The operating system used on the majority of Cisco's routers and switches; a package of routing, switching, internetworking and telecommunications functions tightly integrated with a multitasking operating system. For Apple's mobile device OS, use apple-ios.
9
votes
3answers
2k views
Why is my router CPU at 40% when no processes use more than 2%?
I have a problem, I have a Cisco 1841 running Cisco IOS 15, and I get strange behavior. The CPU usage is shown as 40%, but there is no processes that is using this much CPU power.
Here is an ...
9
votes
1answer
326 views
Simple Multicast Design
In order to support desktop imaging requirements I need to correct the multicast design on an existing network, but am not well versed in this subject. The diagram below gives a basic example of the ...
7
votes
3answers
3k views
How to obtain Cisco IOS firmware?
Quick and simple question, but I've not been able to find an answer around.
I have a Cisco ADSL router (model 877).
I don't have any Cisco support contract.
How can I obtain an updated firmware for ...
6
votes
1answer
3k views
Why would Windows Server not respond to DHCP DISCOVER?
My network was working just fine and I broke it.
There is a Cisco 1711 router which was configured to hand out DHCP leases to the client PCs. I have a domain controller (Server 2008) on the same ...
6
votes
2answers
88 views
Prevent end-users from purchasing apps on iOS
We are looking to deploy iPads from inside our organization. We want to be able to install apps for users, which can be done via Mobile Device Management. However, we do not want users to be able to ...
5
votes
4answers
899 views
Cisco IOS QoS prioritize SSH but not SCP
How can I prioritize ssh traffic to ensure low-latency but throttle SCP file transfers? I'm looking for a solution that is not host specific so I don't have to add lists of IP addresses. Thanks!
5
votes
2answers
627 views
Cisco IOS: Segregating VLANS
I am trying to segregate the traffic on the VLANs, as one is our visitor VLAN (VLAN 3 is the guest lan). It is a Cisco 881W router.
Here is my VLAN configuration:
interface Vlan2
ip address ...
5
votes
1answer
485 views
Setting spanning tree link “priorities” in Cisco switches
I've got a pair of C2960G-48 switches (running IOS 12.2(46)SE, if it makes a difference) with redundant trunks in place. On these switches there are a bunch of VLANs that carry quite heavy traffic at ...
4
votes
6answers
982 views
Cisco vs Everything else
A huge debate raged when we were setting up a new phone system. The guys doing the install did not believe in paying high prices for Cisco gear when they could do the same things with lower priced ...
4
votes
1answer
297 views
Why did my Cisco router hang?
We have a Cisco 1841 in our storage IDF that was originally running a 12.4(1) IP-BASE image; I wanted to upgrade to an advancedservicesk9-mz image, but the flash did not have enough space, so I ...
4
votes
1answer
251 views
Can somebody please explain IOS line authentication?
I'm trying to understand a config on one of our Cisco routers (teaching myself iOS) and have run into a problem with one line.
Can somebody please explain the "line enable" piece of the command below ...
4
votes
1answer
168 views
cisco 870 assign IP
I'll try to be "short." I've successfully enabled http server option on my Cisco 870, now I need to reach it and use the web based configuration. I haven't found how to assign an IP to the router ...
4
votes
1answer
75 views
Cisco IOS XR version clarification
I've run across this cisco advisory
It says:
This bug was introduced in Cisco IOS
XR Software release 3.6.2 and is fixed
with SMU hfr-k9sec-3.6.2.CSCtd74795.
The SMU ID for this fix in ...
4
votes
3answers
2k views
How to advertise routes to IPSec tunnels in OSPF using Cisco IOS
I have Cisco 1800 series router (running C181X-ADVIPSERVICESK9-M) with lots of IPSec tunnels. I want to add this router to OSPF and configure it to advertise routes to remote subnets accessible via ...
3
votes
3answers
1k views
cisco catalyst 2960S, which version of software to upgrade to?
This feels like a dumb question, but here goes.
I have a Cisco Catalyst 2960S switch that is currently running software version 12.2(55)SE3
The most current software listed on Cisco's website is ...
3
votes
2answers
3k views
Can IOS be upgraded on a Cisco Catalyst 6509 switch without downtime?
There's this Cisco Catalyst 6509 switch with 2 (two) supervisor modules; one of them is active, the other is (almost always) in standby.
We need to upgrade IOS; current version is 12.2.something (I ...
3
votes
1answer
120 views
Dual Cisco Router Stateful Firewall
At my company we have a single Cisco 3925sec/k9 router running BGP with 2 ISPs.
