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Switches / Hubs

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Solutions

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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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Question.  Our new office prewired with CAT6a all the way.  From users stations to the patch panels.
Does it make sense to have CAT6a for the users stations as well?  Desk ports to the computers.
And from patch panels to the switches.  
What about from other devices to the switches?  WAPs, FW, routers, between switches, etc.  Go with CAT6a all the way?
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What does it mean when you call a number and the operator tells you to "switch 189-101"?
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I have a 48 port HP office connect 1920 switch.  I am trying to learn some switch config and want to purchase a low price HP switch that I could connect up and go through a configuration.  If I have little knowledge on how to do this would I be able to look through the settings on the 1920 and duplicate them or would I need some outside IT assistance?  Also, any ideas on if there is a low price switch that HP sells that would work for this?  I would only need an 8 port.
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Dear Experts.

I have two HPE 1950 Series switches.
Both seitches are 12XGE + 4 SFP+.

I used 2 SFP+ ports on each to create an IRF between them which works great.

Here's my question, using the CLI rather than the Web Interface, is it possible to change the settings on several non-consecutive ports?

I know that there's the following command:
interface range Ten-Gigabitethernet 1/0/1 to Ten-Gigabitethernet 1/0/10

Open in new window

Which will then allow me to provide the same settings to all ports from XGE 1/0/1 to XGE 1/0/10.
but what if I wanted to put the same settings on 1/0/5 and 2/0/5 ?
is there a way to do so?
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Hi,

I'm looking for some advise on my network up-link configuration.

I have single Cisco 6500 series acting as a core/distribution switch in my network. Its Equipped dual Supervisors and multiple 1gig line cards.

My access switches are primarily Cisco 2900 Series in a stacked configuration.  Each switch stack has 2 up-links back to the 6500 Core and i am curious what is the best approach to configuring these up-links is ?

should i port-group these trunk links and create a cross-stack Etherchannel ? does this have any implications / downsides ?
or should i simply leave them as independent up-links and allow Spanning-Tree to control them.
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Hi Guys

I'm looking to add in some static routes on my 2 core switches (both S4810's) which I've inherited.  I've got some existing routes which I need to mimic so I'm just looking for confirmation that I'm about to do it correctly.  Here is the entry(ies) id like to mimic on my system when I run sh ip route:-

  S    192.168.61.0/24    via 192.168.60.250, Vl 60            1/0        5w4d
  S    192.168.62.0/24    via 192.168.60.250, Vl 60            1/0        5w4d
  S    192.168.63.0/24    via 192.168.60.250, Vl 60            1/0        5w4d
  S    192.168.64.0/24    via 192.168.60.250, Vl 60            1/0        5w4d

So you can see I have multiple for a number of subnets which I need to go out of to a particular Vlan interface

I need to do the same with another subnet, lets say 192.168.1.0/24 out of the same Vlan interface

Im thinking of running the following in conf mode:-

ip route 192.168.1.0/24 vlan 60 permanent

Is this as simple as it looks?  Does this look correct to everyone?

Thanks
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Is there a good tool (free is always preferred) that I can use to get a visual representation of my Switches (HP Procurve 2620), VLANS and tagging/ untagging? It is easier for me to process visuals as opposed to CLI.
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Hi,

We have an extreme 220 onsite and want to be able to manage it using SSH as well as set snmp for monitoring using Auvik. we thought it was all good as Auvik can log into the switch however we cannot get it to recognize the switch via snmp and when we try and log into the switch via ssh we cannot. We are able to telnet in though.

after looking around we havn't found any super clear instructions for setting ssh and snmp on this switch using the gui.

Looking forward to some guidance,

Thanks
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Hey Experts, we have a Digium Switchvox VoIP Server. This past weekend our local power company had to upgrade our facilities power. We gracefully shut down everything Friday night, power was restored yesterday afternoon. This morning we have half of our phones not working as they cannot get an IP now. Our LAN and VoIP LAN are attached to our SonicWALL NSA2600, we have 3 Cisco SG500-28-p Stacked switches. What we have found so far is that any phone connected to the Master switch will not get an IP for the phone. Each desk has 1 Ethernet drop, that goes into the phone and the workstation plugs into the phone. The workstations all work fine to phones that don't work. We have rebooted the switches for good measure and nothing changes. Hoping someone can help shed some light on what the problem is.

