The format of the ASCII routing table dumps is:
prefix/mask T:total A:announces W:withdraws; Attributes ; [Attributes ;]*where total is the total number of time this prefix has been anounced and withdrawn, announces is the total number of times this prefix has been announced, and withdraws is the total number of times the route has been withdrawn. At least one set of Attributes exists for every announced route. Some prefixes may have been announced with several different attributes. The format of Attributes is:
AS_path | Origin | Next_Hop | Local_Pref | Multi_Exit
Click here to see an example of an MRT routing table dump.
RTDUMP is extremely useful for such tasks as collecting HOMEAS information and anyalyzing route flapping. For example, Merit has been monitoring route flapping on the NSFnet by piping the output from the sbgp program into rtdump. Once a week, a cron job runs a perl script that gives the rtdump process a HUP signal and then collects the output.
sbgp -bo stdout | rtdump -i stdin -o /tmp/rt_data
Please see the manual page rtdump(1) for a complete description of the use and features of this program.