Cisco Switching/Routing :: 4506 - Unable To Recover Password Using Confreg 0x2142?
Dec 31, 2010
I tried the steps mentioned in the links below:
[URL]...
the other similar resolutions on the cisco/other website but none of them works for the Cisco 4506 switch I have.
1. Reboot
2. Press the "CTRL + C" button on the laptop to put the router into ROMMON mode.Result: Works fine and gets into the ROMMON 1 mode.
3. confreg 0x2142Result: This one does not work. confreg=0x2142 and that command is accepted by the switch but it does not tell us that we have to restart to make the changes. Now it goes ROMMON 2 mode.
4. resetResult: I type reset and the switches seems to be power cycled but it again goes to the password prompt which I dont know and this is the password that I am trying to recover or break.
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Dec 7, 2012
I have a cisco 2960 switch. Trying to recover a password. Have tried several different ways to recover it. I have let the switch load completely, then pressing the mode button waiting for the light to turn amber and then green. I also have held the mode button down, plugged the switch back in until the mode light turns from amber to green. Either way I will type flash_init. Then when I type load_helper I get a invalid command response. The command load_helper isn't even listed.
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Nov 25, 2008
Cisco IOS Software, C3750 Software (C3750-IPSERVICES-M), Version 12.2(35)SE5, RELEASE SOFTWARE (fc1)
Copyright (c) 1986-2007 by Cisco Systems, Inc.
Compiled Thu 19-Jul-07 19:15 by nachen
Image text-base: 0x00003000, data-base: 0x01280000
ROM: Bootstrap program is C3750 boot loader
BOOTLDR: C3750 Boot Loader (C3750-HBOOT-M) Version 12.2(25r)SEE4, RELEASE SOFTWARE (fc1)
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Jan 20, 2009
how do i recover username and password for 870 series router
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May 16, 2012
I have one new cisco 2921 router but after first login into the new router . I have made some configuration but forget to change the default password . Now i am unable to login into the router after first log off but iam not able to recover password because the router don't have any external flash memory.
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Aug 30, 2012
I have been saving money to build my ccna voice lab. Recently I bought 2600 and 1700 series routers.One of the 2600 router needed a password recovery so after a refreshing nap i got to work.
During the password recovery procedure, I mistyped confreg 0x1242; by the time I realized my mistake, my computer screen was full of "C" characters Now the whole story is i can not console into it.
Edit:After some research, I found If I use the baud rate 1200 in hyperterminal.i will be able to console into it.When I did that, I noticed that Rommon kept incrementing as:
rommon 1 >
rommon 1 > confreg 0x2142
rommon 2 >
rommon 2 >
rommon 2 >
rommon 2 >
rommon 2 > confreg 0x2142
rommon 3 >
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Apr 5, 2012
I'm been telnetting onto a 2955 and then upgraded the IOS and enabled ssh version 2 and then issues a "write", when I came back the exec-timeout had been issued and I was logged out of the router and now it is asking for a username and password and not just a password liek it did before enabling ssh. I havent yet put a username and password on yet, just the telnet.What would the username be if I havent set one?
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Jan 17, 2013
My management has tasked me to give them a high level overview of the different switching we can choose for our new building.
This is what I know so far.4 Closets, each closet has 450 ports,One MDF room that is will contain one UCS Chassis and a Nimble iSCSI SAN.
I am working on the spreadsheet and it looks like this (Not totally filled):
2960s3560x3750x45064510Approx cost (Each, 48PORT, POE+, 10G uplink, Dual PS, IP BASE)
6K7K8K45K75KMax Capacity192432432192384Backplane speed206464520520ProLeast ExpensiveStackable to 9Stackable to 9ProDual PSDual PSDual PSDual PSDual PSProLayer 3 opt
Layer 3 optDual SupsDual SupsConExpensiveExpensiveConNo Dual PSConLayer 2 OnlyCannot stack more than 4
For the MDF I would like to use 2 Nexus 5548's with FEX's, and the layer 3 daughter board. For the IDF's I was thinking of two 4010's.
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Dec 19, 2011
I am implementing a guest wireless network to work alongside my internal network. The guest network will use the existing switching network and will be separated by VLANs. I have the ASA set so that traffic can get to it and out to the Internet. I can set up a workstation on the same VLAN as my guest network and can route inside my network (strictly doing this for testing purposes). Where I am having problems is with the Catalyst 4506 switches and the ip routing. I had two separate "ip route" statements defined on my switches.
ip route 10.200.2.0 255.255.255.0 10.200.2.254
ip route 0.0.0.0 0.0.0.0 10.100.100.254
I have discovered that the traffic is always following the default route despite the fact that my IP address on my test workstation falls in the 10.200.2.x network. I was looking at documentation and found that it is possible to set up policy-based routing on the core switches. Can you have two "ip route" statements defined like this to segreate traffic or do I have to use PBR for routing (or a combination) in this case? If I define PBR then how does that impact my existing routing? I need to make sure that I can still route the existing traffic while I'm configuring this change.
