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Questions tagged [switch]

a device that bridges network segments, operating at the OSI link layer level.

Switches (in the context of this site) are devices with multiple network ports, which allow interaction between all devices connected to these ports.

Basic switches operate at the data link layer level (in TCP/IP networks) and forward packets based on the link layer address in the packet headers. They are different to hubs in the way that hubs generally broadcast incoming packets to all other ports, whereas switches keep tables of link layer addresses they have seen at specific ports and only forward packets to the relevant ports. Basic switches are also known as layer 2 devices.

Higher grade switches can include functionality at higher layers of the OSI stack. This can range from IGMP snooping (for multicast support) and VLANs through to NAT, VPN, firewalls or even application layer functionality (web caching or proxying). Such switches are known as multilayer devices.

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Getting Started with NIC and Switch Redundancy

Currently with my servers, they all or almost all have 2 nics with one in use. Each NIC is is of course connected to a single switch. What do I need to do to make this redundant in that both NICs are used and connected to different switches, but…
Kyle Brandt
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When to use routers and when to use layer 3 switches

If you were to connect two buildings on the same site via fiber, what is best to use - routers or layer 3 switches? The layer two switches in each building have VLAN's, so these will either connect to a router or layer 3 switch, and then the router…
The_Bear
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IP conflicts with a networked printer

I have 2 computers (Mac with OS 9 and a desktop PC (XP)) that both print to a networked printer (large Xerox Phaser 7700). The printer and the two computers are networked through an old ethernet switch. At the moment, the computers use DHCP. But…
user26379
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Configuring a custom HTTPS certificate on a Netgear Switch (e.g. GS724T)

Since it’s quite annoying to get the invalid certificate warning every time I connect to my switch, I want to install a custom HTTPS certificate signed by a Certificate Authority my machines trust. But I can’t figure out Netgear’s ridiculous…
Andrew Marshall
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Expect script too fast: add a sleep between each line read from a file

I am trying to automate switch commands. It's almost all good, but when the expect script reads each line from the file containing my switch commands (listed line by line), the switch seems to stop after about 10 or 15 commands, i think the buffer…
2legit2quit
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sniffing on a switched LAN

I often find myself in the position of having to sniff on a connection between for example an arm board I am developing on, and another computer on the network, or out of the network. The easy situation is when I can install a sniffer on the…
shodanex
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HP ProCurve Preventing Loops and Users Plugging in Unauthorized Switches/Access-Points

We have a HP ProCurve 2530-24-PoE (J9773A) switch, recently I had a user who plugged in an Apple wireless hardware device to the network - whenever it was connected I got a ton of broadcast warnings from the switch, intermittent bouts of packet loss…
morleyc
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HP Procurve 2920 VLANs with DHCP cannot ping

I have problem setting up working VLANs and DHCP server on HP Procurve 2920. My problem is that I cannot even ping computers between VLANs with static ip addresees. winXP pc on VLAN101 with 192.168.1.1 static IP default gateway 192.168.1.2 win2008…
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Can internet gateways be plugged straight into a layer 2 switch?

tl;dr Internet gateways (eg., cable modems, fiber optic gateways) don't function properly when they aren't behind a device with "layer 3" or routing capabilities, correct? Incredibly long backstory I'm in an argument with my boss about the root…
Eric L.
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HP 5500 switch manual states SNMP traps impact performance and advises against their use unless "necessary" - why?

We just bought two HP 5500-24G-4SFP beasts and I'd like to properly integrate the switches into Nagios. Most of our current monitoring polls actively via SNMP so I figured it would be wise and use the occasion to get snmptrapd/snmptt working so we…
Adrian Frühwirth
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Route traffic directly between nodes in a cluster

I apologize if this is a really dumb question. Objective Ensure that traffic that is meant to go between nodes in a cluster does not (inefficiently) go outside the cluster and then come back in, but goes directly between nodes. Background We are…
Chris Dutrow
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Difference between trunk and tagged port

I am reading some wikipedia articles and RFC 5517, studying VLANs, and I don't recognize the difference between a trunk port and a tagged port. From what the material I am reading says, a tagged port is used to allow a host to be seen from…
Ramy Al Zuhouri
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Is there a way to tell a device name (computer name) which connects to the internet jack from a wall without accessing the switch to find out?

I'm not familiar with networking and have been trying to search for info online. From what I have found, there's no possible way to find out the particular physical port of a switch that a computer is connected to w/o accessing the switch? Am I…
Buzzy
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Junos: find out each interface's ip

Sorry if my explanation is confusing. I need to get all the ip addresses of a Juniper Switch and Router (different models). On Cisco IOS I can get that with show ip interface brief | exclude unassigned: cisco_device>show ip interface brief |…
Megaslav
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Is it possible to mix jumbo frames VLAN and standard mtu VLAN on the same switch port?

If a managed switch and all attached devices both support VLANs and Jumbo Frames, is it possible to mix VLANs with jumbo frames and VLANs with standard frames on the same switch port / ethernet card? If it is possible, should I expect it to work in…
Luke404
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