Questions tagged [cisco-ios]

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

Filter by
Sorted by
Tagged with
-1 votes
2 answers
48 views

Can I get into configuration mode by command "config" instead of "configure terminal"?

I would like to ask: When I configure router or switch in for example Putty, can I get into configuration mode by command "config" instead of "configure terminal"? Or I need to use ...
Mirek's user avatar
  • 1
0 votes
1 answer
53 views

Can't ping between cabled interfaces on different VRFs on same switch (Cisco 3548)

As an experiment I've created a non-default VRF, directly cabled between an L3 port on the default VRF and an L3 port on the non-default VRF, and am trying to ping between them. Neither interface can ...
Kevin's user avatar
  • 101
0 votes
0 answers
12 views

Fast port connection and ability to daisy chain unmanaged switches on Cisco Catalyst [duplicate]

I have a Cisco Catalyst 2960-S that I use in a home environment. In the configuration I currently have (very basic, basically just switchport mode trunk on upstream and switchport mode access on reset ...
drcomputer's user avatar
1 vote
0 answers
31 views

Set promiscuous port for upstream LACP trunk on Cisco 2960X

I have a series of clients who are looking into a intra-VLAN isolation scheme to satisfy a DDQ request. I was looking into deploying private VLANs for all client device / voice VLANs to satisfy this ...
Moridn's user avatar
  • 11
0 votes
1 answer
35 views

Unable to configure Site to Site VPN between Cisco Router & Cisco ASA and permit SSH

I am performing configuration on Cisco ASA and Cisco Router from the packet tracer. I am attempting to allow the external network (172.16.22.100 255.255.255.0) to access the internal server which is ...
iloveearth_12345's user avatar
0 votes
0 answers
30 views

Cisco switch ios update without change license

I need the following ios switches to be updated to the latest "license-free" version to fix vulnerabilities: C3560CX-12pd-S C3650-48PS-E C3850-12S-E C3850-24T-E C3850-12S I didn't find any ...
khatabakhshnadia's user avatar
0 votes
0 answers
48 views

Using ACR (adaptive clock recovery) across pseudowire

I am using back to back Cisco 2941s (mwr2941-adviprank9-mz.151-3.MRA3) in the lab to attempt to establish a pseudowire circuit for T1 delivery. I am trying to establish timing by using adaptive clock ...
A. Herron's user avatar
0 votes
1 answer
40 views

Does this DHCP Server need a trusted ARP Inspection port in IOS?

The switch runs Cisco IOS. You want to configure security on Switch 1. The objective is configuring Dynamic ARP Inspection on Switch 1. Which Ports or port will you configure as Trusted? A) None of ...
Atheesh Thirumalairajan's user avatar
0 votes
1 answer
168 views

Will an OSPF route in IOS be preferred over a static route? (It isn't Floating Static)

For the network topology attached in the image, a static route is configured with ip route 10.10.10.0 255.255.255.252 Ethernet0/0. Referring to the Topology and the output from the show ip route ...
Atheesh Thirumalairajan's user avatar
1 vote
1 answer
251 views

Cisco port channel identification through SNMP

on a cisco switch is there any way to identify, through SNMP queries, which interfaces are involved and configured in a port channel? I did some experiment with commons MIB, without result. Any idea? ...
Gianluca's user avatar
  • 371
1 vote
1 answer
86 views

Cisco 4500x configure fast-hello interface with multiple ports

I have a pair of cisco 4500x-32 and i configured VSS between then but i am using just 1x 10G interface for fast-hello packet and here is that interface configuration: interface TenGigabitEthernet1/1/2 ...
Blackmetal's user avatar
2 votes
2 answers
131 views

Cisco IOS - how can I make the guestshell be reachable via VRF?

I am currently trying to set up a cloud application on the guestshell of an ISR4331. It installs a connector that needs to have connectivity to the internet. I assume the issue is not specific to what ...
Flying Thunder's user avatar
0 votes
1 answer
820 views

Configure NCS540 IOS XR router works as Layer 2 switch

I have an NCS 540 Router and would like to config it as an L2 Switch. In the diagram, PC2 and PC3 should get the IP addresses from pfSense(DHCP and DNS). How can I setup the trunk port for the NCS540 ...
Anthony's user avatar
0 votes
0 answers
29 views

Cisco Firewall 5512 NAT cause IP randomly mapping to the host

I have an ASA 5512 firewall that has configured with 2 public IP addresses. I use static nat to explosive https service and use PAT to allow my DMZ web server to access the Internet. The CLI are shown ...
kswen's user avatar
  • 1
0 votes
0 answers
54 views

Is there a password policy configuration for setting up expiration date on cisco IOS?

