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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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Configure vlan on Netgear switch via SNMP

I am trying to configure vlans on a netgear GS752TSX from the Linux command line with netsnmp. I have created vlan 99 on the web interface now want to control the pvid settings, egress and tagging. I have identified these as the MIBs I need to…
Russell Gallop
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ProCurve network expansion

I've hit a bit of a wall with our network scale-out. As it stands right now: We have five ProCurve 2910al switches connected as above, but with 10GbE connections (two CX4, two fiber). This fully populates the central switch above, there will be no…
Blue Warrior NFB
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What causes a switch port to receive data not destined for it?

We are having an intermittent fault which is effecting one of our control systems on one of our HP Procurve switches. For some reason, this PLC (10mbit port - 192.168.6.56) which is attached directly to the HP Switch intermittantly start's receiving…
user1693454
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How to wire 20 computers and 20 phones and 1 server into LAN?

I have currently 3 switches Two Netgear JFS524 with 24 slots, One Belkin with 16 slots. Server DSL Internet Router. Main question is how to connect switches together, two Netgear's are next to each other, yet one is about 100 feet away and holds…
John Smith
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Layer 2 topology discovery

I have been given a network (it is a LAN) comprised of switches and I need to discover the topology of that. (There may be Link Aggregation Groups (LAGs) in the network as well.) I have done a lot of search on layer 2 topology discovery and I have…
pegah s
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SNMP MIB file resource

My company(ISP) has 50+ switch models in our network, we manage them via SNMP from our web based intranet, for some Huawei switches we can't figure out the OID's we need (we usualy figure the OID we need our self, beacause we usualy don't receive…
Radu Maris
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Cisco switch, how to determine MAC address of connected device or wake device up?

switch1#show interfaces descri ... Fa0/13 up up Fa0/14 down down Fa0/15 up up ... (the lights are also on on both ports 13 and…
Alex
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Why would certain network switches stop working, others are fine?

I am sure many of us are used to (or have experienced) the routine (or at least occasional need) of having to reboot (or power cycle) a cable modem, dsl modem, router or hub/switch. However, I decided to post here in response to a recent widespread…
Scott Szretter
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Switch Floods Packets that should be Unicast

I work as a Network Admin in a big company. Lately we noticed an issue with our network infrastructure. Basically our network backend lies on a Catalyst as main L3 backend switch, and few Cisco Nexus switches as edge L2 switches, connected to that…
amito
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Jumbo frames with wireless client

I currently have the following network configuration Apple Time Capsule (Gigabit Ethernet router) 2 Windows desktop wired with Gigabit ethernet 1 MacBook Pro in wireless N mode 1 iPhone (obviously wireless) I bought a NAS and a Gigabit switch to…
Fabio
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Stacking 2960 with either 3560 or 3750?

Can a Cisco 2960S be stacked with a 3560 or 3750? If possible how? If not, why not?
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Mixing SAN iSCSI Traffic with core network traffic, Am I asking for trouble?

I am configuring a new network and had a couple questions I am finding hard to find good answers about best practices on using VLANs to separate Core network traffic and iSCSI traffic. The switches for the core network are a Cisco 24 port 3560X…
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How network devices affect TTL

When I do a ping, I can see the TTL value for each packet. For every router that I insert in between my computer and the router that connects to the internet, the TTL value goes down by one. However, inserting a switch or a hub does not have any…
Wintermute
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How to capture Wireshark packets when using a switched network in Windows

I’ve been asked by our SIP trunk provider to run a Wireshark trace on the network when we receive calls. The issue I’m having is that if I run Wireshark from a laptop plugged into the main switch I only see the broadcast traffic from the switch and…
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Need help diagnosing network performance issues

I am currently working in a developing country as a system analyst for a government department. My area of expertise is software projects, but I've come across a few issues with the network setup in my office. (Unfortunately, being a developing…
tokes
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