Here is how the config on the sonicwall looks for the interfaces
Interfaces on SonicWALL NSA2600
Here is the Stack.
SG500-28P Stack
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Hi there, am looking for some assistance on an issue i cannot figure out
We have a Juniper SRX210 which i have configured a new interface on and connected a managed switch to this interface
The switch has an IP in the same range as this new interface
I can ping the new interface of the Juniper IP from the LAN interface but i cannot ping or browse to the new switch
There is no security zones setup and this works on another site in this format with the same model Juniper
I didnt set this up and have no experience with Juniper so any assistance grateful!
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Hello,

We have a single catalyst 4500 in our datacenter. It's a WS-C4507R+E with an ipbase license. It has
2x48 10/100/1000BaseT Premium POE blades,
2x4 Supervisor 10GE (SFP+), 1000BaseX (SFP) blades in active & standby hot,
1x12 1000BaseX (SFP) blade and
1x12 10GE (SFP+) blade.

In the interest of replacing this EOL switch, I am looking for a replacement which will last 10-15 years which can easily handle this environment with the possibility of growth and scalability to accommodate modern servers coming with 10GE NICs. I'm also interested in having it in HA mode.

We also have 2960S in stacked an unstacked modes connected to this 4500 via fiber. What can be a good replacement for them also?

Thank you.
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I need to update a bunch of catalyst switches from TLSv1.1 to TLSv1.2. Also need to disable older ciphers. Has anyone implemented this before?

Please share the steps as I can't seem to find anything documentation online for this.

Thank you.
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We have a c3750-48PS the switch works fine on the computers, but the Access Point doesn't come up, it lights up, but it doesn't see the Wireless Controller. The Access Point is a 2802I.

Any ideas?
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Hey guys,
We have just acquired a client that uses Cisco stuff.  I am looking at the show run file for one of their devices.  I see non default vlans added to the ports, but I don't see any list of vlans.  Somewhere at the top of the file I see, "vlan internal allocation policy."  The stuff that I am reading about it is confusing, but it seems that what this is doing is importing vlans from another device.  Is this correct?
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We had a new 4500x switch that was a boob (bad out of box).  It had and enterprise license however when Cisco replaced they gave us a unit with only IPBASE.  We have obtained the license file and thought there was a way to just copy and past or do CLI activation instead of having to upload the file.  Can this be done in lieu of upload?
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Hi Guys,

Last week I tried to upgrade our edge 3750X switch (two switches in a stack), from c3750e-universalk9-mz.152-2.E.bin to c3750e-universalk9-mz.152-4.E5.bin.

Previously I copied the new IOS to both flash: and flash2: from TFTP, ran command 'boot system switch all flash:c3750e-universalk9-mz.152-4.E5.bin, and then 'wr mem'.

Later I consoled into the master switch and reloaded. The master switch booted into the new image successfully, but the member switch got stuck in a booting loop. The new IOS was loading, and went nearly to the end, and the master switch could see the member at some point. Then the process started all over again, and it was endless!

I tried powering the member switch off, and then on again - still the same. Tried removing stacking cables, and restarting - still no joy. Then booted the member into SWITCH: prompt, and then into the previous IOS - still a loop! I didn't know what else I could try, so at the end I powered the offending switch off and left it as it was (as the master switch was providing all the services).

Please could you advise how to resolve this issue? Any advice would be appreciated.

Regards,

Lucia
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Hi,

I´ve  lansweeper software and  RouterOS CRS125-24G-1S Mikrotik devices.

When I try to run SNMP  discover task,  lansweeper software can not see what MAC is connected to each port.  With HP or Cisco switches there is no problem.

Any ideas? I opened a ticket to Mikrotik support and no info about this problem.

Regards
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Trying to replace 3650 with a 3750 g. I have concerns over the IOS version and multi cast, I am concerned about some of the IOS commands not supported in the 3750.

Trying to understand the differences between 3750g running ios  Cisco IOS Software, C3750 Software (C3750-IPBASEK9-M), Version 12.2(55)SE4, RELEASE SOFTWARE (fc1)

and

WS-C3650-24TD running cisco IOS Software, IOS-XE Software, Catalyst L3 Switch Software (CAT3K_CAA-UNIVERSALK9-M), Version 03.03.05SE RELEASE SOFTWARE (fc1)

There are differences with VRF and IP dense mode

Any insight would be helpful.
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Hi,

I have a SmartThings Motion sensor and a SmartThings Power Outlet.

