Routing Information Field
Routing information is stored in the header of token ring frames in the RIF.
+---------------+------------------+------------------+------
| Route Control | Route Designator | Route Designator | ...
+---------------+------------------+------------------+------
| |
| |
| |
V |
|
+-----------+--------+-----------+---------------+ |
| Broadcast | Length | Direction | Largest Frame | |
+-----------+--------+-----------+---------------+ |
| | |
| | |
| | |
| | V
| | +----------+------------+
| | | Ring Num | Bridge Num |
| | +----------+------------+
V |
+-----+-----------------------+ |
| 000 | Specific Rout | |
+-----+-----------------------+ |
| 100 | All Routes Broadcast | |
+-----+-----------------------+ |
| 110 | Single Route Broadcast| |
+-----+-----------------------+ |
|
V
+------------------+----+-----------------------+
|Largest Frame Size| MTU| Max IP datagrame Size |
+------------------+----+-----------------------+
| 000 | 552| 508 |
+------------------+----+-----------------------+
| 001 |1064| 1020 |
+------------------+----+-----------------------+
| 010 |2088| 2044 |
+------------------+----+-----------------------+
| 011 |4136| 4092 |
+------------------+----+-----------------------+
| 100 |8232| 8188 |
+------------------+----+-----------------------+