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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16 views

Download ExtremeXOS

I need to update the extreme switch, I found a lot of instructions but I don't know where to download the latest version of extremeXOS. Thanks a lot in advance for your help.
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Ethernet cable works when plugged in directly, but not through modem [closed]

I have set up an ADSL modem/router as a switch, by forwarding the DHCP requests to my main router which also fulfills the role of a DHCP server. I have achieved this by plugging in the ethernet cable ...
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SSH into home lab switch [closed]

I have a home network on the 192.168.5.0/24 subnet using a pfsense router. I'm trying to setup a home lab with some older Cisco routers and switch 1841 and 2960 respectively. My 1841 is plugged into ...
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Working with credentials encrypted credentials on Aruba / HP switches

I come more from a cisco back ground and there when i show the running configuration i can see the encrypted / hased local user password. This makes it more secure to have in a automation tool where I ...
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What is the best way to update a Cisco Switch? [closed]

I have to update the IOS for a Cisco Switch. What is the best way? Should I do it via TFTP or USB? What are the steps or CLI needed?
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Number of ports in a switch [closed]

How many ports does a network switch have? Is there any hard and fast rule or does it depends on manufacturer's decision. Also what influences the manufactures' decision to put certain number of ports ...
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How do I determine an Ethernet switch that can be powered using PoE-compatible injector? [closed]

I have a task to make a small electrically autonomous network (powered by several usual UPS units for now and maybe later by a much bigger external accumulator unit). All the PC stations are laptops ...
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2answers
29 views

Proxy-ARP when the destination device is connected to the same layer-2 switch, but belongs to a different subnet

I have recently learned about Proxy-ARP and am slightly confused about what would happen in the following scenario. Let's say I have two host devices A (IP: 10.0.0.10/24) and B (IP: 10.0.1.10/24) that ...
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28 views

Dropping packets when mirroring a switch trunk port

I'm building a test lab to support a networking monitoring application I'm developing. I have written a simple UDP packet generator and receiver, and I use iperf3 to create some bulk background ...
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1answer
27 views

How does a switch decide what mac to use for Root election in STP?

I know that for the STP a root switch or bridge is to be elected based on the BID that consists of a priority value and the MAC address of a switch if the priority is the same then the MAC is the ...
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50 views

Tagging a VLAN or not

I want to create a wi-fi network for guests using access points. I asked to the IT provider a dedicated network with its VLAN and it is: 172.16.0.0/24 VLAN ID 344 The above network is configured on ...
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54 views

How does a switch know when and how to forward traffic to a router

I generally understand how L2 switching works. I want to understand how a switch and router work together to send traffic to a device off the L2 network. For example. Computer A tries to send ...
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N routers but only one valid dynamic gateway

I'm not able to figure out a good strategy for this situation. There's one router per client and all the routers are in the same network. Each router is able to connect to an external router in a ...
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176 views

Is it possible get fragmented if the packet size is less then MTU?

I'm writing a socket application that is running on Linux. My server machine is connected to a switch that is connected to a network. There are also other servers connected to the switch. My client ...
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2answers
103 views

How to populate ARP table without having to ping every device individually through the console on a Brocade ICX 7750 switch

I need to make a port-IP diagram and so far the best way to do this seems to be through show arp after consoling into the brocade switch. The arp table is empty however, and the only way I have been ...
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1answer
47 views

L3 Switch acting both as a router and as a switch for the same packets

I am trying to figure out if an L3 switch is able to act as a switch and as a router at the same time for the same packets. Consider the following architecture: I would like to set up VRRP for both ...
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22 views

Why Ping Reply Succcess from different subnet IPs

In the university lab, i manually added IP in two ubuntu machines. PC1 IP 10.129.2.33 255.255.0.0 and PC2 IP 10.129.2.165 255.255.255.0. I connected first both computers with direct ethernet cable ...
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28 views

What is the difference between these two different network security devices?

