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Questions tagged [cisco]

Cisco is a provider of switches and routers to commercial consumers. Cisco devices run IOS or NX-OS operating systems. This is a generic tag to be used when no more specific tags are available. See the partial list of tags in the full Tag Wiki.

Cisco is a provider of switches and routers to many medium and large companies. Cisco devices often run IOS or NX-OS operating systems.

Since Cisco acquisition of Linksys, the consumer line of switches, firewalls and routers (which do NOT run IOS) have been rebranded under the Cisco name.

This tag is a generic tag - Wherever possible a more specific tag related to the product you are using should be used instead. For example:

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2634 questions
14
votes
6 answers

Code to generate Cisco "secret" password hashes?

Does anyone have a pointer to code (or just the algorithm) that Cisco uses to generate their password hashes for things like "enable secret"? I'm not trying to break into anything; I'm trying to generate the appropriate "enable secret" line given…
Brent Chapman
  • 351
5
votes
5 answers

Is there a Cisco IOS Virtual Appliance?

Need to do test configurations on (unfamiliar) Cisco/IOS equipment. Is there a virtual machine I can light up and use it in my test environment as a real firewall/edge/core router?
gravyface
  • 13,987
4
votes
3 answers

On a Cisco switch, how do I see the difference between current VLAN settings and those that have been written to memory?

If a switch gets rebooted and the settings haven't been "wr"d, when it comes back up things will be all wrong. I want to see what the current vlan settings are vs what has been "wr"d. Thanks!! Edit: Er... I meant like the difference between…
cat pants
  • 2,293
4
votes
2 answers

Fast Ethernet module for Cisco 2620

I have a Cisco 2620 Router. It comes with one fast ethernet port built in (circled in red), and one old AUI ethernet module is installed (circled in blue). I figure I can put a transceiver on the AUI interface to get a second RJ45 connector. What…
Kenny Rasschaert
  • 9,095
4
votes
4 answers

Cisco Get Current Interface Throughput

I can graph a device interface with SNMP tools, platforms like Cacti even make pretty graphs, but these are based on polling intervals (typically, every 5 minutes). I can use the CLI; r1>show int gi0/0 GigabitEthernet0/0 is up, line protocol is up…
Baldrick
  • 4,242
3
votes
1 answer

Is 208v output likely to cause issues in a Cisco switchbwith PSU rated for 220-240v input?

I’m a net/sysadmin. I had a Cisco switch chassis (4510) with 6000W PSUs go down due to both PSU faulting. Each PSU has one connection each to facility power and an APC UPS outputting 208v. The switch’s logs are uninformative except for a few power…
pants_towel
  • 61
3
votes
0 answers

Unknown root user on Cisco 1921 router

Just a moment ago I ran the who command on my router and I noticed myself logged in on vty 1 but another user root was on vty 0. The Location under that user is some location I do not know (someone from klayer.com). But the strange thing is that I…
ojs
  • 170
3
votes
1 answer

password required, but none set

I'm configuring a stack of new Cayalyst 2960-X Series switches, and I'm struggling with the following warning: password required, but none set I configured the switch to authenticate against our tacacs-server, and that is working just fine. Upon…
kubiej21
  • 289
3
votes
1 answer

How to stop ISDN to connect automatically

Below is my BRI and interface configuration interface BRI0 ip address x.x.x.x xx.xx.xx.xx ip pim dense-mode encapsulation ppp ip igmp join-group 227.0.0.122 ip igmp join-group 225.0.0.45 dialer idle-timeout 30 dialer-group 1 dialer map ip…
user1389735
  • 166
3
votes
4 answers

Any tips for Cisco IOS newbie from Linux world?

I'm from Linux world. In Linux I've been doing firewalls, QoS, dynamic routing, tunnels, ipsec, ipv6 and even written custom networking extensions to kernel. And now I got some Cisco 681 under my control. I understand the basics but I'm constantly…
dpc.pw
  • 173
3
votes
4 answers

How to Enable Ports 25 - 28 on a Cisco Catalyst 3750

I am trying to enable ports 25 - 28 on my 28 port Catalyst 3750. These four ports are my fiber ports. I am using the following command to bring up that interface. interface range Gi1/0/25 - 28 That works and it dumps me in the config-if-interface…
Jared Brown
  • 247
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  • 15
2
votes
1 answer

cisco switch: port-security mac address sticky with an access point?

how can I secure a switchport where an access point is connected? Of course I can't use switchport port-security mac-address sticky otherwise my WLAN clients would not be able to connect. Or am I wrong an there is a way how to allow only a…
fips123
  • 361
2
votes
2 answers

How do you save the configuration of a Cisco switch?

I have a Cisco 2960s switch with 24-port 10/100/1000 Ethernet Switch with PoE, and I have set it up correctly (I think). I can't work out how to save the setting I have made because every time I unplug the device it resets to the factory settings.
user201377
2
votes
1 answer

How do you know the exit status of commands in cisco switch?

In Unix, if we do echo $?, it shows the status of the last command executed. Where $? holds the value 0 or 1: 0 implies success 1 implies failure But how can we know the status of a command executed in a Cisco switch?
munish
  • 151
2
votes
4 answers

Cisco 7206 error trying to copy running-config (Bad file number)

I have a cisco 7206 that terminates a bunch of pppoa sessions for dsl users. Today I noticed that if I tried to "show run" nothing happened. I mean that it doesn't show anything and just sends me right back to the command prompt. I decided I should…
jasondewitt
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