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It Prompts Address Confliction in Configuring addrmap Command When One SBC Serves as Proxy Equipment for Two Softx3000s

Publication Date:  2012-08-09 Views:  87 Downloads:  0
Issue Description
One SBC serves as the proxy of two Softx3000s. softx3000_A serves user-group-A, and softx3000_B for user-group-B. However, it prompts error when using addrmap command to configure the mapping of softx3000_B, and the configuration fails. The topology is: 
Softx3000_A----------------Internet-------------(server)Eudemon SBC(client)-----------------user_group_A
                                                  |                                                                                        |
                                                  |                                                                                        |
                                          Softx3000_B                                                                 user_group_B
The address of both Softx3000 is 100.0.0.1 and 200.0.0.1 respectively; the address of SBC server interface is 150.0.0.1, and that of client is 10.0.0.1.
The original command is: sbc addrmap clientaddr 10.0.0.1 serveraddr 150.0.0.1 softxaddr 100.0.0.1
When using the following command to configure the mapping of softx3000_B, error is prompted, and the configuration is failed:
sbc addrmap clientaddr 10.0.0.1 serveraddr 150.0.0.1 softxaddr 200.0.0.1
Alarm Information
Null
Handling Process
The difference between SBC and a router lies in that the master IP and slave IP can belong to the same sub-net at the same interface of SBC.
At the interface connecting to Internet, configure the slave IP by the following command:  ip address 150.0.0.2 255.255.255.0 sub
At the interface connecting to the user, configure the slave IP by the following command:  ip address 10.0.0.2 255.255.255.0 sub
Use addrmap command to set up another group of mapping:  sbc addrmap clientaddr 10.0.0.2 serveraddr 150.0.0.2 softx3000  200.0.0.1
Root Cause
In the topology, there are two groups of mapping and each uses the same serveraddr and clientaddr. However, it may result in chaotic session table, so the configuration is not permitted. 
Solution: Configure one slave IP address for upstream and downstream interfaces of SBC respectively, which can be used to set up mapping of softx3000_B.
Suggestions
The solution is recommended when one SBC serves as proxy for two or more softx3000s.

END