I have a choice between these two network security appliances, however the only difference I can see is the year and I don't know what that year means. SONICWALL TZ300 WIRELESS-AC SECURE UPGRADE PLUS ...
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27 views

Can port mirroring be used to convert single video stream to multiple video streams?

I am new in networking and had a basic query regarding port-mirroring. A video stream is taken from camera-based software system and is being fed to a distribution system. For high availability (...
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1answer
27 views

Computers in an unmanaged switch cannot communicate with one another [closed]

TL;DR: I have > 2 computers in an un-managed switch which can't communicate with one another i.e. can't ping or ssh among one another. Long story: As per the diagram my router can reach the ...
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1answer
32 views

Non [R]STP switches in LAN ring topology

I am revamping a simple network, which is based on cascaded, standard, unmanaged PoE switches. I am also adding a redundant loop closing wire, from the last switch to the first one, which at the ...
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1answer
41 views

What prevents a device from receiving its own multicast stream, and can it be turned off?

I know that it is normally not possible for a device to receive its own multicast stream on the same network interface where it transmitted said stream. I also understand why this is sensible, and ...
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1answer
75 views

Aruba 2930M - the NTP server is unreachable

My Aruba 2930M switch cant reach the NTP servers. Below is the following conf: ##################### OOBM IP Address 192.168.90.34 IP Version IPV4 IP Mode Manual Subnet Mask 255.255.255.0 ...
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Cisco Nexus Switch Initial Configuration

We just purchased a Cisco Nexus 93108tc-ex switch to replace an old HP switch. I am new to Cisco-NX-OS. Before putting it into service, I wanted to do a quick check to make sure things were good. I ...
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2answers
49 views

Connecting two HP 2910al Switches using SFP to get 2Gb/s speed

I would like to Connect my two HP 2910al switches using SFPs to get a maximum of 2G links. is this possible, and how? I want to make both of them to use the IP address (ex 192.168.2.xxx). I have the ...
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33 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.
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80 views

Do DSLAM and OLT function like a switch?

Let's say for example we have the following hypothetical topology: In each network, can each user communicate with each other? For example, can User 1 ping User 2?
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73 views

Where are ATM switches located in real life?

Consider the following diagram from this link: https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/bbdsl/configuration/xe-3s/bba-xe-3s-book/bba-ppoe-atm-xe.html If I am correct, here's how I see it ...
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How do I know the switch is layer 2 or layer 3?

Is it possible to find the switch is Layer3 or Layer2 in (Switch)CLI? Is there any command to check whether the switch Layer(Layer 3 or 2) in CLI?
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1answer
28 views

Port only in trunk mode vs encapsulating the frame

A network with 2 switches, each switch has 2 vlan, one called vlan 10 and another vlan 20. A port-channel with 2 uplinks (trunk). Why in a layer 2 scenario I don't need to configure the trunks with ...
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54 views

How to Change the Date on Cisco Catalyst 3750x Switch

We are using cisco catalyst 3750x 24 port switch series How to Change the Exact Date(Singapore) on a Switch ASW-G-L09-001#show running-config Building configuration... Current configuration : 11883 ...
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29 views

Linux networking + mix of auto-negotiation of yes/no [closed]

we have 10 servers with Advertised auto-negotiation: yes as the machines with driver driver: i40e driver: i40e version: 2.3.2-k firmware-version: 10.51.5 expansion-rom-version: bus-info: 0000:12:00.0 ...
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1answer
27 views

Where can one find how much memory is currently allocated to logbuffer?

