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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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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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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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1 Comment
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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1 Comment
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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34 Comments
BTU generated by a fully loaded HP 48-port POE switch - all attached devices are color LED screen telephones
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1 Comment
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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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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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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11 Comments
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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0 Comments
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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15 Comments
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how to config  hybrid on HPE  for 2 Vlan voice & data
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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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1 Comment
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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4 Comments
Dear Team, we are purchasing some devices but not sure how to build it. Do you have any guide? or can you please suggest the network diagram?
- 4 x Server HPE Gen9
- 2 x SAN switch
- 1 x SAN storage
- 20 x Patch cord LC-LC
- 1 x HDD Storage

Many thanks as always!
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2 Comments
juniper switch EX 3300.
I gone through the docs but it's doesn't work me.
My requirements I need to setup static IP and 3 vlans
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2 Comments
I have multiple Cisco switches, from 2960's to 3750's.  I have them all configured via SSH, and randomly, after a few weeks, I can't connect via SSH anymore into them.  I use PRTG to monitor them, and I noticed that when something happens to the certificate, that's when I can't log in anymore, so my monitoring system displays an error for the cert.  When configuring SSH, does the default cert expire after a certain amount of time or something?

Any ideas how to fix this?
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10 Comments
Hi guys,

We currently have a 6 switch stack (SG500's) and we are moving to another building that will require us to increase our switch size to 9.  We are aware that only 8 SG500's are available per stack so I was wondering what the optimal switch setup should be.  Do we need to buy a core switch to maintain performance?

Thanks in advance.
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3 Comments
Hi

With this config from POE switch s5500 connected to core S5120 i got the phone working but i could connect or ping the S5500 ip address switch ... What's wrong !!

Is it the write config for a voice vlan setup like this (Core switch + poe) phone-pc connection !!

------------------------------------------------------------

Port connected from S5500  to core  S5120 port 10

interface GigabitEthernet1/0/48
 port link-mode bridge
 port link-type hybrid
 port hybrid vlan 210 tagged
 port hybrid vlan 1 untagged

--------------------------------------------------------------------

Phone port on S5500

interface GigabitEthernet1/0/19
 port link-mode bridge
 port link-type hybrid
 undo port hybrid vlan 1
 port hybrid vlan 210 tagged
 poe enable

---------------------------------------------------

Port on core switch S5120 connected to S5500 on  port 48

#                              
interface GigabitEthernet1/0/10
 port link-type hybrid          
 port hybrid vlan 210 tagged    
 port hybrid vlan 1 untagged    
 undo voice vlan mode auto      
 qos priority 6
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Can you configure a routed interface to use both the global and VRF routing table?
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1 Comment
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Hello Experts,

I want to segment my wireless network traffic into Guest, student and teacher.We have sonicwall, multiple switches and Access point.

I dont want filtering on computers those are connected through ethernet. i just want to segment my wireless network and assign them to Iboss security device for content filtering .

Any suggestions???

Thanks
Nakul
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16 Comments
I have 2 Mikrotik switches that connected via 2 port to router.
2 uplink port is bridge,because they are using 1 subnets.
 i found that Mikrotik switches works:
1-all interface use 1 master port
or
2-all interface in 1bridge.
switches clients did not ping other often.always restart the switch solution of problem and i guess because of switching mechanism in Mikrotik.
Can i help me find problem correctly?
Mikrotik.PNG
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0 Comments
Dear Team, we have several Catalyst 500 acting as Access switches for users, printers, Finger prints (FP) and Access points.

Here is a problem: 2 FingerPrints -----------------------90 m---------------------------- A small switch (LinkSys)  ----------20 m----------- Catalyst 500

In Catalyst 500, there are few modes for port operations; such as Switch, Router, Access Point, PC, Printer,... When I configure a port (which connected to a small switch) in Switch mode, I cannot ping those 2 FPs, but when I set that port to Access Point or Router mode, I can ping them.

Besides, it only works for few hours before disconnected (request time out). I have to reboot FPs to ping them again.

Can you please explain?
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2 Comments
I have cisco 3650-48fq-s with 4 TenGigabitEthernet sfp ports trying to connect to at&t 1gig ase circuit but link not coming up.

Here is the config on the port:
Interface TenGigabitEthernet 1/1/4
Switchport trunk allowed vlan 110
Switchport mode trunk
Speed nonegotiate


Then I tried on cisco 2960-XR with 1gig sfp port on it and it worked.

I have 4500 series cisco L3 switch at another location with TenGig sfp port on it with same above config and works there.
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16 Comments
hey ,

the port that has the sfp SR does not come up , i have tried to do a shutdown no shodwon and still does not come , when i do shutdown command the port does not go for orange color .


i am confused !

BR
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2 Comments
Hello experts,

I have an old 3COM 4500 switch (3CR17561 91) and I need to set up QOS to give one machine in my network preference over the internet, including browsing and downloads.

I have access to the web admin page and I don't know how to configure the ACL to this purpose. I need the IP 192.168.10.182 to have full precedence over other connections to the internet. He is connected to port 20.

Here is a print from the configuration page:
Capturar.PNG
I read a lot of info here about people with this same problem and using command line, but if you could help me with this web interface I would appreciate.

Regards.
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0 Comments

Switches / Hubs

20K

Solutions

7

Content

i
The collection of articles, videos, and posts on this topic.

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.

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