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Vlan dear sir, i want to know detailed about VLAN. what is is? and how it it possible on switch only or router only.......i am very confused........waiting for u r id is

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Hi JackHeath
I find this information to be of grate value to me, I have one more question how can I set up a VLAN on a TRT Cat 5e patch panel

Posted on Nov 13, 2008

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A VLAN is a Virtual LAN. It allows the same physical piece of equipment to manage traffic for two separate networks but still block the movement of data between them as if they were not on the same. Picture it like partitioning a hard drive, but your dividing the ports on your switch. As for why, there are a couple reasons. (1) Reducing LAN traffic, every packet sent by a computer has to cycle through every manchine on the LAN, VLAN's limit the number of machines a packet routes through, (2) Security, it also allows you to limit data to a subset of devices or computers. (3) and it allows you to organize your machine on a large LAN by address.

Here are case examples:

1) I want to setup quality of service making sure that servers or phone systems are allotted a certain amount of priority at all times. For example, you wouldn't want your phones to crack and pop because Joe in accounting decided to stream the latest episode of CSI Miami.
2) I want to organize the machines in my organization for security purposes breaking apart different physical networks for each department, building, etc. If you have multinational company running on the same LAN, you don't want everyone pulling from a single pool of addresses.
3) I have a limited amount of equiment so purchase on large switch rather then several smaller ones and divide the ports into specified port groups. I can then set different port restrictions, policies, and quality of service for each group...say an IP phone system, a DMZ, a lab, and management PC's.

Posted on Oct 06, 2008


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Can anybody know why the S2700 switch cannot transparently transmit the packets whose VLANID is greater than 127 after VLAN translation is enabled?

After the VLAN translation function is enabled for the S2700 switch, the 128 module problem exists because the chip difference supports only 128 VLAN TO VLAN entries.
The packets received through the port are processed as the VLAN smaller than 128. The calculation method is (vlanid)%128.
Therefore, for a VLAN greater than 128, port vlan-mapping vlan id map-vlan id, that is, the mapping from the VLAN to the same VLAN, must be configured for the transparent transmission to be implemented.
Hope my answer can help you!

Dec 11, 2017 | The Computers & Internet

1 Answer

When I enable the vlan option in an EAP9550 I lose wireless access


Is the goal to use a different VLAN for each access point (AP)? If so then you will need to configure each NetGear port to use the same VLAN as the AP that is connected to it. You will then need either a switched virtual interface (SVI) for each VLAN on the NetGear or a trunk port (802.1q) from the NetGear to the Cisco. I'm not sure the NetGear will support SVIs but it will support trunks. An SVI basically creates a gateway for each VLAN's subnet. For example, let's say AP1 uses VLAN 10 and the subnet is while AP2 uses VLAN 20 with a subnet. The NetGear will need 2 SVIs, one for each VLAN/subnet. The first SVI for VLAN 10 can be configured with IP address while the second SVI can be configured with for VLAN 20. These IP addresses will be the gateway for each VLAN. Finally, the NetGear would need to act as a router and route each VLAN's subnet to the Cisco device. Once again I don't believe the FS726TP supports this.

The other solution would be to create a VLAN trunk port between the NetGear and the Cisco device but I believe the Cisco RV042 does not support trunking. If it does the trunk would be configured to carry all of the VLANs to the Cisco device which would then have SVIs created on it.

If neither of the above is possible you would need to use the same VLAN for each AP and each of the interfaces on the NetGear and Cisco devices which negates the need for the VLANs.

I hope this helps.

Mar 13, 2014 | EnGenius Computers & Internet

1 Answer

Difference between VLANs and subnetting?

VLAN- Essentially, you are separating a network into different broadcast domains with a switch by moving some ports on a switch into a separate VLAN other than the default, 1. Switch ports in VLAN X will communicate with any other ports on the network also in VLAN X, but not any other VLAN, unless you so configure it that way.

Subnetting- Subnetting is the breaking up of a chunk of IP addresses into different networks. These subnetworks are generally assigned to each LAN on that network, which all connect to a router, which may connect to the cloud through the ISP, or to another router on the network, or separate network. The addresses on that subnet are assigned to clients on the LAN the subnet is assigned to.

