This integer, ranging from 0 to 255, sets the administrative distance metric applied to routes accepted from neighbors matched by the associated access list. An admin uses this to make DVMRP prefer or deprioritize routes learned from specific neighbor groups when computing distance vectors, similar to route preference tuning in other routing protocols. Leaving it at the default of 1 gives filtered neighbor routes the highest preference, while raising it to 10 would make the router favor routes from other sources instead.