Path is the type of path, as follows:
EXT1 Autonomous system (AS) external path, of type 1.
EXT2 Autonomous system (AS) external path, of type 2.
INTER Inter-area path, to destinations in other areas.
INTRA Intra-area path, to destinations on one of the router’s
attached areas.
Next hop lists the next hop to the destination.
Advrtr lists, for inter-area and autonomous system external paths,
the router ID of the router advertising the summary link or AS
external link leading to this path.
Using the Network Control Language
Managing the Open Shortest Path First Protocol
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