在我们的网络中,我们在分支机构中安装了多台 Cisco 1721 路由器,这些路由器通过 T-1 电路与总部连接。所有 1721 都运行相同的 IOS 并进行相同的配置,LAN 接口上具有静态全局 IPv6 地址。以下是相关配置项:
ipv6 unicast-routing
!
interface FastEthernet0
ip address 172.25.22.254 255.255.255.0
no ip proxy-arp
speed auto
ipv6 address 2001:xxxx:xxxx:22::1/64
ipv6 enable
!
interface Serial0
ip address 172.25.7.42 255.255.255.252
no ip proxy-arp
ipv6 enable
no ipv6 nd suppress-ra
priority-group 1
!
ipv6 route ::/0 Serial0
但是我有一个路由器,其 FastEthernet0 接口未正确初始化 IPv6。IPv6 地址处于暂定状态:
FastEthernet0 is up, line protocol is up
IPv6 is enabled, link-local address is FE80::20C:30FF:FE8E:B1F0 [TENTATIVE]
Global unicast address(es):
2001:xxxx:xxxx:22::1, subnet is 2001:xxxx:xxxx:22::/64 [TENTATIVE]
Joined group address(es):
FF02::1
FF02::2
FF02::1:FF8E:B1F0
FF02::1:FF00:1
MTU is 1500 bytes
ICMP error messages limited to one every 100 milliseconds
ICMP redirects are enabled
ND DAD is enabled, number of DAD attempts: 1
ND reachable time is 30000 milliseconds
ND advertised reachable time is 0 milliseconds
ND advertised retransmit interval is 0 milliseconds
ND router advertisements are sent every 200 seconds
ND router advertisements live for 1800 seconds
Hosts use stateless autoconfig for addresses.
什么原因导致这种情况发生?下一步我应该从哪里开始进行故障排除?
我确实尝试过ipv6 nd dad attempts 0
该界面,但没有成功。
答案1
1721 于 2010 年停止了软件支持,当时思科的 CPE 端 IPv6 还很新。遗憾的是,您可能遇到了永远无法修复的 IOS 错误。
如果您的配置相同(版本除外)并且 IOS 版本相同(对启动映像进行校验可能不是一个坏主意)那么如果重新启动没有帮助,您可能很不走运。