Hot Downloads

Welcome, Guest
Username: Password: Remember me

TOPIC: Catalyst 2960G - Vlan Keep Changing

Catalyst 2960G - Vlan Keep Changing 7 years 2 weeks ago #32690

  • apit
  • apit's Avatar
  • Offline
  • Senior Member
  • Posts: 227
  • Karma: 0
Hi..

I have about 50 unit cisco access switch model Catalyst 2960G...Details for the IOS as below :

Cisco IOS Software, C2960 Software (C2960-LANBASE-M), Version 12.2(35)SE5, RELEASE SOFTWARE (fc1)
Copyright (c) 1986-2007 by Cisco Systems, Inc.
Compiled Thu 19-Jul-07 20:06 by nachen
Image text-base: 0x00003000, data-base: 0x00D40000

ROM: Bootstrap program is C2960 boot loader
BOOTLDR: C2960 Boot Loader (C2960-HBOOT-M) Version 12.2(25r)SEE6, RELEASE SOFTWARE (fc1)

The problem was :

- 1 unit of the switch automatically change it port vlan ; from switch port access mode to trunk mode

- 2 unit of the switch automatically change it's vlan ID(400) to the old ID (140).

Security Part :

- All the switches is protected with password
- Only 1 pc(IP) is allowed to telnet to all the switches. Others IP is blocked by the ACL.

Switch Uptime :

- The switch uptime is more than 1 month and the problem occur last 2 days. All the switch configuration have been save after change to new vlan ID.

Need advice from all of you guys..

Thanks
The administrator has disabled public write access.

Re: Catalyst 2960G - Vlan Keep Changing 7 years 2 weeks ago #32695

  • hades
  • hades's Avatar
  • Offline
  • Frequent Member
  • Posts: 31
  • Karma: 0
did u try to turn DTP off by using "switchport nonegotiate" command coz some internetworking devices might forward DTP frames improperly, which cause misconfigurations.
I think therefore I am!
The administrator has disabled public write access.
Time to create page: 0.075 seconds

CCENT/CCNA

Cisco Routers

  • SSL WebVPN
  • Securing Routers
  • Policy Based Routing
  • Router on-a-Stick

VPN Security

  • Understand DMVPN
  • GRE/IPSec Configuration
  • Site-to-Site IPSec VPN
  • IPSec Modes

Cisco Help

  • VPN Client Windows 8
  • VPN Client Windows 7
  • CCP Display Problem
  • Cisco Support App.

Windows 2012

  • New Features
  • Licensing
  • Hyper-V / VDI
  • Install Hyper-V

Linux

  • File Permissions
  • Webmin
  • Groups - Users
  • Samba Setup