Questions tagged [cisco-ios]

For discussion about Cisco's Internetwork Operating System - Cisco IOS

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Cisco IOS pick default route from two DHCP interfaces with track

I plan to have a portable IOS cisco router which will have two DHCP assigned ISP addresses from unknown ranges. A tunnel is then built through the preferred ISP to another outer. I would like to set ...
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2answers
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sh int transceiver Explanations

When looking at the output of show interfaces transceiver on a Cat 4500X you notice that there is a Tx and a Rx power measurement. My questions about this output are: Why is each transceiver ...
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1answer
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Is test etherchannel load-balance disruptive?

Is this command disruptive or just a logical exercise of existing configuration? test etherchannel load-balance int po3 <some mac here> Platform is 6500 series, running IOS. Thank you!
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2answers
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TACACS Implentation server key error

I'm implementing a new TACACS server on our network after having removed the old TACACS server which we no longer own. I've already gotten the implementation working with the NX-OS devices, but when ...
3
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1answer
4k views

Cisco 3560 snmpget OID temperature not found?

I'm working on creating a monitor script for some access layer switches. I've gotten it to work with some Cisco 3750s, but when I try it on a Cisco 3560, it says the OID object not found. After ...
3
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1answer
4k views

How to setup Cisco IOS with multi public IP's

I'd like to set up a little network environment. We have bought 2 different subnet from our ISP. The WAN internet connection : xx.yy.81.61/26 WAN gateway: xx.yy.81.1 First subnet : xx.yy.81.80/30 (...
3
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1answer
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EZVPN accessing public internet through tunnel not working - hair pinning!

I have a task where I need to be able to use EZVPN with split tunnel but still have access to an external server from the corporate network as the external server will only accept connections from the ...
3
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1answer
1k views

All switching on cisco 3750 done by cpu

A little confused.. When trouble shooting excessive output drops on a 3750 i noticed that al switching is done by cpu instead of "route cache". This 3750 has no ip routing enabled and no ip cef (ip ...
3
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2answers
382 views

How can I use an HTTP CRL on Cisco IOS?

On a Cisco 867 running IOS 15.6(3)M7, I'm trying to do the following: TEST-GW1(config)#crypto pki trustpoint vpn-p2s-server-11 TEST-GW1(ca-trustpoint)#crl query http://myvpn/crls/21.crl % URL must ...
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1answer
63 views

what is the point of making directories in a cisco cli

what is the point of making directories in a Cisco router. I noticed its was kinda like Linux mkdir and all that stuff, but what is the purpose?
3
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1answer
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How do I enable tcl console on csr1000v?

I have csr1000v running in virtualbox and I managed to connect to it and the console looks like "RP/0/0/CPU0:ios(admin)#". However, when I try to launch tclsh - it says "invalid input detected". How ...
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1answer
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How to erase running-configuration in Cisco IOS-XE?

I am using ASR 9k series Routers, which runs IOS-XE advancedmetroipaccess License I tried erasing NVRAM: and then tried to run copy start run But it gives me error : hostname#erase /all nvram: ...
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1answer
220 views

Cisco Route Tagging Question

We have created a network as shown in the topology: The goal is for subnets/networks in LAN_SW to tagged and the tagged networks to be recognized by routers, CPE, PE CORE_P, REMOTE_PE, REMOTE_CPE and ...
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2answers
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Show all routes from one next-hop via CLI

I'm running into what should be a very easy problem to solve- I need to see all routes coming from one specific next-hop on a few cisco ASR 1002-X's that I have in my network. Normally this should be ...
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0answers
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Dual ISP NAT Failover Not Working

I have a Cisco 1841 router with an HWIC-4ESW switchport module attached to it. Fa0/0 is connected to ISP1 and Fa0/1 to ISP2 and both are "ip nat outside", the switchports are in interface Vlan 1, ...
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3answers
1k views

Can I limit Cisco IOS login to specific users?

I have a Cisco IOS router that is used for WAN access. I have 2 additional users defined with less privilege to check status and to use ssh. I wonder if it is possible to restrict certain user to only ...
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2answers
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Why does the CISCO's command 'enable secret <password>' produce different hash from MD5?

