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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Differentiate two devices with same IP using siwtches [closed]

I have system like above. From Client-2, I need to send different packets to VM1-Server and VM3-Server using TCP. The problem is that both Servers have the same IP and I can't change them. It is ...
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1 answer
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Does network switch have a separate wan port? [closed]

Does a switch has separate wan port with higher speed than others to carry data of the all combined devices? for eg. a 100mbps switch 24ports should have a 2400mbps port to give all ports 100mbps In ...
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1 answer
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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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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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1 answer
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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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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 ...
1 vote
2 answers
47 views

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/...
1 vote
1 answer
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If one of hub is damaged,will it cause others hub damage too?why can't i enable the rapid dual homing

There is a multi-ring topology, combined with 8 Hubs and 2 switches, i want to ask two questions 1. If H3 is damaged,but the fiber is still ok, will H2 damage too in the future? i have thinking to ...
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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 ...
1 vote
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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1 answer
331 views

Duplicated Vlan ID

I have one flat network with our data center and it is causing as a lot of issues, so i had to design a new network to separate the buildings from the data center, when I designed the new network i ...
2 votes
2 answers
595 views

Cisco 2960 not receiving dhcp from the router

I have a problem with Dhcp of some the Vlans. here is how my network is : I have a router ASR1001, which connects 15 switches(2960) as a ring topology. each switch has a subinterface of the router ...
1 vote
1 answer
93 views

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 ...
1 vote
2 answers
143 views

Colocation Rack Networking

I'm a sysadmin tasked with finding a managed service provider or networking contractor to build out our new colo space networking. I'm hoping to get some input to make sure I don't sound like an idiot ...
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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 ...
1 vote
2 answers
80 views

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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5 answers
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What are the reasons for not putting multiple subnets on the same VLAN?

I would like to know why we do not (and should not I guess) use 2 different networks on the same LAN/vLAN. From what I tried and understood : Host in network A (ex: 10.1.1.0/24) can talk to each ...
1 vote
2 answers
135 views

100 Mbps vs 1 Gbps in a network

I have a network with an older HP 1400-24G un-managed switch. A while back I noticed that backup for a SQL server database took 15 minutes. Using the performance monitor I found the Ethernet ...
1 vote
2 answers
78 views

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 ...
0 votes
1 answer
1k views

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 ...
1 vote
1 answer
44 views

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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1 answer
21 views

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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1 answer
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Can anyone explain the introduction of Rapid Dual Homing to me?what is the main function of rapid dual homing?

I read some information about Rapid Dual Homing from JetNet 5020G,the figure below is the introduction of Rapid Dual Homing. Honestly,i don't understand why can the rapid dual homing have multiple ...
4 votes
1 answer
1k views

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 ...
3 votes
1 answer
181 views

iSCSI with dedicated switches

Looking to purchase some dedicated 10GB switches for our iSCSI setup. Would the following setup allow us to use two switches for redundancy? Two VMWare ESXi hosts, each with 2 10GB NIC Storage with 2 ...
0 votes
0 answers
37 views

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 ...
1 vote
4 answers
167 views

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 ...
1 vote
3 answers
76 views

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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1 answer
39 views

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 ...
1 vote
2 answers
9k views

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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1 answer
105 views

Korenix Switch JetNet 4508v2 SSH Problem

Does anybody know, or has anybody worked with Korenix JetNet 4508v2? This Switch has a very important Bug in the Firmware. SSH is working fine, but for a period of time. Then, ssh is not working ...
1 vote
1 answer
25 views

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: ...
1 vote
0 answers
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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 ...
0 votes
1 answer
51 views

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 ...
2 votes
1 answer
844 views

How do I split static IPs from an ISP for separate usage?

I have a lot of IT experience/consulting, but want to test what I have done against some of the real experts hre in the networking field so I can keep learning and do what's best. I have ISPs with 5 ...
0 votes
1 answer
26 views

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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1 answer
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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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1 answer
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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 ...
1 vote
1 answer
202 views

How to block telnet access for one particular network from all networks except one using Extended ACL

Scenerio is given in the picture. I want to block all the networks except 192.168.5.128/25 from doing telnet of 192.168.5.0/25.
0 votes
1 answer
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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 ...
8 votes
6 answers
2k views

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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1 answer
35 views

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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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 ...
0 votes
1 answer
38 views

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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1 answer
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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
1 answer
334 views

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 ...
3 votes
1 answer
107 views

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 ...
0 votes
1 answer
166 views

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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1 answer
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J9450A HP 1810-24G Switch firmware upgrade

I'm trying to upgrade the firmware on my J9450A HP 1810-24G Switch, which presently has firmware P.1.6, eCos-2.0 The firmware-update-for-an-1810 question is out there on the internet, but the ...
1 vote
1 answer
329 views

HP ProCurve Switch 4100 series - Checking PSU status & S/N from the CLI

Do you know if there is any CLI command available on the very old HPE Procurve 4108gl/J4865A switches where you can see how many PSUs are installed in the chassis, what's their current status and ...

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