Questions tagged [cisco]
Cisco is a provider of switches and routers to commercial consumers. Cisco devices run IOS or NX-OS operating systems. This is a generic tag to be used when no more specific tags are available. See the partial list of tags in the full Tag Wiki.
2,632
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How to check total operating hours for Cisco Catalyst switches?
We bought about 25 Cisco Catalyst (9300 & 9500) switches and about 200+ SFPs from a distributor with whom we've had trouble in the past - i.e. they sent us refurbished hardware when we ordered new....
- 195
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40
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L3 Switch/GW with Redundancy over 2 rooms needed [closed]
We currently use 2 Cisco C9200L (L2+) switches in a Stack as GW for our internal network.
We have several subnets, put into separat VLANs.
These C9200L are the GW for all vlans and then forward to the ...
-1
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0
answers
22
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How to use cisco 7965 ip phone in diffrent subnets
I installed and configured an Isabell system and it is working very good with my soft and hard phone in the same network.but as soon as I move one of my cisco 7965 ip phones to my second site with ...
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1
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54
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Rsyslog not writing any logs from Cisco network devices - all other remote syslog works fine
tcpdump confirms valid syslog is coming in from multiple remote systems - servers and Cisco network equipment.
OS is Linux RHEL 8.8
The servers all come in fine and write to disk, and are shown as ...
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23
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ED137 SIP & RTP (VoIP) for Air Traffic Control Use with Cisco CUBE
I am working with an air traffic control client who is using a variant of SIP called ED137.
There are 2 main uses, Ground to Ground (basically telephone calls) and Air to Ground to Air (radio traffic ...
- 101
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1
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17
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Cisco IOS - mapping out ports with arp, mac-address table, and interface status
I've unfortunately been tasked with determining which switchports connect to what- be it a connection to another switchport, or a link to a host. Basically determine what each port is connected to, ...
- 230
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40
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Cisco IOS/XR/NXOS, determine what's plugged into each port using arp, interfaces, and mac address-table
I need to try to map out the access layer switches for this environment, and determine what each port is currently being used for. My ultimate goal here is to determine the IP address/hostname of the ...
- 230
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21
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Internet failover on Cisco ASA 5500 series Primary ISP is on DHCP address and so is backup. Always defaults to backup
I had SLA MONITOR setup on my ASA and working fine for months. All traffic was routing through my primary connection. I rebooted my ASA after a firmware upgrade.
When it came back, it would always ...
- 11
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0
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34
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Intermittent workstations with no network connectivity
I have a campus wide network with ~10 workstations around campus(not from the same switch) that can't connect to the internet/network, they are successfully acquiring an IP address from the DHCP ...
- 11
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1
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165
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Connection reset by 10.180.20.1 port 22
Using a CentOS 7.9.2009 server I'm trying to ssh v1 using client with v2 into a Cisco router that has SSH v1 (can't be upgraded, I'm anticipating that).
I then modified my ssh_config file to allow for ...
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116
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Werid ESXi host mac flapping issue
We have some standalone ESXi hosts in our company. Recently we encountered a werid issue where the mac address of the ESXi host flapping.
Issue description:
I found that the IP of some esxi hosts will ...
- 11
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answers
67
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Clear Cisco Stack-Ports "Changes to LinkOK" statistic
On Cisco switches with stacking cables, you can do:
#show switch stack-ports summary
Sw#/Port# Port Status Neighbor Cable Length Link OK Link Active Sync OK #Changes to LinkOK In Loopback
...
- 6,553
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1
answer
45
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How to properly include vlan configuration for preexisting OSPF routing in PT
I am using packet tracer to simulate an enterprise setting.
There would be a "main" office (marked as Bgta) and other minor offices in other cities, such as Mdlln. In the main office there ...
- 1
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0
answers
60
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Disable Cisco Router syslog messages
I am trying to disable syslog messages from showing in my cisco 1kv tty. The conundrum is terminal monitor has a single command to set the logging level #logging terminal <severity>, and if I ...
- 15
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1
answer
270
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ansible backups for cisco asa devices: ERROR: % Invalid input detected at '^' marker
I have been tasked with backing up all of our network devices, so natuarally I chose ansible. I am no expert but I sure need help on this one! I have tried everything under the moon and cannot ...
- 3
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2
answers
668
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Ansible :: Am I not using the `cisco.ios.ios_facts` module?
I'm trying to build a simple POC ansible playbook that logs into a Cisco router and pulls the config. About my environment:
My Ubuntu is Ubuntu 18.04.5 LTS
My Ansible is version ansible 2.10.7 (...
