Questions tagged [cisco-ios]

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

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NetFlow v9 on Cisco Catalyst 3560 not working

my team and I just don't seem to get NetFlow on a Catalyst 3560 switch to work. let me show you the config: flow exporter NETFLOW-EXPORTER destination 10.10.10.12 source Vlan100 transport udp ...
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192 views

Connect Cisco 3560x with LinkSys SRW2008 via Fiber

We have several buildings on campus. In our main building we have a core switch which is a Cisco 3560X (with a C3KX-NM-1G module installed) and a Cisco SR2024, among other switches. In another ...
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485 views

List current object-group local_lan_subnets on Cisco IOS 15.5

I'm configuring an Cisco 867VAE and I'm stumped how to list the current (and I assume) dynamic entries in the object group "local_lan_subnets". The factory settings for the router come with an ACL ...
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1k views

Cisco 2960X & IPDT

I am interested in finding the IP addresses assigned to devices attached to each interface on a Cisco 2960X switch. It seems like IPDT is exactly what I'm looking for. However it seems like the ...
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0answers
249 views

Able to test AAA to Radius Server from router but unable to log into Router with A.D

I am having issue with setting up my Radius server to authenticate before going to the router. I am able to do a test from the router successfully but once I exit the router and log in with my Windows ...
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3k views

How to limit the internet bandwidth to specific department in my company, using a Cisco Router?

I have this case: In my Company we have 2 Internet Access in production R1-A router and R2-B router they are both in separate networks, R2-B have the highest priority which it use to Call Center. ...
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1answer
48 views

Routing failed after define static route on core switch

Current connection path: 10.40.20.0/24 desktop <-> access switch <-> core switch <-> 10.30.15.33 NAT firewall for internet access Objective: adding additional path as following to ...
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3answers
122 views

Switch syntax, vlanXX and vlan [space] XX

How does a switch OS know that this is the same syntax? There are certain commands where you might reference the vlan like so "switchport access vlan 35", (a space between vlan and the number) and ...
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39 views

IOS. Whats the difference between these 2 commands

I am completing an online course for the network+ and am going through one of the labs. Here is a diagram of the network in question. Specifically I have a switch with 24 fast ethernet ports and ...
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129 views

What does the Cisco HTTP client (help to) do on a switch?

While checking for vulnerabilities in one of our Cisco switches I came upon this: CVE-2019-12665. Excerpt from the CVE: A vulnerability in the HTTP client feature of Cisco IOS and IOS XE Software ...
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2k views

Cisco ios - loading 15.2 into Catalyst 2960

Is it possible to load cisco ios 15.x into an old 2960 or 3560? I tried to do that (study purpose) and it's throwing an error. The error I see apparently has to do while decompressing the image or at ...
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800 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 ...
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108 views

Cisco Catalyst pseudo interface?

I think I remember reading somewhere that you could have multiple VLANs assigned to a single interface by way of a pseudo interface. Googling with that vocabulary doesn't return proper results though, ...
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38 views

BGP routing multi-homes router

right now this is our current BGP config. we have two class C's and two ISP's. we would like both networks to prefer the Verizon path 157.130.124.197 for inbound over ATT while we do maintenance on ...
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51 views

Why we define pool for declaring CISCO router DHCP?

In case declaring DHCP server in CISCO routers, should define pool with network addresses.↓ Example Router(config)#ip dhcp pool net1 Router(dhcp-config)#network 192.168.1.0 255.255.255.0 The router ...
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28 views

What is the purpose of Cisco's `ip domain round-robin` feature?

While configuring one of Cisco's routers and reading documentation I've found an interesting feature: ip domain round-robin. Documentation says, that this options makes dns server rotate entries ...
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31 views

Show ports in use on Catalyst 3570

I picked up a used C3570 and am new to IOS. I am trying to ask the switch to show which ports are in use. My searches lead to the command "show modules" but that's refused by the switch (...
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45 views

DHCP when you have both layer 3 and switch ports

I have the following config: ip dhcp pool Vlan10 network 192.168.1.0 255.255.255.0 default-router 192.168.1.1 interface GigabitEthernet0/0 ! interface GigabitEthernet0/0.10 encapsulation ...
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37 views

Cisco create BGP connection, do we need two direction's neighbor command?

