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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14 views

Connecting a router with 2 GBit ethernet cables to a switch [closed]

I have a FRITZ!Box 7490 that has 4 gigabit LAN ports. Since I have a lot more devices than that I'd like to connect them to a 16 port switch and connect that switch to to the FRITZ!Box. Since I also ...
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If a Linksys router is plugged into a cable modem, vs a switch is plugged into a cable modem, is there any difference? [closed]

Say in the old days when we have a cable modem, and it only has 1 Ethernet socket, we can connect one computer to it. But we can buy a Linksys router and then able to plug that into the cable modem, ...
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1answer
50 views

How do computers send switches packets, if switches don't have IP or MAC addresses?

I am new to networking, so please excuse me if I am saying stupid stuff. From my understanding, PCs are sending packets to switches, which then decide which physical port to forward that packet to. ...
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3answers
47 views

setting up a VLAN and joining 2 buildings through underground cabling

I am pretty much a newbie when it comes to networks so forgive me in advance if this question seems odd. So here's a situation I am trying to figure out. There's a company who operates in 2 adjacent ...
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1answer
29 views

I Cannot Ping Switch to Device, but can ping Device to Device

I'm currently troubleshooting a network i built and I'm having an issue with ping connectivity, i have set up DHCP and DNS and my end devices can get IP's from DHCP as well as i have intervlan ...
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Switch and Router for a 500mbps connection [closed]

I have a 500mbps internet connection into my small office. We have about 10 computers. What hardware should I be using for my router and switch to that I can insure they are not the bottleneck?
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1answer
66 views

Switch doesn't learn MAC of a connected device

I am new to networks. What does it mean when a switch doesn't learn the MAC address of the connected device? And how can VLANs can impact that?
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1answer
27 views

MACsec Switch-to-Switch authentication/encryption

I have some questions regarding MACsec IEEE 802.1 AE-2018 and PNAC IEEE 802.1X-2010. As I have heard there is no swich-to-switch protection with 802.1X-2010 by this standard I want to know where is ...
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1answer
29 views

What is the packet protocol used for communicating switch configuration changes over the network? [closed]

I am trying to isolate the packets used to communicate a switch's configuration changes. More specifically, whenever I use the online tool on my laptop and configure the switch (and hit save) I want ...
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19 views

How are switch tables updated in a multi-switch network? [duplicate]

I have a network structure like the below: Switch A - Switch D / \ Switch B Switch C / | \ / | \ \ 1 2 3 4 5 6 7 Where 1..7 are hosts. If 1 were to send a ...
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28 views

Wireshark filter to display al packets which have traveled through switch

I am trying to filter my packets based on whether or not they went through specific switch. This router has the ip address of 192.168.1.235. Is their a way to do this using Wireshark filters?
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31 views

How to combine multiple ADSL lines?

Before beginning, I'm totally new to advanced network topics and not working as a professional network engineer or so. Just trying to learn some stuff. My problem is, I have 3 different ADSL (or VDSL)...
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1answer
33 views

Why does HPE disable STP by default? [closed]

It this certainly true that switches needs STP to avoid loops or broadcasts storms, but recently I saw the configuration of my Hewlett Packard switch and I noticed that it has STP feature disabled by ...
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1answer
52 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 ...
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2answers
54 views

Will the switch itself interfaces store in the MAC address table?

I have a topology like this: the port and mac address map: Mac address Interface ----------- --------- aa:aa:aa:aa:aa:aa - pc1 bb:bb:bb:bb:bb:bb - pc2 cc:cc:cc:cc:cc:cc - sw1_ac dd:...
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1answer
27 views

sfp-25g-sr-s alternatives

I work at a media company and we have a room where we're essentially having a spine leaf topology implemented for our network. Now there's 4 spine switches and 6 leaf switches, the sfp we're using are ...
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1answer
30 views

What is the difference in packet structure for tag VLAN and port VLAN

I am new to networking. I just want to know the difference in ethrenet packet structure for tag based VLAN and port based VLAN. For tag VLAN, a VLAN tag is added to the ethernet packet frame so that ...
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1answer
55 views

Is WIFI like a hub, switch or router?