Do you know where it can be checked, how much memory is currently being used by the logbuffer? some-switch#show log | i Buffer|Trap|udp Buffer logging: level debugging, 2268 messages logged, xml ...
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1answer
37 views

How to route incoming UDP Unicast traffic to multiple computers

I have a Ubiquiti ES-16-150W and I must somehow route incoming UDP Unicast traffic to multiple computers. Ideally I would change the Unicast to Multicast but unfortunately the device which is sending ...
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1answer
41 views

Trex not receiving any packets

This is my setup to benchmark my server Diagram Trex version v2.88 Trex server MAC ens2f0: f8:f2:1e:5c:bf:78 ens2f1: f8:f2:1e:5c:bf:79 DUT server MAC eth0: fa:16:3e:1c:be:82 eth1: fa:16:3e:d5:37:b1 ...
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1answer
127 views

GNS3 switches vs Real switches performance

I want to emulate the performance of switches in GNS3, and the focus is not the configuration of switches. My questions are: Do emulated switches perform worst than actual switches? Are emulated ...
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35 views

Using GNS3 to Sniffing Packets on Siemens RuggedCom RS900

I am using GNS3 to simulate an environment. I have 4 docker containers which all host Python programs. Three of the devices communicate with each other via the programs (Program 1, Program 2, Program ...
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1answer
27 views

Network equipment in low temperatures [closed]

I need a switch that will connect all of the ethernet cables that run through my house. Unfortunately all of this cable came out in a box which is situated outside the house. The box is somehow sealed ...
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1answer
47 views

Is there a way to filter an HP switch's log output to only show events for the specified string?

When troubleshooting a host connectivity issue, I log into an HP 5412, for example and look for possible issues on the one port by pulling up the logs. Is there a way to filter/sort the output so ...
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1answer
44 views

Is it possible to assign an IP to a tagged dual-mode port (Brocade)

I have a router (ubiquity USG) and a Brocade FCX648 Layer 3 switch. (I have a second one in a stack, but that's unrelated). The end goal is to be able to connect the switch to my router, provide IPs ...
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1answer
36 views

Is configuring FEC mandatory in designing 100G networks? What's the difference FEC makes with DACs vs optics?

I have read a lot of information online but I am still not sure when do we exactly configure FEC and what are the advantages/disadvantages of configuring it. Does DAC transceivers always need FEC to ...
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3answers
620 views

How to remove switchport mode access from Cisco Switch 2960?

This is in Cisco Packet Tracer - this is not a real switch. Default interface config on Cisco Switch 2960 looks like this ! interface FastEthernet0/10 ! Then I put it in switchport mode access ! ...
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1answer
33 views

A 2Gbps backbone bandwidth of a switch with 10/100Mbps ports

What does a "2Gbps backbone bandwidth" of a 10/100 Mbps switch mean? The switch has 8(downlink)+2(uplink) ports.
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1answer
28 views

Where can I find virtual switches to learn about layer 2 [closed]

I am learning about layer 2 networking, arp, cam tables, mac addresses etc. I will like to see some of these things in action but I do not have access to physical hardware now, does anyone know of a ...
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70 views

Untagged VLAN in EVPN+VxLAN

I am dealing with very strange issue but wanted to check with experts if i am doing anything stupid or not. I have small size EVPN+VxLAN clos network (OSFP+iBGP+Multicast+Arp-suppression (no ...
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45 views

How does an L3 Supported Switch differentiate L2/L3 Packets?

I had a managed or layer 3 supported switch (it can process both layer 2 and layer 3 packets). Now a packet from a connected host comes to it, sending traffic. How does the switch decide to process it ...
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1answer
58 views

BGP unnumbered on P2MP link

I'm wondering what will happen if BGP unnumbered session is configured on a link that has multiple routers on the other side which are both IPv6-capable and will both reply on RS and produce RA ...
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2answers
391 views

Can't add VLAN in the “allowed VLAN”

Why is this command not accepted? switchport trunk allowed vlan add 52,160,176,177,247 I tried adding only one VLAN; it's also not accepted. No error is shown or anything; it's just not showing when ...
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1answer
28 views

Intermittent network failures on unmanaged switch [closed]

So the setup first. I've got MikroTik rb3011 as my gateway with one WAN and other ports in bridge. On the MT bridge I’ve got two switches. one is cisco sg300 and for the building nearby there is ...
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11 views

Does the control packets flow into a router/switch through forwarding plane? [duplicate]

I know there are two platforms in any networking device separating the control packets from the traffic, which I call control plane and data plane. My question is, how does the control packets enter ...

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