MSR路由器接口状态是UP而链路层协议显示DOWN的问题

 

MSR路由器

接口状态是UP而链路层协议显示DOWN的问题

 

Q: 现象描述：

为路由器E0/1接口配了IPv6地址后，查看接口状态，显示接口当前状态为UP，而链路层协议状态为DOWN。信息显示如下：

[RTB-AR29-01-Ethernet0/1]display ipv6 interface Ethernet 0/1

Ethernet0/1 current state :UP

Line protocol current state :DOWN

IPv6 is enabled, link-local address is FE80::20F:E2FF:FE3D:59BE [TENTATIVE]

  Global unicast address(es):

    2::1, subnet is 2::/64 [TENTATIVE]

  Joined group address(es):

    FF02::1:FF00:1

    FF02::1:FF3D:59BE

    FF02::2

    FF02::1

  MTU is 1500 bytes

  ND DAD is enabled, number of DAD attempts: 1

  ND reachable time is 30000 milliseconds

  ND retransmit interval is 1000 milliseconds

  Hosts use stateless autoconfig for addresses

 

A: 原因分析：

    只在接口下配了IPv6地址，而没有在全局视图下使能IPv6协议。

   排除方法：

    在系统视图下输入如下命令：

    [h3c]ipv6

    再此查看接口信息：

    [RTB-AR29-01-Ethernet0/1]display ipv6 interface Ethernet 0/1

Ethernet0/1 current state :UP

Line protocol current state : UP

IPv6 is enabled, link-local address is FE80::20F:E2FF:FE3D:59BE [TENTATIVE]

  Global unicast address(es):

    2::1, subnet is 2::/64 [TENTATIVE]

  Joined group address(es):

    FF02::1:FF00:1

    FF02::1:FF3D:59BE

    FF02::2

    FF02::1

  MTU is 1500 bytes

  ND DAD is enabled, number of DAD attempts: 1

  ND reachable time is 30000 milliseconds

  ND retransmit interval is 1000 milliseconds

  Hosts use stateless autoconfig for addresses