Cisco Switching/Routing :: 3560Gs / 4900Ms / Starting SSH Session From Console Port?
Dec 29, 2011
I console into switch 1 (or router, it doesn't matter) and everything is fine. From that session I SSH to switch 2 (or router). The session on the second device has a noticable delay when I type.Next I SSH to switch 1, then SSH to switch 2 from that session. Everything works fine.Finally, I console to switch 1, and telnet to switch 2. There is no delay.So it appears the delay only occurs when I open an SSH session while consoled into a device. It didn't matter what switch 1 and switch 2 were - I had 3560Gs, 4900Ms and a 3845 router. There's no special configuration on the console or vty ports - when I do a "show line console" and "show line vty 0" the output is basically the same.
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Jun 6, 2012
Need to confirm if this is default behaviour of 4507 with 2 supes.When i console in to standby supe gives message console session is disabled?
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Feb 26, 2012
I was looking for a way to connect an AUX port from a 1700 router to a 6500 switch module console port, to see the output of the Switch's on the 1700 router, in case there is a network downtime, I could see what's going on in the switch, what cable should I use ? Also, is there is any kind of documentation for this type of config what have I seen is very few info.
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Nov 14, 2012
I have Any Connect (ver 3.1.01065) configured on Cisco router 891. VPN is working fine from the desktop, but I also need the ability to establish a VPN connection through a RDP connection (i.e. I'm using RDP to connect to a PC which has AnyConnect installed on, then trying to establish a VPN connection). OS Windows 7 SP1 x86.I've read about changing some settings in profile file (changed the <WindowsVPNEstablishment> option to "AllowRemoteUsers". Then applied the profile to the relevant Group Policy. Connected VPN from the PC (not through RDP), so that it downloads the new profile, and then disconnected again.): url...
But this make sense to the cisco asa... I have a cisco router on the ios 15.1. I've checked the XML file on the local PC to confirm the profile has been downloaded and is has, and I can't see the AllowRemoteUsers option.So I still can't start VPN through an RDP connection. (Error is "VPN establishment capability from a remote desktop is disabled. A VPN connection will not be established".)This also happened with the previous version of AnyConnect (2.5.xxxx).The PC's local routing tables look fine, and I can't see any conflicts that would cause the RDP session to drop.In the main window of Cisco anyconnect secure mobility client Ive noticed label: Web Authentication required.
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May 3, 2013
I attached the terminal to the console port to watch the bootup sequense, but nothing appear the same cable used on athor switches and router without any issue.procedure to access the router noting that Giga ports not working also.
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Jun 9, 2013
I'm setting up a montitor session on a NEXUS 7K as below.we are receiving in 150M of data and 0 data going out port 9/25.but port 4/24 shows 300M to the span port?
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Feb 13, 2013
I have issue with Cisco Router 2801's Console Port. My student was doing a lab and he said during configuration, Console Port stopped responding. He was in middle of configuration, so now at present, only telnet is able to login on "R2>" user mode, enable password is not set, so getting "R2>en % No password set R2>" I have tried different terminal software but no output from Console Port, changed the Console Cables, replace with working console cables, change speed (baud) settings. Also tried to connect same console with "AUX" port and got same error mentioned above. AUX Port responds but I am not able to change mode (R2#) because of incomplete running-config. it seems "Console Port" is physically damaged.
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Dec 11, 2011
I have 2 Catalyst 2924 switch in a home lab. Both of them have developed the same problem at the same time (strange). I have tried all that I can think of. I can telnet to them but cannot access via the console port. On a telnet session I execueted a "write erase, reload" on one of them. As I anticipated this threw me out of the telnet session and I presently have no access to that switch.
The console cable is fine, works for all other devices.
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Mar 12, 2012
I have a strange issue that I am having an issue figuring out. I am trying to login to the 1941 router through the console port. When I enter the username and password, which I just set, it fails. I am able to login under a different login but when I try to enter the enable mode the enable password doesn't work, which I just set as well. I can login with the TACACS+ login from a SSH session. Here is the line config:
line con 0
exec-timeout 15 0
logging synchronous
[Code].....
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Jan 19, 2012
What key sequence to go into ROMMON mode from the console port for VSS system with 2 VS-S720-10G?
