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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.

hi guys

I need to install an appliance which will look at all of the network traffic on our network. As there are multiple VLAN's and networks, I need them all to be mirrored to just one port.

Are you able to help me with how to do that?


Thanks for helping
Yash
0
stacking 2 3850-24XS-S switches

I found documentation online in how to stack 3 or more switches, of the 3850's, but not with only 2 switches.
Do I only use 1 stacking cable, or do I use 2 stacking cables for a stack of 2 switches?  Basically, would it be left (switch 1) to right (switch 2)  and right (switch 1) to left (switch 2)?
0
how to disable lacp on port (f.x) 21 on procurve 2810 from command line
0
I am attempting to configure VOIP multicast paging for a member school district. Currently, when a phone page is initiated, the green speaker light on the phone comes on and the mic red (mute) light comes on at same time.However, the page is not able to be heard on any phones. I am told this did work at one time but no one seems to be clear when it stopped working. As of yesterday, I upgraded their WAN switch and I am attempting to get the paging to work again.

Specifics.

Cisco Informacast server (Handles paging) is located on the WAN and is directly connected to a  vlan 110 port (near-end)
VOIP phones are located at the district on the far end of our WAN (far-end)

Near end switch connected to Informacast server on vlan 110:
HP 5412R , J9851A running KB.15.17.0007

Far end switch hands all vlan 110 VOIP traffic off to VLAN 72 (Phones):
Aruba 3810M, JL071A running KB.16.07.0003

Vlan 110 is configured on both switches and vlan 72 is only configured on the far end.


Obviously, the config is non-working (copied over from old switch) and has been modified in an attempt to resolve the issue but I will post for reference and advice on what to change.

near end switch vlan 110 config:
vlan 110
name "VLAN110"
untagged A3,B5-B6
tagged
A4-A9,A11-A19,A21-A22,A24,B1,B4,B7-B8,B13-B22,C1-C24,D1-D24,E1-E24,F1-F22
ip address 10.201.0.1 255.255.248.0
ip igmp
ip igmp forward A1,A3-A24,B1-B2,B4-B8,B10,B12-B22,C1-C24,D1-D24,E1-E24,F1-F22
qos priority 7
forbid B2
0
Hi Anyone can help to resolve the problem? I want to connect a switch 3560 to switch 4508. After configring the two port as trunk, the 3560 is always up and down, and i got the below info from 3560. i changed cables several times, but it cannot work. Thank you



00:51:40: %ILPOWER-7-DETECT: Interface Gi0/2: Power Device detected: IEEE PD
00:51:41: %ILPOWER-5-IEEE_DISCONNECT: Interface Gi0/2: PD removed
00:51:45: %ILPOWER-7-DETECT: Interface Gi0/2: Power Device detected: IEEE PD
00:51:45: %LINK-3-UPDOWN: Interface GigabitEthernet0/2, changed state to up
00:51:46: %ILPOWER-5-IEEE_DISCONNECT: Interface Gi0/2: PD removed
00:51:48: %LINK-3-UPDOWN: Interface GigabitEthernet0/2, changed state to down
00:51:51: %ILPOWER-7-DETECT: Interface Gi0/2: Power Device detected: IEEE PD
00:51:52: %ILPOWER-5-POWER_GRANTED: Interface Gi0/2: Power granted
00:51:53: %ILPOWER-5-IEEE_DISCONNECT: Interface Gi0/2: PD removed
00:51:55: %ILPOWER-7-DETECT: Interface Gi0/2: Power Device detected: IEEE PD
00:51:56: %ILPOWER-5-IEEE_DISCONNECT: Interface Gi0/2: PD removed
00:51:57: %ILPOWER-7-DETECT: Interface Gi0/2: Power Device detected: IEEE PD
00:51:58: %ILPOWER-5-IEEE_DISCONNECT: Interface Gi0/2: PD removed
0
Dear Experts,

Can anyone explain to me what this open caveat is talking about?

CSCvn42743      - 3850 dot1q tunnel outer tag is not poped
0
Good day,

Employees be logging in and using internet data.

How do I limit the usage ?