Even I tried to find it from cisco homepage.. It seems it doesn't exist. Is that only possible to set up on TACACS+ or RADIUS?
Myung Seok Kang's user avatar
0 votes
1 answer
93 views

GNS3 Router Telnet Configuration

I configured the IP address and telnet for my Cisco router but on GNS3 it shows a different IP address. When I ping the router from my Ubuntu virtual machine using the IP address I configured the ping ...
James's user avatar
  • 1
0 votes
0 answers
196 views

Show on a Cisco 3850 Switch if a new IOS is installed

We have some Cisco 3850 that we never get downtime to do software upgrades (current uptime of switches is over 4 years). Tomorrow there is power works in the room so these switches will lose power so ...
The Footsie's user avatar
1 vote
2 answers
266 views

What interfaces does a Cisco iOS Router allow SSH Console access on?

I am have trouble understanding how Cisco iOS maps console access services like SSH to IP addresses. Assume the following: There are no acls blocking traffic There is the typical SSH server ...
Liam Kelly's user avatar
0 votes
1 answer
322 views

Naming ASN something else than "default", Cisco IOS XR

I'm trying to configure a BGP and VRF (for a L3VPN) on a Cisco ASR9000 router, as per this tutorial. I'm on the first section ("Configuring Multiprotocol BGP on the PE Routers and Route ...
Pat Res's user avatar
0 votes
1 answer
269 views

How to change the AS number without losing the old BGP configuration?

I use Cisco with IOSv and would like to change AS number without losing the old BGP configuration.How to change the AS number without losing the old BGP configuration?
user85499's user avatar
0 votes
1 answer
408 views

What could be blocking ARP?

I have a metro ethernet link between two offices with Cisco C3560X's on each end. Actually, I have two links. (We are switching from one provider to another.) I can't get the new link to work. Pinging ...
longneck's user avatar
  • 464
0 votes
0 answers
99 views

Admin IOU L3 switch

Problem with IOU l2 switch By Konstantinos Dimos July 31, 2022 at 3:12 UTC Hi, under Ubuntu 22.04 LTS, gns3 and local server I am trying to manage switch IOU L3 switch, although at the begining I was ...
konstantinos Dms's user avatar
1 vote
1 answer
351 views

how to limit or block broadcast traffic on ASR920 service instance EVC

I don't want to turn off all port, I want to block completly broadcast traffic, or the best to limit rate to 500 pps broadcast, all more to drop. Is there any way to do it on Cisco ASR920? I have ...
pad19's user avatar
  • 31
2 votes
0 answers
424 views

Cisco Access Switches: Monitoring AAA server dead via SNMP?

This is a new setup of Cisco access switches (2960S, 2960X IOS with 15.2(2)E9, but mostly C1000 with IOS 15.2(7)E*), with a Cisco ISE 3.0 as authentication server for 802.1X, config style is to be ...
Marc 'netztier' Luethi's user avatar
0 votes
1 answer
166 views

BGP Protocol configuration between two VPC

I would need to configure a cross connect between two VPC networks via SFP Fiber. Unfortunately I'm new on BGP configuration and would need confirmation that I'm doing it on the right way... I have ...
tiamat's user avatar
  • 103
0 votes
1 answer
2k views

Cisco ASR 1001 transceivers not working

I've a Cisco ASR 1001 v03. When it got to my hands it wouldn't save the config after reboots, after some research I found out the config-register had a wrong value and it was fixed by running ...
Dane411's user avatar
  • 123
3 votes
1 answer
396 views

Cisco 9400-Supervisor Engine 1XL uplink help

I have inherited a Cisco 9400 with 6 line cards installed. I am trying to use some ports on one of the cards. I noticed that there is no link activity lights, no indication of any activity. I think ...
jim's user avatar
  • 85
1 vote
1 answer
109 views

Cisco 4500X TCAM question on PBR

I have a pair of 4500x in VSS mode and i have 100-150x SVIs and i have PBR under those SVIs and i am changing their next-hop, i want to know PBR and changing next-hop happens in TCAM, hardware or it ...
Blackmetal's user avatar
0 votes
1 answer
76 views

Cisco ACL Entries

I have a cisco 4500x and n5k-5672up and in their datasheet mentioned that we can have "Security ACL Entries (1K=1024) 128K (64K ingress and 64K in egress) Shared with QoS" for 4500x and &...
Blackmetal's user avatar
1 vote
0 answers
91 views

TACACS Through ASA L2L Tunnel

Hello see below network diagram. I am trying to configure the Branch Router (10.1.1.1) to use TACACS AAA on the HQ-AAA-Server host (192.168.10.10). TACACS works fine for the Branch-FW1 ASA device ...
DavidM's user avatar
  • 171
2 votes
0 answers
270 views

Problem with BGP aggregate-address behavior in IOS when a large number of OSPF routes update all at once

We have a Direct Connect setup to AWS using BGP. We are running a ISR4451 with IOS XE 16.03.06. I have a strange situation where the AWS BGP neighbor drops our connection with the notification: ...
Appleoddity's user avatar
2 votes
1 answer
318 views

AAA Authorization on IOS

Still working away on a project (not for real life deployment so don't worry about seeing passwords). I have a Tacacs server set up for centralised AAA. I am trying to set up two users, "admin&...
DavidM's user avatar
  • 171
1 vote
2 answers
486 views

events log in cisco

Is there log file just like events file in windows showing what happened,who did what, kind of ? I could not see with show archive log.some switch goes down and support guys plug off/on cisco switch, ...
hakkican's user avatar
  • 145
1 vote
0 answers
414 views

