Questions tagged [cisco-ios]

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

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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
91 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
58 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
301 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
359 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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1answer
156 views

Cisco IOS limit bandwidth to domain (wildcard) [closed]

I'm fairly new to Cisco IOS configuration. I have an 800-series router and, long story short, I'd like to limit the incoming and outgoing bandwidth allocated to some iCloud servers to prevent ...
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1answer
8 views

Steps for upgrading to Cisco DNA Center?

Has Anyone upgraded from cisco Prime to Cisco DNAC, if so then Does anyone have Steps (Prep Work) checklist suggestions before beginning the Brownfield Deployment of Cisco DNAC ?
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0answers
58 views

Dual WAN with each ISP in a VRF - Cisco IOS

I have a DMVPN spoke router setup almost identically to the spoke configuration listed here (Also quoted below): https://www.cisco.com/c/en/us/support/docs/security-vpn/dynamic-multi-point-vpn-dmvpn/...
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0answers
17 views

NAT syntax comparison

Could I know if the NAT syntax on ASA5510 v9.1.7 should be the same on ASA5512 v9.9 or v9.12.3 ? Hope to get your answer. Many thanks
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1answer
48 views

How to init connection with a Cisco over serial & minicom?

Trying to connect to a Cisco router, in purpose to learn Cisco skills that could help me finding a job. So, I plugged a cable in the rj45 Console (blue) port of a Cisco 888 router, and other end into ...
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20 views

Is it possible to specify a bandwidth parameter per service instance?

I have a physical interface with multiple service instances and policer per service instance: interface GigabitEthernet0/3  switchport trunk allowed vlan none  switchport mode trunk  mtu 9192  ...
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18 views

Rate limiting xFTP traffic originating from a Cisco IOS router

We have some routers on marginal cell links that we need to pull files from using TFTP or FTP. During file transfers connections to the router become so slow as to be unusable. Is there a way to rate-...
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0answers
192 views

Cisco erase nvram or erase startup-config doesn't work

According to this article, I can delete the current startup configuration files and return the router to its factory default settings with the erase nvram: and reload command. https://www.oreilly.com/...
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21 views

Cisco IE2000 - NTP Doesn't Associate

I'm having a very weird issue with a switch. It doesn't want to associate to my NTP servers. My config is very simple: ntp server ntp1.domain.com ntp server ntp2.domain.com ntp server ntp3.domain....
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18 views

What's the difference between “IP NAT Inside Source” and “IP NAT Inside Destination” commands in Cisco routers? [duplicate]

As much as i know both of this commands translate source address of packets that travel from inside to outside and destination address of packets that travel from outside to inside,so what's the ...
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0answers
29 views

Cisco PPTP server available routes protocol

I have a 2921 Cisco router in one place, and a Windows XP computer on another. I made my Cisco router as PPTP server, and my XP computer as a client. The router is located within a LAN with address ...
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0answers
52 views

Cisco C3750 and PRTG netfllow

I have a core switch (backbone) of our network that broadcasts all the vlans to other switches. I am trying to configure netflow on the switch and link it up to a Netflow sensor on PRTG. I followed ...
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0answers
61 views

Cisco Guestshell - Bridging of VirtualPortGroup0

i'm fiddling around with ne virtual-services functions of IOS-XE. Is there a possibility to bring interface "VirtualPortGroup0" into a bridge domain with some physical interface of the router? It's ...
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0answers
59 views

cisco zone-based policy firewall

How to limit the number of established connections for each host, that connect to the service? In the policy settings, I found only blocking by the number of half open connections. parameter-map type ...
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1answer
65 views

implementing broadcast traffic restriction

Can we restrict the high broadcast traffic from interface in Cisco ASR9k and 7600 routers? If so, what configuration we should apply?
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0answers
198 views

Prioritizing SSH, Telnet, TACACS in Cisco IOS

For Prioritizing SSH, Telnet, TACACS locally generated traffic on Cisco ASR running IOS XR, we have: ssh server dscp 48 tacacs-server ipv4 dscp 48 Need the same for cisco GSR: 12416/PRP running IOS. ...
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0answers
84 views

I'm unable to see packet drops after configuration of QoS policy

I aim to send iperf traffic from Endpoint1(Client) to Endpoint2 (Server) with the following SR path = {R1, R2, R3, R4, R3, R2, R1, R2, and R3}. First of all, the traffic generated by iperf from ...
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0answers
145 views

Cisco 1841 stuck on boot?

I found an old Cisco 1841 router and decided to boot it up to play with it a little. Everything seemed to be going ok but I guess something interrupted the boot. Last line is %SYS-6-...
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0answers
49 views

What spanning tree IEEE protocol does the Cisco 1252AG Aironet access point support?

Link to data sheet We're running Cisco IOS version 15.2(2)JA1. What version of the IEEE STP is supported on the Cisco Aironet 1252AG access points? We are using the "bridge X protocol ieee" command. ...
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2answers
821 views

cisco switch iOS running into problem

I updated Cisco 2960x iOS, but when it started to operate I encountered this error. "Mar 25 12:02:19.878: %ILET-1-AUTHENTICATION_FAIL: This Switch may not have been manufactured by Cisco or with ...
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1answer
634 views

How to enable RESTCONF server in IOS-XR?

I aim to enable RESTCONF server on Cisco IOS-XRv 9000. I did not find online anything about enabling HTTP server in this IOS-XR version. However, with NETCONF server can be enabled. For IOS-XE is ...
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1answer
58 views

Cisco IOS 12.3 - Mysterious NAT - Where is it defined?

I have the following config (IOS 12.3): A.B.C.13 stands for the outside, public IP, bound on interface Fa0/1.52 37.247.X.206 is a public client I am using to test x.x.x.n stands for a random public ...
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1answer
107 views

When configuring a PfR Master Controller, after pointing to the border router, which interfaces are specified?

Ok so hopefully this is a quick answer. All of the explanations on the web I have found have been unspecific in this regard, so I apologize in advance for simplicity. In the example topology, when ...
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1answer
694 views

Problem Accessing PXE server from a different vlan using Cisco switch [closed]

We are having a cisco layer 3 switch and a layer 2 switch. We don't have access to the cisco layer 3 switch(Its access is with higher authorities). I am having a PXE server configured which is ...
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1answer
183 views

Cisco 2851 Router DNS configuration questions [closed]

I'm using a Cisco 2851 Router and configuring through the Cisco Command-Line Interface and I'm trying to block certain https websites. Since I have heard that this router only has support for blocking ...
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0answers
8k views

Adding a secondary address to an interface on a Cisco ASA

On an ASA5505 version 8.2, I have three internal IP subnets that I want to: Pass traffic between as if they were on the same subnet Share the same gateway Share the same VLAN I've been working to ...
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1answer
88 views

I have a Cisco 2921, CIS-3G-ANTM1919D (3G Antenna) is attached to it. Please confirm if this is optimum

psea399#show Cellular 0/1/0 radio history all psea399 03:51:51 PM Thursday Mar 17 2016 UTC 111111111111111111111111111111111111111111111111111111111111 ...
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1answer
232 views

What does aaa mean?

In the below configuration, what does aaa mean? aaa authentication login CON local aaa authentication login VTY group VTY local aaa authentication dot1x default group DOT1x aaa authorization exec ...
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1answer
38 views

Textbook has different order of commands: login password password-value and also password password-value login Does the order matter?

Textbook has different order of commands: login password password-value and also password password-value login Does the order matter? Cisco switch

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