I have two routers like bellow: in the Router1, I configured like bellow: ! router bgp 100 bgp log-neighbor-changes no synchronization neighbor 12.0.0.2 remote-as 200 network 1.0.0.0 mask 255....
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902 views

Stateful DHCPv6 Default Router

I understand that stateful DHCPv6 cannot provide hosts with a default router, as DHCPv4 could. Hosts would need to determine the default router based off of the information in RA packets. In my lab, ...
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93 views

Exporting cisco ASA configuration into HP aruba?

I wanted to export the configurations from cisco asa firewall into HP aruba ,is there anyway we can make it happen. My company just installed the HP and replaced it with cisco arube, and we have a lot ...
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1answer
388 views

Console output garbled - Cisco 1812 Router

Console output became garbled/scrambled during the reset procedure using ROMon, making it unviewable, and has been ever since on this device. See screenshot. Have tried various suggested baud rates ...
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1answer
1k views

Spoof MAC address of VLAN interface on IOS

Is there a way to change the MAC address of VLAN interfaces (switched virtual interfaces) on IOS? I would like to configure the MAC address of a Catalyst switch. Because all VLAN interfaces derive ...
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1answer
304 views

Cisco MIB Locator

Cisco has a MIB Locator which gives you a list of supported MIBs for a specific Cisco IOS Release. I have a MIB and need information on wich IOS version this MIB is supported. Does Cisco provide a ...
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2k views

Change Cisco VPN User Password Question

I have telnetted into a Cisco 2851 Router with 7 set users with passwords for a PPTP VPN that show in the following format when I "show running-config": username user1 privilege 0 password 7 ...
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1answer
327 views

IOS tools to discover a network

I would like to learn/discover a new topology. I usually use these commands. Do you know any other good tools for this? (the network have routers, switches, firewalls, multiple vrfs, vlans and all ...
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406 views

OSPF Aggregation and advertisement

In My Cisco Router i configured the following OSPF interfaces: interface eth1/0 description link to net0 10.19.0.0/24 area 0 ip address 10.19.0.1 255.255.255.0 ip ospf ...
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2answers
33 views

Add allowed vlan to vlan.dat automatically

I have a switch configuration for a Cisco 2960cx that allows a specific VLAN on a trunk but no interface on the switch explicitly accesses that VLAN. So when the configuration is ran for the first ...
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68 views

Firmware of Cisco Phone

i want to configure IP phone Cisco DX650 with Sip.Anyone have idea about it how i can upload firmware of sip feature
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48 views

WebAuth With RADIUS For Switch Web Portal

I have a Cisco IE4000 running IOS 15.2. I am trying to login with my RADIUS credentials to the web portal for the switch. Currently the RADIUS is configured for successful login to Console and SSL but ...
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2answers
1k views

Why does yealink ip phone is not getting ip address from voice vlan?

I have configured separate vlan for voip and connected interface to it (as shown below). But the phone is not getting ip address automatically. switch- cisco 2960-x phone- yealink I had tried: (on ...
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110 views

Multiple 802.1x clients, single port support on a Cisco 3750 switch?

I'm thinking of using our Cisco 3750 switch with our RADIUS server for 802.1x authentication on our Ethernet ports. If I enable 802.1x and a user connects a switch to their Ethernet jack, and the ...
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264 views

Path for accessing Cisco-IOS-XE-Tunnel yang module in postman

Recently I am working with RESTCONF on Postman. Today I was trying to send HTTP request via postman to IOS-XE-Tunnel using the below path: https://XXX:XXX/restconf/data/Cisco-IOS-XE-tunnel:tunnel ...
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1answer
53 views

License question on router cisco

Could anyone help me on license question on router cisco. Is ADV IP SERVICES LIC the license on router Cisco that all I need if I want to run these features on my router Cisco : L3VPN, L2VPN, VPLS and ...
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111 views

IOS Configure Terminal equiv in C3700 Software

I'm so used to using conf t to get into configuration mode, but it doesn't work in "Cisco IOS Software, C3700 Software (AP3G2-RCVK9W8-M), Version 15.3(3)JA3, RELEASE SOFTWARE (fc1)" What's the ...
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710 views

Cisco 867vae not routing properly

I have got a new Cisco 867vae and connected to ADSL 2+. The connection is working well, I just dont seem to have the routing right. From the router I can Ping 8.8.8.8 but from the computer I can only ...
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1answer
24 views

Cisco ip helper-address

I am looking at the DHCP documentation and i cannot seam to find how to configure the router to use a loopback interface as the relay-agent. My objective is to use option 82 so that the dhcp server is ...
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1answer
13 views

Multiple administrator connecting to a router - who has precedence? Can they monitor each other's logs?

Just getting started in Networking. Came across multiple administrators connecting over Telnet. Does someone who connected first have precedence over everyone else? Does a admin connected to VTY line ...
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1answer
12 views

IP SLA VS tracking IP-route reachability for HSRP

I have two Cisco switches A and B, which I want to use HSRP to track if route to specific IP still works, but according to my understand it could be either IP SLA or tracking IP-Route Reachability ...
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1answer
31 views

IPCP removing default route when 2 available

I've been stuck on this one in my lab for a while. Any help is appreciated. Here's my CPE edge topology: https://i.imgur.com/UZ4u0XG.png Take the below scenario: I have 2 circuits coming in that I am ...
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1answer
18 views

Traffic flow of tunnel interfaces

I would like to understand traffic flow in a router. In what direction do i need to apply a policy-map in order to affect traffic? Especially regading tunnel interfaces, as traffic both comes and goes ...
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1answer
58 views

Cisco DHCP relay with Microsoft DHCP server

Current situation: we have a C3850 switch serving DHCP lease to desktop clients without communicating with any upstream DHCP server Objective: We would like the C3850 switch continue to serve DHCP ...
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1answer
40 views

When do ACLs on SVIs get applied on Cisco Catalyst devices?

I don't understand exactly when an ACL will get applied when on an SVI. Given the following (pseudo) configuration int vlan 100 ip address 10.0.0.1 255.255.255.0 ip access-list in in ip access-...
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1answer
93 views

Cisco IOS Sanitization: Any Way to Not Use NVRAM?

We want a method to sanitize Cisco IOS 15 routers (ISR Gen 2) before they are removed from the facility. While a "write erase" works perfectly if the router is breathing, how to sanitize dead routers ...
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2answers
47 views

Why doesn't kernel itself had entire L2/L3 protocol stack? [closed]

I know kernel itself handles protocols in layer 2, layer3 and layer 4 at ipv4 stack, but why can't kernel itself doesn't have protocols such as STP/RSTP/xSTP/OSPF...etc, implemented. Why should we ...
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1answer
81 views

Cisco Zone Based Firewall

I have Cisco 891F configured with ZBF from CBAC. Right now, router is wide-open SSH/443 or anything my public address is listening on, which is not what I intended. My intention was to only allow IMCP ...
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1answer
56 views

Cisco IOS RA VPN with internal NAT

We have a Cisco 871 setup with a remote access VPN which works fine. However we now need the RA-VPN to be able to access an IP on the LAN which only speaks with an authorised subnet. IP addresses as ...
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1answer
270 views

How to set vlan QoS priority for voip (on cisco 2960)?

I have assigned all voip-related ports to one vlan. I want to set up the QoS priority for that vlan. Which commands can help and in which mode? I have assigned all required ports to one vlan. I tries ...
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3answers
351 views

Static Routing Or Connecting 2621XM routers [closed]

I have been trying to understand the mechanism of static routing. I connected two of 2621XM routers forming their networks on different subnets but unfortunately even though I am doing static routing ...
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1answer
21k views

Cisco ISR 4431 Router GigabitEthernet Flow-control Disable

I've got a new Cisco ISR 4431 Router running IOS XE 03.13.02.S and IOS 15.4(3)S2. WAN connection is a Metro Ethernet circuit delivered over copper and ISP has requested that we force the port to 1Gbps ...

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