Questions tagged [cisco]
The major provider of networking equipment. This is a generic tag to be used when no more specific tags are available. See the list of tags in Help Center Tag page.
3,763
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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 ...
- 101
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votes
1
answer
56
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Is it safe to enable jumbo frames on switches in general
Can any harm occur by simply enabling jumbo frames on your switch infrastructure?
I understand that in a given flow from one machine to another all participants need to support jumbo frames to arrive ...
- 153
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44
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noob learning cisco
I'm trying to teach myself how to use cisco devices. i was given an router, switch and firewall. so far i been able to set up vlan and have intra vlan routing working. My issue is having the switch ...
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12
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Netconf filter to get the access vlan of each switchport interface [closed]
Wondering if anyone has any filters i can use to get the access vlan associated with all the switchport interfaces on a switch. I am using python's ncclient to connect to the device.
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14
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Cisco switch how to pass password via SSH cli [closed]
I created a new user to login via RSA Key, and this works.
But I'm going to find a way to somehow be able to pass the enable command's password in one command.
Suppose I want to save the output of ...
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1
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48
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Build custom image for CISCO devices
Do CISCO devices support custom image building or deploying custom plugins?
OpenWrt has such feature.
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52
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Cisco: 9606R Switch Firmware update
I have updated my other Cisco 9300 switches, but am a bit confused on how to even select the right firmware for my Cisco 9606R Core.
If I run sh ver it displays the following:
Cisco IOS XE Software, ...
- 1
1
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1
answer
41
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The TTL and packet drop [duplicate]
I would just like to verify one thing. When a router receives a packet with a TTL of 1, the router can still process and accept it if its destined for itself, correct? Because for example, eBGP ...
- 783
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90
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Looking for sanitized Cisco IOS XR configurations
I'm looking for someone who can answer with a sanitized Cisco IOS XR text configurations.
These configurations will be used to test ciscoconfparse config parsing, specifically to start working on ...
- 29.9k
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2
answers
54
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Setting FortiGate HA Firewall
I need some advice and guidance regarding setting up the FortiGate HA, My question is focused on WAN side of configuration (not A WAN expert), below are highlight environment
2 ISP WAN-A / WAN-B
...
- 1
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2
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43
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Interface is down/down but internet works
I am managing a network at my company. A patch panel provides connections to the switch, which is connected to the router.
One of the connections on the switch does not display a blinking green light. ...
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1
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29
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Disable the --more-- prompt in Cisco CLI
show startup-config:
!
line con 0
login local
length 0
line vty 0
exec-timeout 0 0
login local
length 0
line vty 1 4
login local
length 0
line vty 5 15
login local
length 0
!
However I still get ...
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2
answers
60
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How to apply a Route-Map to a NAT connection
I am following a tutorial about route-maps on youtube. https://www.youtube.com/watch?v=2YlsXcT1Pjw
There is this topology.
The default route on R1 points to 10.10.10.2
In the video he just shows how ...
- 15
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1
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46
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Configuring multiple public IPs in Cisco 881 to forward private IPs with tags while bandwidth balancing [closed]
The ISP is sending four tagged public IPs (VLAN 30) through one WAN cable. Currently, this cable is connected to a switch that recognizes the tag and distributes it appropriately. Naturally, a router ...
- 103
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1
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37
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Cisco VLAN Taking up Entire Subnet
I have a default vlan 1 that has an IP configuration of 10.20.11.0 with a subnet mask of 255.255.255.0.
I have an AP 10.20.11.55 that I want to place on its own VLAN because I intend to make this AP ...
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1
answer
40
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How do i add a gateway for a L2TP Tunnel?
Maybe the question title is kind of odd but i dont know how to describe my problem. I have this setup.
[Client1]=eth1= --> =fa1/0=[ R1 ]=fa0/0= --
|...
- 15
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1
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75
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Cisco IOS Privilege Escalation Vulnerability Workaround
For this Cisco vulnerability that they have discovered it states that
If the ip http server command is present and the configuration
also contains ip http active-session-modules none, the
...
- 383
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27
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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
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0
answers
98
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Cisco nexus 9336-FX2 ETHPORT-5-IF_DOWN_LINK_FAILURE
I am seeing following error on 100G interface. (SFP bought from fs.com)
nxos version 9.3.10
2023 Oct 11 00:41:12 spine-1 %ETHPORT-5-IF_DOWN_LINK_FAILURE: Interface Ethernet1/4 is down (Link failure)
...
