Configuring 802.1Q Trunking Between a Catalyst 3550/3560/3750 and Catalyst Switches That Run Cisco IOS Software

sungf · ‎12-03-2021

具体故障现象

vss 4500x 与 ws-c3750 stack 通过两条trunk链路互连，3750stack 由3750G-48ts 3750G-12TS,3750E-48ts组成，一条10G，一条1G，通过生成树协议基于vlan阻断一条链路，设备正常运行很长时间，现出现，4500x和3750上部份三层vlan接口不通，实际vlan是1111,现象是4500上arp 表老化后刷新不成功，造成4500回包异常，经过对vlan1110到1130测试，同样IP地址，vlan 1110 1112 1115 1116 1121 1126 1129不通,vlan 1113 1114 1117 1118 1119 1120 1122 1123 1124 1125 1127 1128 1130 通。另测试在3750后有另外一台3750，在其上配置所有 vlan（1110-1130）都是通的，所有3750软件版本一样。已试过把流量从10G链路转到1G链路上，现象不变。设备没有重启测试。

软件版本

Cisco IOS Software, C3750E Software (C3750E-UNIVERSALK9-M), Version 12.2(44)SE1, RELEASE SOFTWARE (fc1)
Copyright (c) 1986-2008 by Cisco Systems, Inc.
Compiled Thu 06-Mar-08 23:37 by weiliu
Image text-base: 0x00003000, data-base: 0x02000000

Cisco IOS Software, IOS-XE Software, Catalyst 4500 L3 Switch Software (cat4500e-UNIVERSALK9-M), Version 03.11.04.E RELEASE SOFTWARE (fc2)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2021 by Cisco Systems, Inc.
Compiled Mon 08-Mar-21 15:37 by prod_rel_team

scrabblelives · ‎02-16-2022

From what I can understand it seems like there is still some information missing from what you have provided about the situation. It would be helpful to know what the configurations are your trunks are as well as your vtp domains and modes. I would suggest you look at some of these guides: