After I run the display fib command, what does flag mean in the command output

Currently, Flag can have the following values:

  • B: a blackhole route, that is, a route with the outbound interface NULL0.
  • D: a route generated by a dynamic routing protocol such as Intermediate System to Intermediate System routing protocol (IS-IS), open shortest path first (OSPF), Border Gateway Protocol (BGP), or Routing Information Protocol (RIP).
  • G: a gateway route, that is, a route with a gateway as the destination address.
  • H: a host route.
  • S: a static route, that is, a route configured using the ip route-static command or configured on the network management system (NMS).
  • U: a route that is reachable.

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