IOS, or Internetwork Operating System, is the operating system employed by most Cisco devices. It is also used to refer to the command line shell that is used to configure Cisco devices.
5
votes
2answers
77 views
Metro Ethernet settings on Customer devices
I am about to connect three remote sites to the main office by means of an metro ethernet provided by a service provider. The sites are connected by means of l3 and running OSPF on the connecting ...
11
votes
4answers
186 views
BGP signalled MPLS issues
I am having an issue getting a VPLS up using an ME3600x with 15.3(2) and BGP signalling.
@yelfathi and @packettalk have pointed me down the correct route but not sure how to resolve it.
I have 2 ...
5
votes
1answer
38 views
Configure External Interface for DHCPv6 client on Cisco IOS
What are the necessary steps to configure IOS 12.4(25f) to support IPv6? Comcast is the ISP, and I'll be using a Server 2012 box for internal DHCPv6.
I'll need to grab a DHCPv6 address from Comcast ...
7
votes
1answer
99 views
Cisco IOS built-in SSH client default version
You issue the command ssh 192.168.97.97 from a IOS device and the destination IOS router/switch SSH server is accepting both SSH versions. Being that you did not specify a version to use on the SSH ...
4
votes
3answers
136 views
AAA/TACACS+ password on Cisco switch always fails at second password prompt
Whenever logging into a network device using AAA/TACACS+, if I fat-finger the password prompt after the username prompt, the second password prompt always fails even when the password is correct. I ...
13
votes
3answers
309 views
What factors drive a Cisco IOS upgrade?
In order of preference/priority, what factors do you consider in driving an upgrade (or downgrade) with Cisco IOS? If no compelling factors exist, how long would you allow a particular version of IOS ...
-5
votes
2answers
78 views
auto-summary / no autosummary output [closed]
My class book (its in russian unfortunately) says that auto-summary command should output some info upon execution, but the only place where i could run it was rip config mode (otherwise it just ...
6
votes
3answers
159 views
Why does “show adjacency” take so long to run?
Why does the "show adjacency" command take so long to run (in the order of minutes) on Cisco IOS Software, 7200 Software (C7200P-SPSERVICESK9-M), Version 12.4(4)XD5, RELEASE SOFTWARE (fc1)? The ...
7
votes
5answers
234 views
How can I speed up CLI typing in Cisco IOS using shortcuts?
I know we can use auto-completion (tab key) and abbreviated commands (such as sh ip int bri) to speed up typing.
However, I'm still not satisfied with typing crypting chains such as sh ip dh sn bi | ...
5
votes
1answer
82 views
What is the NO PAYLOAD ENCRYPTION version of the IOS software?
When looking at the downloads available on the Cisco site, they have a regular version of the file and a NO PAYLOAD ENCRYPTION version. What is the difference? And why would one choose one over the ...
-5
votes
3answers
99 views
Need some standard configurations for Cisco 1900 series router [closed]
Just bought a Cisco 1921 router but I'm new to Cisco. Been having a hard time configuring it, what are some standard configurations for these? I have a L3 switch that will be connected to it and using ...
21
votes
19answers
3k views
How can I see which switchports are not in use?
On a large Cisco Catalyst switch stack, almost all switchports are patched. I need to identify the ports, which are not in use, for connecting further devices.
Following switchports, cabling, patch ...
10
votes
3answers
500 views
How can I capture traffic on Cisco IOS switches?
For investigating a problem in client to server communication, I need to capture packets for analysis. However it's not allowed to install a packet analyzer, such as Wireshark or tcpdump, on client or ...
4
votes
2answers
101 views
What is Dec MOP and how to disable it?
Performing a packet capture I keep seeing strange "DEC MOP Remote Console" frames:
No. Time Source Destination Protocol Info
141 83.557841 Cisco_57:62:a0 ...