I am configuring a CISCO's 4331 router password, in Packet Tracer. More specifically I use the command enable secret weakpassword. This command uses by default MD5 to hash the last string (i.e ...
2
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3answers
130 views

Cisco Switch without VLAN support?

I've been reading about VLAN and wondering is there any Cisco Switches that do not support VLAN? So far, all switches that I found do support VLAN. This is one of the example in my lab. Cisco-Switch-...
2
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2answers
1k views

What is the difference between these IOS firmware versions?

I obtained some IOS images to play around with using GSN3. Some of them are as follows: c2600-i-mz.123-26.bin c2600-ipbase-mz.123-26.bin I understand that there are different firmware versions for ...
2
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3answers
104 views

where does the running-config come from in a new fresh switch?

Generally, in a fresh switch, I see a startup-configuration. Switch#show startup-config startup-config is not present But when I do 'sh run' I see a default running config in it. Where does this ...
2
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4answers
861 views

Configuring Ports on a Cisco Switch

I am very new to Cisco networking (haven't done any course either). I have been trying to learn a bit of networking myself and had no trouble in doing some of the basic stuff which i needed for my ...
2
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3answers
11k views

Reason of “aaa authorization exec default group tacacs+” command in Cisco IOS?

I have a following very minimalistic AAA configuration in ISR router with IOS 12.4(22)T: aaa new-model aaa authentication login default group tacacs+ enable aaa authentication enable default group ...
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2answers
1k views

How to upgrade the IOS on Cisco 2610 with 12.3

I have Cisco 2610 and it has version 12.0. I want to upgrade to 12.3 The DRAM is 32MB and Flash is 2 slots of 8MB and 8MB. Which IOS to get that fits in 8MB with 12.3?
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3answers
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Virtual Appliance - Cisco Router

My colleague said that it is possible to virtualize a Cisco router i.e. run the Cisco IOS inside ESXi and it would act like a real cisco router so thus can be used in a light production environment. ...
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2answers
2k views

PC can't ping router 2 hops away (home lab)

To give some context, here is my setup: ----(10.0.0.1 - S0/0/0) R1 (S0/1/0 - 10.0.1.1)---- | | | | ...
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2answers
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Can I connect to Cisco router's AUX port from a switch Ethernet port?

I know from this question console connection via Cisco router's AUX port that it's possible to connect from a Cisco router to the switch/router's console port but I would like to know if it's ...
2
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2answers
262 views

Failover with two ISPs, one with public and one with private addresses

I have the following setup: a small office network behind a Cisco 2900 series router. The network consists of about 20 devices - PCs, printers and switches. I have two ISPs that I want to configure ...
2
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2answers
6k views

Download startup config from Cisco device using SCP

I can successfully programmatically download the config from Juniper network devices using SCP - I'd like to do the same for a Cisco router. SSH access is already working, and I've enabled SCP using ...
2
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1answer
332 views

Cisco 3548XL VLANs, no router

I am working on a project currently in our lab. I have 1 3548XL with an uplink to our telco. Most of my Cisco experience is on the 6500 platform so I am used to having L3 features at my disposal. Is ...
2
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1answer
37 views

Cisco router with 3 spaces between `deny` and `icmp`

I was configuring deny icmp any any traffic when I realized it was not in the config. I verified it with do sh run | i deny icmp command as follows: R1#configure terminal Enter configuration commands,...
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2answers
105 views

Suppress CLI terminal output on IOS

I would like to know if we can suppress certain lines from being displayed on the CLI. Example: I call following TCL script, that in itself calls some other scripts. What i Get on the screen is this: ...
2
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2answers
512 views

Cisco ip helper-address how exactly translation works?

Can anyone explain how exactly works translation from broadcast to unicast? What is changed or modified in IP packet? Already I have read how it works and configured it properly for my network but ...
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2answers
98 views

No internet through router

I have the following network setup, but on the computer I can't access anything that's outside of the TP-Link router. When I tried to ping 8.8.8.8, I got reply from 192.168.2.1:Destination Host ...
2
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2answers
966 views

Why there is no advertised route to a neighbor on Cisco ISR?

