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TIBCO Rendezvous® 8.8.0

# Crossing Network Boundaries

When a network boundary separates `rvcache` from its client programs, and a routing daemon (`rvrd`) connects them across that boundary, you must configure `rvrd` to ensure correct operation of `rvcache`.

## Cached Subjects

The routing daemons (on both sides of the neighbor link) must permit all the cached subjects to flow from all senders to all `rvcache` processes.

## Query Subjects

The `rvrd` configuration for exchanging query subjects depends on the distribution of `rvcache` and its query clients.

| • | If each network runs one local cache process, with all the caches synchronized (so they all contain the same data), then it is crucial that only one `rvcache` process receive each query. The routing daemons must not import or export `_SNAP.>` (the query subject).

| • | If only one network runs a cache process, and programs on other networks query it across the network boundary, then the routing daemons must forward `_SNAP.>` (the query subject) into the `rvcache` network. That is, `rvrd` must import these query names into the `rvcache` network; `rvrd` must export these query names from each query client network.

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