Questions tagged [switch]

For questions about network switches, the term commonly refers to a multi-port network bridge that processes and routes data at the data link layer (layer 2) of the OSI model.

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How to set up a MoCa adapter on a home network with Bell internet? [closed]

I have a new house and I want to set up a MoCa adapter for fast internet but need some guidance. Some facts about the house that I noticed. There are 4 coaxial ports around the house. 1 in basement, ...
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Why devices connected through Wi-Fi and Ethernet cannot reach each other? [closed]

I am having connectivity problems in my homelab network, some hosts are unable to reach others even though all are in the same subnetwork (192.168.1.0/32). The topology of the network is as in the ...
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How can i add this Virtual machine to vlan? i need hep with configuration please [closed]

This is the first time I got a ticket that needs me to add this (RTIWS19MAGLELM000) Virtual machine into VLAN 119, I really need help with this and the steps how to do it, I attached the information ...
3 votes
2 answers
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Show port on Cisco switch that mac address is being dropped on

We use ISE to handle port security on our switches. When I see that there is a mac address being dropped by the switch it doesnt show what interface this mac is patched into. #show mac address-table (#...
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Can a switch fragment a jumbo frame?

In all resources seen that tackle the term of "jumbo frame", I understand that it is applied in a LAN, because: It's a Jumbo frame, and a frame is for Layer 2 These resources talk a lot ...
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Adding switch to domain, do I need to use vlan

I have a windows 2016 server. I am setting up a domain on it (office.local), and user accounts through Active Directory. Do I need a managed switch and vlan to allow PCs to connect to the server, or ...
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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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2 answers
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What is considered a LAN segment in this STP explanation?

Like others, I'm trying to wrap my head around the difference between root ports (I under stand this one) and designated ports (I do not yet understand this one). Wendell Odom's CCNA book mentions the ...
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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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3 answers
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Can you send data in LAN without an IP?

From What I know, IPs are used to communicate b/w two different networks say LAN1 and LAN2... and MACs are used to communicate within a LAN.. I think this because my instructor says that Hubs and ...
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1 answer
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Slow internet throughput if servers are connected on 10G. But good when on 1G?

In our datacenter I'm having throughput issues if a server is connected on a 10G port on the switch. For debugging I already removed our router and asked our ISP for a small IP range that I can use ...
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What is the function of Switch Processor (symbol)?

I see this symbol very often on topologies, what does it mean and why needs an IP apart from the switch itself?
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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 ...
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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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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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1 answer
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HPE 2910al Switch - Schedule a job

According to the documentation found at the below URL there is a function on the 2910al to run a scheduled job, called "Job Scheduler" https://techhub.hpe.com/eginfolib/networking/docs/...
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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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Noob: i design a network for 156 computers/4 printers, need help in few things

Sorry if this stupid questions: I just learn networking like a week. Lets say company xyz have 39 computers and 1 printer in each floor, there are 4 floors, total amount of computers is 156computers ...
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HPE Office Connect 1820 - direct URL to pull/download config file?

We inherited around 90 HPE 24 port switches of this model: HPE OfficeConnect Switch 1820 24G PoE+ (185W) J9983A, PT.02.06, Linux 3.6.5, U-Boot 2012.10-00119 (Aug 31 2018 - 10:12:27) And we're ...
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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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Capture switched traffic on fortigate

I have a fortigate 40F with an lan1 to lan4 configured as an hardware switch (lan). I would like to capture switched traffic between hosts, even if it's not in the same IP subnet than the lan ...
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1 vote
4 answers
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Can a router provide DHCP to multiple subnets that are connected via switches?

I'm trying to understand if it is possible to have a router (as shown in the below diagram) provide DHCP leases to more than one subnet if the subnets are not directly attached. If both the printers ...
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1 answer
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Multiple switch groups on a Dell Powerconnect 5448 Switch

I am new to managed switches. I have a Dell 5448 48-port switch. I would like to configure it as six separate groups of unmanaged 8-port switches. Each group of 8-ports would share all traffic within ...
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Spanning tree loop prevention

Can I get some advice on what STP features to enable as best practice please, mainly to mitigate loops? In the past a user mistakenly connected two floor ports together causing a loop. Below are the ...
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Deprecation of 10Mbit links and workarounds

We are looking at deploying some low power embedded nodes as part of a sensor trial, these devices use a fairly dated Ethernet chip that only supports 10 Mbit speed. Is it true that (some) newer ...
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What is an Ethernet Network Switch Port

I am trying to understand what an Ethernet Switch internally considers a single port. My current understanding is that when a seller advertises an Ethernet Network Switch, like the one below, has five ...
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I upgraded a Cisco switch to a newer model with different SNMP OIDs. Can I have the new switch receive the old OID and report values from the new OID?

