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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Network Switch automatically sets my pc to 100MF, limiting bandwidth [closed]

I have a network switch between my ISP's Modem and my Windows pc and Linux server. The switch is a tp-link TL-SG105E. My internet speed is around ~100Mbps down and ~8Mbps up. So, for some reason my ...
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network Automation using Python [closed]

I tried to create VLAN using the following python script. I already configured "192.168.8.105" as the IP address and I can telnet log to this switch using putty. But I faced an error when I ...
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1answer
40 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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Switch networking question from a novice user alright [closed]

Alright, might be a totally simple answer that I'm obviously not intune with but i have a question about unmanaged gigbit switches. Will i be able to plug in A switch in different room from my gateway ...
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Error: unknown connection [closed]

I am trying to add a secondary IP to an active network enps0 but when I sudo nmcli con mod enp9s0 +ipv4.address "184.67.98.42/24" I get Error: unknown connection 'enp9s0'. I am on CentOS7 ...
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18 views

Is this how Openstack Networking works? [closed]

So, I am trying to wrap my mind around Neutron from a broad way. Here is what I understand: I ask an ISP to reserve say 30/40 public IP addresses to me. Directed to the router assigned to me through ...
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1answer
41 views

How to determine if a network cable is bad on a LAN under an unmanaged switch with no DHCP?

Is there anyway to detect this via automation and software? I know if I can get access to the MAC address table on the switch I can see if there's a missing MAC address. I don't know if this is ...
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2answers
66 views

Switch with VLAN: How to map between VLANs networks

Assume the following network layout +--------+ ----------------------------------------| Switch |----------------- | ------------------------+-----...
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1answer
36 views

Does a router that only has one connection to a switch with four connection have three interfaces in total?

Let us say that we have a router in a network. This router is in turn connected to only one network switch. Does it mean that this router has one interface or not only one but also the connections ...
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19 views

What is preamble in ethernet frame and why is it used? [duplicate]

I've searched all over the internet and every say that it synchronize the receiver clocks. What does that mean? Also I've seen another definition that preamble gives NIC time to realize a frame is ...
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1answer
30 views

How Switch knows if the packet reached it's destination?

In a Lan connected using switch, For the first time if the sender sends a data to the destination, then the switch will send the data to all the devices in the network, and the devices will have to ...
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1answer
45 views

How do switches handle network data if the destination computer is powered off in half-way?

Consider a lan network with a switch. Assume the switch has the mac addresses of all the devices in it's newtork. If the source computer sends the data to the destination computer through a switch, ...
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1answer
56 views

STP Loop issue on long distance link

I have long distance connectivity between west coast to east cost datacenter via our ISP network as you can see that in following diagram (BSN=Boston, PHX=Phoenix) Now when ISP-A or ISP-B doing any ...
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2answers
95 views

Message switching vs packet switching with respect to congestion traffic

Packet switching uses store and forward technique to forward packet. And message switching is also uses store and forward technique to forward message. But in packet switching data transfer faces ...
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23 views

Update IOS on Cisco CGS2520 Switch

I need to update the IOS on a Cisco CGS2520 Switch. Not stacked, single switch I have never done this before and I have a couple questions. I do not have physical access to the switch. Looking at the ...
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25 views

How do I load VLAN database between switches (CISCO 2960)?

I glad for any help on this topic -- netanel
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Why do we need Layer 3 logic to communicate to other networks? [duplicate]

My knowledge about networking is a bit rusty and as I am watching and learning about networking, TCP/IP and potentially get a CCNA/CCNP certification a thought crossed my mind: I keep seeing (simple, ...
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1answer
28 views

Unable to delete zones in the effective configuration

I was given the task of zoning and mistakenly I created new cfg and did zoning of a host. Now I am trying to delete zoning using below steps: Zonedelete Cfgsave cfgenable Cfgremove Cfgsave cfgenable ...
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1answer
39 views