I current use uap pro as ap.
0
Configuring Cisco Switches

sw
I have the topology above...
both switches can see both routers mac addresses but cannot ping each other

R1#sh ip interface br | inc up
Ethernet0/0                192.168.12.1    YES manual up                    up  
R1#

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SW1#sh mac address-table
          Mac Address Table
-------------------------------------------

Vlan    Mac Address       Type        Ports
----    -----------       --------    -----
   1    aabb.cc00.0400    DYNAMIC     Et0/1
  10    aabb.cc00.0100    DYNAMIC     Et0/0
Total Mac Addresses for this criterion: 2
SW1#

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SW2#sh mac address-table
          Mac Address Table
-------------------------------------------

Vlan    Mac Address       Type        Ports
----    -----------       --------    -----
   1    aabb.cc00.0400    DYNAMIC     Et0/1
  10    aabb.cc00.0100    DYNAMIC     Et0/0
Total Mac Addresses for this criterion: 2

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R2#sh ip interface brief | inc up
Ethernet0/0                192.168.12.2    YES manual up                    up  
R2#

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R1#sh interfaces e0/0
Ethernet0/0 is up, line protocol is up
  Hardware is AmdP2, address is aabb.cc00.0100 (bia aabb.cc00.0100)

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R2#sh interfaces e0/0
Ethernet0/0 is up, line protocol is up
  Hardware is AmdP2, address is aabb.cc00.0400 (bia aabb.cc00.0400)

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But I still cannot ping between R1 and R2


R1#ping 192.168.12.2
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.12.2, timeout is 2 seconds:
.....
Success rate is 0 percent (0/5)
R1#

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0
Ive been researching refurbished Cisco Voice switches.  The pricing is compelling given the abilities within the equipment.  They could potentially solve a lot of problems.
The location where they will be used needs to be provided with a lot of uptime.  They are limited with budget.  The Cisco equipment is at or near end of life, but can be warranted still by Cisco.  the model numbers are the 3750X with full POE.  My research indicates they have static routes and more, but some of the queries I have seen shows that people have had problems with the same said static routes.  Does anyone have these, or used these in the past, or present. If so, is there any issue I need to be concerned with regarding Static routing.  I must have static rotes as there are about 8 subnets within the two campus settings that are to be ties together with MPLS.

If anyone has any Idea it would help immensely.  The issues is highly important as I must make the purchase today, but have this question.

Thank you
0
Hi
We have a big porta Cabin which is 100-120 meters away from the Main building.

Mail building core switch and porta cabin switch is connected through Fiber optics cable for data connectivity.

We have Wi-Fi in the mail building and Cisco POE switch connects all the access points in the main building and we have spare ports on the POE switch.

The approximate distance between the Main building POE switch and the Cabin is 100-120 meters.

Now staff are requesting Wi-Fi access in the porta Cabin and we need only two Wi-Fi access points.

Please suggest if I pull two UTP cable from Main building POE switch till the Porta Cabin access point. Will the Wi-Fi work in Porta cabin?

Please let me know the cheapest solution to set up Wi-Fi Access point in the porta cabin.  
Thanks
0
How to change Cisco Switch Default Password on this "WS-2960L-216PSLL  (15.2(7)E0a"

I am new in Cisco so how i can change the default password/username (cisco,cisco) on web gui or commandline? how it works.?
0
Hi guys

I've been tasked with being able to secure the network perimeter at various sites. One of the vulnerabilities I am seeing is that at the main offices, I could easily plug a device to a port and get an IP address assigned to me. Now, of course I can't access things on the domain without having credentials.

But one of the things I thought of was to perhaps lock down all ports on  network switches so that they are inactive (other than those already active for current staff) and only turned active when we know who wants to plug into the network and when? So that we can track it on some sort of sheet or portal?

We're talking each site consisting of around 250 people and there being over 5 to 7 sites.

How would you manage it?

Thanks for helping
Yash
0
I would like to update the comment on the very top of the CLI config:

"## last updated 12/07/18"

to the current date.

Can someone tell me how to do?
0
I am building a new stack of Cisco 2960X switches to replace an aging 2960 set. I have updated the software and tftp'd the image of the existing stack to the new switches. After recreating (required) VLANs I have compared/cross-checked the running config and it looks OK. The 2960X stack is curremntly in a lab environment and caonnected only to a support laptop (console + Ethermet access to swicthes)

However, when I try to ping the management IP (assigned to VLAN254) via the console connection (ie from the switch itself) it times out (tests good on original switches). I get the same result trying to ping the support laptop (configured on same subnet).