A wireless router; the wireless part of it, is that a layer 2 or layer 3 device? I have heard that a WiFi router is just a wired router with a built-in wireless AP, and since a wireless AP functions ...
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2answers
47 views

Networking switch boxes distance from 480v transformers

I am working on a network layout for a manufacturing plant and ran into a situation I am just not experienced in. We have 6 steel beams from the ground to the ceiling that we are planning on mounting ...
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1answer
73 views

Connecting a 10 Gig server to a 1 Gig switch

Recently we purchased 5 servers. It has 4 10GB ports + 1 1GB Management port, as follow: 4x 10GB ports per server (2x traffic, 2x ISCSI), and (1x 1GB management port) However, we are trying to see ...
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4answers
2k views

Which specs should I look for (or avoid) when searching for a iSCSI 10Gbit ethernet switch, independent of brand?

I've been tasked with selecting two new switches intended to be our new iSCSI SAN backbone. Currently, we are using two Dell N4064 improvised for the task since that's what we had when the need ...
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2answers
114 views

Whats the difference between VOICE VLAN and ACCESS VLAN

Can someone please tell me the difference in Layman's termsfor these 2 configurations? interface FastEthernet0/1 description PHONES switchport mode access **switchport voice vlan 51** spanning-...
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1answer
44 views

OSPF neighbor not working

I'm currently designing a spine leaf network, 2 Spine switches and 4 leaf switches. btw this in packet tracer. So in order its Spine1# and Spine2#, then Leaf1#, Leaf2#, Leaf3#, Leaf4#, and addresses ...
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1answer
62 views

Why can't get host's mac address on l2 switch through snmp? But can get it on l3 router

I am trying to get computer's mac address through snmp. I have an envirmont in GNS3: l3 R1's image is vios-adventerprisek9-m.SPA.157-3.M3 l2 SW1's image is viosl2-adventerprisek9-m.SSA....
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1answer
35 views

How does the swtich know if a packet needs layer 2 switching or layer 3 routing?

I have a network topoloty as follows A --------- B --------- C /|\ /|\ /|\ / | \ / | \ / | \ A1 A2 A3 B1 B2 B3 C1 C2 C3 A, B, C are ...
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2answers
319 views

Why the network switch drop the frame acording to ethertype/length?

I have a network switch IC , and I am using to the send BPDU packet. I can send packet with 2 byte ethertype/length field like this : 81 00, 80 00, 91 00 and some special hex number. But if I try to ...
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31 views

Do Cisco SG300 switches perform CRC error correction?

Cisco SG300 series switches are capable of detecting CRC errors as can be seen in the interface counters. But can they correct CRC errors and pass the frame along to the destination or the only way ...
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1answer
71 views

Using L2 switches for multiple connection

For proof-of-concept, I need to build a small network but have not enough L2 switches.Is there anybody help to solve this problem? Below is the network I want to build. L3SW---L2SW1---L2SW2---RT---...
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2answers
46 views

How do i console into a 3com 4500g switch?

I am using a USB to console and changed the rate on it to 19200 data 8 and stop rate 1 and i cant connect console in ? nothing appears on Tera term or putty. i don't know if i am doing it right.
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32 views

Do switches need any configuration?

I created a testing gns3 project. When I click "console connect to all nodes", only connections to routers and vpcs were created. Why no connections to these switches? Does that mean switches don't ...
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1answer
43 views

What happens if I press the Button in a Stack Setup on a 2960-X?

Someone recently push the Mode button for too long and the Switch Stack restarted in Express Setup. Is this the normal behavior on the Mode Button? Where were debating that the Whole Stack was not ...
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150 views

Configuring a network for 100% isolation (for security)

I'm configuring a LAN for an office. It's a new setup, and therefore there are desktops but no servers and no PC-to-PC communications - everything is on the cloud. The exception to this are several ...
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1answer
38 views

Using a VLAN to Completely Isolate Devices from the Internet & Other VLANs

I have a Cisco SG350-10P Managed Switch, and currently have two VLANS on it, the default VLAN 1 and VLAN 10. I want devices connected to VLAN 10 to have no ability to communicate with the internet or ...
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1answer
48 views

Correct vlan/interface config for connection to upstream provider network

We have recently switched from HP Procurve series to HP Comware based switches. A configuration which has been working on Procurve doesn't seem to work on Comware. Here are the details: The provider ...
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2answers
116 views

Can a single subnet work across several switches?

