9.1 Path MTU机制
1.R1连通性测试PC2,MTU长度为1500byte(数据1452byte+IPV6基本报头40byte+ICMP报头8byte),不会出现丢包及分片
<R1>ping ipv6 -s 1452 -c 1 2002::1
PING 2002::1 : 1452 data bytes, press CTRL_C to break
Reply from 2002::1
bytes=1452 Sequence=1 hop limit=253 time = 20 ms
--- 2002::1 ping statistics ---
1 packet(s) transmitted
1 packet(s) received
0.00% packet loss
round-trip min/avg/max = 20/20/20 ms
2.抓包
3.R1的G0/0/0口修改MTU值为1400
[R1]interface GigabitEthernet 0/0/0
[R1-GigabitEthernet0/0/0]ipv6 mtu 1400
4.R1连通性测试PC2,发生丢包现象,生存周期结束恢复正常,会被分片
[R1]ping ipv6 -s 1452 -c 1 2002::1
PING 2002::1 : 1452 data bytes, press CTRL_C to break
Request time out
--- 2002::1 ping statistics ---
1 packet(s) transmitted
0 packet(s) received
100.00% packet loss
round-trip min/avg/max = 0/0/0 ms
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