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Aug 27, 2012
We have 2 sites, each with 2 x 4506 switches which will be connected togther using an etherchannel. The switches will provide access ports for client devices and will be configured with HSRP to provide gateway redundancy. SW1 will be HSRP active.2 metro ethernet links will be installed in each site which will connect back to our HQ sites. OSPF will be used over the backbone to provide resiliency and to allow shortest path routing to each HQ and to prevent traffic over the HQ to HQ link.
The 4506 will be trunked togther with an SVI for providing OSFP adjacency.For the traffic flow from SW2 to HQ2, traffic will hit SW1 and then route back to SW2 and then to HQ2. Is this the best way to do this? Should a second link be connected between switches just for routing or should something like GLBP be used?
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Aug 31, 2012
CiscoSwitch1(4506) has 3 VLANs(12,13,14) and Switch2(4948) has 3 different VLANs(22,23,24) and IP routing has been enabled in both switches with SVI interfaces for each vlan. intervlan routing is works fine.Now there is a requirement to connect these switches together. Vlan 12 on the Cisco switch 4506 has to be made available from vlan 22 from Switch2(4948). basically Vlan 12 is having a multicast source (225.0.0.0 & 226.0.0.0) which should be accessabile from vlan 22 of cisco switch 4948.I got 2 ideas
1) Create a trunk between these switches and configure L2 vlan(12) in cisco 4948...i know theoritically it should work but what my concern is Ip routing enabled in both switches will it create any issues? is it a gud solution to this requirement?
2) Create a separate IP network on the ports connecting to both switches and set up routes to the networks.ex- console(config)#ip route 192.168.10.10 255.255.255.0 192.168.20.1.
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Mar 8, 2013
I am configuring multicast in a environment where I have a 4506 at each site (4 total) and a 6506 as the core. Each 4506 is connected via layer 3 to the 6506. I have a mix of 3560s, 3548s, and 2960s connected to the 4506s and the 6506 via layer 2 trunk
I have multiple multicast sources and hosts communicating at a time (multiple cameras sending video / multiple computers receiving video). So this is not a scenario where there is 1 sender and many receivers. This would be many senders (~50) and some receivers (~10)
Sample Diagram:
->3560
|
6506 --> 4506 --> 3548
| |
| --> 2960
|
4506 --> 2960
|
-->3548
I configured ip multicast-routing on each of the 4506s and on the 6506. IGMP snooping is on by default on the 3560 and 2960 switches. CGMP is on by default on the 3548 switches.
I set up PIM sparse-dense mode and IGMP version 3 on each of the layer 3 interfaces for the 4506s and 6506 where they connect and on each VLAN that is sending or receiving multicast. Multicast is working throughout the network, however I am looking to verify the configuration as I scale this out to more clients on the network.
#1 - Is it correct to us sparse-dense mode in this configuration?
#2 - Do I need to configure a rendezvous points using AUTO-RP? (ip pim send-rp-announce INTERFACE scope TTL). Not sure here if I need to designate this and what to choose. Right now I do not have this and it is working, but documentation seems to infer that I need to designate this.
#3 - Is there any other configuration settings I should be considering? I hard to find real world configurations of multicast as examples or people that know multicast routing well.
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Jan 8, 2013
In an attempt to restore a Cisco IOS I deleted the file C2960-lanbasek9-mz.122-53.SE2.bin my swich
Before deleting the same was as follows:Directory of flash :/
3-rwx 12824 Mar 28 1993 21:00:37 -03:00 vlan.dat4-rwx 3096 Mar 7 2012 08:43:37 -02:00 multiple-fs5-rwx 2289 Mar 7 2012 08:43:37 -02:00 private-config.text6-rwx 7482 Mar 7 2012 08:43:37 -02:00 config.text9 drwx 192 Mar 23 2012 16:18:54 -03:00 C2960-lanbasek9-mz.122-53.SE2
32514048 bytes total (20204544 bytes free)Switch-01 #
Right now this switch as follows:
switch: dir flash:Directory of flash:/
2 drwx 64 <date> crashinfo_ext 3 -rwx 4120 <date> multiple-fs 5 -rwx 12824 <date> vlan.dat 6 -rwx 4018 <date>
[Code].....
