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 am new to VLANs, I have a single CISCO SG300-10.  How do I configure 3 VLAN to create 3 separate networks which can communicate on the 1 SG300-10 switch. Would be nice to provide internet access.  I cannot tell step by step how to do this.  I have read the posts, but none match up pt for pt with SG300-10 interface. Not sure whether to use General or Trunk, Tag or Untagged.   Help
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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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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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Hi All,

I am having problems loading OS image onto a new Nexus 9504 with 2 sup below are the steps i have tried, any advise would be much appreciated. image i am using is nxos.7.0.3.I5.2.bin

1. Reload switch and
2. Ctrl + C
3. cmdline recoverymode=1 and cmdline init_system
4. boot nxos.7.0.3.I5.2.bin (which is copied on bootflash/)
5. After this it starts configs and took some time but displayed other messages: System is coming up ... Please wait ...
6.After this, it returns to bash shell: bash-4.2# and nothing happens
7. Both switches, I have reloaded twice and retied again; but still same.

when i exit it takes me into (standby) login: but requires username and password which i have tried all the defaults and will not let me in.

Thanks
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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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Hi All,

We got Linksys LGS552p switch, and TZ400 Firewall.
behind a "AT&T Modem"  , but we have external IP for the TZ 400.

I need to setup VLANS, 90 for workstations, 20 or servers and 50 for voice.

am I missing any hardware to route between the VLANS?
where should I start with first?


thanks
Jason
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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.
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Hi all,

I have purchased a pair of HPE FlexFabric 5700 40XG switches. In the past I have used Cisco SG series switches so I am new to HPE equipment. Is there a gui for the HPE FlexFabric 5700 40XG switches?
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Dear Experts,

i am looking for a converter with takes 10 gig fibre as input and gives output for RJ45 10 gig. are they available?

if yes can you please send me link to buy online.

i can find on ebay from ethernet to fibre, but i need reverse.

Thanks
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Hi ALL

i have done the configuration in HP aruba 2420 switch ,same configuration needs to be in juniper EX3300 switch,

Kindly find the below HP Switch Aruba commands,

#hostname hp-switch1
#vlan 10 ip address 192.168.0.35 255.255.255.0
#vlan 10 tagged A1 ( i need to tag port also fine )
#vlan 20 tagged A1 ( i need to tag port also fine )
#vlan 150 tagged A1 ( i need to tag port also fine )
#vlan 10 untagged 1-46
#vlan 20 untagged 47-48
#timesync sntp
#sntp unicast
#sntp server priority 1 192.168.0.10
#time timezone 330
#ip default-gateway 192.168.0.1
#snmp-server contact Bang-Systems location 9th-floor
#vlan 1
#no ip address
#vlan 10
#name sales
#vlan 60
#name cop
#exit

#no telnet-server
#no password operator
#password manager plaintext ********
#encrypt-credentials

#radius-server host 192.168.0.120 key root123
#radius-server key root123
#aaa authentication login privilege-mode
#aaa authentication console enable radius local
#aaa authentication telnet login radius local
#aaa authentication web login radius local
#aaa authentication ssh login radius local
#aaa authentication ssh enable radius local
#aaa authentication port-access chap-radius
#aaa port-access gvrp-vlans
#aaa port-access mac-based addr-format multi-dash
#aaa port-access mac-based 1-46

#logging 192.168.11.122
#snmpv3 enable
# # Give password 123456
# # type "n" for user creation
# # type "y" for restricted access
#snmpv3 user snmpv3user auth sha EPe3XjeQh3F5…
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I have two Windows 2012 R2 servers with internal static 192.168.20.x IPs and want to be able to place a switch between them so they can PING to each other, allowing me to plug my static Windows 10 Pro 192.168.20.x IP laptop into the switch so it can also PING these servers

 1. Do I need a managed switch with a static IP in the same 192.168.20.x range and have the switch act as the  192.168.20.1 Gateway ?
 2. If not, what unmanaged switch do you recommend since I was thinking I needed a switch to act as my gateway ?
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Hello IT Pros.