How to manage firmware

Switches and routers have some firmware (similar to BIOS (UEFI) on PC). It represents a "step" before the OS (maybe I'm wrong). Can we manage this firmware just like BIOS or UEFI on a PC? On ...
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2answers
36 views

Brocade SX800 Management Problem

In my company we have a brocade sx800 backbone SW, it is not used for 4 years. Now we need it for new warehouse project.But we don't know what was the ip addresses and no info about this device. When ...
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1answer
31 views

Fabric Extender for Peer-Link on vPC domain (two Nexus 5000 switches)

I have two Nexus 5000 series switches. My question lies with the Peer Link. My intentions are to use e1/31 and e1/32 on both switches as the peer link. Here are the exact SFPs that I am using for ...
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1answer
47 views

Does router handles directed broadcast on same network?

I have started reading on Computer Networks recently(beginner), and have come across some of the doubts regarding how the broadcasting is handled by routers and switches. Assuming there are no ...
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1answer
69 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 ...
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1answer
24 views

Does privilege level work in Packet Tracer's Switch-PT?

On Switch-PT in Packet Tracer, I'm trying to set a user with username b and secret b, with privilege level 5: username b privilege 5 secret b line console 0 login local ​ But when I do show running-...
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1answer
54 views

Struggling with interVLAN routing + multiple VPNs + default routes on multi-layer switch

I have a fairly simply setup, using a PCEngines firewall running OPNSense and an EdgeCore ECS4620-28P L3 switch. The EdgeCore is doing InterVLAN routing and that works just fine, but I cannot get ...
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4answers
221 views

How to add two VLANs for DHCP Pool

Currently one of my customer has DHCP pool created in Cisco Switch and ip address range is 192.168.25.0/24 (This is a VLAN). Now they have 230 devices and They are going to increase device count by ...
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1answer
52 views

Need help with HPE tagging and hybrid-mode port

At my office I have two switches. SW-1 (HP-V1910-48G) is the switch my desktops are connected to, and SW-2 (HPE-1920 JG927A) is where my server rack with my dhcp and default gateway is connected. ...
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25 views

h3c switch - get which trunk group that a port belongs to via SNMP

Switch: HP FF 12900 with JG857A, JG626A and JG623A modules I want to get which trunk group a port is belongs to via SNMP on my h3c core switch. Which MIB and OID can I use to get that data via SNMP? A ...
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39 views

Can ping from VPC 1 to router and VPC2, but can't ping from switch to VPC2 or router

I have a simple, linear topology in GNS3 that goes like this. VPC1 > Switch > Router > VPC2 I have the default static IP Routes on the router set to 0.0.0.0 0.0.0.0 Ethernet0/1 and Ethernet1/...
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2answers
63 views

Switch vs WAN switch

Is there any difference between the normal switch and the WAN Switch? because i read that the WAN switch operate at layer 2 of the OSI model, so what makes it different from the normal switch? is it ...
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1answer
52 views

Using a single device as both a media converter and switch

So I have an Aruba 2530 switch with a couple of SFP slots, an incoming fiber connection and a modem that only has RJ45. There's limited space and I want to use as little boxes as possible. Is there ...
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3answers
102 views

No internet access on VLAN

I'm trying to setup VLAN on my TL-SG3210 (3.0). I created simple VLAN: vlan 10 name "vlan10" Then, I assigned port 2 & 3 to VLAN. I also created interface: interface vlan 10 ip ...
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2answers
33 views

Configure router to forward packets between two switches

I have two sub nets on Cisco packet tracer, the central node(switch) that networks all nodes in sub net A is connected to a router which connects to switch B which is the central node for sub net B. ...
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1answer
30 views

ping shows different outputs

Both VLANS are working, and pings from R1 to R0 and vice versa also work successfully. But when I ping from the pink PCs to the blue PCs I get destination unreachable, and when I send pings from the ...
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Can two hosts with different subnets connected with a switch talk if they know each other's MAC address? [duplicate]

EDIT: There is a seemingly similar question already, but it doesn't explore what happens if you don't need to do an ARP request at all, which is what seems to be hindering the communication there. The ...
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4answers
109 views

What if a host makes an ARP request for an IP outside its subnet?

