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Switches / Hubs

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A switch is a device that filters and forwards packets of data between LAN segments. Switches operate at the data link layer or the network layer of the Open Systems Interconnection (OSI) Reference Model and therefore support any packet protocol. LANs that use switches to join segments are called switched LANs or, in the case of Ethernet networks, switched Ethernet LANs. A hub is a connection point for devices in a network. Hubs are commonly used to connect segments of a LAN. A hub contains multiple ports; when a packet arrives at one port, it is copied to the other ports so that all segments of the LAN can see all packets.

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I need to upgrade iOS on my overseas branch switch hrs remotely ,from my tftp server switches in overseas taking too long to copy iOS.so I need any way to convert one of the 3560 switch as tftp server & upgrade the rest .
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ATEN's HDBaseT Presentation at InfoComm 2017
ATEN's HDBaseT Presentation at InfoComm 2017

Hear ATEN Product Manager YT Liang review HDBaseT technology, highlighting ATEN’s latest solutions as they relate to real-world applications during her presentation at the HDBaseT booth at InfoComm 2017.

I have a cisco SG220-50 smart switch that I'm trying to configure.  I'm able to login using putty via its console port.  My question is, the CLI commands are different.  Example I can't do show ip interface brief .  when I type in show ip ? it only showing dhcp, http, https and igmp as it's option .  What ever happened to show ip interface brief? Another example, when I try to configure line vty it's telling me unknown command.  And when I do line vty question mark, the only option is console, ssh and telnet.   Is this the new CLI or I need to update the firmware?
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hi guys

I'm on a network and realised that our Outlook was a little slow. So when i did a ping to the default gateway, I had some '1ms' pings but then I had quite a lot of '27ms' and '14ms' times.

The network is all gigabit and on SG500X Cisco switches.

How would one find out if something was occurring causing spikes like that?

If not on the switch itself, what tools would you use? Solarwinds? Whatsupgold? Wireshark?

I'm tired of applications having problems, high millisecond pings etc and never being able to absolutely pin point the exact issue when asked by senior management.

Thanks for helping
Yashy
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I reset the switch as the network I setup on ESX server with 192.168.11.0 with 192.168.11.1 gateway were not pinging from switch.
After reset I applied ip address 192.168.11.1 255.255.255.0 to vlan  1 and default-gateway as 192.168.11.254 and still I could not ping ESX.
I created new Vlan 5 and tag 1-50 to it and no untag from default vlan 1. On Esx I enable vlan 5 and still no communication. Do I have add switch management IP as default gateway or default gateway defined on switch as default gateway to switch.

Why it ping does not work even after restore of switch. Earlier I had to issue with the same setup
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How ping works between different network

Let 's say I have PC1 connected to Switch1 Vlan10, Switch1 is  connected to Router1 that is connected to Switch2, and PC2 is connected to Switch2 Vlan20

Knowing that within local subnet there is an ARP broadcast that is used by a host to get the Mac addrress of the desired IP address. in the scenario above PC1 and PC2  are in 2 different switches separated by a router and 2 different Vlans

So how does PC1 manages to get a ping reply from PC2

Any explanation will be appreciated.

Thanks
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Does anyone know where can I find the save configuration tab on Netgear GS752TP?  For some reason I can't find it anywhere.  Manual says it should be on maintenance tab but it's not.  Thank you in advance.
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I know sh ver , uptime for 2 days , 4 hours etc..
but i need to know the reason of down , if it is a power issue or reloaded administratively
thanks
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We just added a 10GB switch to our network in order th help with network speeds for our VM machines. We also added an EMC Unity 300 to our network which has 10GB NIC's however the switch Auto Negotiated the port to 1GB. Is that because we have servers connected to that switch that is running 1GB NIC cards? How can I realize the 10GB performance of the switch and 10gb NIC Cards? Does my entire network need to be 10gb or just all the servers and devices that are connected to that switch need 10GB NIC connections?
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I enabled https login on my switch.  But the https has an exclamation mark and when I click on it its telling my my connection is not secure.  Does this mean that when I log in it send my password in plain text and can be easily viewed?
Https-1.PNG
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What are the options for Teaming NICs on HP Server?  And would it work if they are on separate switches and different VLANs?
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Simple, centralized multimedia control
Simple, centralized multimedia control

Watch and learn to see how ATEN provided an easy and effective way for three jointly-owned pubs to control the 60 televisions located across their three venues utilizing the ATEN Control System, Modular Matrix Switch and HDBaseT extenders.

