Version 6.8 47 Mediant MSBR
Configuration Guide 9. Manipulating the Routing Table
9 Manipulating the Routing Table
MSBR’s routing table contains the “best” routes the device is familiar with to known
destinations; however, how does it decide which route is the better route to a destination?
MSBR starts by examining the prefixes and prefix lengths. The same prefixes, however
with different prefix lengths are considered as different destinations, and as a rule, the most
specific prefix always “wins” in a tie. Next, for destinations with the same prefixes and
prefix lengths, the decision is made according to the lower Administrative Distance (AD) of
the protocol it was learned from. Next, if there are two routes with similar AD, the one with
the lower metric wins. The product of this decision process is the “best” route to a specific
network destination.
The parameters which determine the best route are configurable, i.e. a network
administrator can influence of the determination of this route by configuring the AD of the
protocols running on the MSBR (OSPF, RIP, BGP, and Static) and the metrics of the
specific protocols, for example, changing BGP attributes, changing BW for OSPF and,
changing metrics for static routes, etc.).
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