting multiple Diameter nodes on each MP is to support multiple connections from an external Diameter element to the DSR.

Each Diameter Node has the following attributes:

• Diameter Realm that may be unique or shared across the nodes.
• Up to 128 local IP addresses - IPv4 or IPv6 addresses or a combination of IPv4 and IPv6 addresses. (Each DA-MP supports up to 8 local IP addresses and 32 DA-MPs are supported).
• A unique Fully Qualified Domain Name (FQDN).

DSR allows an IP address to be shared across nodes provided the combination of IP address, port and transport are unique across nodes.

See the following figure for a sample configuration:

Figure 2-5 Multiple Nodes per Message Processor