Hi, i currently have a stack of 5 dell N3048P's which we assign MAC based on VLAN.

We are adding another switch to the stack which will push the amount of devices past the device limit of MAC to VLAN of 256.

Because of this i am looking at other ways to move our devices in to VLAN's and i am looking for a bit of advice / guidance on how to do this.

Each port will have at least 2 devices plugged in to it, a windows machine and a POE phone. I need to be able to put the machine into either 1 of 2 vlans which i think i can do in NPS by creating groups in AD and adding the computers in to the groups then assigning each group to a different policy in NPS and assign the VLAN to that policy.

However i am a bit stumped on how i would assign the phones into a different VLAN, as they don't authenticate in any way nor would they show in AD.

Is there another way i should be doing this or am i missing something? I know i can add a VLAN that devices are assigned to via my switches if authentication is not successful but i want to use this to move windows devices that dont auth into a segregated VLAN with only internet access.

Any help with this is appreciated :)
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Dear Experts, this interface VLAN 7 suddenly went DOWN this afternoon without any change. I tried to delete interface and recreated, shut and no shut but did not help. It shows like the screenshot. Could you please suggest and explain? Many thanks in advance!

Core switch is Cisco C3750, Access switch is Cisco SG500
vlan7.PNG
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Dear wizards, does anyone know the impact of Cisco commands which we type on devices' performance (like resource, CPU...) Will it slow down the connection between users and Internet?

For example: if I type "ip access list extended ETC", then defines lots of policies on it, how many resource should them take from the Router?
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I have a situation where I have a small network with 7 Dell Optiplex 3020 computers all running Windows 7 professional.
- one of the PCs is acting as a server but also running Windows 7 professional
- this particular company is running a POS system managing a large liquor store -  where 3 of the computers have touch screen POS systems software running on the PC
- all 7 PCs run the same software and the data resides on the server PC. I believe it's SQL-based
- Recently replaced all cabling to all computers. I have an old LANcat 1500 network tester that I tested and passed all of my cable runs. However, this device is over 15 years old and it really only supports up to 10 MB L5
- I also have a very old fluke touch serious 2 network assistant. I to, is very outdated
I don't think either one of these devices can truly give me an accurate traffic and noise readings on a network

Recently to and sometimes 3 of the computers receive error codes that reference that particular PC losses connection to the database. The software folks seem to think it's network-based. I did talk to one of the software techs, and he thought maybe it was an INI file-based issue. I personally don't think it's a network issue. But I want to cover all bases and run thorough network testing.

I'm looking to invest in newer tools whether it be hardware or software without spending a ton of money.
If it's going to be a software tool, I'd like to be able to run it on a Windows 7 operating system

if…
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Debug info attached

I have configured a HP Procurve 3500 YL with the following Spanning Tree config:

spanning-tree
spanning-tree instance 2 vlan 109-285
spanning-tree instance 2 priority 0
spanning-tree priority 0

This config works well on other switches on our WAN. However, in this instance (only this switch), the topology count changes several times a minute. I believe it has something to do with ports 19 and 23. Each is configured with a single vlan and are directly connected to a Cisco 2960 switch. All others ports are connected to HP Aruba switches.

Ideas?
spanning-tree-debug
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I'm not sure what I'm doing wrong, but I'm just trying to enable vlan1, as it's administratively down.

I tried no shut vlan1 and no shut vlan 1

Both are not recognized, any thoughts?

vlan
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I have some juniper Switches EX2200 Donated and need to reset them

How do I do this???

Joseph
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I'm running older cisco swithces, 2960, 3750, etc...
I configured ntp via:
ntp server 192.5.41.40
Type: clock timezone PST -7 0

But I was thinking, I should use hostname instead, so I tried to use time.google.com, but I keep on getting a "translating" error.