Now we want to purchase a redundant router of the same model to eliminate a single point of failure.
I can set up BGP ...
3
votes
2answers
243 views
Delay NTP Initialisation, Cisco 877W, IOS 12.4(24)T1
I have a Cisco 877W which I'm using for my home ADSL connection (and as a refresher in Cisco IOS). I've got a working config in-place with my PPPoA connection coming online correctly, and VLANs and ...
3
votes
1answer
1k views
Output Drops on Cisco Switch — Counter?
I was always under the impression that the Total output drops was a counter that goes up until it resets (or maybe wraps around 4 billion).
However, this seems to indicate otherwise, or something is ...
3
votes
2answers
4k views
QoS for Cisco Router to Prioritize Voice and Interactive Traffic
I have a Cisco 891W NATing Voice and Data to the internet over a 10mbit/2mbit connection. Voice traffic gets degraded when I upload large files. Pings time out as well.
I tried to configure a QoS ...
3
votes
5answers
4k views
Is there a command in Cisco IOS to show all routes tagged with a specific tag?
In Cisco IOS, if I have a route-map entry as follows:
route-map redistribute deny 10
match tag 65000 100
!
Is there a 'show' command that will give me a list of all routes that will match that ...
3
votes
0answers
54 views
IOS QOS service policy pass-through on a tunnel interface
I have some SIP phones on one network that go through an IPIP tunnel to get to the server.
I've setup QOS rules to watch for appropriate VOIP traffic as follows:
class-map match-any class-voice
...
3
votes
2answers
446 views
Cannot ping outside Fa4 on cisco 871w Router (SoHo)
After starting fresh after a write erase and a reload on a cisco 871w. I cannot ping outside of the wan (fa4).
I gave vlan1 (default) an ip because apparently the built in "4 port switch" is a layer ...
2
votes
2answers
476 views
Factory Reset my Cisco 1841 Router, Serial cable required?
Is it possible to connect to my Factory Reset Cisco 1841 router without the blue com cable? For instance is there a default IP address I can connect through one of the ethernet interfaces? I just did ...
2
votes
4answers
993 views
Cisco 1800 series router simulation program
I need to know how to program these routers for school, but I need to exercise at home. Are there simulators for the console interface, for learning purposes? I took a look at eBay to get one, but ...
2
votes
2answers
1k views
Cisco Terminology: flash and nvram
I'm a student that will be taking my CCNA exam in early June and I'm doing a lot of practical revision, I tend to get sidetracked by little things such as this question I'm about to post. It's ...
2
votes
5answers
2k views
Is there a way to submit a batch of commands to a Cisco router and have them execute from the router?
I need to change the configuration of a remote (6 hours' drive) client's Cisco 871 (IOS 12.4.15T) from my location because of some new internet service at his location. To be more precise, I need to ...
2
votes
2answers
840 views
cisco router loses configuration on reload even after saving it
I'm configuring a Cisco 3640 and it's not saving simple things like my hostname.
I've tried with 'wr' and 'copy running-config startup-config'. Also erased the configuration but no luck.
There's no ...
2
votes
2answers
267 views
Cisco IOS router config — how to disable SSH / SNMP on all but loopback address?
Sorry for the naive question; a quick reading of the cisco docs doesn't answer this question...
So I've got a router (say for the sake of argument a 4500 running IOS 15.x)
It has interfaces in 3 ...
2
votes
2answers
2k views
Why do I start at privilege level 1 when logging into a Cisco ASA 5510?
I have created a test user that is set to privilege 15 in the config:
username test password **************** encrypted privilege 15
When I log in to the ASA 5510 I am in privilege 1 according to ...
2
votes
2answers
2k views
Restoring a Cisco router config using a config file
I'm working with a Cisco router over telnet (actually PuTTY), and I'm a newbie to ios.
I'm slowly getting the hang of it, but have a very basic question:
I have issued a show running-config command ...
2
votes
1answer
4k views
How to disable ICMP redirect packets in Cisco IOS?
I'm studying a "good practices" document for Cisco IOS, and one of its controls tells me to disable ICMP Redirect packets in the router. Sounds reasonable. So I go test it in Cisco Packet Tracker (a ...
2
votes
1answer
780 views
Monitoring incoming/outgoing packets on a Cisco switch
I would like to monitor (i.e. have the switch print out packets) incoming and/or outgoing packets on a Cisco switchport.
