NE40E-X3V600R001C00SPC800ISIS邻居建立失败

发布时间:  2017-05-20 浏览次数:  139 下载次数:  0
问题描述

NE40E-X3与NE40E-X16ISIS邻居建立失败
<NE40E-X3>display isis peer

                          Peer information for ISIS(1)

  System Id     Interface          Circuit Id       State HoldTime Type     PRI
-------------------------------------------------------------------------------
BJ-BJHXW-AR04-N Eth-Trunk0         BJ-BJHXW-AR04-NE4 Up   299s     L2       64
E40E-X3                            0E-X3.01                                   
BJ-BJDDS-CR01-N GE1/0/0            ---               Init 58s      L2       64
E40E-X16 
Total Peer(s): 2

处理过程

查看ISIS进程1的error信息

Longer packet有大量计数
查看接口信息:
<NE40E-X3>display cu interface GigabitEthernet1/0/0
#
interface GigabitEthernet1/0/0
mtu 1512
ip address x.x.x.42 255.255.255.252
isis enable 1
isis circuit-level level-2
isis cost 200 level-2
#
<NE40EX-16>display cu interface GigabitEthernet2/3/0
#
interface GigabitEthernet2/3/0
ip address x.x.x.41 255.255.255.252
isis enable 1
isis circuit-level level-2
isis cost 200 level-2
#

根因

ISIS会根据接口配置的MTU值来向外发送hello报文。两边MTU不一致,会导致ISIS邻居建立不起来。

解决方案

将NE40E-X3的GigabitEthernet1/0/0接口 MTU修改为1500
[NE40E-X3- GigabitEthernet1/0/0]MTU 1500
[NE40E-X3- GigabitEthernet1/0/0]undo MTU  //接口默认的MTU 为1500
[NE40E-X3- GigabitEthernet1/0/0]restart   //修改MTU后需要重启端口才能生效

END