- 4,371
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37
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JunOS tagging aggregate route from more specific route - bgp communities
I have a certain use case with rtbh for the following:
A /32 route (say 10.1.1.1/32) is injected into the network with a specific bgp community
I'd like to match the aggregate prefix that /32 belongs ...
- 1,388
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24
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Need assistance with Cisco Firepower 5516X: Excluding a single IP from a specific Snort rule
I'm currently managing a Cisco Firepower 5516X device and have encountered a false positive for a specific Snort rule. Instead of disabling the rule for all traffic, I would like to selectively ...
- 1
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53
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CCNA OSPF Loopback as the router ID
FYI, I am studying for the CCNA and new to this.
The scenerio, 2 routers R1 and R2.
R1 Loopback IP as 192.168.0.1
R2 Loopback IP as 192.168.0.2
Using the loopback IP's as the router ID.
I provisioned ...
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51
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Globally raise IP ARP inspection limit rate on Cisco
I am trying to raise the ip arp inspection limit rate from the default rate of 15 on my Cisco 9300 since I am getting to many %SW_DAI-4-PACKET_RATE_EXCEEDED: x packets received in xx milliseconds ...
- 121
1
vote
1
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99
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Cisco ports shutting down temporally due to arp-inspection
We have a couple of Cisco 9300 switches. We had the switch configured using STIGS. A couple users have complained that their Avaya phones restarted. I started running the show logs and noticed the ...
- 121
1
vote
2
answers
359
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Cisco Console Port to 1 Port Ethernet Breakout
I was thinking about making it a bit easier to access the console port on a few switches deployed at work. Basically these switches are located top of rack above a KVM, and this makes accessing the ...
- 243
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0
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52
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MPLS labels for BGP prefixes
I've just started studying about MPLS and the labels it uses and this was mentioned in my study resource.
When we use LDP on Cisco IOS, we locally generate a label for each prefix that we can find in ...
- 783
1
vote
1
answer
105
views
Why are 10.3(99w)F and 10.3(99x)F NX-OS named like that?
According to https://www.cisco.com/c/en/us/products/collateral/ios-nx-os-software/nx-os-software/guide_c07-658595.html#TypesofCiscoNXOSSoftwarereleases the part in brackets - "99w" and "...
- 113
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50
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Recover Aironet AP-ESC doesn’t seem to break c2602 boot sequence
I am trying to reuse an old Cisco Aironet c2602 Autonomous AP; I need to reset the password. CCO instructions say that I need to hit ESC repeatedly while I am on the console during the AP boot ...
- 29.9k
1
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2
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99
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Inter-VLAN using L3 switch
There are 3 VLANs 10, 20 and 30 on these switchs. Everything such as VTP, DTP are working fine. The problem is that inter-VLAN seems not to work correctly. IP routing is activated on the L3SW (even ...
- 27
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1
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51
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Non VLAN Tagged Traffic Not Going Through Trunk Between Cisco Switches
Good day all.
I am running through a packet tracer exercise and am stuck on where to go next. Forgive me if I am missing something obvious, I have not touched any cisco networking or networking in ...
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1
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40
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What is the recommended destination public IP for Cisco IP-SLA?
I want to implement Cisco IP-SLA, but I am not sure what the destination IP I should use. Any recommendations or advice?
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13
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Cisco WDS, FreeRadius and LEAP
Freeradius got rid of LEAP since some pointrelease of 3.2.x, and I'm stuck configuring Cisco WDS on their Aironet series.
Since forever there was a tweak with LEAP in Cisco configuration like this:
...
- 243
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0
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24
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Unable to connect to the router using ncclient on RedHat 9.0 on IBM PowerPC
I have a simple program using netconf client version ncclient 0.6.13 with Python3 running on PPC64LE Red hat Version Red Hat Enterprise Linux release 9.2 (Plow)
which is using netconf yang to connect ...
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1
answer
35
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IPv6 subnetting with different end device requirements
`I have three main buildings with building A with 242 end devices, building B with 54 end devices and building C with 894 device. And all the routers are connected to each other like ring topology. ...