I upgraded from a Cisco SG300-10MP to a Cisco SG350-10MP. A piece of software is looking for the value from 1.3.6.1.2.2.1.8.50, but the OID on the new switch is 1.3.6.1.2.2.1.8.2. The final number ...
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Configuring shared uplink on l3 dell s4128f-on

I have a Dell switch s4128f-on which I'm using as L3 core switch. What I want to achieve is creating multiple vlans and being able to reach other networks through an uplink. What I've done so far is: ...
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Port mirroring traffic on Hyper-V not showing Layer 3-7 traffic [closed]

We've been experiencing some issues with port mirroring that is used by a Network Intrusion detection system. Our company uses AlienVault as a SIEM and uses a Hyper-V sensor which is used to forward ...
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QOS - CPU CoS Weight- pluribus switches

I have different switches and each switch has different cos-weight. Now, it has cos3-weight, cos4-weight and cos5-weight in one switch as 15. In other it is 30. As per this link : https://...
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Ethernet Basics - Switch Fabric, Managed Ethernet Switch & Virtual PHY terminology

I'm a new member to this community. I've just started to learn and practice on working with LAN Ethernet PHYs, Switches and other ICs related to Ethernet. However, I've a few questions where I couldn'...
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Will this switch do what I require?

I'm a complete network newbie, so please forgive any egregious errors. I'm a Master's student who wishes to perform benchmarks on distributed databases. Firstly, I wish to set up configurations ...
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Show LLDP neighbors history

Is that possible to view the logs or history of a lldp neighbors, I just want to review a switch if the switch once connected to another switch.
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How Does A Layer 2 Switch Differentiate Between Different Networks?

I know that different IP-based networks can be connected to the same layer-2 switch. and I know each network's nodes can communicate just fine, however, no normal traffic can occur between two nodes ...
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Switch stack with only one

i've two dell switch 1148N When i set one port for stacking, it automatically set two port: ex. Te1/0/3....it set also Te1/0/4 Is it possible to create a stack between 2 switches using only one port ...
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Switch with 100Mbit and 1Gbit ports - using its full capacity

There are switches with mixed-speed ports, usually 24x100Mbit + 2xGbit, looking something like this: . How are these different-speed switches internally connected? The point is, can you use multiple ...
1 vote
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MAC address table and frame forwarding on Layer 2 switches - question about when two computers are connected via hub to same switch port

My apologies if this is not the right forum to ask this, but I am a newbie when it comes to networking. I am currently going through the CISCO Networking Essentials course, and one of the Activities ...
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How FDB (Filtering Database) is filled out

I would like to understand what is used as a VLAN column in the FDB. For ACCESS port it is PVID if frame untagged or frame VID if frame is tagged, for TRUNK it is allowed VLANs? We can represent the ...
3 votes
1 answer
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VLAN Ingress filtering process on switch

I read and read the information and somehow it is inconsistent or incomplete. The specification of 802.1Q also read, but to me as a person who has not previously read the specification is difficult. I ...
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how to show updown log event on aruba switch port

I'm trying to check the event logs on a port that keeps flapping on aruba switch. is there a similar cli command like from cisco switch im using show log | i UPDOWN.
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Managed Switch, Setting up VLAN Tagged, Untagged, allowed & tagged only etc

Looking for some help setting up a Dell PowerConnect 2724. 1st time setting one of these up. The best graphic I could find to explain my setup: My router DHCP is enabled so it will provide IP ...
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1 answer
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ws-c3750x-48pf-s v02 not booting after password reset procedure

I tried to do a Password Reset Procedure on ws-c3750x-48pf-s v02 - 48-Port PoE, but at the end of the procedure the switch no longer works after multiple restarts and pressing the mode key, I always ...
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Changing boot variables

I'm new to networking/cisco gear and need some guidance. I'm gearing up to upgrade the code on a 3650 from 03.06.04E to 16.12.05b. I've done this once successfully but ran into a switch with a ...
2 votes
1 answer
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Display interface - wrong parameter

I couldn't check the HP interface status. i've run display interface and it shows wrong parameter. See below. XGE2/0/14 UP 1G(a) F(a) T <SW1>display interface GE2/0/14 ...
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3 answers
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what is switch device mac address?

I'm studying STP protocol and how to configure STP on switches. I know each switch has several ports and each port has one MAC address. but when I read the below article I noticed that it allocate one ...
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How to reset a Default username and password of Allied Telesis AT9000/28 switch using CLI? [duplicate]

How to reset a Default username and password of Allied Telesis AT9000/28 switch using CLI?
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How do I check if a Cisco switch is connected to a SYSLOG server?

We use the Cisco C2960X switch. Query 1: What does console, monitor, buffer & exception logging mean? Query 2: Capture logging to 192.168.X.X which means if the switch sends logs to the SYSLOG ...
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Why is a switch port a collision domain?

I'm just starting my IT education and this is probably a very basic question but I'm having trouble with it. As far as I understand a collision domain is a part of a network where collisions can occur....
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Is there an equivalent of the Cisco/ Cisco esque command "ip helper-address a.b.c.d" on Mellanox switches?

Apologies for my newbie question. I have recently had a Mellanox switch added to the mix. I was using an "IP helper-address" to forward DHCP requests in different VLANs to my DHCP server(s) ...
2 votes
3 answers
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What is the behavior of two managed switches connected to one unmanaged switch?

Image the followign scenario Switch 1 Managed (root) Switch 2 Managed Switch 3 Unmanaged They are connected as follows: Switch 1 <-> Switch 3 Switch 2 <-> Switch 3 Switch 1 <-> ...
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