This section explains instances of exceptional route compression behavior.
When a node does not have any best route.
Consider the routing table shown in Route Manager‘s Table When There is No Best Route for a Node. When a node does not have any best route, children are uncompressed, if they were already compressed. Also this node is uncompressed, if it had previously been compressed.
|Prefix||Gateway||Number of best paths||Compressed?|
When a node contains only a multicast route.
Route compression is applied to unicast routes only. If a node contains only a multicast route, the compression algorithm is not applied to the node. Therefore multicast nodes are considered as nodes with no best unicast routes as shown in Route Manager‘s Table When a Node Contains Only a Multicast Route.