Questions tagged [cisco-ios]
For discussion about Cisco's Internetwork Operating System - Cisco IOS
43
questions with no upvoted or accepted answers
9
votes
1
answer
2k
views
How to break apart an IPv6 /56 6rd delegated prefix from ISP into multiple /64 VLANs for use with SLAAC EUI-64? [Cisco]
I have CenturyLink Internet service, and they have a 6RD IPv6 deployment where they hand out an IPv6 delegated prefix /56 block to me and allow me to use it as I wish. My Cisco ISR router receives the ...
5
votes
0
answers
174
views
Redundant physical interfaces for Cisco pseudowire-class
I have a link which is LT2P from a site router R1 (Cisco 867-VAE, IOS 15.3) which has two external interfaces defined (dialer1 and vlan-1000), but only one plugged in (first is ADSL, second is ...
- 16.2k
5
votes
0
answers
339
views
IOS XE minimum frame size
I recently encountered an issue upgrading from an IOS device to an IOS XE ASR 1000 router concerning Ethernet Over SONET (EOS). VLAN tags are used to map traffic from the hub router to SONET ...
- 666
4
votes
0
answers
1k
views
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, ...
- 131
2
votes
0
answers
486
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 ...
- 8,836
2
votes
0
answers
278
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: ...
- 123
2
votes
0
answers
4k
views
Cisco AIR-AP1852i-E-K9 stuck in "waiting for uplink[...]" after startup
I pulled an old cisco AP from a shelf today at work to test something, and after starting up and connecting with PUTTy, i was greeted with (after startup), this - repeating over and over:
[*02/16/...
- 163
2
votes
0
answers
1k
views
NVI based NAT on Cisco ISR terrible performance
I am trying to experiment with a Cisco ISR 1841 and have configured NAT on the device. The intention is to simulate it being a broadband router. I understand that this is not the best performing ...
- 181
2
votes
1
answer
191
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 ...
- 526
1
vote
0
answers
39
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 ...
- 11
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 ...
- 171
1
vote
0
answers
435
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 ...
- 1,709
1
vote
0
answers
81
views
Upstream QoS garanteed bandwidth
In the network I'm trying to manage there is a satellite link, the upstream of which is ~ 7 Mbps. In this upstream, I need to allocate 1.5 Mbps of guaranteed bandwidth for one single host, but nothing ...
- 45
1
vote
0
answers
350
views
Configue IOS DHCP server to respond to Option 60 class
I have a number of small networks each with about half-a-dozen mostly-fixed hosts. The routers on each network provide DHCP service for the occasional visiting engineer's laptop. I am adding IP ...
- 16.2k
1
vote
0
answers
101
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 ...
1
vote
0
answers
567
views
Query on Cisco IPsec Licensing, HSEC-K9
I'm currently debugging an issue with IPsec tunnels and it seems like one of our client's NW engineers didn't install the HSEC-K9 license.
The issue is that the new IPsec tunnels are not coming up ...
- 1,412
1
vote
0
answers
333
views
Amazon AWS VPN Bidirectional Device Access
After setting up an Amazon VPN connection and configuring my gateway using the downloaded configuration, I am able to directly ssh to the private IP of an EC2 instance in my VPC.
However, both the EC2 ...
- 11
1
vote
0
answers
1k
views
ASR1006 IOS upgrade with ISSU
We were running Cisco ASR 1006 on single RP2/ESP since long time but today two purchased secondary (standby) RP2/ESP for redendency. Now question is how do i upgrade IOS on secondary RP2?
I am ...
- 4,379
1
vote
0
answers
692
views
Packets are disappearing
I have a server HP DL180 G6, connected to a Cisco switch (4948E or 2960).
The server have 2 ethernet ports and ILO shared with data port #1.
ILO setted up to request ip from DHCP.
1) When I connect a ...
- 36
1
vote
0
answers
635
views
VPN tunnel with duplicate subnets
I have been tasked to setup a VPN tunnel with an external party's network, but I hit a bit of snag.
I am currently running a Cisco ASA 5510 with private subnets of 10.1.2.0/24 on the "inside" network....
- 11
1
vote
0
answers
326
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 ...
- 51
0
votes
0
answers
20
views
What is generating the /isan/etc/dcos_sshd_config file?
I posted this on the main stack overflow page, but then I remembered that this niche existed. Figured it was worth a cross-post...
During a recent Nessus security scan at work, some of our NX-OS ...
0
votes
0
answers
32
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 ...
0
votes
0
answers
52
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 ...
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 ...
- 1
0
votes
0
answers
58
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?
0
votes
0
answers
208
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 ...
- 383
0
votes
0
answers
109
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 ...
0
votes
0
answers
95
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 ...
0
votes
0
answers
160
views
How do I load VLAN database between switches (CISCO 2960)?
I glad for any help on this topic
--
netanel
0
votes
0
answers
878
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
- 1
0
votes
0
answers
198
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 ...
- 1,709
0
votes
0
answers
631
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/...
- 135
0
votes
0
answers
64
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
...
- 1,033
0
votes
0
answers
47
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-...
- 666
0
votes
0
answers
1k
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/...
- 311
0
votes
1
answer
256
views
Issue w/ Cisco router and failed NAT and static default route
I have a cisco router that is using a VRF to support a site to site VPN tunnel. I have added a second network to the router for non-VPN standard internet use. My problem is that my default static ...
0
votes
0
answers
173
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 ...
- 85
0
votes
0
answers
157
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 ...
- 536
0
votes
0
answers
227
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 ...
- 145
0
votes
0
answers
420
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-...
0
votes
0
answers
64
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.
...
- 305
0
votes
1
answer
68
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 ...
- 101