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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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Hi all,

I have had a strange problem with the HP 5500 Switches we use in our network infrastructure.

At seemingly random time and locations, some of the HP 5500 switches stop propagating the VLAN 10 across the network. There are other VLANs configured on the switch, but all of them function as intended. The present set-up routes all the VLANs through the router provided by the service provider. The switches are still accessible via VTY, and there seems to be nothing in the logs to indicate why such an incident could occur. And as strange the problem is, a simple reboot of the switch seems to resolve the issue.

Here is how the port is configured:
interface GigabitEthernet1/0/23
 port link-mode bridge
 port link-type trunk
 undo port trunk permit vlan 1
 port trunk permit vlan 2 to 3 10 15 30 67 70 100
 speed 100
 duplex full
 stp edged-port enable

Thanks in advance,
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The ATEN VM0404HA 4x4 4K HDMI Matrix Switch supports 4K resolutions of UHD (3840 x 2160) and DCI (4096 x 2160) with refresh rates of 30 Hz (4:4:4) and 60 Hz (4:2:0). It is ideal for applications where the routing of 4K digital signals is required.

we are using aruba 2530 48-g switch from last 2months but suddenly we are getting Fault led blinking.and network is working properly.
0
Have an unbalanced power supplies error for 3850 power stack. Cisco tech is recommending the following steps

-Leave power stack and rejoin monitor logs
stack-power switch 4
standalone
no standalone

How exactly is this accomplished?
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I'm looking to configure my ZL2 and associated HP switches to emulate this article with a vlan I have configured on these switches. I'll warn you that I understand networks but when it comes to config, especially CLI, I am a bit lost.  Some help would be appreciated.


http://www.yamahaproaudio.com/global/en/training_support/selftraining/dante_guide/chapter3/04_qos/
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We have a Meraki MX400 firewall, and 11 SG500-52P Switches we are using for Access.  I'd like to get something for Core or Aggregation, what kind of product do you recommend?  Would we benefit from having a 3850 or something along the those lines to serve as the distribution or L3 switch?  Should we create stacks for the 11 SG500-52Ps?

Thank you in advance.

Nico
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Hi I am not able to connect Nortel switch 5650TD model through putty .
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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 folks

i am wondering if anyone ever used Cisco WRVS4400N's port mirroring feature to monitor traffic of a given port?

i have tried any individual port or even all ports together as the source, but i still cannot see any mirrored traffic from listening to the specific port (Port 4), as shown below.

Screen-Shot-2017-09-13-at-13.29.04.png
i have no idea why the device doesn't work as expected. do you have any suggestion please?

regards,
bbao
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I am trying to connect two Cisco switches, a 3550 switch to a port on the 4503. I have my 3350 port 0/2 connected to my 4503 on the blade  3/25 port.

I have both ports on both switch configured as follows:

switchport trunk encapsulation dot1q
 switchport mode trunk

both ports are enabled but I am not getting any link lights between the two ports.  I have tried standard and crossover cables.  I am sure I am missing something simple.  We are not running multiple vlans, just default.  Any help would be appreciated.


John
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Hello everyone!. I was wondering if anyone could help me with this. At the office, it is the second time the whole network stop working because of external causes. The first time somebody connected a patch core from one wall socket to another and everything collapsed....it took me some hours to realized what was happening...The last time, cleaning personal accidentally moved a switch connected to wall socket and because of it almost all packets were lost, again it took me some time to find it out...
Is there any recommendation or advice in order to prevent future problems like this?. I have dlink switches.

Thanks in advance
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New feature! Upgrade and increase expert visibility of your issues with Priority Questions.

Hello,

I try to configure mutiple vlans on my switch HP 2620, with windows 2008 r2

Windows Server - IP 10.0.97.1 (AD, DHCP, DNS, is the secondary domain, sync over VPN)
Router Draytek - IP 10.0.97.254  (with vpn lan to lan, to another office)


VLAN97 SERVERS - 10.0.97.2 - 10.0.97.253
VLAN98 USERS     -  10.0.98.1  -10.0.98.254
VLAN 99 CCTV      -  10.0.99.1  - 10.0.99.254
VLAN GUEST        -   10.0.100.1 - 10.0.100.254 (Only internet acess)

Subnet in Router:
10.0.98.0 255.255.255.0 next-hop 10.0.97.2
10.0.99.0 255.255.255.0 next-hop 10.0.97.2
10.0.100.0 255.255.255.0 next-hop 10.0.97.2

