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,

I have a Cisco SG200 Switch and a Sonicwall TZ400.  I need to isolate 9 networks from each other. Each network has its own DHCP.

Here's my config:

VLAN1 192.168.2.0
VLAN2 192.168.1.0
VLAN10 192.168.10.0
VLAN20 192.168.20.0
VLAN30 192.168.30.0
VLAN40 192.168.40.0
VLAN50 192.168.50.0
VLAN60 192.168.60.0
VLAN70 192.168.70.0

Sonicwall interfaces
Sonicwall DHCP
 I've read and followed the instructions on setting up VLAN on the CG200 but maybe I'm missing something or maybe I'm missing that magical matching combination of correct settings and a router/switch reboot at the right time.  I've checked with Sonicwall and they say that I have everything configured right on the TZ400.  They say that my SG200 is not properly tagging the traffic going to the Sonicwall is not seeing the tag so it's not going to the proper VLAN.  Here's a screenshot of my Port VLAN Membership:

cg200 port vlan membership
I've spent hours trying to get this figured out and it feels like I've hit a wall now.  Any help is greatly appreciated!
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Hi,

I am trying to setup VSS and VLAN in Cisco 6807. I followed the steps in the link

https://www.youtube.com/watch?v=LVYcdgaLeeQ

I have questions (Any help will be appreciated)
- This steps must be done in one of the switches. Is that correct?
- I have 9300 switches that need to be connected to 6807 switch. I must connect two physical fiber connection one from each switch  (6807) to (9300 switches). Is that correct?
- I want to configure 10 VLAN's (192.168.0.0, 192.168.1.0,......192.168.10.0) with VTP domain in the (6807) switch ( I will need to assign IP address for each VLAN and create Management VLAN). How I can do that?
- I will change all the port that connect the 9300 and 6807 switch to trunk mode and use encapsulation Dot1Q.
- DHCP server (Multi scopes) address is 192.168.0.100. So, I will need to configure IP helper address under each VLAN.
- Port 10 of Cisco (6807)  in switch 1 are connected inner interface of ASA [IP address 192.168.0.1 and outer (public IP address 85.X.X.X)]. I need to be able to connect all VLAN's to be able to connect to internet and can see each other. How I can configure that?


Switch6807-1(config)#switch virtual domain 6
Switch6807-1(config-vs-domain)# switch 1
Switch6807-1(config-vs-domain)# switch 1 priority 110
Switch6807-1(config-vs-domain)# switch 2 priority 100
Switch6807-1(config)# interface port-channel 1
Switch6807-1(config-if)# no shutdown
Switch6807-1(config-if)# description VSL to switch 2

Open in new window

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Hi,

Please, I am not an expert and I need help. I am planning to buy core switch and I have questions. Can Cisco C6807-XL be stacked? Do I need to buy stack power and data cable only? or I have to buy modular to achieve stack? if yes what modular I need to buy?

These are the specifications that I have for the core switch


C6807-XL      Catalyst 6807-XL 7-slot chassis, 10RU
CON-SNT-C6807XLC      SNTC-8X5XNBD Catalyst 6807-XL 7-s
C6800-OTHER      Catalyst 6800 Other PIN; For Tracking Only
C6807-XL-FAN      Catalyst  6807-XL Chassis Fan Tray
C6800-XL-CVR      Catalyst 6807-XL line card slot cover
C6800-PS-CVR      Catalyst 6800 power supply blank cover
C6800-DNA-OPTOUT      DNA SUBSCRIPTION OPTOUT
VS-S2T-10G      Cat 6500 Sup 2T with 2 x 10GbE and 3 x 1GbE with MSFC5 PFC4
VS-F6K-PFC4      Cat 6k 80G Sys Daughter Board Sup2T PFC4
MEM-C6K-INTFL1GB      Internal 1G Compact Flash
MEM-SUP2T-2GB      Catalyst 6500 2GB memory for Sup2T and Sup2TXL
VS-SUP2T-10G      Catalyst 6500 Supervisor Engine 2T Baseboard
S2TAIK9N-15501SY      Cisco CAT6000-VS-S2T IOS ADVANCED IP SERVICES NPE
C6800-48P-TX-XL      C6k 48-port 10/100/1000 GE Mod: fabric enabled, RJ-45 DFC4XL
C6800-48P-TX-XL      C6k 48-port 10/100/1000 GE Mod: fabric enabled, RJ-45 DFC4XL
C6800-48P-SFP-XL      C6k 48-port 1GE Mod:fabric-enabled with DFC4XL
GLC-SX-MMD      1000BASE-SX SFP transceiver module, MMF, 850nm, DOM
C6800-48P-SFP-XL      C6k 48-port 1GE Mod:fabric-enabled with DFC4XL
VS-S2T-10G      Cat 6500 Sup 2T with 2 x 10GbE and 3 x 1GbE with MSFC5 PFC4
VS-F6K-PFC4      Cat 6k 80G Sys …
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Hi One switch 3560 is connected to 4500 through two interfaces, which are bound as port-channel and as layer 2. Under the 3560, there are some PC and ip phone. so we use auto qos at each interface of 3560. Now we also need to configure auto qos voice trust on the port-channel. but 3560 port-channel does not support auto qos. How can we resolve the issue? Thank you
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I would like to be able to turn off the internet connections to wired computers. I was thinking of adding a managed switch next to my isps router and then using that to turn the ports on or off.

