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Can someone help with VLANs?

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Latest post 11/13/2009 01:53 PM by bh1633. 2 replies.
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Joined on 11/04/2009
Posts: 2
Points 25

Can someone help with VLANs?

04 Nov 2009 07:38AM

Our network has 200+ devices on it right now but it's flat, well we have different subnets, but still using basic switches. At various points in the day we notice extreme congestion and some reliabilty problems. I want to create VLAN's so that traffic isn't broadcast across the whole network unnecessarily, and hopefully that will increase the performance and decrease the other problems we're having.

The only problem is that I don't know how to create the VLANs.  I managed to get the switch set up so that get to the web interface and I've been looking through the options but I'm stuck other than that. I understand that the VLANs need a trunk to pass information to each other and that without the trunk no other VLAN can communicate to it. So it might be best to explain the situation and then maybe someone can tell me what I need to do based on that.

I have 3 subnets: 192.168.0.x, 192.168.1.x, and 192.168.2.x

The servers, Zyxel VPN router, and a Windows box set to act as a router, and about 100 devices are on the 192.168.0.x subnet

About 70 devices are on 192.168.0.1 subnet and another 50 or so devices are on the 192.168.0.2 subnet

Everyone needs to communicate with the servers, some people have shared folders on their computers so I don't know if that will be an issue or not, and some of the servers have multiple NICs with an IP on each subnet and I'm certain that complicates things as well.

So, having said all that can someone help me?

  • Post Points: 5

2 Replies:

Joined on 11/04/2009
Posts: 2
Points 25

Re: Can someone help with VLANs?

12 Nov 2009 08:17AM

Ok so here's where I'm at, using two switches at the moment...I have VLANs set up on each switch. With VLAN10 on switch1 and VLAN20 on switch2 I can't get them to communicate back and forth. Here is the config from the switch. Keep in mind that I am working through the web interface, I only know very little command line. Please tell me what I'm doing wrong, and what I need to add/change/etc. Thanks.

 

!Current Configuration:
!System Description "PowerConnect 6248, 2.2.0.3, VxWorks5.5.1"
!System Software Version 2.2.0.3
!
configure
vlan database
vlan  10,20
vlan association subnet 192.168.0.0 255.255.255.0 10
vlan association subnet 192.168.1.0 255.255.255.0 20
exit
stack
member 1 2
exit
ip address 192.168.59.230 255.255.255.0
ip routing
interface vlan 10
name "VLAN10"
routing
ip address  192.168.0.230  255.255.255.0
ip netdirbcast
ip irdp
ip irdp address 255.255.255.255
no ip proxy-arp
ip mtu 1492
exit
interface vlan 20
name "VLAN20"
routing
ip address  192.168.1.230  255.255.255.0
ip netdirbcast
ip irdp
ip irdp address 255.255.255.255
no ip proxy-arp
ip mtu 1492
exit
username "administrator" password ec1776b4be44c51109a86021cc8d6c50 level 15 encr
ypted
!
interface ethernet 1/g1
switchport mode trunk
switchport trunk allowed vlan add 10,20
switchport trunk allowed vlan remove 1
exit

!
interface ethernet 1/g11
switchport access vlan 10
exit
exit

  • Post Points: 20
Joined on 04/02/2007
Posts: 578
Points 4,369

Re: Can someone help with VLANs?

13 Nov 2009 01:53PM

What does "I can't get them to communicate back and forth" mean?  Please explain.

In general, you should have one switch set up as a router and the other as a switch.   The clients on the vlan 10 lan, should have the router's vlan 10 ip address as the default gateway.   The clients on the vlan 20 lan should have the router's vlan 20 ip address as the default gateway.

If you are still having problems:

- post the config of the other switch

- tell how the two switches are connected

- post the out of the DOS commands "ipconfig" and "route print" from one the clients and tell us which port it is connected to.

 

 

 

 

  • Post Points: 5
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