Config:

hostname "SW-2620"
console idle-timeout 300
console idle-timeout serial-usb 300
max-vlans 30
timesync sntp
sntp unicast
sntp server priority 1 10.0.97.1
time timezone 60
ip route 0.0.0.0 0.0.0.0 10.0.97.254
ip routing
snmp-server contact "Dep. IT" location "office2"
vlan 1
      name "VLAN1 - DEFAULT_VLAN"
      no untagged 1-24
      tagged 25-28
      no ip address
      exit
vlan 97
      name "SERVERS"
      untagged 1-24
      tagged 25-28
      ip address 10.0.97.2 255.255.255.0
      ip igmp
      exit
vlan 98
      name "Users"
      tagged 25-28
      ip address 10.0.98.2 255.255.255.0
      ip helper-address 10.0.97.2
      ip igmp
      exit
vlan 99
      name "CCTV"
      tagged 25-28
      ip address 10.0.99.2 255.255.255.0
      ip helper-address 10.0.97.2
      ip igmp
      exit
vlan 100
      name "Guests"
      tagged 25-28
      ip address 10.0.100.2 255.255.255.0
      ip helper-address 10.0.97.2
      ip igmp
      exit
spanning-tree
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We currently have a Palo Alto firewall with 3 ports configured. One for LAN, one for WAN, and one for the DMZ. I have a standalone netgear switch connected to the DMZ port with the relevant servers connected to that. On the LAN port I have a mix of 5 switches - 2 older HP devices, 2 3 Coms, and a Netgear.

I have 5 new Aruba 2920 switches that I am replacing the older equipment with. I thought I could also eliminate the netgear switch on the DMZ by running VLANS on the new Aruba stack.

Our current setup (with different IP's):
10.100.2.0/24 - Local LAN
10.100.1.0/24 - Local LAN #2 (through MPLS)
10.100.4.0/24 - Local LAN #3 (through MPLS)
10.100.50.0/24 - DMZ

Firewalls/Switches:
10.100.2.5 - Palo Alto LAN port
10.100.2.19 - Aruba Switch
10.100.50.1 - Palo Alto DMZ port

On the first switch I set  VLAN 2 to the 10.100.2.x subnet, and VLAN 50 for the 10.100.50.x subnet. I set ports 3-30 untagged on VLAN 2 and ports 31-44 untagged on VLAN 50. I tagged port 1 for VLAN 2 and have that port currently connected to the older switches (I am not stacking the other 4 switches and replacing the older equipment until I have this working correctly) and that is connected and working as far as I can tell. I set port 2 tagged to VLAN 50 and connected it to the DMZ netgear router. I did enable routing as it seemed I needed it.

vlan 2
   name "VLAN 2"
   no untagged 1/31-1/44
   untagged 1/1,1/3-1/30,1/45-1/48
   tagged 1/2
   ip address 10.100.2.19 255.255.255.0
   …
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I am trying to add a non cisco SFP between two catalysts, and am getting the error %PHY-4-SFP_NOT_SUPPORTED: The SFP in (PortNo#) is not Supported.

I have tried running the commands:

Switch(config)#service internal
Switch(config)#no errdisable detect cause gbic-invalid
Switch(config)#service unsupported-transceiver
Switch(config)#int gi0/49
Switch(config-if)#no shutdown
Switch(config-if)#do copy run start

However, the issue is still occurring. I have rebooted the switch after the above with no joy. Cable being used is a StarTech 3m SFP+ 10-Gigabit Ethernet (10Gbe) Twinax Cable. I will be upgrading the firmware to 15.2.6 while waiting for a reply.

Any help will be appreciated.

Switch Ports Model                     SW Version            SW Image            
------ ----- -----                     ----------            ----------          
*    1 50    WS-C2960X-48TS-LL         15.2(2)E6             C2960X-UNIVERSALK9-M
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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
0
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 am trying to see what the best way to assign vlans to my subnets. The below is what I was planning for with the 3rd octet as the vlan#:
- vlan 8 - 10.10.8.0/22 (10.10.8.1 - 10.10.11.254)
- vlan 18 - 10.10.12.0/22 (10.10.12.1 - 10.10.15.254)

But now we are breaking 10.10.8.0/22 to the below. Any tips on assigning the vlan #?
vlan8 - 10.10.8.0/28
vlan? - 10.10.8.16/28
vlan? - 10.10.8.32/27
vlan? - 10.10.8.64/26
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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
0
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LVL 10
Important Lessons on Recovering from Petya

In their most recent webinar, Skyport Systems explores ways to isolate and protect critical databases to keep the core of your company safe from harm.

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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Hi guys,

i am new to networking, we have a requirement where we need to design a network for a small office,
there are 15 users with ip(cisco)  telephony  headsets.

Please suggest me which Cisco router(small bussiness) with part number is suitable for the requirement.
0
So I have always used Cisco with 10GbE stack cable's where you stack each switch to the one below and the last to the first so if an individual switch goes down the rest of the stack stays up.

I am now looking at a Meraki setup where we have a small stack on several floors going back to two switches that have the external connections. 1Gb is fine here, I don't need the 10Gb as this is just for desktops not servers.

The two switches have SFP to the first in each switch stack, the first switch then has a copper uplink to the other switches. This seems odd to me.

I would have thought that I should copper all the switch stacks from first to last and then the last in the stack copper to the next switch stack. That way all stacks have the SFP for normal operation but can fail to copper to the next switch I the stack up or down and the stack can fail across to the next stack if the SFP switch goes down.
0
Hi

I'm setting up a Huawei layer 2 switch Monday morning. Haven't done one of these before. I'm familiar with HP and Cisco. Could some one assist with some cli commands.

I need a few vlans configured and a trunk port from the firewall.

Thanks
0
hi
i had a question , can a port in the switch be a part of both access and trunk ?  

what is native v-lan can any one explain ?
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.