跳到主要內容

Cisco Switch 密碼還原

手上的Cisco 2950 Switch設了密碼,猜了半天也進不去,重開後按Ctrl+Break也無反應,還在懷疑是不是線壞掉的時候,Google了一下.....原來Switch密碼還原和Router完全不同

1. 按住Switch上的Mode鍵,並將Switch開機


2.此時Switch會出現以下訊息,紅字為輸入的文字
C2950 Boot Loader (C2950-HBOOT-M) Version 12.1(11r)EA1, RELEASE SOFTWARE (fc1)
Compiled Mon 22-Jul-02 18:57 by antonino
WS-C2950-24 starting...
Base ethernet MAC Address: 00:0a:8a:c0:52:80
Xmodem file system is available.

The system has been interrupted prior to initializing the
flash filesystem.  The following commands will initialize
the flash filesystem, and finish loading the operating
system software:

    flash_init
    load_helper
    boot

switch: flash_init
Initializing Flash...
flashfs[0]: 326 files, 5 directories
flashfs[0]: 0 orphaned files, 0 orphaned directories
flashfs[0]: Total bytes: 7741440
flashfs[0]: Bytes used: 5598208
flashfs[0]: Bytes available: 2143232
flashfs[0]: flashfs fsck took 8 seconds.
...done initializing flash.
Boot Sector Filesystem (bs:) installed, fsid: 3
Parameter Block Filesystem (pb:) installed, fsid: 4
switch: load_helper
switch: rename flash:config.text flash:config.old
switch: boot



詳細方法可以參考官方網站

留言

這個網誌中的熱門文章

使用Cisco L3 Switch做VLAN的Routing

目標: 讓VLAN100與VLAN200的電腦透過L3 Swtich做VLAN的Routing,並且可以互相存取資源與上網,另外再使用Windows Server 2012配發VLAN100,VLAN200的IP Firewall: 使用ASUS AP當Firewall,並設兩條Static Route Switch: Core Switch為Cisco 3750切VLAN 10,VLAN100,VLAN200,VLAN10為預設的VLAN,VLAN100為Sales,VLAN200為RD Edge Switch為Cisco 3750與2950,其中2950為VLAN100,3750為VLAN200,如果要By Port切VLAN也可以,這裡只是為了方便說明,所以Edge Switch都直接設為單一VLAN Core Switch的設定 原本我只想Show Running-config其中比較重要的設定,後來想想還是全部列出,用紅色標記重要的設定 Gi 1/0/1接2950 Gi 1/0/2接3750 Gi 1/0/24接Router Core-3750#show running-config Building configuration... Current configuration : 2436 bytes ! version 12.2 no service pad service timestamps debug datetime msec service timestamps log datetime msec no service password-encryption ! hostname Core-3750 ! boot-start-marker boot-end-marker ! ! ! ! no aaa new-model switch 1 provision ws-c3750g-24t system mtu routing 1546 ip routing no ip domain-lookup ! ! ! ! ! ! ! ! spanning-tree mode pvst spanning-tree portfas...

Cisco Switch 發生Loopback

User告知網路無法使用,看了Switch的狀況後,發現那個Port的狀態是Error Disable,接著又看了Switch的log Feb  8 12:14:14 TW: %DHCP_SNOOPING-5-DHCP_SNOOPING_UNTRUSTED_PORT: DHCP_SNOOPING drop message on untrusted port, message type: DHCPNAK, MAC sa: 2c56.dc86.xxxx Feb  8 12:15:49 TW: %DHCP_SNOOPING-5-DHCP_SNOOPING_UNTRUSTED_PORT: DHCP_SNOOPING drop message on untrusted port, message type: DHCPNAK, MAC sa: 2c56.dc86.xxxx Feb  8 12:18:00 TW: %ETHCNTR-3-LOOP_BACK_DETECTED: Keepalive packet loop-back detected on FastEthernet0/10. Feb  8 12:18:00 TW: %PM-4-ERR_DISABLE: loopback error detected on Fa0/10, putting Fa0/10 in err-disable state Feb  8 12:18:01 TW: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/10, changed state to down Feb  8 12:18:02 TW: %LINK-3-UPDOWN: Interface FastEthernet0/10, changed state to down 應該是User私接設備,除了造成Loopback之外,又在隨便發放IP....... 不過因為那個User比較特殊,先教育了一下之後,再把那個Port shutdown , no shutdown,接著把Recovery設了上去,下次如果再遇到相同狀況,10分鐘後會自動恢復 xxx...

2台 Vigor 2920建立 LAN To LAN VPN (IPsec)

我有兩台Vigor 2920,環境如下: Vigor B 撥出 LAN:192.168.1.0/24 Vigor A 撥入 LAN:172.16.1.0/24 設定如下: Vigor B設定 Vigor A設定 詳細設定請參考官網 http://www.draytek.com/index.php?option=com_k2&view=item&id=2666&Itemid=264&lang=tw