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.
Route Manager‘s Table When There is No Best Route for a Node
| Prefix | Gateway | Number of best paths | Compressed? |
|---|---|---|---|
| 192.0.0.0/8 | 10.203.174.68 | 1 | No |
| 192.168.0.0/16 | 10.203.174.68 | 0 | No |
| 192.168.224.0/24 | 10.203.174.68 | 1 | No |
| 192.168.225.0/24 | 10.203.174.68 | 1 | No |
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.
Route Manager‘s Table When a Node Contains Only a Multicast Route
| Prefix | Gateway | Unicast/Multicast | Compressed? |
|---|---|---|---|
| 192.0.0.0/8 | 10.203.174.68 | Unicast Route | No |
| 192.168.0.0/16 | 10.203.174.68 | Multicast Route | No |
| 192.168.224.0/24 | 10.203.174.68 | Unicast Route | No |
| 192.168.225.0/24 | 10.203.174.68 | Unicast Route | No |
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