I have read other similar question on the forum and none have completely answered my question. But to understand my confusion, you would need to know what else I'm confused about. Is ARP a layer-2 or ...
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0answers
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What are non-learning and learning VLANs?

I was going through some IEEE standards for switches (IEEE 802.1aq and IEEE 802.1Qca), and came upon a terminology of learning and non-learning VLANs. I read that learning VLANs are used in Shortest ...
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29 views

Configure VEPA on Mellanox MLNX-OS MSN2700

Can anyone please help me with configuring reflective relay on Mellanox MLNX-OS MSN2700 (Mellanox switch)? This is to enable configuration of VEPA(Virtual Ethernet Port Aggregator). I was able to find ...
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50 views

SSH Key Generation

I have an issue where I can't SSH into to switch due to a connection refused fatal error after a switch rebooted. One of the rsa key that is in the switch that I think is used in the switch is : Key ...
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2answers
30 views

Write command for only saving the config to power memory

I'm confused on what command to use on a cisco switch where if the power is unplugged from the switch, I lose the configuration I saved and it reverts back to the previous config. I've been ...
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2answers
54 views

How do layer-2 devices (bridges/switches) join a multicast MAC address?

I was going through the IEEE 802.1Q (2018) standard on my own. The standard speaks about group addresses, and how these group addresses are learned by transit bridges, which is all fine. But how do ...
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1answer
82 views

Multiple IP address on an unmanaged switch

Sorry if this question have been already asked. My ISP is providing multiple public IP's on an interface. Can I use an unmanaged switch to conect to ISP's interface and then connect this switch to ...
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1answer
32 views

If 10/100 ports means the ports can be connected as ethernet and fast ethernet, why show interface status command only show fast ethernet? [closed]

How come the answer for question no. 5 is C? If 10/100 ports means the ports can be connected as ethernet and fast ethernet, why show interface status command only show fast ethernet? Figure-1: ...
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2answers
43 views

Do switches send their own extra traffic? [closed]

Doing a packet capture I noticed some unknown extra packets that might have come from the switch. Is this what happens and why? Did not see an answer from a quick search. I was under the impression ...
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3answers
63 views

Does duplex depend on the cable or the interface?

I wanted to know what made a Duplex system work? I always thought it was the Switch that made it work. But I just read on my Cisco course 2 things that made me question it. It said this, and made me ...
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1answer
46 views

Is it possible to configure Cisco ASR901 as a layer 2 VLAN switch?

I have been fiddling with a Cisco ASR901 for a while now, but I can't wrap my head around configuring it as a layer 2 VLAN switch. Is it not possible to configure one of its Gigabit Ethernet ports as ...
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1answer
29 views

How can network switch recognize the connected device is on? [closed]

I was just using a unmanaged switch and IoT devices, and I noticed that the LINK/ACT LED turned on and blink during the boot sequence of device. Then I wondered how network switch recognized this ...
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1answer
84 views

Troubleshooting ethernet->fiber->ethernet with media converters

I'm trying to get the following setup to work: ethernet switch <---> media converter <---> fiber cable <---> media converter <---> ethernet switch The switches are identical tp-...
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2answers
65 views

Why are ISPs arranged in hierarchies?

ISPs are organised in a hierarchy where the Tier 3 ISPs are connected to Tier 2, and Tier 2 ISPs are connected to Tier 1 ISPs. Why are they organised in a hierarchy? Is it because if all devices were ...
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2answers
145 views

transfer vlan from one cisco switch to an other through a central cisco switch

I can't figure out how to pass one vlan from one switch to an other: Let's say, I have 2 valns: Vlan 1 and Vlan 2 3 cisco switches: Cisco Catalyst 3560g (central switch) Cisco SG-300 (with native ...

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