It is commonplace for users in a routed internetwork to have repetitive and habitual external addresses to which they need to be connected, such as particular file servers or remote corporate destinations. For this reason, the edge device can save ("cache") this virtual channel information to be reused without having to issue address resolution requests for every flow. This is a valuable aspect of the MPOA concept. A design goal of MPOA is to minimize the number of times the edge device must visit the route server to retrieve this information. To that end, the MPC maintains its own address cache. Much of the MPOA effort is devoted to devising effective cache-management techniques, including ensuring cache coherency between MPCs and MPSs.
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