I am not sure what to buy tplink have l2 type with poe on 8 ports so might be good in the future. They have l2+ 16 port no poe managed switches at a reasonable price too. I would also like to give my computer full bandwith when I teach online, at present everyone affects it I think when I am in classes. Will a managed switch get me what I desire?

my choices seem to be TL-SG1016PE or
TP-Link Switch T2600G-18TS(TL-SG3216) 16x1000/2xSFP L2 Managed

I also would like a better wifi access point I think my tplink wa901 is struggling.

advice would be welcome.
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I have a Cisco 3560 L2/L3 that will be connecting to an HP 2910al access switch.

On the 3560, I have a few VLans set up. because of the amount of data going across the switches, I want to aggregate the link between the switches.  I have been looking for information on aggregating trunks and have not found much useful information. I find information on aggregating access ports all day  long.

Can someone assist with commands and examples.

Thanks,
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ARP and Proxy-ARP

I have been reading about ARP and Proxy-ARP , but could not get a good grasp of it.
If I understand when there is Layer3  between 2 hosts in different subnets, the router will take care of ARP Requests/Replies between the Hosts.
in some articles they call that Proxy-ARP when the L3 device is handling the ARP Request/Reply.
if that's true , then ARP is within the same subnet and Proxy-ARP between 2 subnets connected by L3 device ?

Thank you
0
I am a newbie at this. I assumed that all HP Procurve switched had a public snmp community but I guess not. I am trying to add one but must be missing something. Attached is what I need to supply but I can never seem to get it added. Any ideas?
Capture.PNG
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How Vmware Untagged Traffic is handled by Cisco switch

Sometimes in Vmware VM Port groups are not assigned to any Vlan or they have VLAN0, when the VM traffic gets to Cisco Switch how does the switch knows to where to send it.
Assuming VM1 is trying to communicate with VM2 and both are in default VLAN0

Thank you
0
Hi guys

I have an HP network 1820-48G J9981A switch. We have a 192.168.10.0/24 network range on this switch. It has been set with a 192.168.10.10 IP. Prior to this, our network switch was completely vanilla and had no IP configurations.

Now, majority of appliances plugged into this network are on the 192.168.10.0/24 range. However, we have 7-8 devices set to 192.168.9.0/24 range. So now, we are completely unable to get to anything on the 192.168.9.0/24 IP's, as the switch is currently only seeing the 192.168.10.0/24.

My question is, what's the best way now to configure this switch? I don't want to reset it to factory default as we won't have any management. So do I set up VLAN's on all ports? How would you do it?

Or, can I set routing on the switch to say anything on 192.168.9.0/24 network needs to be forwarded on to the 192.168.10.0 gateway?


Thanks for helping
Yash
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IP NAT Destination

Can someone give me an example  where we need to use Destination option in NAT

Example: IP NAT Inside/Outside Destination...

Thank you
0
Our customer has an HP VC Flex-10 10GB E-net module fail in interconnect bay 2 on his BladeSystem c-Class chassis and was sent a replacement.
The customer's modules have FW 4.45 and he wants the replacement to have the same firm.
We don't handle firmware issues in our small shop and I have no idea what's on the replacement sent to him.
How does he synchronize the FW on both modules if they do not match?
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hosting a Fortnite competition on ipads - what can i do to remove lagging/ latency issues

everyone will be on ipads and my bandwidth is 200 MB dedicated, its a small competition in our company, is there a QOS setting i can apply or any other suggestions

maybe there is a gaming port i need to open on the firewall
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Cisco 2960-x Switch configuration question. I have multiple Vlans setup on my switch. Is it possible to assign a separate IP address to each Vlan in the switch? If so what is the proper syntax?
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Loop Guard and Root Guard on Cisco Switches

I have done some reading about Loop Guard and Root Guard

Loop guard is configured on Non Designated Ports , which means Blocked ports and Root Ports

Root Guard is configured on Designated Ports.

 Well, I believe this is needed just  in a redundant L2 Links Network. in this case , do we have to go to each Non Designated Ports in the Network and configure Loop Guard and to each Designated Port and configure Root Guard ?