Nov 12, 2013 | Computers & Internet

1 Answer

Sir I have 4200 series 26 ports Switch i want to Configure intra VLAN But I am Getting a problem to Configure that switch . After Cnfigure VLAN on Consol prompt. I am not accessing to my Server & WAN...

If you are creating only Layer 2 VLANs on the switch , you wont be able to ping the servers and Routers as they are in default VLAN1.
you can do the below steps
1. Create sub interfaces on the router LAN interface
2. Provide a new ip range to the new sub interface
3. Make the switch port connecting router as trunk, so that it will carry both the VLAN info
4. on your Labtop/PC give the IP address in the newly defined range
5. Make your switch port to be in the new VLAN

This will work , if you wont be able to configure the above settings, let me know i will give you the detailed config

Nov 01, 2010 | 3Com 4500 24-Port Ethernet Switch

1 Answer

I need to use the switch ports (WIC-4ESW) with my 1711 router it has 1 real lrouted Fast Ethernet and a 4 port 10/100 switch tht is only L@, someone how i have to make VLANS or virtual interfaces, if...

to make a VLAN you would need to log on to the router, get to config mode, and then type vlan [vlan number] name [text name for vlan] and press enter. This creates the vlan in the vlan database (vlan.dat in flash).

Once you have done this, create the actual vlan interface by typing int vlan x and pressing enter, and then configure this like a normal interface with an ip address, etc (don't forget to no shut the interface!).

You can then either assign the vlan to the interface by going to the interface with int [interface name and number] and pressing enter, then use the switchport mode access command to set it to an access port, and then switchport access vlan x to set the access to the relevant vlan.

Of course, substitute the x's in my examples for the relevant vlan numbers.

Hope that this is of some help.

Jun 13, 2009 | Cisco 1711 Security Access Router...

1 Answer

Setting up an hp 7102dl router

You need a switch.

Refer to this for more info:

Not spam.

Apr 08, 2009 | HP Computers & Internet

1 Answer

ZyXEL IES-1000 with AAM1212 ADSL 12 port module step-by-step guid

Going through the GUI would take too long, so use CLI to add the commands below. After that, check the GUI and see how those changes appear.

On all equipment use 802.1q tagging. The example below puts adsl ports 1 to 10 in vlan10 and ports 11-12 in vlan2. These vlans are 802.1q tagged on the ethernet ports.

switch vlan set 1 1~12:X enet1~enet2:FT DEFAULT
switch vlan set 2 1~10:X 11~12:FU enet1~enet2:FT VLAN2
switch vlan set 10 1~10:FU 11~12:X enet1~enet2:FT VLAN10
switch vlan set 17 1~12:X enet1~enet2:FT VLAN17
switch vlan pvid 1~10 10
switch vlan pvid 11~12 2
switch vlan pvid enet1~enet2 1
switch vlan priority * 0
switch vlan gvrp * disable
switch vlan frametype * all
switch vlan cpu set 1

ATM circuit:
Each port requires one or more VPI/VCI circuit. You could map different circuits to corresponding vlans. The config below creates a primary circuit 1/35 on each port. On ports 5 and 9 is another circuit 1/32 mapped to vlan10

adsl pvc set * 1 35 super DEFVAL
adsl pvc set 5,9 1 32 10 0 DEFVAL

Remember a dslam is just a switch, bridging packets from a VC onto a VLAN or straight onto ethernet.

Mar 27, 2009 | Zyxel IP Express IES-1000 (91004098002)

2 Answers

Sending DHCP request across diffrent vlans

Hmm... on your DHCP server, try setting the "default router" IP for each pool to be the VLAN ID on the switch.

scope /24

scope /22

I think the DHCP replies aren't going back where they should. I've never done this without a router doing all the DHCP, but it does work and i've done it many times. Your config looks spot on for the switch.

Feb 01, 2009 | Cisco Catalyst 3750E-48PD

1 Answer

Can we able to trunk one vlan to another vlan

interface GigabitEthernet0/1
switchport access vlan X
interface GigabitEthernet0/2
switchport access vlan Y
interface GigabitEthernet0/3
description trunk port
switchport mode trunk
switchport trunk allowed vlan X,Y

Aug 19, 2008 | Trendware 8PORT SMART POE SWITCH SNMP VLAN...

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