New to networking and studying hard but limited access to a kit to try things at the moment... My question is - if I had, for example, two Layer-2 switches cable connected, could I have devices on ...
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1answer
42 views

Will Main Router be overloaded in this scenario?

The Main router in my planned office network assigns IP addresses to all PCs through DHCP and also connects to the internet via GPON modem. 5 PCs and 1 server are connected to a 8 Port simple switch. ...
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1answer
56 views

Is there a method to modify bits in IP packets with OpenFlow?

We've already known that ovs-ofctl provides many actions to modify packets like set_field, load, move... but I can't find a suitable action or action combination to modify a bit in the IP packet ...
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10 views

Finding device using Avaya Configuration and Orchestration Manager

Is it possible to search for a specific device using either it's IP or MAC address using Avaya Configuration and Orchestration Manager
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1answer
166 views

What is the purpose of native VLAN on a trunk link?

Most VLAN articles I've read recommend avoid using VLAN1 for ports with untagged traffic (aka access ports). I've heard enough of this nonsense. Except for the reserved values of 0x000 and 0xFFF, a ...
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2answers
67 views

Is there a way to manage IP space with only a switch?

Is this scheme possible? External provider = External provider of the internet Generally speaking, is there a way to assign a public IP address individually for each server to be used when SFP+ port ...
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1answer
47 views

IP Routing and Switching Interface Speeds

I have a question that relates to routing and switches. I am looking to set up a new Firewall that will handle the routing for the network and attached to the Firewall will be a switch. Here are the ...
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1answer
55 views

Why is XGMII little endian while the network is in big endian?

Why is XGMII little endian while the network byte order is big endian (RFC1700)?
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40 views

Do I need 5 licenses for Cisco DNA Premier to connect 5x 9300 switches to DNA Center, ISE and Stealthwatch?

Cisco Licensing is very strange and I spent over 4 hours reading about its obfuscated software licensing plan. My question is simple. Do I have to purchase 5 different licenses of Cisco DNA Premier (...
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2answers
118 views

Switch Stacking and Redundancy

If switches are stacked together using StackWise, what happens if one of the switches goes down? Is switch stacking bad for redundancy?
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1answer
68 views

STP Convergence: How does a port initially in blocking state know it needs to change to a designated port?

I am attempting to gain a better understanding of how STP converges when certain state changes occur that affect the STP topology. In this scenario (see below) Switch A (SwA) is the root switch with ...
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1answer
107 views

Why do Designated Ports in STP still send BPDUs if the otherside of the link is blocking?

Is there a particular reason for a Designated Port to continue sending out BPDUs after convergence has occurred on a link where the other side is in a STP blocking state? I get the idea of a ...
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2answers
127 views

How to differentiate if a Cisco device is a L3 switch or a Router?

I need to check all the L3 switches if they are configured with same ospf ID, As i am doing it in the Cisco prime, there are routers in the inventory too. Is there a show command where i can clearly ...
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1answer
52 views

Ubiquiti APs on manged or unmanaged switch?

I have three APs, one UAP-AC-IW and two UAP-AC-LITE. I have a Netgear Smart Managed Plus Switch, mainly for VLANs with plenty of open ports. I need to either add an unmanaged POE switch or a POE ...
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2answers
145 views

Industrial Ethernet network design

looking for some advice on network architecture for an industrial switchroom with several constraints. Modbus TCP devices are located in motor control centre cells, these need to connect to the ...
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3answers
515 views

LACPDU packets to pass through unmanaged switch

I have two buildings connected through the CAT6 cable and both ends have cisco-sg350 (capable of etherchannel). Due to the limitations of the cable both the switches are connected through a unmanaged ...

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