With the following config I try to advertise a network to neighbor but the show command only list 0 prefixes to this neighbor. router bgp 2 bgp log-neighbor-changes neighbor 128.16.16.34 remote-as ...
2
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2answers
189 views

How to ensure startup-config is not changed, building CCIE rack

Let me start with short background for better understanding. We have LAB at work (Cisco devices mostly), and we would like to allow other employers connect remotely from their homes, build own labs ...
2
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3answers
2k views

What is a common setting for NetFlow Active Flow Timeout?

What is a common/best practice value for 'active flow time-out' for flow generation from packets. With 'active flow time-out' I refer to the time limit when the current flow (src ip,dest ip, src ...
2
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1answer
4k views

PBKDF2 vs SCRYPT

I am configuring a new 3560 switch. Running IOS Version 15.0(2)SE6. When I want to configure enable secret I can choose the following : #enable secret ? 0 Specifies an UNENCRYPTED password ...
2
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2answers
263 views

How to ping from PC on EIGRP area to PC on OSPF area without middle router?

This is my topology. And I can send a package to every router and PC within the colored area, how can I ping from a PC on EIGRP area to a PC on the OSPF area? I heard about default route but I saw it ...
2
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1answer
713 views

How to save the initial startup configuration in IOS XR?

I'm willing to try all the Segment Routing implementations one-by-one in XRv 9000 Router. Each time I have a specific implementation for SR e.g., SR-TE, SR-MPLS, SR-OSPF, and SR-ISIS ... etc. The ...
2
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1answer
431 views

4507r Supervisor engines aren't operating redundantly

The tl;dr : I have two supervisor engines in a 4507r but the standby unit doesn't appear to be ready to perform when the active module dies. On Sunday I had a network problem that appeared to be ISP ...
2
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1answer
352 views

DHCP Relay Problem

I'm trying to get DHCP to work between these two Devices. Any tip's would be wonderful! Switch Config Switch#show run Building configuration... Current configuration : 1596 bytes ! ! Last ...
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3answers
997 views

Translate between multicast addresses

I have an application with a bug that does not recognize a certain multicast address as valid. It's an address used by another system i don't have control over, and these two systems communicate via ...
2
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2answers
482 views

Manually set combo interface for RJ45 Cisco 3560-CG Series

I have a Cisco Catalyst 3560-CG that has two combo ports with SFP and RJ45 each. Is it possible to manually set the combo port to use the RJ45 only? If so, how is it done? I am troubleshooting a ...
2
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2answers
337 views

Cisco C800 - keep bridge interface up even when no active connections

Due to our clunky monitoring, we are watching an IP on a bridge interface on a Cisco C800, which sometimes won't have any active FastEthernet connections which means the bridge goes into the down ...
2
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1answer
57 views

Is there any way to break a router's password?

I want to change the configuration of a router but a password has been set. Is there any way to troubleshoot, coz no one knows the exact password.
2
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3answers
18k views

List interface names and MAC addresses on Cisco device?

I have what I thought would be a quick question, but it seems harder to do than I originally thought. Let's say I'm connected to a Cisco device (switch or a router). How would I list interface names ...
2
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3answers
14k views

Changing Label for Generic PC in Packet Tracer

I can change easily Router and Switch names in Packet Tracer using hostname command in global config mode. But how could I change a label of a Generic PC, let's say from PC0 to Sales? i could not find ...
2
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1answer
4k views

What are .pkg files in flash drive?

I have a Cisco 3650 switch and want to backup my IOS via tftp. System image file is flash:packages.conf #sh flash cat3k_caa-base.SPA.03.03.05SE.pkg cat3k_caa-drivers.SPA.03.03.05SE.pkg ...
2
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1answer
648 views

Show Inventory command on Cisco

Could someone please confirm if 'show inventory' command works on 'IOS (tm) C3560 Software (C3560-I9-M), Version 12.1(19)EA1d'? If no, what is version and upwards do I need this to get it working?
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1answer
3k views

Cisco - #show inventory vs #show interface

I am documenting equipment which requires me to state installed Physical Layer Interface Module (PLIM)/slot and transceivers/interfaces. What confused me is the different information shown between #...

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