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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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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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Huawei Switch - Reset Console Password Without Resetting Configuration? What he did:

Reboot Ctrl+B (BootROM input) Pressed "Clear password for console user" (confirmed) Made Reboot (from menu item) Everything remained in the same place. The password is still prompted. On ...
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1 answer
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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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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 ...
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1 answer
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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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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
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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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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 ...
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1 vote
1 answer
317 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 ...
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1 answer
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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 ...
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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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1 answer
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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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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 ...
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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 ...
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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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2 votes
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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1 answer
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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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3 votes
1 answer
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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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2 answers
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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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3 votes
1 answer
128 views

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) ...
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2 votes
3 answers
67 views

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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6 votes
5 answers
1k views

Dividing a network into subnets using a router

I am learning about how L3 and IPv4 addressing works and I need some clarity on certain things. I've encountered the following topology So in this topology, the router stands in the center and ...
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3 votes
2 answers
167 views

Time taken to complete a routing table update and possible interruption

I am wondering if a routing/forwarding table update at a switching node (e.x., a switch or layer-3 router) can cause momentary packet drop or increased delay for a data stream that will traverse this ...
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2 answers
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Create routing between non-VLAN router and HP 2848 Procurve

I am trying to create this routing but getting some issues(or not having the routing). Scenario: simple router: 192.168.1.254 (with DHCP server for all network that is providing wifi and internet to ...
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1 answer
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L3 Switch as network core and ssh connections

We have several L3 switch as core for our sites (central and remotes). These switchs have multiple IPs for vlan routing. These IPs are gateway for vlans. Is it possible to avoid ssh connections for ...
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1 vote
2 answers
96 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 ...
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0 votes
3 answers
52 views

Switch: port and NIC relation

I wonder if a switch has one NIC per port? for example, does a switch with 24 ports has 24 NIC? Many thanks in advance for your help.
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Why collision domain occurs in hubs but not switches [duplicate]

if anyone knows the actual point and in depth answer to my question please help. the links in the comments didn't helped at all Most of the websites which i saw are just vaguely saying that collision ...
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0 votes
3 answers
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What kind of communication does a switch allow between devices connected to it?

I am a beginner and currently learning network devices and I got a little stuck on switches. Basically, what I've learned is that they connect/provide a wired connection between computers on the same ...
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5 votes
2 answers
142 views

STP convergence process needs detailed explanation, please

So, I understand how STP convergence works on high-level. However, when I am trying to look into the process deeper, I run across some doubts I would appreciate someone could clarify to me. Here we go:...
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5 votes
1 answer
380 views

Cisco 9300 Software upgrade without automatic reload

Is there a way to upgrade a Cisco Catalyst 9300 switch to a new software version without the switch automatically reloading as part of the initial install process? With other switches (eg Cisco ...
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1 vote
1 answer
61 views

Layer 3 switch as access switch

Is it possible to have Layer 3 switches at access level (meaning the PCs are connected to it) if multiple VLANs are spread out accross multiple switches? For example, VLAN 10 is present at SW1 and SW2....
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-1 votes
2 answers
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Multicast MAC using destination MACs

I am working on a routing algorithm which involves multicasts, my question is: Is there a possible way to convert a list of MAC addresses to a single multicast MAC address for configuration purposes? ...
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1 vote
0 answers
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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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0 votes
4 answers
125 views

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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5 votes
1 answer
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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0 votes
1 answer
752 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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3 votes
1 answer
143 views

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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1 answer
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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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0 votes
1 answer
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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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0 votes
3 answers
47 views

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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0 votes
1 answer
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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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1 vote
2 answers
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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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0 votes
3 answers
88 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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0 votes
1 answer
74 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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0 votes
1 answer
67 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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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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1 vote
1 answer
118 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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