I am assuming in the Network that has no Layer 2 redundant links this is not needed at all, except on the Access ports where we need to configure Port Fast and BPDU Guards.

Any Expert to shade some lights on this topic?

Thanks
0
I have one DellS4148T switch and MXL force10 fabric switch . I need to configure both switch and also i need to enable lagging. For connectivity of both switches we are using 100GBE QSFP28 to QSFP28 passive copper. Please help me
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First Question.

Ages ago I had two switches given to me: a Cisco 2950 and a 3Com SuperStack 3 3C16592B.  And they've been sitting tossed aside for a long time.  I'm now in the process of decluttering and one has to go.  Which one and why?

Second Question

Now I'm a total noobie when it comes to these switches.  If I remove all passwords and take these machines back to factory or default they can be used as dumb switches, that is, I can plug anything into them and they'll function perfectly normally, getting their IP addresses from my home router?  I've just started playing with the Cisco and examining how it has been configured (shudder VLANs everywhere etc etc etc) so I'd like something simple to start off with before I venture into unknown areas.
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Hai Guys

We have one Dell switch S4148T and its have four 100GBE and two  40 GBe  SFP+ port.  Same like we have one dell chassis M100E.  It have two dell force10 MXL 10/40 GBE balde switch. we connect the cable from S4148T to force10 MXL blade switch and do the initial configuration. But still swicth ports are down ( both 100GBe and 40 GBe) . Any one can help me to resolve this issue. Can you share the configuration with me
1
BPDU Guard Role

If I understand BPDU Guard is configured on Edge Ports along with Portfast.
Reading this Cisco artcile:
https://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus5000/sw/configuration/guide/cli/CLIConfigurationGuide/SpanningEnhanced.html
It does not say the Portfast has to be configured for BPDU Guard to have effect.

It also states:
you can configure BPDU Guard at the interface level regardless of the typ of the configuration.. what I understand from that, you can even configure it if the interface is a Trunk.

Any Expert to shade some lights on this topic?

Thank you
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Spanning Tree Network Ports vs Normal Ports

In Cisco link :https://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus5000/sw/configuration/guide/cli/CLIConfigurationGuide/SpanningEnhanced.html
it talks about Network Ports and Normal Ports.
To me both sounds like Trunk Ports.

Any clarifications on that ?

Thank you
0
eth

How L2/L3 Etherchannel does Load-Balancing

Considering the diagram above ,  assuming that there are many PCs in 192.168.1.0/24 network and many PCs in 192.168.2.0/24 network
What is the best method to choose for load-balancing in this case (Source-Destination IP, Source Destination Mac,etc....) ?

another case is , Let's say in network 192.168.2.0/24 there are separate servers  that procide services to  PCs in the network 192.168.1.0/24
in this case what would be the best Load-Balancing Method ?

Thank you
0
Recently we bought a new firewall fortinet 100D to secure our company network.Our network is 192.168.101.0/24

now our network is flat network and we would like to implement VLAN also.

we have one unit Cisco 3750 switch ,now we already configure. firewall LAN port using 192.168.101.1/24 and connected to switch port directly and working without any issue.

question:
1.If we configure create the subinterface 10(Management),20(Server),30(Users),40(Wifi) and 200(Voice)what should i need to configure for the switch port connected to firewall ?
*All the traffic must visible in our firewall.

2.Our DHCP server is running inside the hyper-v and now the switch port i configure LACP with switch port mode access to allow VLAN 1 only.Do i need to configure to trunk and native VLANs ?if native VLANs is require which VLANs should i configure ?

3.How to migrate all my server to VLANs 10 without downtime ?

4.What is the purpose of management VLANs  i put it there just research online many people are design in this way.

5.How to configure the switch port which is user connected ?now all the user arw connect thier PCs via Cisco IP Phone ?
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Does Topology Change have impacts on the Network

I would llike to know when there is TCN in the Network whether this can impact End Users and Servers.

The reason for this question, is I believe that Switches do not perform in a timely manner, they can have delays because of CPU or Memory over usage..
So I wonder if TCN is normal behaviour or it can cause disruption in the network

Thank you
0
MST Revision number usage

I would like to know what is the usage of MST Revision number ?

Thank you
0
I have a unifi us-48 port switch
I have removed all connections to the switches and connected a pc and two servers to the switch.

Each server into the SFP+ ports
They can both ping the switch IP, the PC but not each other.

I have opened two command prompts on the PC and tried to ping each server in a different window.
If you get a reply from one server the other drops.
It looks like only one SFP+ port can be active at a time.

I need them both to be fully available on the network all the time.
Any ideas ?
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.