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Mar 2, 2012
on IOS versions higher than 12.2(50) on Cisco 3560G-48TS I get this error/traceback, when I reach a certain number of Access-lists group'ed to "interface vlan", and the ACL inserted in the TCAM reaches acl label #128 (can be seen with : Show platform acl label 128)I can see errors in the TCAM if I issue the command
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Oct 4, 2011
I need to know if there is a password recovery procedure on a switch ESW 520
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May 3, 2012
need to recover lost password
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Oct 28, 2012
network Password is rejected as wrong in trying to add another appliance to it. Please confirm the password you have on file
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Jan 4, 2013
I am currently running a 4506 with a sup V engine. I have purchased a sup 7 engine. Is there a guide on how to perform this task. I am sure I need to do an IOS update as well.
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Dec 6, 2012
We have sup engine 6L(WS-X45-SUP6L-E) on two 4506 switch. both switches connected in LAN (HSRP primary and Secondary).
We are going to replace it with Sup7LE. What is the best procedure to get this done with minimal outage?Any other important thing to be noted ? Note : We have Lincence for SUP 7LE
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Jun 11, 2012
We are attempting to PXE boot from clients obtaining their DHCP lease information from DHCP pools configured on our 4506. The PXE server, and the client are configured in separate VLANs. We have configured option 66 to point to the PXE server IP address, and the bootfile option to point to the PXE boot configuration filename. On the client side SVI, we also have configured the ip helper-address command to point to the PXE server (which also acts as another DHCP server for redundancy).
The PXE boot continuously fails stating it is unable to find the configuration file. If we remove the DHCP pool from the 4506, and allow the client to receive their DHCP lease info from the secondary server (Windows 2k8 - same server as PXE server), they PXE boot with no issues.
We have no problem obtaining DHCP info, just completion of the PXE process.
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Mar 19, 2013
Does SUP 7E is comatible with IOS? It came with IOS-XE preloaded and there are no IOS software listed under downloads.
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Apr 7, 2012
Yesterday I've faced a Problem that is not letting me boot with the new IOS.
Actually I'm planning upgrade IOS which supports SSH. As part of plan I've downloaded the new IOS image and uploaded via TFTP server to the switch.
After uploading to the switch. I've verified image and MD5 hash also. Everthing is fine. Then after I set the boot variable for the newly uploaded Image.
When I'm rebooting the Device it is not taking the new IOS. It's booting with the OLD image. Even It's not showing any error message while rebooting (ACTIVITY FILE ATTACHED FOR YOUR REFERENCE) I can't take risk by deleting the old IOS.
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May 8, 2013
I have 4506 with below sup, my requirement is to enable netfolw , but as i came to know that it is not supported in this sup, is there any additional option which can be explored to get the netflow working without replacing sup.
Card Type Model
-------------------------------------------------------------+-----------------------
Sup 6-E 10GE (X2), 1000BaseX (SFP) WS-X45-SUP6-E
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Dec 20, 2010
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May 5, 2010
I didn't change the one-time password in ISR 2911 and I can't access the CLI or the ROMMON mode
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Mar 9, 2012
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Apr 11, 2013
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Feb 18, 2013
Password recovery switch 2960 that what I am doing and I get fail sll the time?
switch: flash_initInitializing Flash...flashfs[0]: 0 files, 1 directoriesflashfs[0]: 0 orphaned files, 0 orphaned directoriesflashfs[0]: Total bytes: 32514048flashfs[0]: Bytes used: 1024flashfs[0]: Bytes available: 32513024flashfs[0]: flashfs fsck took 9 seconds....done Initializing Flash.Boot Sector Filesystem (bs) installed, fsid: 3Setting console baud rate to 9600.(code)
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Apr 26, 2011
l have my term server 2511 and l was tryng to recovery the password but at the rommon mode, l cannot have any access even when l do confreg 0x2142
He brings me tho this: transaction "CONFREG' domaine server (172.16.15.30) (172.44.244.10) (172.244.15.17).
What those this mean. l when to all process still cannot do this.
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Apr 4, 2013
I couldn't recover my password so I just created a new account.I just recently bought the ASUS RT-N16 since I switched to a different ISP that provided only a modem.
The problem: Some computers in the house will connect no problem to the network and without trouble. Other computers will be able to connect to the network but it will be restricted. When you go to the internet browser it shows an Asus logo and says: "the cable for ethernet is not plugged in". All the computers are wireless and in fact I am writing this while connected to the RT-N16 (wirelessly). Also, sometimes a computer will boot, I will go into the browser, it will show me that message, I unplug the RT-N16, plug it back in and the internet works again. This happens everyday.
P.S. I would also like to note that I tried connecting to the internet network with a nexus and it showed me the same error while I tried connecting with a samsung galaxy S2 and everything worked just fine. Also we got like 5 computers at home and I'd say 1 computer always connects fine, some don't connect regardless of whether you restart the router or not and some computers work only when you restart the router so I have very mixed feelings about this one...
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Jan 1, 2012
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