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May 20, 2013
I have cisco 2651. It contains two FastEthernet interfaces: Fa0/0, Fa0/1.Fa0/1 has an ip address. Fa0/0 hasn't an ip address.I need to create monitor session from source Fa0/1 to destination Fa0/0. Then i want to connect my notebook to Fa0/0 to analyze some traffic from port Fa0/1
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Apr 17, 2013
If I monitor a trunkport on the rootbridge in both directions I get Duplicate Multicast Packets on the perticular VLAN. The first guess is, that this is worked as designed and not a IOS Bug (Platform CAT6500 SUP720 IOS 12.2(33)SXI9 ) Until know I only found an old Cisco press link from 2002 with this subject.
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Jan 11, 2012
I not able to access cisco 2811 router (AC operated) through console port when I try to access it by selecting COM Port, but I able to access by selecting the TCP/IP option.
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Oct 28, 2012
I have one Catalyst 6509E chassis and two SUP720. The bootup sequence on SUP 720 (standby hot) failed . Messages that appear on SUP 720, on the console port indicate o software crash. I don't have a flash card in SUP720.
This is the bootup process:
System Bootstrap, Version 8.5(3)
Copyright (c) 1994-2008 by cisco Systems, Inc.
Cat6k-Sup720/SP processor with 1048576 Kbytes of main memory
[code].....
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Jan 21, 2013
I have installed Cisco 2955 Switch which already have x.x.x.x EA12 IOS and I copied x.x.x.x.EA13 into the flash: with intention to have EA13 enabled for IOS. I set the Global config for boot system by 'boot system (no falsh)x.x.EA13;x.x.EA12' but then also no luck and was showing EA12 in 'sh ver'. I then deleted the EA12 IOS and set the 'boot system flash:x.x.EA13'. I also had varified IOS EA13 by 'verify flash:IOS Filename', it verified the IOS.
But when I reloaded my switch, I'm unable to login and its in 'switch:' prompt (ROMmon mode - I believe). I then tried for flash_init, load_helper, dir flash: (showing me EA13 there) and finally boot flash:IOS Image file but no good news here... Output like this
Error loading "flash:IOS Image File EA13" Interrupt within 5 seconds to abort boot process. Error loading "flash:c2950-i6q4l2-mz.121-12c.EA1.bin"Interrupt within 5 seconds to abort boot process.
My guessing is that the IOS is corrupted (but its not showing me Error loading Image blabla...) I'm trying with EA14 of 4MB and I have 3 MB free spare and decided to remove EA13 first then through XModem try to upload EA14.
Any useful way and recommend me deleting EA13 and upgrading EA14... Also option to set boot image with having two IOS at the same time for permanent use.
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Aug 30, 2012
I will use function of span in sup70-3b.How many session can use in sup720-3b? For example, 2 or 4 session.
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Jul 12, 2012
I have a need to capture some traffic but my core 6513's are already using the limit of 2 span sessions. I can't edit any of the sessions either because I want to source traffic from vlans and you can only do one or the other. Is using a VACL with 'switchport capture' on the destination interface an option ? E.g. I want to source traffic from vlan 10,20,30,40 and send the all to interface Gi10/10 ? Is there any caveats ? I dont need to be too granular with the ACL's but just capture all traffic in those vlans.
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Aug 20, 2012
i have just set up a monitor session with a 3750 stack .Simple enough task you would think.But i only seem to be seeing broadcast packets !!Now there is definitely unicast traffic being used on the host i am monitoring.I have done the basic commands
-monitor session 1 dest int fas 5/0/24
-monitor session 1 src int fas 5/0/34
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Apr 20, 2012
I am having trouble with my Cisco SG300 switch big time. I have two servers with IP addresses 10.17.0.11 and 10.17.0.29 sitting on the same switch which is a Cisco SG300. I initiate a file transfer from 10.17.0.11 to 10.17.0.29. I could see lots of Dup Acks and retransmissions which means something is wrong in the connection. Further, I could see the session initiation a bit bizarre. I could see two SYN packets sent from 10.17.0.11 to 10.17.0.29 and also two SYN ACK packets returned by 10.17.0.29. The switch forms part of a network but since both the servers are sitting on the same switch I suppose the rest of the network doesn't come into play when one server talks to the other.
See also the number of Dup Acks and retransmissions. The two switch ports connecting the servers have speed and duplex set to auto negotiate, flow control is enabled. What could cause this sort of problem?Could it be any setting on the switch or the servers' NICs?Or could it be a bad switch that causes this?
