第9章 Path MTU机制

图片[1]-第9章 Path MTU机制-大赛人网
图9-1 Path MTU网络拓扑

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

图片[2]-第9章 Path MTU机制-大赛人网
图9-2 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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