問題文
A prefix is withdrawn and then announced again during one round of BGP measurement, and the team wants to read the three BGP metrics correctly. What do the definitions state?
選択肢
- Reachability is the share of a 15-minute round in which the monitor held a route to the prefix, that withdrawal and re-announcement count as 1 path change, and updates are at least as many as changes.
- Reachability is the share of a 60-minute round in which the monitor held a route to the prefix, that withdrawal and re-announcement count as 2 path changes, and updates match them exactly.
- Reachability is the share of a 15-minute round in which the monitor held a route to the prefix, that withdrawal and re-announcement count as 2 path changes, and updates are at most as many as those.
- Reachability is the share of a 15-minute round in which the monitor held a route to the prefix, that withdrawal and re-announcement count as 2 path changes, and updates stay at or above the count of path changes.