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Aug 9, 2012
I have a 6513 with redundant sup 720-3B's that I cannot get onto. In short, one of the power supplies failed, it still passes traffic but I can't console or ssh to the box. Other than the two sup 720's, I have a 4 port 10gig card, a 16 port GBIC Card and an IDS module. I have tried removing the 10Gig, IDS and one of the sup's but still don't get anything on the console. I have rebooted the entire chassis and don't get anything on my console while booting. I have tried changing the speed of my terminal to every setting available incase someone has changed it at some stage but to no avail. I have tried swapping sup's, using only one at a time in the chassis but not getting anything. Is there anything else I can try to get onto this chassis? The power supply is a 3000w with a 32amp input. The failed power supply had tripped a switch, when i brought it back up, the power supply came out but the output failed LED is on. My #questions are, is there anything else I can do to try get onto the console, and is the power supply goosed when the RED LED is lit? I have reseated the power supply also but the same result.
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May 30, 2012
I purchased an old cisco 831 for practical studies for a cisco certification. I purchased the console cable (serial/rj45) and a usb->serial converter cable. However when I open my terminal application (tera term) After I select the right com port (3) and make sure the connection settings are right. It will just sit idle and not show any data from the device. Was I sold a faulty device? It lights up and has three lights on.
Everytime I look at a manual or cisco video I am given the impression the terminal application will just automatically connect. But whenever I try I get nothing.
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Jan 4, 2012
i have 2811 router and i am coneccted via concole so i want to copy the 2811 ios to my PC is that possible?
how or give my the right decument to do this.
* idon't want to use TFTP becuse i have no ethernet connection to the router(only concole)
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May 19, 2013
I have installed a cisco 2911 router and the cisco usb console drivers on my pc, win 7 64 bit.however when I use putty and open the com port assigned it just goes blank, I am using the usb port on my laptop to connect and using the cisco usb console cable provided
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Apr 3, 2012
I have a 3560-24ps, and I'm having issues with it booting. When I power the device up all the front panel lights come on like normail, and then the system light starts flashing like normal, but after 5 - 6 seconds the system light goes off. I don't get any output from the console, and the fans still run.
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Nov 2, 2011
I am seeing the following behavior when computers move from one switch to another with dot1x ONLY when there is a 'stupid' switch in between.
computer -------- 'stupid' switch ------- 2960
dot1x is working fine but when the computer is disconnected, the port still shows the authentication session id so when the computer connects to another port or switch, authentication succeeds but traffic doesn't pass. While I'm almost certain that the culprit is the 'stupid' switch that doesn't clear the session id, I have already tried another one and the problem remains so I'm actually just asking for a confirmation that all these 'stupid' switches present this behavior and if there is a workaround in this case.
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May 17, 2012
I'm dealing with a 4506 switch that whn I try to apply "sh auth sess int xx" I get "Invalid Input Detected" ... Is there any way that I can get the authenticated session over a port even if I can't apply "sh auth sess int"?
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Mar 6, 2013
I tried to clear monitor session on 6500 and keep on getting the following error:
%Another session parameters or permit-list is being configured %Please wait for another configuration to complete.
how i can go about clearing the monitor session.
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Jun 9, 2012
On 2921, how do you quite service-module session and get back to the router?
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Nov 21, 2011
I tried to clear monitor session on 6500 and keep on getting the following error:
%Another session parameters or permit-list is being configured %Please wait for another configuration to complete.
how i can go about clearing the monitor session.
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Mar 3, 2013
rsbd7k01-p-vdca(config)# monitor session 2
rsbd7k01-p-vdca(config-monitor)# source vlan ?
<1-3967>
rsbd7k01-p-vdca(config-monitor)# source vlan 1 - 3967
ERROR: vlan 33-3967: Number of source vlans exceeds maximum
rsbd7k01-p-vdca(config-monitor)#
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Jun 12, 2013
I cannot connect to the Cisco 2801 with console cable. what to do ?
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Jun 11, 2013
I have two 3560s that i would like to upgrade. But first i would like to make -absolutely- sure i dont wind up in a situation where i have to roll back over a console connection.to the day i still cant understand why oh why someone removed (or chose not to implement it everywhere) tftpdnld from rommon ;)
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Dec 16, 2012
Is there a way to turn off 802.1x authentication messages to the console of a 3750 switch? The issue we have is that we like to monitor the terminal when remotely configuring our switches. However, every time a computer authenticates to the network we get messages and sometimes quite a few depending on the situation.
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