- 131
1
vote
1
answer
266
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Ansible to a Cisco Router :: Password Message Messing Up the Connection?
When I manually SSH from my Ansible server to a Cisco router, I see this on the command line:
me@ubuntu01:~/ansible$
me@ubuntu01:~/ansible$ ssh [email protected]
Password:
####################### ...
- 131
2
votes
1
answer
164
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I need help to achieve (as close as possible) 40G network transfer speed (~1250 MB/s x 4)
I had a Gigabit network, which I upgraded recently to 40Gbps.
To do so, I replace my TPLINK switch with a Cisco Nexus 9396PX switch, which has a module with 12x 40G ports. The 40G network ...
- 21
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250
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Configure DHCPv6 on a Layer 3 Switch
I am training under Packet Tracer and I would like to be able to assign IPv6 addresses to my VLANs using a Layer 3 Switch as a DHCPv6 server (Between Layer 3 Switch and PCs there is a normal Switch). ...
- 11
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32
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Cisco 3860 is not honoring write mem or copy running-config startup-config
I have a Cisco 3860. I have configured it so much that I have it all memorized and down to a couple minutes at this point.
I configure the switch and everything works.
I add my trunk port
I add ...
- 101
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0
answers
31
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Unable to find Mac address on any switch
Cisco switches.
Version 12.1(22)EA2
I have a printer downstairs that is on the wrong vlan, previous admin set vlan by switch port, but didn't label the patch panels so I can't find which one the ...
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120
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Cisco UCS C220 M4 PSU Fault In Diagnostics
Hello fellow Sysadmins.
A C220 M4 with the latest recommended firmware I am working on displays the following fault messages on latest version diagnostics at Server Health:
PSU1 PSU1_PWRGD: Power ...
- 13
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0
answers
19
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connecting cisco 931 to Palo Alto Global Connect VPN
I'm trying to connect a cisco 931 (with VPN license enabled) to a Palo Alto (PA) Global Connect VPN Server by trying to create an IPSec VPN Tunnel.
I feel I'm missing something here:
The following ...
- 50
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0
answers
147
views
SCP on Ubuntu OpenSSH Server for Cisco backups
I am having a bit of an issue and I believe I need some help. We have an On-prem SFTP server which will be deprecated soon, so in the mean time I need to set up another SFTP option in AWS running on ...
-1
votes
1
answer
63
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Cisco ASA to Watchguard
I have never worked with watchguard firebox firewalls in depth before and we are replacing a Cisco ASA 5515 with a Watchguard M390. I am having a hard time interpreting the configuration settings in ...
- 1
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2
answers
168
views
Insecure Connections With CA Issue Certificate
I have imported a web server certificate from a CSR coming from my Cisco C9300. The certificate came from the Certificate authority and shows the correct CA on the end of the chain. CLI shows that the ...
- 835
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43
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Configuring Routers using IRRToolset/IRR Power Tools
Recently, I've started configuring routers using irrpt.
It offers the features I require, which are described in the section under "Purpose" (https://github.com/6connect/irrpt#purpose).
But ...
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1
answer
81
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FTP performance issues - VMWare, cisco etc
We are experiencing FTP performance issues. Looks like speed drops dramatically the more hops we are away from the server.
Cerberus FTP server, running on VMWare. 2 machines on the same VMWare host ...
- 21
1
vote
1
answer
125
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Ansible: Pulling a specifc piece of information from an output
I'm trying to grab some information from the output of a playbook and save in a file for review. tor.j2 is just a list of expected lines in the config: logging , ntp, spanning-tree, etc.
tasks:
- ...
- 11
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212
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High Packet Loss on Device when Plugged into Unifi Network
We have 3 large format projectors of the same model on our network all plugged into a small switch. Recently, we have been unable to reliably load 2 of the 3 projectors' web management pages. Further ...
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368
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Possible STP Issue with Cisco SG350 Switches
we are having a weird issue with a network of Cisco SG350 Switches that I cannot figure out. We are thinking it may be related to STP but have verified all the normal problem points (i.e. proper ...
- 11
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0
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35
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How do you prove RFC 791 - Internet Protocol
We are being asked to prove we are using RFC 791 (Internet Protocol) within our network. How does one prove such a thing via documentation if there is no such document from the vendor stating as much....
- 135
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0
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865
views
Can't ping or traceroute through EC2 using AWS Site-to-Site VPN to Cisco ASA
My VPC is connected to Cisco ASA, tunnel is shown to be UP in the AWS console.
What is working:
The engineer on the Cisco side has successfully pinged my EC2
instance within my private 10.5.0.0/17 ...