Any ideas how to fix that?
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Got a small business needing a new switch, dusty warehouse environment, 16-24 port 10/100/1000, with POE for VOIP phones, doesn't need routing so it can be unmanaged layer 2 ,  Last but not least small business budget.  I would like some opinions (including why) on fairly durable switches that won't break the bank.
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Free Tool: Port Scanner
LVL 10
Free Tool: Port Scanner

Check which ports are open to the outside world. Helps make sure that your firewall rules are working as intended.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Is there a Cisco fanless 12 port or 24 port POE switch, gigabit?
I installed a 3750G-24 port switch in my office and the thing is loud, starting to get annoying.

I need at least 9 ports with the uplink, hence the 12 port minimum.
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We had a Cisco Catalyst 1900 switch die this morning and need to replace it. My concern is getting the right fibre connections. What will I need to do if I want to replace the 1900 with a Cisco Catalyst 2960?

Thank you!

Robert
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I have what i think is a basic set up but i am unable to route between vlans on certain switches.  The basic set up is an aruba 3810 that connects to two aruba 2930 switches.  There are several 2930s connected to the 2930s that are connected to the 3810 and the 3810 uplinks across an eline to another site but i am focussing on just the 3 switches; the 3810 and the two 2930s directly connected.  The configs are attached.  I am only working on vlan 5 and 10 right now.  When i connect to the 3810 on vlan 10 i can get to the 3810 IP on vlan 5 but i cant get to either 2930 vlan 5 IPs.  I am expecting the 3810 to route for all these vlans but it doesnt seem to be.  The route table shows that it should.  Ignore the ospf config info as ospf is actually disabled.  This was for testing and potential use later.
5th2930-02Current.txt
5th3810Current.txt
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I'm not sure why, but can someone tell me what I'm doing wrong, I'm trying to setup a cert so I can SSH into the switch, but I keep on getting this invalid input.


Enter configuration commands, one per line.  End with CNTL/Z.
dan_3750G_.40(config)#ip domain-name dan_3750G_.40.com
dan_3750G_.40(config)#crypto key generate rsa
                       ^
% Invalid input detected at '^' marker.

dan_3750G_.40(config)#crypto key generate rsa
                       ^
% Invalid input detected at '^' marker.

dan_3750G_.40(config)#crypto ?
% Unrecognized command
dan_3750G_.40(config)#crypto
                       ^
% Invalid input detected at '^' marker.

dan_3750G_.40(config)#
dan_3750G_.40(config)#


dan_3750G_.40(config)#end
dan_3750G_.40#show ver
Aug 10 20:05:22.226 pst: %SYS-5-CONFIG_I: Configured from console by console
dan_3750G_.40#show ver
Cisco IOS Software, C3750 Software (C3750-IPSERVICES-M), Version 12.2(50)SE5, RELEASE SOFTWARE (fc1)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2010 by Cisco Systems, Inc.
Compiled Tue 28-Sep-10 12:56 by prod_rel_team
Image text-base: 0x01000000, data-base: 0x02C00000

ROM: Bootstrap program is C3750 boot loader
BOOTLDR: C3750 Boot Loader (C3750-HBOOT-M) Version 12.2(44)SE5, RELEASE SOFTWARE (fc1)

dan_3750G_.40 uptime is 20 minutes
System returned to ROM by power-on
System restarted at 19:44:45 pst Thu Aug 10 2017
System image file is …
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BTU generated by a fully loaded HP 48-port POE switch - all attached devices are color LED screen telephones
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What's to prevent someone from spanning ports on say a Cisco switch and capturing NSX SDN traffic and recreating the traffic it discovers? How is the NSX traffic kept secure from the L2/L3 switches it rides on?

Thanks.
0

Switches / Hubs

20K

Solutions

17K

Contributors

A switch is a device that filters and forwards packets of data between LAN segments. Switches operate at the data link layer or the network layer of the Open Systems Interconnection (OSI) Reference Model and therefore support any packet protocol. LANs that use switches to join segments are called switched LANs or, in the case of Ethernet networks, switched Ethernet LANs. A hub is a connection point for devices in a network. Hubs are commonly used to connect segments of a LAN. A hub contains multiple ports; when a packet arrives at one port, it is copied to the other ports so that all segments of the LAN can see all packets.