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.
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Switch 3550 password default password
What is the Cisco 3550 default password?
I lose the password due some power outage while I was programming.
I did reboot, and try the recovery password but doesnt work.
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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?
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SNMP: Configuring/Enabling SNMPv3 on Cisco IOS and SNMP Agent
I have been configuring and using SNMP v2c on Cisco routers.
Due to the obvious advantages in SNMP v3, I am planning on enabling SNMP v3 on SNMP v3 supported devices.
Could someone let me know:
The ...
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Why do 802.1Q trunk ports drop tagged frames with the same ID as the native VLAN?
I'm taking a course on the CCNA and when learning about VLAN tagging, I came across this:
"If an 802.1Q trunk port receives a tagged frame with the VLAN ID that is the same as the native VLAN, it ...
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How to NAT a unicast address to a broadcast address?
I have a 800-Series router connected in the following configuration:
Port GigabitEthernet7 is connected to an external server (192.0.2.251) that sends unicast UDP to destinations 192.0.2.42:45100 and ...
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Cisco 2960-X IOS Version 15.2 can't use command access-session control-direction both
I am trying to configure a Cisco Switch 2960-X with IOS V15.2 for WOL ( Wake on Lan)
I tried this tutorials but the command isnt working:
https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/san/command/...
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Hide FTP login details from the running config
We are using the below commands to save configs onto an FTP server, I am wondering if we can hide the login details as they show in clear text in the running config.
#show run | b archive
archive
...
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Warning: portfast should only be enabled on ports connected to a single host
I've got this error and feeling frustrated about it , So we have in Production areas machine that's needs to assign to vlan 213 and after i did the configuration for that port and got an error with ...
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Switch0 is configured as DHCP server but not working?
Here I am not able to obtain ip automatically using DHCP.
Here is configuration of swtich0 which is having DHCP Server.
Switch#sh run
Building configuration...
Current configuration : 1237 bytes
!
...
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What does `action errdisable` do differently when issuing `power inline police`?
While learning for my CCNA exam, I was looking over Cisco's PoE guide. It explains how to configure PoE so that a port changes its behavior when a device draws too much power:
power inline police: ...
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How do you drop (or ignore or filter) all untagged traffic on an 802.1q trunk port?
This answer says "[a] trunk has optionally one untagged VLAN and many tagged VLANS."
I always thought specifying switchport mode trunk would drop untagged frames at that port, but that ...
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Is it risky to change hardcoded STP mLAG port cost on Cisco Nexus LACP port
When two Cisco Nexus are connected in VPC, the stp cost is hardcoded to 200 for the mLAG LACP ports.
I would like to manually change the cost on my devices because my 2G and 200G links have the same ...
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ASA IPS issue: routing and management interface
We have management network (192.168.25.0/24) where we have management ip of ASA 5525-X IPS Bundle (.250) and IPS (.37). The IPS has a default gateway of our Layer 3 (.1) switch that is behind the ASA (...
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Cisco router access list not working as expected
I'm trying to set up a network in packet tracer with inter-VLAN routing. I need to restrict one of the VLANs to only accept traffic from the 172.25.30.0/24 network.
To do this I am using an access ...
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What does `switchport trunk native <n>` do when in `switchport mode trunk`?
According to this article Cisco recommends VLAN 99 for the "native VLAN".
But what is the point when operating under switchport mode trunk?
Doesn't switchport mode trunk filter all tagged ...
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Enable SNMP traps for ACLs using Cisco IOS?
Does anyone know if it's possible to enable SNMP traps to be sent from a Cisco IOS device when an ACL blocks traffic? I'd like to send a trap whenever a deny statement gets a hit.
I've only been ...
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Network Tapping cat3750/3850
I work with tapagg solutions as an NDR engineer. Upgrading my lab for various reasons. Right now I SPAN with an old cat2960 into my packet system. I need to bump up to gig span and would like some 10G ...
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How to generate cisco key-hash string
cisco IOS stores public keys used for authentication as hashes.
cisco obviously does not store the key itself because you can simply copy these key-hash lines between machines and you can authenticate ...
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Why I’m getting overlaps with fast Ethernet 0/1 when assigning an ip
But I have been receiving error code when I want to assist an ip to s1/0
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aggregating Cisco 2960 ports with Cisco 3850
I'm new to networking. I have two switches: Cisco 2960 & Cisco 3850. I want to connect 4 Trunk ports of these switches to each other. Since Cisco 2960 port speed is 1G and Cisco 3850 is 10G, I ...
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I got locked out of my switch
I am currently practicing on cisco packet tracer, so I used the command " enable password 5 cisco"
then I leave the global configuration mode to the user mode and try to go to privilege mode ...
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Script Or API way in Cisco ACI to check interface flap statistics
Would you have an option to check all the interfaces that is flapping my fabric ? Please help , i'm 1 Month new to this . Thanks.
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How to view or change OSPF LSA max-age time in Cisco IOS?
Is there any way of viewing or changing OSPF LSA Max-Age time in Cisco IOS?
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spanning-tree portfast
IF I remove vlan 922 do I still need to have spanning-tree portfast when I will assign this port to UPS? I just need a port setup without voice VLAN and in layer two network
interface GigabitEthernet2/...
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ISR 4331 vs ISR 4331/K9?
We have cisco router. On its box/package ISR 4331/K9 is written. I am watching a youtube video at below link, its title has word ISR 4331
https://www.youtube.com/watch?v=bk-4jkb6Cwo&list=...
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why SR LSP no tunnel interface? but SR TE need it?
I'm a bit confused that why SR LSP(or LDP LSP) no need to config a tunnel interface, but SR TE(or MPLS TE) need it.
how the tunnel interface works?
