R2和R3上的配置:
R2(config-if)#int s1/1
R2(config-if)#ipv6 add 2001:1::1/64
R2(config-if)#no sh
R3(config)#int s1/0
R3(config-if)#ipv6 add autoconfig
R3(config-if)#no sh
R3(config)#do sh ipv6 int s1/0
Serial1/0 is up, line protocol is up
IPv6 is enabled, link-local address is FE80::C802:FFF:FEEC:0
No global unicast address is configured (查看到窜口上是无效的因为窜口根本没MAC地址所以 也就没有EUI了,但是窜口有 链路本地地址,借用的是以太口的地址)