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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Setting up a D Link Switch for PTP Passthrough [closed]

I have several devices which support PTP (Precise Time Protocol) and a D Link switch which connects all those devices. As far as I know, the switch I am using does not support PTP itself, but I was ...
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Pros and cons of directly interconnecting routers and firewalls vs via switch in an enterprise-network? [closed]

In a medium-sized enterprise network, let's say you have a pair of datacenter switches, a pair of distribution switches, a pair of internal core routers, a pair of firewalls, and a pair of edge ...
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Configure DHCP for VLAN [closed]

I'm configuring DHCP for VLAN on a router. At last, the computer can not retrieve the IP address. Below is how I have configured. Switch Switch>en Switch#conf t Switch(config)#vlan 10 Switch(...
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2answers
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How does DHCP work?

I'm carrying out an experiment to test the mechanism behind DHCP. In this topology, I disable the link between the switch and the router. However, the computer still request IP address successfully. ...
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Wich setup should I use? [closed]

I want to gain some experience setting up a network, but I am already in a network wich I can't play around with (setting up firewalls, dhcp servers etc.). I'd also like to create a webserver, assume ...
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About CAM table in switch [duplicate]

When does layer 2 switch learn about MAC address & port mapping (A)when it receives arp request broadcast frame from a host trying to resolve destination IP to mac IP or (B)when it receives frame ...
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1answer
1k views

Does an unmanaged switch deal with IP addresses at all

My belief is that an unmanaged plug-and-play layer 2 network switch only deals with MAC addresses. When computer A on a local network wants to communicate with computer B for example through the ...
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1answer
43 views

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 ...
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1answer
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HSRP on multilayer switch not working

I have this network topology in Packet Tracer, and i wanted to implement HSRP on both of the multilayer switches. So what i made here is the switch on the left, both the laptop and the server are on ...
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31 views

How can u assign IP addressing for point to multipoint switches that connect to only one router?

I was wondering if I can assign two network address in a LAN while the switches are point to multipoint which connect to only one router. How will me DHCP going? Router - Switch 1 - Switch 2,3,4
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Switch's cut-through feature, how is this possible with the clock difference between interfaces?

At the physical layer, two network interfaces of a switch run at a different clock since the reception clock is recovered from the signal and the PCS layer doesn't support any pause/empty cycles. ...
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3answers
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One Missed Point in Data Link Layer Concept?

I see one Course Lecture as follows: I trouble in understanding "source address for the next node’s reply", What is the meaning of next node's reply?
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How Switchport Trunk work?

I the scenario below; I can sniff the traffic between Win7 and UbuntuSrvr on Line A but this is cannot be done on Line B Note: ports are on trunk mode. Why this is happening??
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Is this description of data transmission over L3 switch correct?

So I'm trying to describe how data is transmitted over a layer 3 switch (within same Vlan and between Vlan) but I'm not sure if I have understood it correctly. Can anybody verify if this description ...
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3answers
76 views

How to learn IP addresses in a LAN

For communication with machines in the same LAN, hosts do ARP for translating the IP address to MAC address, which means, IP addresses are already known to each other. My question is, how does the ...
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1answer
44 views

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 ...
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1answer
53 views

How does a network switch prioritize ethernet frames with the broadcast MAC address?

How does a network switch prioritize the incoming ethernet frames that all have the broadcast MAC address as a receiver address? So, we have the following situation: a 10GE network switch with 3 ...
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46 views

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 damage,but the fiber is still ok,will H2 damage too in the future? i have a thinking to ...
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1answer
73 views

Why does only the root bridge send RSTP BPDUs after sync?

From a recent packet capture, after the sync process in RSTP, only the root bridge sends RSTP BPDUs every 'hello' interval. Why is it so? Shouldn't all switches send BPDUs every 'hello' interval since ...
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Why does RSTP send proposal bit and agreement bit as '1' initially?

From a recent Wireshark capture of a RSTP BPDU on a switch, both proposal and agreement bits were set to '1'. In my understanding, initially both switches 'propose' themselves as root. The better root ...
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1answer
70 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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1answer
45 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
77 views

Switch with VLAN: How to map between VLANs networks

Assume the following network layout +--------+ ----------------------------------------| Switch |----------------- | ------------------------+-----...
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1answer
40 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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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
35 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
46 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
115 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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27 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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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
29 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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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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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
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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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59 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
81 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
30 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
199 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
234 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
76 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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28 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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91 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
73 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
65 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
121 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
34 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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