I set these devices up so that when I would walk into a room, the sensor would sense my movement and turn on the Outlet.

However, if I do not have my internet for these devices, the Outlet will not be turned on.

I have seen devices such as sensor lights but was wondering if such things existed for a socket where WiFi was not needed.

Can you recommend any sensor sockets that work like these devices but do not require WiFi?

Thanks,
Robbie
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need to build network for 43 CCTV, 200 data, 200 IP telephone and 84 WIFI for hotel
kindly provide me the suitable part number for the active component as below
24      access switch 24 x GigE, 4 x 1G SFP POE      
2      core switch main and redundant fiber optic interface      
1      WIFI controller server      
84      access point      
1      Firewall
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What is the best option for a router or managed switch for a new fiber connection we have coming into our building?

Any recommendations other than a Cisco switch?

Basically we have a tail coming in with 50/50 fiber and 2 ip’s and 2 businesses need to leverage off it, our business and another.

Both businesses are separate but contributing to the connection and aside from QoS just need something to be able to push 1 internet ip to 1 lan and 1 ip to another.

Was assuming a managed switch or router with a vlan switch to 1 port and a vlan to another. Each business will have their own router and firewall from that point

No data can cross.

So was just looking for the best option and what unit would be reasonable whether a router or switch and just setup vlans

Any assistance greatly appreciated.
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I work in a corporate environment and recently we ran into some issues that raised some questions.

We are a huge international company with millions of end point devices. We are tiered with the central office controlling satellite offices and then the satellites feed the local sites of 250+ devices. We recently had a failure of the main offices double-failover which caused most satellites to have failover failures as well.

I had noticed for the past few months that the end points were behaving erratically, startup signal without any signal issued which I suspected was software corruption or bad cables both are recurring nightmares.

The main question, is it possible for nexus and catalyst devices to store and forward and fail to erase the successfully transmitted packets and days later on a 80% utilized gigabit network start to retransmit those packets. The switches are old and most have flash failures and have to be chain loaded when started up.

I did notice after the site restart that the endpoints worked as designed. I also heard that the switches were out of memory during the network outage and the voip phones worked with some issues during the outage.
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Dear Experts, we have this diagrams:

Internet ------ Router ------- Core Switch -------- Catalyst switch 500 ------- users

We suffered the slow Internet problem from yesterday, and from the Catalyst log, we saw these things:

1.JPG
On the Core switch at that time, the "show processes cpu" show 20% where as normally it is just 8-10%, nothing special in the Router. So can you please suggest? Is it a DoS attack? How can we avoid it on Core switch Cisco 3560?
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Hi, we have DHCP snooping enabled, and ASA doing DHCP-Relay. Between 2960-L and ASA is another switch doing snooping.

Anyway we have this 2960-L as access switch trunked at 4500. When not using dhcp snooping on access, all is working fine.
DHCP-Discover, DHCP-Offer from DHCP Server and PXE-Server, DHCP-Request from Client to PXE-Server for more information regarding PXE and the DHCP-ACK from PXE-Server with all the needed information(boot file name).

however when using ip dhcp snooping on 2960-L, the important last DHCP-ACK packets from the PXE-Server are not showing up at the client interface anymore. so the Client misses the PXE-boot important information for tftp, times out and does a DHCP-Release to restart the operation...

As i said, all is working fine with only disabling dhcp snooping on access switch.
IOS already changed from 15.2-5 to 15.2-6
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we have a procurve 1800-24g networking switch. there are 5 vlans set on it. each port has vlan aware enabled checkbox, ingress filtering enabled check box, packet type selection and PVID selections.
when i try to set a port on it to connect to another switch, according to help,
Switches should be connected to each other with Packet Type set to Tagged and PVID set to "None."
when i set the port this way it does not work.
the only way i can get it to work correctly is set the port as member to all of the vlans, make it vlan aware enabled, packet type to all, pvid to 1.

what is the correct way to do this please?
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Switches / Hubs

21K

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.