The rapid spread of wireless networks and due to the fact definitely increasing propotion data traffic handled by them, the existing centralized architecture of the mobile networks should be changed to be able to developed. The centralized mobility solutions may have several disadvantages. The overhead and delay caused by non-optimal routes are especially problematic at content delivery networks, where the servers are located at the edge of the network. Another problem is that the per unit traffic of the increasing number of mobile device is growing high and it causes bottleneck of the mobility endpoints. In addition, the mobility management is done per device basis rather than per stream or traffic, which could further leads to inefficiency. For the optimization of existing networks, a number of ideas and solution born, which often contain common or similar solutions. Such a solution might be is the Global HAHA, which distributes the home agents in the network and share the binding information between them to try to improve the efficiency. The main idea has been based on the optimalization of the routes, and the reduction of traffic latency through the distribution of the traffic and the network load associated with minimal change of the network. The operation and effectiveness of the protocol have been examined, with tests and measurements through a partial implementation in Omnet++ framework.
A mobility anchor point can serve a number of needs, so a device failure could be critical for network services. If the binding cache entries of the home agents are demaged for any reason, it also means that the services are provided to the mobile devices loss as well. The Home Agent Reliability protocol was set up by IETF to handle this problem, which solves the loss of active devices using home agents in the standby mode. The availability and reliability of network services can be further enhanced by supervision and management of the devices. Therefore, a short chapter deals with the home agents manageability, and presents a possible implementation. The SNMP protocol would have been better to solve the task, but the limitations of the IOS version, what was available for me, I used CLI interface to the management solution.