For instance, I'd like to be able to tell it: Print to the log all packets ...
2
votes
2answers
250 views
How to determine most stable Cisco IOS release?
This post is about a Catalyst 4948E switch. I was looking on the download page and realized that there are no "GD" versions available. Are the "ED" versions stable? Even if you change "ED" to "GD" ...
2
votes
1answer
267 views
Cisco Catalyst 4500 Policy Based Routing
In order to test a new firewall I just set up I'm trying to implement policy based routing on our core switch. I want traffic from certain vlans to be routed to the new firewall while everything else ...
2
votes
4answers
1k views
Un-failing over a Cisco PIX 515e
We had a power outage at our data center last week and when our dual PIX 515E running IOS 7.0(8) (configured with a failover cable) came back, they were in a failed over state where the Secondary unit ...
2
votes
2answers
941 views
Using EIGRP to Advertise a VPN Tunnel Route
I have several routers all connected via a MPLS netowrk and one that is not. The one that is not part of the MPLS network is connected to one that is via a VPN tunnel. All the routers on the MPLS ...
2
votes
1answer
485 views
Allow my OpenVPN server to work behind a Cisco 800 Router
I have an OpenVPN Ubuntu Server working on ip 192.168.1.11
I need to let my roadwarriors use it from anywhere.
I have a Cisco 800 router but I'm not an expert...
I've downloaded using tftp its ...
2
votes
1answer
895 views
Cisco 2610XM: Advanced Enterprise vs Advanced IP Services?
What are the differences from the Adv. Enterprise firmware and the Adv. IP Services?
From the 2610XM perspective.
Regards,
2
votes
2answers
175 views
DMZ-to-outside Access Lists
I'm learning about firewalls and access-lists, and I'm trying to decide what sort of access list I should have on the DMZ, particularly regarding outbound traffic. There's certain outbound traffic ...
2
votes
2answers
4k views
Example mrtg config to monitor Cisco CPU/memory usage
I have an existing basic MRTG setup done using cfgmaker to monitor the traffic of our Cisco router.
I'd like to add configuration sections to mrtg to have it monitor the CPU usage (min/avg/max if ...
2
votes
2answers
2k views
Simple road warrior IPv4 VPN configuration in Cisco IOS
I'm looking to setup a reasonably simple road warrior VPN configuration on our Cisco routers. Frustratingly, I've been searching for this but cannot find a simple complete guide.
Multiple (not ...
2
votes
3answers
2k views
Help me with my Cisco ios config
I'm setting up a cisco 881 (this is my first ios device)
I got everything working the way i want except port forwarding
im trying forward all incoming port 80 traffic to 10.10.10.60 and I don't see ...
2
votes
3answers
426 views
*nix shell with IOS style completion?
Is there a Linux shell that will let you type less than full commands as you can with Cisco IOS, at least for the first command (and not its arguments)?
I haven't really thought enough if this is ...
2
votes
2answers
1k views
Route-Map vs ACL for Cisco NAT
Is there pros and cons of using route-maps vs access-lists for network address translation on a cisco router?
2
votes
1answer
170 views
Can a Private VLAN trunk also trunk normal VLANS
Imagine a topology with Switch A and Switch B trunked together. Also imagine a router on a stick attached to Switch A that routes for these VLANs. The VLANs are as follows:
VLAN 1 = 10.1.1.0/24
...
2
votes
2answers
1k views
Cisco router and switch configuration
I want to configure a Cisco 2600 series router to be DHCP server. To the ethernet port i want to connect a Cisco Catalyst 2900XL 24 ports switch, in this switch i want to connect a computer in port ...
2
votes
2answers
361 views
Configuring a loopback interface on a Cisco router
I have Router 1 with the following interfaces:
FA0/1: 192.168.9.193 255.255.255.224
S0/0/0: 192.168.9.129 255.255.255.224
S0/0/1: 192.168.9.161 255.255.255.224
This is for my assignment at ...
2
votes
0answers
203 views
Is it possible to embed TCL directly into a Cisco startup-config?
Is it possible to embed TCL directly into a Cisco startup-config? From the (lack of) information I'm finding, it doesn't look do-able.
I have a tool that generates Cisco configurations based on some ...
2
votes
1answer
716 views
Cisco 3925/k9 sub-interface vlan support
I've got a brand new cisco router 3925/k9. I wanted to set up a router on a stick on my network, but it turns out it doesn't support vlan sub-interfaces. I did it multiple times in gns3 simulator on ...