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Cisco anyconnect VPN router specific public IP via tunnel
I have fully functional cisco Anyconnect VPN running on Cisco ASA5585-X and today i got requirement that there are some remote public sites we need to whitelist our VPN public IP to access them over ...
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Cisco Switch login
I have a switch as connected to the stack. I got it off the internet so now I need to login to this switch. I connected it to my laptop by the console cable and it did not let me to login with my ...
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Port suspended (No LACP PDUs) nx 9k switch -> C220 m5 ucs
We are setting up 2 nx 9k switches with port channel (LACP) enabled so we can have multiple links for redundancy. The two links in questions is eth1/3 on both switches going to UCS MLOM ports.
We are ...
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Difficulties retrieving attached device MAC addresses from switches/switchports
We have hundreds of mostly Cisco switches and I'm trying to track down all the MAC addresses (latest would be good enough) seen by all the switchports. Following the suggestion given here, I've been ...
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Full Cone NAT on Cisco router in Packet Tracer
I am trying to create a network with two subnetworks with private IPs. I need to configure symmetric NAT on edge routers within the subnetwork.
Diagram:
I need to configure NAT on Router0 and Router2....
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How to simulate Mac flooding attack in Cisco Packet Tracer?
I'm trying to see effectiveness of port security on Cisco switches using simulations in Packet Tracer.but first I need to run some Mac flooding address attacks on switches in Packet Tracer. Can anyone ...
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limit bandwidth on a Cisco switch port,
Our company has a 3/.5 DSL connection. On this connection we have a VPN where the execs are able to access files on the network as well as VOIP. On this connection we also have our exchange email ...
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Cisco switch police bandwidth for IPv4 and IPv6 traffic
I am trying to limit the bandwidth of several VLANs on Catalyst 3750X (c3750e-universalk9-mz.152-4.E10.bin) and Nexus 3064PQ (n3000-compact.9.3.9.bin) switches without success...
It is necessary to ...
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How to enable ip address for all ports in the Cisco IOS Web Browser
Good afternoon, how do i enable the ip address in webui for the cisco switch you can see the picture below ipv4 is unassigned, everything looks good with me.
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Understanding Cisco standard access lists (Packet Tracer example)
Consider the following example: I have two networks (192.168.1.0 and 192.168.2.0) with one PC in each network (PC0 - 192.168.1.1 and PC1 - 192.168.2.1) and a router R0 with 2 interfaces connecting ...
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DOT1X: A practical case for ForceUnauthorized state
I have been working as a Network Engineer for almost 5 years now. I have never encountered a scenario where I would need to configure a Cisco switch port as ForceUnauthorized (DOT1X).
According to the ...
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OSPF routes are not advertised
routers with ASBR2 connecting to AREA 0 and 10 and ASBR1 connecting to area 0 and 20, there's no entry of routes in R1's routing table, help me out
R1#sh run
Building configuration...
Current ...
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GNS3 - hosted or VM?
I know that there is a gns3 client that is installed in the operating system.
but i see there is a gns3 for vm
that gns3 for VM In a few words it is a virtual software to use it with a hypervisor
It's ...
- 82.6k
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RIP routes are not being advertised
I have 2 routers(R3 and R4 connected with serial links). I have advertised my loopbacks with RIP ver 2. with 192.168.1.1/32 and 192.168.2.1/32 on R3 and 192.168.3.1/32 and 192.168.4.1/32 on R4.
My ...
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Cisco Packet Trace Access-List
i have make a network,
an i have try to work with access-list but not working :(
can anyone help me with this pls
Pc1 can access server finance
server web can be access from all pc
and server ...
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I need help with Meraki AP configuration
Hello everyone i have this port gi2/0/41 was configured for work station and port gi1/0/18 is configured for Meraki Ap , i need to correct the configuration in port gi2/0/41 and make is as the same ...
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Cisco ASR1006 QoS on pppoe session: Police percent not supported - no bandwidth for percent calculation
I want to perform QoS on specific (or all the) L2TP sessions that establish on ASR1006 router (LNS).
What I have managed already is to set a police at a specific rate for a class that matches access-...
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3
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How does a router decide what route to forward a packet when routes come from different routing protocols?
I'm a little confused. I know how the best route makes it to the routing table, but what process does the router follow to choose a path to forward a packet if, for example, you have something like ...
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VLAN and firewall interconnection
I'm encountering some difficulties to connect some VLANs to a physical firewall.
In details I have a core network with a L3 switch as a router and some L2 switches as access network. The network is ...
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Stackpower - hot pluggable?
I need to add a C3850 switch to an existing switch stack.
I know I can unplug a stackwise cable from the stack without problems, but is it the same with stackpower cables ?
All switches have at least ...
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How do I bridge a Cisco 860VAE-W from VDSL to Ethernet?
I've got a Cisco 860VAE-W which I'm trying to bridge. I picked it up because I was interested in learning a bit about an IOS device – I'm coming at this pretty raw.
>show inventory
NAME: "C867VAE-...
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What is the ssd LUKS file on the (boot)flash of newer 9k Catalyst switches?
On a couple of our recent Catalyst 9k switches running IOSXE 17.3.x we've noticed a file with the name 'ssd' on the (boot)flash: filesystem.
switch#dir flash:
Directory of flash:/
270353 -rw- ...
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How to configure a layer-3 switch for routing between VLANs?
I have set up the router as a dhcp server and I would like to use the layer 3 switch to route each PC in seperate vlans. How do I configure the router and L3 switch for inter vlan routing ?
the router ...
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Connecting 9 Remote Sites with VPN Tunnels
I am working in a Cisco ecosystem and need to be able to test a 9 tunnel IPSec network over the internet using 10 x Cisco 1941 routers. This is a "hub and spoke" type configuration; where ...
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