Also, I see in the VLAN brief that my trunk port on each switch is indicating as being assigned to VLAN1, this is not the case when compared to the original. All active interfaces are otherwise assigned to other VLANs'

I am reluctant to schedule replacement on the existing switch stack until I have and understanding of why I am unable to ping, and why the trunk ports are showing in VLAN1. I am not Cisco certified so would really appreciate some insight here.

Thanks!
0
HP Procurve 2848 switch.
We have an NEC 8100 VOIP switch plugged in to port 10 of our HP Procurve switch.  
Twice a day, at random, the phones go down and immediately come back up within 5 minutes.  Nothing else (computers, printers, Access Points, etc.) plugged in to the HP Procurve goes down; so, we're assuming we've got a VOIP switch problem INSTEAD of a "network" issue since nothing else is going down.
As our initial stab at fixing the issue, NEC tech support wants me to enable "port fast" on the port that the VOIP switch is plugged in to.
I see no way in the GUI interface to the HP Procurve to do this.
Is there a CLI command that enables this function?  If so, can anyone provide me the EXACT syntax for enabling this feature for port 10 of the HP Procurve switch?
0
We have a about 10 C5K125-24P2 Enterasys / Extreme switches.  I see that they have reached end of sale but how do I find when they reach end of life. I wen to the website and downloaded the spreadsheet but I do not see end of life for the switches.
0
hi guys

Is there a difference between meraki switches and a Cisco layer 3 switch that is not meraki?

Thanks
Yash
0
Dell N3048P's switch connected route disappears and re-appears, causing intermittent issue.


 * Indicates the best (lowest metric) route for the subnet.

Default Gateway is x.x.x.x
S      *0.0.0.0/0 [1/0] via x.x.x.x,   21h:51m:28s,  Vl100
C      *x.x.x.0/24 [0/0] directly connected,   Vl100  -----------> this disappears and re-appears every minutes or so. When it disappears, it can't talk to certain resources.

I checked the switch and uplink ports and don't see any errors or misconfiguration.  Nothing int he log too.

thx!
0
I have my internet connection extended to a portion of my house using powerline extenders. I would like to extend my internet to another area of my house but it's not on the same circuit and my router. How can this be done?
0
I have a Ruckus ICX 7250 24 port switch with 8 Licensed 10 GB SFP+ ports and I will be getting a Dell EMC ME4024 Storage Array with 8 Port Dual Controller for iSCSI SFP+. I would like to know how to configure it on the switch and how to best use it with vmware vsphere 6.5.

Any help would be greatly appreciated as I've never had to configure one from scratch.

Thank you
0
Hi we can ping a switch, but cannot ssh it. When we access it with ssh, it looks like there is not any connection between us and the switch. What is causing it? Thank you
0
Connecting Cisco Switches to a Router

I just want to make sure  the connection and ports configuration type is correct:

in the case we have Cisco Layer 3 Switches configured with VLANs and SVIs, we have  Computers that are connected to the L3 Switches.
If I need the traffic on all L3 switches to be routed to a different Network, then I will have to bring an L2 switch and connected the uplink ports from all L3 switches to the ports on L2 Switch then bring a router  and connect an uplink port from L2 switch to a Router.
the Uplink ports that connect  L3 to  L2  switches will be configured as Trunk Ports and the ports that connect L2 Swicth to the router will be configured as  Trunk Ports.

Correct me if I am wrong

Thank you
0
Just curious if any one knows what a good Open OS Switches to use for education or enterprises? Just wondering what the trends is and/or the leader is.

Thank you in advance!
0
how to create lacp on 2 port (sag 23 and 24) on procurve 2810 from command line
0
I manage a series of servers, but do not control the building infrastructure. I wanted to multihome one of our servers (two NICs with two different IP addresses) where both of the NICs are plugged into the same switch/router (managed by the building infrastructure team.)

I was told by the building infrastructure team that this would not work for "reasons." They did say teaming two ports on the router so they shared a single IP address with both NICs was possible.

But I can't really get any technical information out of them beyond this.

Can some one direct me to a technical reason why the above situation is happening - so I can just Google it and try to understand?
0

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.

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