Route-map to manipulate metric in EIGRP

I have following Setup R1 --- R2 --- R3 --- R4 --- R5 The same network is being advertised from R1 and R5. There is some difference in delay between the two paths R1-R2 and R4-R5. So the route from R1 ...
Mario Jost's user avatar
  • 1,700
4 votes
3 answers
306 views

IOS Memory allocation error after ping

I have written a script in Tera Term for a Cisco IR809g which pings 3 different routers(IR 809g) in 2 different networks over the cellular interface. After +- 6 hours I'm getting a Memory allocation ...
LucidLynix's user avatar
0 votes
0 answers
91 views

Update IOS on Cisco CGS2520 Switch

I need to update the IOS on a Cisco CGS2520 Switch. Not stacked, single switch I have never done this before and I have a couple questions. I do not have physical access to the switch. Looking at the ...
James Connigan's user avatar
0 votes
0 answers
157 views

How do I load VLAN database between switches (CISCO 2960)?

I glad for any help on this topic -- netanel
netanel shteren's user avatar
0 votes
2 answers
69 views

Client's ARP requests affect whether Cisco C897VA receives packages or not

So I have bought used ISR C897VA with an issue: when vlan1 is pinged from windows there are quite a lot of "Request timed out"s. Config-register 0x2142 has been done, as well as resetting ...
Qeeet's user avatar
  • 103
0 votes
0 answers
841 views

No Voice commands on cisco router

I cannot find voice commands on my router, I have licenced it but no voice commands or sip are found Its on packet tracer. Cisco router 2911 Thank you
Garp's user avatar
  • 1
0 votes
1 answer
786 views

Addresses in router's subinterfaces overlapping [duplicate]

I can't really understand why I'm getting overlapping addresses in subnets when they're between the allowed range. I have the network 192.168.1.0/24, and I have to create 3 subnets: A - 58 Hosts B - ...
Dasph's user avatar
  • 135
0 votes
1 answer
67 views

How to query which line I am configuring in a Cisco router?

The Cisco router prompt shows only that I am configuring a line: config-line. How can I make IOS to print exactly which line I am configuring?
Gergely's user avatar
  • 103
1 vote
1 answer
290 views

ARP sending an ARP request on changing port IP address

Using the c7200 images on GNS3. I configured two routers as so: With arp debugging on, after assigning an ip address I see that each router sends a gratuitous ARP response packet (only debug output ...
Zee's user avatar
  • 35
0 votes
0 answers
178 views

Cisco DHCP using dynamic updates

I would like to use a configuration on a Cisco router that allows for clients to resolve the names of other clients without the use of mDNS. I have following configuration: roTST01#show running-config ...
Mario Jost's user avatar
  • 1,700
0 votes
0 answers
609 views

Can ping from VPC 1 to router and VPC2, but can't ping from switch to VPC2 or router

I have a simple, linear topology in GNS3 that goes like this. VPC1 > Switch > Router > VPC2 I have the default static IP Routes on the router set to 0.0.0.0 0.0.0.0 Ethernet0/1 and Ethernet1/...
Dasph's user avatar
  • 135
0 votes
1 answer
182 views

How to stop automatic entry as privileged exec from console login?

I am configuring my Cisco router and trying to set up access levels. I was under the impression that level 0 was a very limited mode which almost only allows users to enter the enable command to enter ...
Dasph's user avatar
  • 135
2 votes
2 answers
335 views

Unable to add an abbreviated IPv6 to a Cisco router

I am very new to networking and playing around with GNS3. I am trying to configure a router to have 2 IPv6 addresses in a single interface (as far as I understood, this is possible with IPv6) I ...
Dasph's user avatar
  • 135
0 votes
1 answer
107 views

IP Source Guard On Static Networks

I am running a set of Cisco C9300s. I have them configured with ip dhcp snooping, and ip arp inspection with ip dhcp snooping trust and ip arp inspection trust set on the fiber link between the 2 ...
JukEboX's user avatar
  • 461
0 votes
1 answer
215 views

In France , what language is the Cisco IOS for routers and switches?

If I accept a Network Engineer job in France, what language will the Cisco , Juniper, etc, IOS communicate in? If it is in French, is there an acceptable workaround that I can install in routers that ...
mrome74's user avatar
0 votes
1 answer
190 views

Why does a Cisco router advertise a prefix with NDP RA when it has an address in that range?

If I write interface Vlan1 ... {ipv4 config} ... ipv6 address 2001:DB8:5432:101::/64 eui-64 ipv6 address FDAA:DB8:5432:101::/64 eui-64 ipv6 enable ipv6 nd prefix 2001:DB8:5432:101::/64 ipv6 nd ...
Scruffy's user avatar
  • 103
0 votes
2 answers
314 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 ?
DeathS7roke's user avatar

1
2 3 4 5
12