I'm new to Ubiquiti, and wondering if someone here has experience setting up a network using Ubiquiti hardware?
Nothing has been implemented so far.

Any leads will be fully appreciated.

The idea that we want to implement
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Not sure what' i'm doing wrong here as I've done this countless times on older versions.  Have new 2960-x running 15.2,  wanting to use ethernet 1/0/48 as my trunk.   so i do this

switchport mode trunk
switchport trunk allowed vlan 10,19,20,30

but when i sh vlan, none of the vlans show associated with port
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I have multiple cisco switches, from 2960 to 3750, and we are using voip phones that use the same ports as the computers.
So I'm thinking to to leave the computers on the default vlan, which is vlan 1, and have the voip phones on vlan 200 or some other vlan.  As far as I know, to have each port in two separate vlans, I would have to make all ports trunk ports, is there a better or another way than doing that?
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Hi Wizards, I am just wondering about this issue? Can we specify the cost of commands in terms of consuming resource (CPU, RAM) in Cisco devices, such as Routers, Switches?

Many thanks in advance!
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I need to enable spanning tree on all of our WAN switches and designate our edge switch as root. However, the same switches have several ports that extend into school district LANS, causing issues with my current STP config.

Eample: port 1 connects to our WAN, ports 19-24 connect to their LAN. What would be the proper configuration in this case?

All schools have ProCurve 3500YL switches.
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how to config  hybrid on HPE  for 2 Vlan voice & data
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I'm looking online to buy some SFP's for my cisco 3750G and 2960G swithces, does anyone know if these will work?

http://www.prolabs.com/products/datasheets/brocade/E1MG-TX-C.pdf
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Which configuration would be correct?

Switchport: Enabled
Administrative Mode: static access
Operational Mode: static access
Administrative Trunking Encapsulation: dot1q
Operational Trunking Encapsulation: native
Negotiation of Trunking: Off
Access Mode VLAN: 5 (5-MLF-BRA-CORPORATE)
Trunking Native Mode VLAN: 5 (5-MLF-BRA-CORPORATE)
Administrative Native VLAN tagging: enabled
Voice VLAN: none
Administrative private-vlan host-association: none
Administrative private-vlan mapping: none
Administrative private-vlan trunk native VLAN: none
Administrative private-vlan trunk Native VLAN tagging: enabled
Administrative private-vlan trunk encapsulation: dot1q
Administrative private-vlan trunk normal VLANs: none
Administrative private-vlan trunk associations: none
Administrative private-vlan trunk mappings: none
Operational private-vlan: none
Trunking VLANs Enabled: 5,10
Pruning VLANs Enabled: 2-1001
Capture Mode Disabled

or


Switchport: Enabled
Administrative Mode: static access
Operational Mode: static access
Administrative Trunking Encapsulation: dot1q
Negotiation of Trunking: Off
Access Mode VLAN: 5 (5-MLF-BRA-CORPORATE)
Trunking Native Mode VLAN: 1 (default)
Administrative Native VLAN tagging: enabled
Voice VLAN: none
Administrative private-vlan host-association: none
Administrative private-vlan mapping: none
Administrative private-vlan trunk native VLAN: none
Administrative private-vlan trunk Native VLAN tagging: enabled
Administrative …
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Hi experts,
i need some advice. i have about 50 pc's on our company network with 1 file server that these pc's access for AD,DNS, DHCP and our financial application(uses access database). we currently have a 48 port 10/100 switch with 2 gigabit uplink ports as the backbone and then 2 gigabit switches connect to this backbone switch. i was aiming to replace the 10/100mb backbone switch with a full gigabit switch but budget is a problem at the moment. would the following work as a temporary solution for about 3 months: I will install a very entry level 8 port dlink gigabit unmanaged network switch as the backbone, connect my server and links to other switches to this 8 port switch. so from the 8 port switch i will connect all 4 network cards on my server to this switch as well as the link cables from my 3 larger switches. I know this is not the best solution but i just need something that will do the job for a few months? or would this small 8 port switch take too much strain?
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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.