dis fib结果的Flag：F：FRR是快速重路由的意思吗？有没有Flag是F的rib例子呢？

<Sysname> display fib vpn-instance vpn1

Destination count: 8 FIB entry count: 8

Flag:

  U:Useable   G:Gateway   H:Host   B:Blackhole   D:Dynamic   S:Static

  R:Relay     F:FRR

Destination/Mask   Nexthop         Flag     OutInterface/Token       Label

0.0.0.0/32         127.0.0.1       UH       InLoop0                  Null

20.20.20.0/24      20.20.20.25     U        GE2/0/1                  Null

20.20.20.0/32      20.20.20.25     UBH      GE2/0/1                  Null

20.20.20.25/32     127.0.0.1       UH       InLoop0                  Null

20.20.20.25/32     20.20.20.25     H        GE2/0/1                  Null

20.20.20.255/32    20.20.20.25     UBH      GE2/0/1                  Null

30.30.30.0/24      30.30.30.30     U        GE2/0/2                  Null

30.30.30.0/32      30.30.30.30     UBH      GE2/0/2                  Null

# 显示目的地址为10.2.1.1的FIB表项的信息。

<Sysname> display fib 10.2.1.1

Destination count: 1 FIB entry count: 1

Flag:

  U:Useable   G:Gateway   H:Host   B:Blackhole   D:Dynamic   S:Static

  R:Relay     F:FRR

Destination/Mask   Nexthop         Flag     OutInterface/Token       Label

10.2.1.1/32        127.0.0.1       UH       InLoop0                  Null

表1-1 display fib命令显示信息描述表