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338
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CISCO 9800-L Controller internal dhcp not working - GUEST WIFI
I have been trying to configure a guest network for my Cisco Catalyst 9800-L Wireless Controller for some days now. For the guest network, i want it to use an internal dhcp on the controller. I have ...
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1
answer
62
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Cisco CP-7841 IP Phone backlight settings not working [closed]
I have a couple of Cisco CP-7841 IP Phones that are working otherwise well, but the backlight controls are not working. I would like to have the backlight off unless the phone is being used (IIRC this ...
- 11
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1
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81
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The Use of BGP Communities
I am studying BGP communities at the moment.
I understand that communities are path attributes which are a way of tagging specific BGP route advertisements in order to ensure proper route selection ...
- 783
1
vote
1
answer
35
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RIP v2 Network Command
I am comparing the Boson ExSim Lab to the Neil Anderson's Lab on RIP.
On one of the labs on Boson ExSim, it asks to configure RIP on the routers, all of which are on some form of a 192.168..0.0/24 ...
- 11
0
votes
1
answer
65
views
Cisco Certificate CA Server and SCEP - adding RADIUS authentication
I am running a CA server on a Cisco ASR1k Router for several years. until now the number of SCEP clients is quite small (below 10) that it is possible to restrict SCEP Downloads by implementing a ACL.
...
- 527
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votes
2
answers
28
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RMA'ed device configuration [closed]
Just wondering what are the methods that you use when re-configuring an RMA'ed device.
Do you manually configured all the script that runs on the device or is there any efficient ways configuring the ...
- 35
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2
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163
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What Does Exactly Happen When A Switch Is Connected To A Portfast Port?
I am trying to get a thorough understanding of what does happen when a switch is connected to a portfast port on another switch that is part of a stable STP network in case of:
1- the port has no ...
- 285
3
votes
2
answers
176
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OSPF Advertise only loopback not transit VLAN
I have this topology:
and this configuration:
R1
interface Loopback0
ip address 10.0.0.1 255.255.255.255
ip ospf 1 area 0
interface GigabitEthernet0/0
ip address 192.168.0.1 255.255.255.252
ip ...
- 399
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votes
1
answer
46
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logging host 1.1.1.1 on Cisco C9300
My Catalyst C9300s running IOS-XE have logging host 1.1.1.1 in the config by default. Is that because it is sending logs to it's internal logs store? I can't seem to find a straight answer in the ...
- 461
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0
answers
95
views
Why Fast Ethernet port in Cisco Packet Service is always down?
I built a simple network simulation with Cisco Packe Tracer. I am not able to understand why fast ethernet port Fa0/0 on server Gmail and correspondent port on Router2 are always down. I checked and ...
0
votes
1
answer
317
views
Cisco Nexus vPC Portchannel issues
I'm currently facing a network issue between Cisco Nexus 93108 (9.3.11) on an LACP port-channel configuration.
The replica below help us to reproduce the issue we had (using 4x Nexus 9000v qcow2 image ...
- 101
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votes
1
answer
61
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How to configure IDr on Cisco ASA for AWS IPsec tunnels
I am currently facing an issue while attempting to establish IPsec tunnels between AWS and a Cisco ASA firewall. The AWS tunnel logs indicate that the Identity Resolution checks are failing, ...
0
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1
answer
734
views
Cisco NX-OS Factory Reset
An easy question actually. How do I do a Factory Reset on NX-OS? That means, how do I completely and permanently wipe all the configuration I've made without deleting the operating system image? There ...
- 1
0
votes
2
answers
93
views
Can we have two logging source-interface configured on Cisco Switch?
I would like to understand if its possible for us to have two logging source-interface configured on Cisco Switch:
logging source-interface vlan1 (For syslogs)
logging source-interface vlan2 (For ...
- 57
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1
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341
views
Cisco interface vlan (shutdown vs no ip address)
What is the difference in functionality between these two commands.
interface Vlan10
shutdown
interface Vlan10
no ip address
I haven't been able to find any source material, but I've seen other ...
- 113
0
votes
0
answers
23
views
Gain using single antenna on Aironet 4x4 MIMO device
I'd like to configure a CAP-3602E in order to use with a single element grid antenna.
I assume that when I'm in full 4x4 MIMO mode (all antenna ports enabled), if I have Tx power set at 23dBm, each ...
- 103