- 101
1
vote
1
answer
395
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Blocking SSH access from WAN side of CISCO 890 to management plane
I've been round about the houses with this one for days, i've not found a solution yet that works. I haven't found a way to block the HTTP access to the management plane either, i had to give up and ...
- 121
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0
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48
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I can't PING to my Cisco router when I try to access the domain server
I have this network image
I tried to connect the pc1 to the domain (in Windows Server 2012).
To do that I tried to PING from pc1 to the server and that works.
After that I go the pc1(Windows 7) and I ...
- 109
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0
answers
144
views
Linux is answering (wrong?) to Gratuitous ARP message
I've a Centos 7 Linux server with 2 physical interfaces, each of them has 2 subinterfaces, which are P2P /31 interfaces two Cisco. After changing neighboring Cisco devices Linux router started to ...
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1
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209
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How can I download the cisco running config to my C drive's folder?
I am going to download the running config from the cisco router.
I have tried the following command, but it needs to change the account's privilege level to 15 for downloading the running config. I ...
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0
answers
162
views
Cisco Switch - Enable Telnet using HTTP
I'm trying to automate the configuration process of a Cisco switch (SG-300).
I was able to automate everything I need using telnet, but the last issue I still have is to enable telnet itself.
For now ...
- 103
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0
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88
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2 default gateway to one subnet. One gateway in security device and other one in 2960 XR switch
Subnet 10.3.20.0/26 connected to switch (multilayer) through a vlan. Same vlan there is no svi in that switch. This vlan extended to Asa one interface and gave one ip address and that IP address is ...
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1
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764
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Bad mask /30 for address 10.1.1.3 || Cisco P.T
So basically I'm having this issue while trying to configure the serial of 3 routers (router0, router1, router2) on Cisco Packet Tracer
I was able to configure both serials for router0 following this ...
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votes
1
answer
888
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ISC DHCP Server - Matching client identifier won't work for single device
I hope someone can help me with this problem.
What am I trying to do
I want to provide information to a Cisco ASR1k depending on its serial number.
Reason for this is I don't have any MAC address of ...
- 101
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1
answer
205
views
Best way to reformat a JSON with Ansible?
I have this JSON in a variable :
{
"device_vlans": {
"1": {
"name": "default",
"interfaces": [
"GigabitEthernet1/...
- 91
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1
answer
20
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I need to figure out how to buy a used server. What is the thing called that pulls out from a stack server an has a screen on it an keyboard?
I want to buy the computer that technicians use to repair or configure stack servers it looks just like a laptop but has hot swappable harddrives. I'm entering a i.t. program an I'd like to mess with ...
1
vote
2
answers
2k
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Line protocol on Interface GigabitEthernet1/0/1, changed state to down
My switch is permanently changing the state of port GigabitEthernet1/0/1 from up to down and from down to up. What can I do?
Console Output:
Port configuration:
Sorry, I have only these pictures.
I'...
- 11
1
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1
answer
594
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How to connect to a Cisco VPN in "native mode"?
I need to connect to a VPN, but I am not an expert on the subject at all, so if anyone can help me, I would appreciate it.
I was given the following data, telling me that this info is for a "...
- 161
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3
answers
411
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Propagate local time over NTP to LAN
I have synchronized my L3 switch to an external time server, this is working correctly. However I'm in Europe and we have CET/CEST switching and I get UTC from the configured time server. I did setup ...
- 1
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2
answers
1k
views
How do I upgrade Firmware on Cisco SPA50X VOIP Phone?
I downloaded the latest Firmware for my Cisco SPA504G. However, the usual .exe file used to perform the upgrade was not bundled with new firmware. Nor did the release notes provide any clues about how ...
- 365
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1
answer
43
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how to enable intervlan between juniper core switch and Cisco catalyst 1000
i have a juniper 4600 core with 2300 Access switches in my VLAN, one of the 2300 failed and replaced with cisco 2300 in one VLAN, DHCP is assigning IP to clients and internet is working fine, the ...
0
votes
1
answer
432
views
Connecting Azure Site-to-Site VPN to On-prem Gateway with 2 public IP's
I have a cisco ISR on-prem with 2 endpoints (primary and secondary) and I want to connect my Azure VPN Gateway to both endpoints through a single connection (same local address space for both IP's).
...
- 155
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votes
1
answer
32
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Trunking between two Cisco 3750s to another desktop switch
So I'm trying to scrape all the memory I have from college where we used Cisco almost a decade ago, but I haven't touched them since then. I'm trying to clean up our internal network a little bit ...
