我有两个直接连接的路由器，它们都有环回地址。接口没有IP地址，我只是将R1 g0/0连接到R5 g0/0。如果我将 IP 地址放在两个路由器的 g0/0 接口上，那么我可以在环回地址之间进行 ping 操作，但是如果我从 g0/0 中删除了 IP 地址，则无法进行 ping 操作。环回是否需要有IP地址的接口才能互相ping通？

R1的sh ip路由

    Gateway of last resort is not set

         10.0.0.0/32 is subnetted, 1 subnets
 C       10.1.1.1/32 is directly connected, Loopback1

R5的sh ip路由

      Gateway of last resort is not set

         10.0.0.0/32 is subnetted, 1 subnets
 C       10.1.1.5/32 is directly connected, Loopback5

运行

       version 15.1
       no service timestamps log datetime msec
       no service timestamps debug datetime msec
       no service password-encryption
       !
       hostname R5
       !
       ip cef
       no ipv6 cef
       !
       license udi pid CISCO2911/K9 sn FTX15246RHB
       !
       spanning-tree mode pvst
       !
       interface Loopback5
        ip address 10.1.1.5 255.255.255.255
       !
       interface GigabitEthernet0/0
        no ip address
        duplex auto
        speed auto
       !
       interface GigabitEthernet0/1
        no ip address
        duplex auto
        speed auto
        shutdown
       !
       interface GigabitEthernet0/2
        no ip address
        duplex auto
        speed auto
        shutdown
       !
       interface Vlan1
        no ip address
        shutdown
       !
       ip classless
       ip route 10.1.1.1 255.255.255.255 GigabitEthernet0/0 
       !
       ip flow-export version 9
       !
       line con 0
       !
       line aux 0
       !
       line vty 0 4
        login
       !
       end